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\n \n\n \n \n \n \n \n \n Scale-Bridging Solid Adsorbents for Direct Air Capture: Integrating Material Chemistry, Structured Contactors, and Advanced Regeneration Processes.\n \n \n \n \n\n\n \n Park, I.; Kim, S.; Hebisch, K. L; Park, I.; Lee, M.; and Koh, D.\n\n\n \n\n\n\n ChemRxiv, (0301). March 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"Scale-Bridging$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{park_scale-bridging_2026,\n\ttitle = {Scale-{Bridging} {Solid} {Adsorbents} for {Direct} {Air} {Capture}: {Integrating} {Material} {Chemistry}, {Structured} {Contactors}, and {Advanced} {Regeneration} {Processes}},\n\tshorttitle = {Scale-{Bridging} {Solid} {Adsorbents} for {Direct} {Air} {Capture}},\n\turl = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15000500/v1},\n\tdoi = {10.26434/chemrxiv.15000500/v1},\n\tabstract = {As the global carbon budget rapidly depletes, the transition to a sustainable, stable climate demands the urgent, gigaton-scale deployment of negative emission technologies. Direct air capture (DAC) has emerged as an essential, emissions source independent pathway toward global net-zero targets. Compared to solvent-based systems, solid adsorbent-based DAC holds distinct advantages due to its broader material versatility, modular scalability, and streamlined equipment architecture. However, transitioning from laboratory-scale material discovery to commercial deployment requires a holistic, system-level engineering approach. Because intrinsic adsorbent properties dictate the design of scalable structured contactors, the selection of energy-efficient regeneration methods, and the ultimate techno-economic and environmental viability of the process, these interdependent components must be synergistically co-optimized. To address this co-optimization challenge, this review provides a critical, integrated evaluation of solid adsorbent DAC. By systematically analyzing recent advancements across adsorbent development, structured contactor engineering, regeneration strategies, and system-level assessments, we outline a strategic roadmap to accelerate the development of commercially viable solid adsorbent DAC technologies.},\n\tnumber = {0301},\n\turldate = {2026-03-02},\n\tjournal = {ChemRxiv},\n\tpublisher = {ChemRxiv},\n\tauthor = {Park, Injun and Kim, Sieun and Hebisch, Karoline L and Park, Inhwan and Lee, Minhyung and Koh, Dong-Yeun},\n\tmonth = mar,\n\tyear = {2026},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Interface Engineering of Cu/CeO2–Al2O3 for Mixed-Oxide Interface-Driven Associative CO2 Activation in RWGS.\n \n \n \n \n\n\n \n Heo, H.; Jang, J.; So, J.; and Koh, D.\n\n\n \n\n\n\n ACS Catalysis. February 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"Interface$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{heo_interface_2026,\n\ttitle = {Interface {Engineering} of {Cu}/{CeO2}–{Al2O3} for {Mixed}-{Oxide} {Interface}-{Driven} {Associative} {CO2} {Activation} in {RWGS}},\n\turl = {https://pubs.acs.org/doi/abs/10.1021/acscatal.6c00375},\n\tdoi = {10.1021/acscatal.6c00375},\n\tabstract = {Mixed-oxide catalysts show distinct catalytic behavior through crucial structural interactions among oxides and metals. While extensive research has focused on the individual roles of each oxide, the structural interactions in the mixed state and their role in catalytic mechanisms remain underexplored. To understand how mixed oxides alter catalytic behavior, we studied a suite of Cu-dispersed CeO2–Al2O3 catalysts in the reverse water gas shift (RWGS) reaction. Structural analyses revealed that beyond a certain ceria loading, further addition led to negligible nanostructural ceria evolution, marking the saturation of additional CeO2–Al2O3 interfacial structure formation and a corresponding plateau in catalytic performance. This finding indicates that catalytic activity is governed by the formation of CeO2–Al2O3 interfaces that stabilize active Cu species rather than by the total ceria loading. While ceria is well-known for its redox activity due to oxygen-vacancy properties, this study suggests that it also promotes the associative pathway through synergistic interactions with adjacent alumina domains, offering insights into reaction pathways in mixed-oxide catalysts. Overall, this study demonstrates that the CeO2–Al2O3 interface dictates both catalytic activity and mechanistic preference in the RWGS reaction, providing a design principle for developing interfacially engineered, mixed-oxide-supported catalysts for efficient CO2 conversion.},\n\turldate = {2026-02-25},\n\tjournal = {ACS Catalysis},\n\tpublisher = {American Chemical Society},\n\tauthor = {Heo, Huiryung and Jang, Jeong-Un and So, Jungseob and Koh, Dong-Yeun},\n\tmonth = feb,\n\tyear = {2026},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Solvent-Free Manufacturing of Electrified Structured Sorbents for Scalable Direct Air Capture.\n \n \n \n \n\n\n \n Park, I.; Kim, S.; Kim, J.; Hebisch, K. L; Park, I.; You, J.; Heo, H.; Jamal, A.; Kim, J.; and Koh, D.\n\n\n \n\n\n\n ChemRxiv, (0216). 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"Solvent-Free$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 6 downloads\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{park_solvent-free_2026,\n\ttitle = {Solvent-{Free} {Manufacturing} of {Electrified} {Structured} {Sorbents} for {Scalable} {Direct} {Air} {Capture}},\n\turl = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15000091/v1},\n\tdoi = {10.26434/chemrxiv.15000091/v1},\n\tabstract = {Direct air capture (DAC) of CO2 is an irreplaceable carbon removal technology, but its gigatonscale deployment requires the continuous manufacturing of highly efficient structured sorbent. Conventional solvent-based manufacturing fundamentally limits active material loading and imposes massive energy and environmental penalties, undermining the net-negative emissions goal of DAC. Here, we report a universal, solvent-free dry fabrication platform to continuously manufacture electrified structured sorbents with an unprecedented 97wt\\% active material loading. By exploiting the shear-induced fibrillation of polymer binders, we process diverse sorbent powders, including zeolites, mesoporous silicas, and metal-organic frameworks, into self-supporting flexible films. Lamination of these films onto conductive graphite creates an architecture capable of rapid, spatially homogeneous Joule heating. Assembled into a lowpressure-drop spiral-would module, an electrically driven temperature vacuum swing adsorption (e-TVSA) system delivers an exceptional volumetric productivity of 73.5 kgCO2/m 3 /day and maintains robust cyclic stability under realistic humid conditions. Supported by techno-economic analysis projecting a competitive levelized cost of \\$380 per tonne of CO2, this scalable, chemistry-agnostic manufacturing paradigm bridges the critical gap between bench-scale material discovery and industrially viable, gigaton-scale carbon removal.},\n\tnumber = {0216},\n\turldate = {2026-02-16},\n\tjournal = {ChemRxiv},\n\tpublisher = {ChemRxiv},\n\tauthor = {Park, Injun and Kim, Sieun and Kim, Junseong and Hebisch, Karoline L and Park, Inhwan and You, Juhyeong and Heo, Huiryung and Jamal, Aqil and Kim, Jinsu and Koh, Dong-Yeun},\n\tyear = {2026},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Sub-hour Rapid Cycling of Direct Air Capture Enabled by Engineered Hollow Fiber Sorbents.\n \n \n \n \n\n\n \n Park, I.; Kim, K.; Cheon, M.; Jeong, J.; Hebisch, K. L.; Realff, M. J.; Lively, R. P.; and Koh, D.\n\n\n \n\n\n\n ACS Sustainable Chemistry & Engineering. February 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"Sub-hour$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{park_sub-hour_2026,\n\ttitle = {Sub-hour {Rapid} {Cycling} of {Direct} {Air} {Capture} {Enabled} by {Engineered} {Hollow} {Fiber} {Sorbents}},\n\turl = {https://doi.org/10.1021/acssuschemeng.5c11415},\n\tdoi = {10.1021/acssuschemeng.5c11415},\n\tabstract = {Solid sorbent direct air capture (DAC) systems are influenced not only by the intrinsic CO2 uptake capacity of the sorbent but also by the efficiency of adsorption–desorption cycles, which governs the CO2 capture rate and thus the system productivity. As the system productivity is a key cost driver for DAC, minimizing cycle time through advanced sorbent design and the development of cyclic processes is essential for DAC systems. Here, a rapid temperature swing adsorption (RTSA) process for direct air capture was developed by integrating ethylenediamine-grafted Y zeolite hollow fiber sorbents with a direct contact thermal management strategy. A shell-side water barrier was formed via simple dip coating, enabling direct heat transfer from the fiber surface to the thermal fluid and allowing rapid temperature switching between adsorption at 10 °C and desorption at 90 °C. As a result, temperature transitions were completed within 1 min, and over 97\\% of the adsorbed CO2 was recovered in cyclic breakthrough experiments. Through Bayesian optimization (BO), the total cycle time was identified as a key variable affecting DAC productivity, and the present RTSA system experimentally demonstrated that sub-hour cycling maximizes CO2 throughput. This integration of structured sorbent design and process optimization provides a practical framework for realizing highly efficient DAC technologies under realistic operating conditions.},\n\turldate = {2026-02-12},\n\tjournal = {ACS Sustainable Chemistry \\& Engineering},\n\tpublisher = {American Chemical Society},\n\tauthor = {Park, Injun and Kim, Kyunam and Cheon, Mujin and Jeong, Jinhong and Hebisch, Karoline L. and Realff, Matthew J. and Lively, Ryan P. and Koh, Dong-Yeun},\n\tmonth = feb,\n\tyear = {2026},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n A Scalable and Cost-Effective Zeolite-Polymer Fiber Sorbent Enabled by Vapor-Induced Cu(I) Activation for Selective Acetylene Capture.\n \n \n \n \n\n\n \n Lee, S.; So, J.; Kim, H.; Heo, H.; Lee, J. W.; and Koh, D.\n\n\n \n\n\n\n ACS Applied Materials & Interfaces. January 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"A$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{lee_scalable_2026,\n\ttitle = {A {Scalable} and {Cost}-{Effective} {Zeolite}-{Polymer} {Fiber} {Sorbent} {Enabled} by {Vapor}-{Induced} {Cu}({I}) {Activation} for {Selective} {Acetylene} {Capture}},\n\tissn = {1944-8244},\n\turl = {https://doi.org/10.1021/acsami.5c21142},\n\tdoi = {10.1021/acsami.5c21142},\n\tabstract = {Identifying appropriate materials that can simultaneously ensure low production costs, scalability, and retention of intrinsic adsorption capabilities throughout the structuring process remains a significant challenge, thereby limiting the industrial implementation of adsorptive gas separation techniques. We report the first example of the structured fiber sorbents incorporating CuI-exchanged Y zeolites (CuI@Y), which can form CuI-alkyne π-complexes for the selective adsorption of acetylene from C2H2/CO2 mixtures. CuI@Y/PVDF fiber sorbents exhibited remarkable adsorption performance, including high C2H2 uptake at low partial pressure (0.775 mmol·g–1 at 10 mbar C2H2) and high IAST selectivity (11.7), even after the structuring process. The separation performance was also confirmed by the dynamic breakthrough experiments at 25 °C, demonstrating a separation factor of approximately 3.12 for a ternary C2H2/CO2/He (10/5/85, v/v/v) mixture along with excellent cyclic stability over multiple separation cycles. Notably, CuI@Y/PVDF fiber sorbents can be readily fabricated and scaled up using commercially available raw materials, with an estimated production cost of \\$26 per kilogram. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analyses further supported the presence of CuI–alkyne interactions, revealing distinct binding affinities for C2H2 and CO2.},\n\turldate = {2026-01-25},\n\tjournal = {ACS Applied Materials \\& Interfaces},\n\tpublisher = {American Chemical Society},\n\tauthor = {Lee, Sunggyu and So, Jungseob and Kim, Hyunjung and Heo, Huiryung and Lee, Jae W. and Koh, Dong-Yeun},\n\tmonth = jan,\n\tyear = {2026},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Dehydration of Ethylene Glycol Using Sodium-Mediated Hydrophilic Carbon Molecular Sieve Membranes.\n \n \n \n \n\n\n \n Oh, B.; Kwon, Y.; Hwang, Y.; Park, Y.; Nam, S.; and Koh, D.\n\n\n \n\n\n\n Industrial & Engineering Chemistry Research. January 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"Dehydration$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{oh_dehydration_2026,\n\ttitle = {Dehydration of {Ethylene} {Glycol} {Using} {Sodium}-{Mediated} {Hydrophilic} {Carbon} {Molecular} {Sieve} {Membranes}},\n\tissn = {0888-5885},\n\turl = {https://doi.org/10.1021/acs.iecr.5c04385},\n\tdoi = {10.1021/acs.iecr.5c04385},\n\tabstract = {Organic solvents play a crucial role in the pharmaceutical and chemical industries, making dehydration processes essential for an environmentally friendly process design and compliance with environmental regulations. Ethylene glycol, as a valuable raw material, is gaining attention for regeneration through dehydration processes from the perspective of resource recycling. In this study, sodium was introduced through functional group substitution of precursor PIM-1, enhancing the hydrophilicity of the carbon molecular sieve (CMS) membrane for applications in ethylene glycol (EG)/water dehydration processes. Na-PIM, synthesized through nitrile group substitution of PIM-1 via hydrolysis, was confirmed by spectroscopic analysis. The pyrolyzed Na-PIM CMS revealed improved hydrophilic characteristics compared to PIM-1 CMS, demonstrating over 70\\% higher water permeability in dehydration experiments without a loss in the separation factor. This research successfully developed a hydrophilic CMS through precursor functional group substitution, proposing a method to enhance the applicability of carbon membranes, which are challenging in dehydration processes due to hydrophobicity.},\n\turldate = {2026-01-25},\n\tjournal = {Industrial \\& Engineering Chemistry Research},\n\tpublisher = {American Chemical Society},\n\tauthor = {Oh, Banseok and Kwon, YongSung and Hwang, Young-Eun and Park, You-In and Nam, Seung-Eun and Koh, Dong-Yeun},\n\tmonth = jan,\n\tyear = {2026},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Directing Ultramicropore Architecture in Carbon Molecular Sieve Membranes with Lanthanum for High-Fidelity Gas Separation.\n \n \n \n \n\n\n \n Seo, H.; Kwon, Y. S.; Jang, M.; Heo, H.; Jang, J.; Oh, B.; and Koh, D.\n\n\n \n\n\n\n Small, n/a(n/a): e09715. 2026.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/smll.202509715\n\n\n\n
\n\n\n\n \n \n $\"Directing$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{seo_directing_2026,\n\ttitle = {Directing {Ultramicropore} {Architecture} in {Carbon} {Molecular} {Sieve} {Membranes} with {Lanthanum} for {High}-{Fidelity} {Gas} {Separation}},\n\tvolume = {n/a},\n\tcopyright = {© 2026 Wiley-VCH GmbH},\n\tissn = {1613-6829},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.202509715},\n\tdoi = {10.1002/smll.202509715},\n\tabstract = {A crucial performance ceiling has long limited carbon molecular sieve (CMS) membranes in demanding gas separations, a limitation stemming directly from the inability to precisely dictate their ultramicroporous architecture. Herein, we demonstrate a novel lanthanum (La)-doping strategy to precisely control the structural evolution of polyimide-based carbon CMS membranes. Lanthanum incorporation fundamentally alters pyrolysis dynamics by significantly increasing aromatic strand mobility and enabling La complexes to serve as nanoscale Langmuir templates. This entropic-driven templating effect guides the alignment of carbon strands and optimizes their narrow arrangement, resulting in a markedly narrow pore size distribution for precise gas separation. La-doped CMS membranes exhibit exceptional molecular sieving capabilities, notably, achieving 100-fold increase in H2/CH4 selectivity while maintaining high H2 permeability. Even under realistic operating conditions involving variations in pressure, feed composition, and temperature, the La-doped CMS membranes retained their high H2 permeability and selectivity, showing minimal sensitivity to feed composition and pressure and excellent resistance to physical aging. This straightforward, versatile, and scalable metal-doping approach presents a significant advancement for developing high-performance CMS membranes, opening new opportunities for challenging industrial gas separations that require precise differentiation of molecules with similar kinetic diameters.},\n\tlanguage = {en},\n\tnumber = {n/a},\n\turldate = {2026-01-19},\n\tjournal = {Small},\n\tauthor = {Seo, Hyeokjun and Kwon, Yong Sung and Jang, Min-Jun and Heo, Huiryung and Jang, Jeong-Un and Oh, Banseok and Koh, Dong-Yeun},\n\tyear = {2026},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/smll.202509715},\n\tkeywords = {carbon molecular sieve, entropically favorable pore tuning, gas separations, metal-involved pyrolysis},\n\tpages = {e09715},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n AIM: A user-friendly GUI workflow program for isotherm fitting, mixture prediction, isosteric heat of adsorption estimation, and breakthrough simulation.\n \n \n \n \n\n\n \n Hassan, M.; Yoon, S.; Chen, Y.; Kim, P.; Yun, H.; Kwon, H. T.; Bae, Y.; Yoo, C.; Koh, D.; Hong, C. S.; Lee, K. B.; and Chung, Y. G.\n\n\n \n\n\n\n Computer Physics Communications, 319: 109944. February 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"AIM:$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{hassan_aim_2026,\n\ttitle = {{AIM}: {A} user-friendly {GUI} workflow program for isotherm fitting, mixture prediction, isosteric heat of adsorption estimation, and breakthrough simulation},\n\tvolume = {319},\n\tissn = {0010-4655},\n\tshorttitle = {{AIM}},\n\turl = {https://www.sciencedirect.com/science/article/pii/S001046552500445X},\n\tdoi = {10.1016/j.cpc.2025.109944},\n\tabstract = {Adsorption breakthrough modeling often requires complex software environments and scripting, limiting accessibility for many practitioners. We present AIM, a MATLAB-based graphical user interface (GUI) application that streamlines fixed-bed adsorption modeling and analysis through an integrated workflow, which includes isotherm fitting, enthalpy of adsorption estimation, mixture prediction, and multicomponent breakthrough simulations. AIM supports 13 isotherm models for isotherm fitting and includes Ideal Adsorbed Solution Theory (IAST) implementation (FastIAS) and extended Langmuir models for mixture isotherm predictions. Moreover, the isotherm models can be used to run non-isothermal breakthrough simulations along with isosteric enthalpies of adsorption from the Clausius-Clapeyron and Virial equations. Users can export detailed column and outlet profiles (e.g., composition, temperature) in multiple formats, enhancing reproducibility and data sharing among practitioners. We compared the breakthrough simulation results from AIM workflow with the experimental data in the literature for ternary gas mixture (CO2/H2/N2) and found excellent agreement for outlet compositions and temperature profiles.},\n\turldate = {2026-01-19},\n\tjournal = {Computer Physics Communications},\n\tauthor = {Hassan, Muhammad and Yoon, Sunghyun and Chen, Yu and Kim, Pilseok and Yun, Hongryeol and Kwon, Hyuk Taek and Bae, Youn-Sang and Yoo, Chung-Yul and Koh, Dong-Yeun and Hong, Chang Seop and Lee, Ki Bong and Chung, Yongchul G.},\n\tmonth = feb,\n\tyear = {2026},\n\tkeywords = {Adsorption isotherm fitting, Fixed-bed adsorption breakthrough modelling mixture isotherm prediction, Open-source gui software},\n\tpages = {109944},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Overcoming water co-transport in PIM-1/PVDF composite membranes for sustainable ammonia recovery from wastewater.\n \n \n \n \n\n\n \n Park, J.; Park, J.; Hwang, Y.; and Koh, D.\n\n\n \n\n\n\n Separation and Purification Technology, 387: 136673. April 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"Overcoming$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{park_overcoming_2026,\n\ttitle = {Overcoming water co-transport in {PIM}-1/{PVDF} composite membranes for sustainable ammonia recovery from wastewater},\n\tvolume = {387},\n\tissn = {1383-5866},\n\turl = {https://www.sciencedirect.com/science/article/pii/S1383586625052700},\n\tdoi = {10.1016/j.seppur.2025.136673},\n\tabstract = {Ammonia contamination in industrial wastewater poses significant environmental challenges due to its toxicity and strict regulatory constraints. Although membrane contactors using nonselective membranes are widely used for ammonia recovery via liquid-liquid extraction, where an acidic extractant flows on the opposite side of the membrane, unintended water cotransport imposes a burden on overall treatment efficiency. To overcome this limitation, we propose a novel approach using PIM-1/PVDF thin film composite hollow fiber membranes that enable selective ammonia permeation while effectively rejecting water. A dense PIM-1 layer coated on the PVDF support shifts the transport mechanism from pore-flow model to solution–diffusion model, effectively suppressing water vapor transport due to its hydrophobic nature. Membrane performance was evaluated under both liquid-vacuum and liquid-liquid (with aqueous phosphoric acid as extractant) operational modes using simulated ammonia wastewater at varying temperatures and concentrations. Both modes exhibited similar trends in water and ammonia permeate fluxes, however, the liquid-liquid mode consistently demonstrated higher ammonia flux and lower water flux across all studied process conditions. Long-term operational stability was further validated by reaching a concentration-based ammonia removal efficiency of 95.4 \\% with dramatically reduced water loss of less than 17 \\%. The thin film composite hollow fiber membranes demonstrated a 4.2-fold higher separation factor compared to porous membranes, offering a material-driven solution to water cotransport issues in conventional membrane contactors for more sustainable wastewater treatment.},\n\turldate = {2026-01-19},\n\tjournal = {Separation and Purification Technology},\n\tauthor = {Park, Jimin and Park, Joon-Hyun and Hwang, Young-Eun and Koh, Dong-Yeun},\n\tmonth = apr,\n\tyear = {2026},\n\tkeywords = {Ammonia, Hollow Fiber membrane, PIM-1, PVDF, Thin film composite membrane},\n\tpages = {136673},\n}\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Additive manufacturing of architected Ca(OH)2 monoliths for accelerated CO2 mineralization.\n \n \n \n \n\n\n \n Park, I.; Kim, S.; Jeon, B.; Heo, H.; Choi, S. Q.; Lee, J. H.; and Koh, D.\n\n\n \n\n\n\n Carbon Capture Science & Technology, 18: 100568. March 2026.\n \n\n\n\n
\n\n\n\n \n \n $\"Additive$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{park_additive_2026,\n\ttitle = {Additive manufacturing of architected {Ca}({OH})2 monoliths for accelerated {CO2} mineralization},\n\tvolume = {18},\n\tissn = {2772-6568},\n\turl = {https://www.sciencedirect.com/science/article/pii/S2772656826000011},\n\tdoi = {10.1016/j.ccst.2026.100568},\n\tabstract = {Effective CCU technologies demand robust, scalable sorbents with high CO2 selectivity and capacity. While calcium hydroxide (Ca(OH)2) offers high CO2 uptake via mineral carbonation, its practical application is hindered by slow reaction kinetics and difficulties in forming mechanically stable, structured beds. Here, we report a direct ink writing (DIW) approach to fabricate 3D-printed Ca(OH)2 monoliths using water-based inks formulated with carboxymethyl cellulose (CMC). Under humid conditions (RH95, 1–10 mol \\% CO2), the monolith achieves {\\textgreater}99 \\% conversion to calcium carbonate, with similarly strong performance maintained at 400 ppm CO2 relevant to direct air capture (DAC). The structured sorbent also exhibits extremely low pressure drop (∼2 Pa/cm), making it suitable for scaled-up applications. A techno-economic analysis (TEA) for the DAC case, incorporating parallel nozzle printing, shows that the levelized cost of capture (LCOC) can be reduced to 339 US\\$/tCO2, with break-even scenarios attainable through carbon subsidies or high-value reuse of the monolith reuse. Overall, this work establishes a dry, scalable pathway for fabricating reactive structured Ca(OH)2 sorbents for CCU applications.},\n\turldate = {2026-01-19},\n\tjournal = {Carbon Capture Science \\& Technology},\n\tauthor = {Park, Injun and Kim, Sunwoo and Jeon, Byeongju and Heo, Huiryung and Choi, Siyoung Q. and Lee, Jay H. and Koh, Dong-Yeun},\n\tmonth = mar,\n\tyear = {2026},\n\tkeywords = {3D-printing, CO mineralization, Direct air capture, Direct ink writing, Structured sorbent},\n\tpages = {100568},\n}\n

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\n \n\n \n \n \n \n \n \n BOOST: Bayesian Optimization with Optimal Kernel and Acquisition Function Selection Technique.\n \n \n \n \n\n\n \n Park, J.; Cheon, M.; Wi, J.; and Koh, D.\n\n\n \n\n\n\n . September 2025.\n arXiv:2508.02332 [cs]\n\n\n\n
\n\n\n\n \n \n $\"BOOST:$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n\n\n\n

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@article{park_boost_2025,\n\ttitle = {{BOOST}: {Bayesian} {Optimization} with {Optimal} {Kernel} and {Acquisition} {Function} {Selection} {Technique}},\n\tshorttitle = {{BOOST}},\n\turl = {http://arxiv.org/abs/2508.02332},\n\tdoi = {10.48550/arXiv.2508.02332},\n\tabstract = {The performance of Bayesian optimization (BO), a highly sample-efficient method for expensive black-box problems, is critically governed by the selection of its hyperparameters, including the kernel and acquisition functions. This presents a significant practical challenge: an inappropriate combination can lead to poor performance and wasted evaluations. While individual improvements to kernel functions (e.g., tree-based kernels, deep kernel learning) and acquisition functions (e.g., multi-step lookahead, tree-based planning) have been actively explored, the joint and autonomous selection of the best pair has been largely overlooked, forcing practitioners to rely on heuristics or costly manual tuning. We propose BOOST (Bayesian Optimization with Optimal Kernel and Acquisition Function Selection Technique), a novel framework that automates this selection. BOOST utilizes a lightweight, offline evaluation stage to predict the performance of various kernel-acquisition pairs and identify the most promising pair before committing to expensive evaluations. Using K-means clustering, BOOST first selects initial subsets from previously observed data-in-hand and prepares all possible kernel-acquisition pairs from user-chosen candidates. For each pair, BOOST conducts internal BO runs starting with the initial subset, evaluating how many iterations are required to find the target value within the remaining data, thereby identifying the pair with the best retrospective performance for future optimization. Experiments on synthetic benchmarks and real-world hyperparameter optimization tasks demonstrate that BOOST consistently outperforms standard BO with fixed hyperparameters and state-of-the-art adaptive methods, highlighting its effectiveness and robustness in diverse problem landscapes.},\n\turldate = {2026-01-19},\n\tpublisher = {arXiv},\n\tauthor = {Park, Joon-Hyun and Cheon, Mujin and Wi, Jeongsu and Koh, Dong-Yeun},\n\tmonth = sep,\n\tyear = {2025},\n\tnote = {arXiv:2508.02332 [cs]},\n\tkeywords = {Computer Science - Machine Learning, Statistics - Machine Learning},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n EARL-BO: Reinforcement Learning for Multi-Step Lookahead, High-Dimensional Bayesian Optimization.\n \n \n \n \n\n\n \n Cheon, M.; Lee, J. H.; Koh, D.; and Tsay, C.\n\n\n \n\n\n\n . July 2025.\n arXiv:2411.00171 [cs]\n\n\n\n
\n\n\n\n \n \n $\"EARL-BO:$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n\n\n\n

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@article{cheon_earl-bo_2025,\n\ttitle = {{EARL}-{BO}: {Reinforcement} {Learning} for {Multi}-{Step} {Lookahead}, {High}-{Dimensional} {Bayesian} {Optimization}},\n\tshorttitle = {{EARL}-{BO}},\n\turl = {http://arxiv.org/abs/2411.00171},\n\tdoi = {10.48550/arXiv.2411.00171},\n\tabstract = {Conventional methods for Bayesian optimization (BO) primarily involve one-step optimal decisions (e.g., maximizing expected improvement of the next step). To avoid myopic behavior, multi-step lookahead BO algorithms such as rollout strategies consider the sequential decision-making nature of BO, i.e., as a stochastic dynamic programming (SDP) problem, demonstrating promising results in recent years. However, owing to the curse of dimensionality, most of these methods make significant approximations or suffer scalability issues, e.g., being limited to two-step lookahead. This paper presents a novel reinforcement learning (RL)-based framework for multi-step lookahead BO in high-dimensional black-box optimization problems. The proposed method enhances the scalability and decision-making quality of multi-step lookahead BO by efficiently solving the SDP of the BO process in a near-optimal manner using RL. We first introduce an Attention-DeepSets encoder to represent the state of knowledge to the RL agent and employ off-policy learning to accelerate its initial training. We then propose a multi-task, fine-tuning procedure based on end-to-end (encoder-RL) on-policy learning. We evaluate the proposed method, EARL-BO (Encoder Augmented RL for Bayesian Optimization), on both synthetic benchmark functions and real-world hyperparameter optimization problems, demonstrating significantly improved performance compared to existing multi-step lookahead and high-dimensional BO methods.},\n\turldate = {2026-01-25},\n\tpublisher = {arXiv},\n\tauthor = {Cheon, Mujin and Lee, Jay H. and Koh, Dong-Yeun and Tsay, Calvin},\n\tmonth = jul,\n\tyear = {2025},\n\tnote = {arXiv:2411.00171 [cs]},\n\tkeywords = {Computer Science - Machine Learning, Mathematics - Optimization and Control},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Solution-Processable Redox-Active Polyimides: Synthesis and CO2 Responsive Properties.\n \n \n \n \n\n\n \n Lee, S.; and Koh, D.\n\n\n \n\n\n\n Membrane Journal, 35(4): 379–386. February 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"Solution-Processable$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{lee_solution-processable_2025,\n\ttitle = {Solution-{Processable} {Redox}-{Active} {Polyimides}: {Synthesis} and {CO2} {Responsive} {Properties}},\n\tvolume = {35},\n\turl = {http://membranejournal.or.kr/journal/article.php?code=95968},\n\tdoi = {10.14579/MEMBRANE_JOURNAL.2025.35.4.379},\n\tnumber = {4},\n\turldate = {2026-01-31},\n\tjournal = {Membrane Journal},\n\tauthor = {Lee, Sunggyu and Koh, Dong-Yeun},\n\tmonth = feb,\n\tyear = {2025},\n\tdoi = {10.14579/MEMBRANE_JOURNAL.2025.35.4.379},\n\tpages = {379--386},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n PIM-7 as a Redox Responsive Polymer Platform for CO2 Capture.\n \n \n \n \n\n\n \n Hwang, Y.; and Koh, D.\n\n\n \n\n\n\n Membrane Journal, 35(4): 405–418. February 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"PIM-7$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{hwang_pim-7_2025,\n\ttitle = {{PIM}-7 as a {Redox} {Responsive} {Polymer} {Platform} for {CO2} {Capture}},\n\tvolume = {35},\n\turl = {http://membranejournal.or.kr/journal/article.php?code=95971},\n\tdoi = {10.14579/MEMBRANE_JOURNAL.2025.35.4.405},\n\tnumber = {4},\n\turldate = {2026-01-31},\n\tjournal = {Membrane Journal},\n\tauthor = {Hwang, Young-Eun and Koh, Dong-Yeun},\n\tmonth = feb,\n\tyear = {2025},\n\tdoi = {10.14579/MEMBRANE_JOURNAL.2025.35.4.405},\n\tpages = {405--418},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Bifunctionally Hydrophobic MOF-Supported Platinum Catalyst for the Removal of Ultralow Concentration Hydrogen Isotope.\n \n \n \n \n\n\n \n Heo, H.; Jang, J.; Jeong, E.; Kim, H.; Kim, Y. J.; Park, C. W.; So, J.; and Koh, D.\n\n\n \n\n\n\n ENERGY & ENVIRONMENTAL MATERIALS, 8(2): e12815. 2025.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/eem2.12815\n\n\n\n
\n\n\n\n \n \n $\"Bifunctionally$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{heo_bifunctionally_2025,\n\ttitle = {Bifunctionally {Hydrophobic} {MOF}-{Supported} {Platinum} {Catalyst} for the {Removal} of {Ultralow} {Concentration} {Hydrogen} {Isotope}},\n\tvolume = {8},\n\tcopyright = {© 2024 The Author(s). Energy \\& Environmental Materials published by John Wiley \\& Sons Australia, Ltd on behalf of Zhengzhou University.},\n\tissn = {2575-0356},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/eem2.12815},\n\tdoi = {10.1002/eem2.12815},\n\tabstract = {Water often presents significant challenges in catalysts by deactivating active sites, poisoning the reaction, and even degrading composite structure. These challenges are amplified when the water participates as a reactant and is fed as a liquid phase, such as trickle bed-type reactors in a hydrogen-water isotope exchange (HIE) reaction. The key balance in such multiphase reactions is the precise control of catalyst design to repel bulk liquid water while diffusing water vapor. Herein, a platinum-incorporated metal-organic framework (MIL-101) based bifunctional hydrophobic catalyst functionalized with long alkyl chains (C12, dodecylamine) and further manufactured with poly(vinylidene fluoride), Pt@MIL-101-12/PVDF, has been developed which can show dramatically improved catalytic activity under multi-phase reactions involving hydrogen gas and liquid water. Pt@MIL-101-12/PVDF demonstrates enhanced macroscopic water-blocking properties, with a notable reduction of over 65\\% in water adsorption capacity and newly introduced liquid water repellency, while exhibiting a negligible increase in mass transfer resistance, i.e., bifunctional hydrophobicity. Excellent catalytic activity, evaluated via HIE reaction, and its durability underscore the impact of bifunctional hydrophobicity. In situ DRIFTS analysis elucidates water adsorption/desorption dynamics within the catalyst composite, highlighting reinforced water diffusion at the microscopic level, affirming the catalyst's bifunctionality in different length scales. With demonstrated radiation resistance, Pt@MIL-101-12/PVDF emerges as a promising candidate for isotope exchange reactions.},\n\tlanguage = {en},\n\tnumber = {2},\n\turldate = {2026-01-25},\n\tjournal = {ENERGY \\& ENVIRONMENTAL MATERIALS},\n\tauthor = {Heo, Huiryung and Jang, Jeong-un and Jeong, Euna and Kim, Hyung-Ju and Kim, Young Jin and Park, Chan Woo and So, Jungseob and Koh, Dong-Yeun},\n\tyear = {2025},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/eem2.12815},\n\tkeywords = {bifunctional hydrophobic catalyst, hydrogen-water isotope exchange, hydrophobic modification, metal–organic framework, tritium removal},\n\tpages = {e12815},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n CuI-Embedded fiber sorbent with CO selective adsorption for High-Purity H2 recovery.\n \n \n \n \n\n\n \n Lee, S.; Heo, H.; Kim, H.; So, J.; Lee, J. W.; and Koh, D.\n\n\n \n\n\n\n Chemical Engineering Journal, 503: 158576. January 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"CuI-Embedded$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{lee_cui-embedded_2025,\n\ttitle = {{CuI}-{Embedded} fiber sorbent with {CO} selective adsorption for {High}-{Purity} {H2} recovery},\n\tvolume = {503},\n\tissn = {1385-8947},\n\turl = {https://www.sciencedirect.com/science/article/pii/S1385894724100678},\n\tdoi = {10.1016/j.cej.2024.158576},\n\tabstract = {Carbon monoxide (CO) removal techniques are critically important in the context of hydrogen (H2) purification to achieve an economically viable hydrogen value chain. Herein, we develop the new type of structured sorbents, CuI-embedded fiber sorbents, fabricated by incorporating Cu sources into MOF/polymer composite fibers, for selective removal of CO from H2-rich gas. CuI-embedded fiber sorbents show remarkable dynamic adsorption performance, 1.4 – 2.6 times greater dynamic sorption capacities than those of pure MIL-101(Cr)/PVDF fiber, across the range of CO compositions and cyclic stability under the static and/or dynamic adsorption conditions. We also confirm that the form-factor of support can influence to the aggregation effect of infused copper species. Notably, compared to the powder form sorbents, these fiber-form sorbents show enhanced copper dispersion ability, resulting in the ultrahigh Cu utilization degree. The new CuI active sites, identified from the in-situ CO diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis, further elucidate the highly dispersed Cu contents, implying that the formation of active metal sites with different micro-environments. This work highlights the new concepts of the adsorption-based carbon monoxide removal system with potential application for high-purity H2 recovery.},\n\turldate = {2026-01-25},\n\tjournal = {Chemical Engineering Journal},\n\tauthor = {Lee, Sunggyu and Heo, Huiryung and Kim, Hyunjung and So, Jungseob and Lee, Jae W. and Koh, Dong-Yeun},\n\tmonth = jan,\n\tyear = {2025},\n\tpages = {158576},\n}\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Facile membrane upscaling via in-situ synthesis of PVA hydrogel for harsh solvent separation: From transport study to industrial application.\n \n \n \n \n\n\n \n Kwon, Y.; Kim, D.; Park, I.; Park, Y.; Nam, S.; and Koh, D.\n\n\n \n\n\n\n Chemical Engineering Journal, 512: 162558. May 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"Facile$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{kwon_facile_2025,\n\ttitle = {Facile membrane upscaling via in-situ synthesis of {PVA} hydrogel for harsh solvent separation: {From} transport study to industrial application},\n\tvolume = {512},\n\tissn = {1385-8947},\n\tshorttitle = {Facile membrane upscaling via in-situ synthesis of {PVA} hydrogel for harsh solvent separation},\n\turl = {https://www.sciencedirect.com/science/article/pii/S1385894725033844},\n\tdoi = {10.1016/j.cej.2025.162558},\n\tabstract = {In this study, a facile upscaled membrane module was developed using an in-situ hydrogel synthesis technique for the selective removal of water from harsh organic solvent mixtures by pervaporation. Polyvinyl alcohol (PVA) was chosen as the hydrophilic membrane material due to its ease of chemical modification and high processible film-forming stability. A porous α-alumina hollow fiber was used as a support, and an in-situ hydrogel reaction with glutaraldehyde was employed to form a uniform selective layer without the penetration issues commonly faced during conventional membrane fabrication. It was found that the synthesized hydrogel (s-HPGA) exhibited improved water permeation performance resulting from the mechanically expanded free volume within the membrane matrix and uncommon diffusive properties verified by diffusivity modeling. The effectiveness of the fabricated s-HPGA membrane modules was demonstrated through a cyclic pervaporation test involving an epoxy manufacturing by-product mixture. The results showed that the module achieved stable performance and efficient water separation over 200 h of operation with a recovery rate of over 98\\%. In addition, the field application test demonstrated that the s-HPGA membrane module is well-suited for industrial applications requiring solvent enrichment and efficient dehydration.},\n\turldate = {2026-01-19},\n\tjournal = {Chemical Engineering Journal},\n\tauthor = {Kwon, YongSung and Kim, Daehun and Park, Injun and Park, YouIn and Nam, SeungEun and Koh, Dong-Yeun},\n\tmonth = may,\n\tyear = {2025},\n\tkeywords = {In-situ synthesis of PVA hydrogel, Module engineering, Organic solvent dehydration, PVA (Polyvinyl Alcohol), Pervaporation},\n\tpages = {162558},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Enhancing interchain interactions in spirobifluorene-based microporous polyimides for high-performance organic solvent nanofiltration.\n \n \n \n \n\n\n \n Jang, M.; Chen, Y.; Choi, J.; Seo, H.; Chung, Y. G.; and Koh, D.\n\n\n \n\n\n\n Journal of Membrane Science, 733: 124298. September 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"Enhancing$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{jang_enhancing_2025,\n\ttitle = {Enhancing interchain interactions in spirobifluorene-based microporous polyimides for high-performance organic solvent nanofiltration},\n\tvolume = {733},\n\tissn = {0376-7388},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0376738825006118},\n\tdoi = {10.1016/j.memsci.2025.124298},\n\tabstract = {Organic solvent nanofiltration (OSN) is a rapidly developing membrane technology with transformative potential for purifying and separating organic compounds. Membranes made from polymers of intrinsic microporosity (PIMs) are particularly well-suited for OSN due to their intrinsic microporosity, which facilitates high solvent flux. However, PIMs are typically prone to swelling in organic solvents, leading to dilated pore structures and, consequently, low selectivity. Strengthening the interactions between the polymer chains can help to reduce this swelling. Herein, 9,9′-spirobifluorene (SBF)-based microporous polyimides are synthesized, and they exhibited relatively low degrees of swelling in organic liquids compared to prototypical PIM-1. SBF-based polyimides were fabricated into thin-film composite membranes, and one of them achieved sharp separation (selectivity up to 8.54 between solutes with a molecular weight difference of less than 200 g mol−1). The membrane's reduced swelling and improved interchain interactions enable high-resolution molecular separations in organic solvents. These results suggest that the strategy of introducing enhanced interchain interactions into PIMs could prove beneficial in addressing challenging separation processes in high-value industires.},\n\turldate = {2026-01-19},\n\tjournal = {Journal of Membrane Science},\n\tauthor = {Jang, Min-Jun and Chen, Yu and Choi, Jihoon and Seo, Hyeokjun and Chung, Yongchul G. and Koh, Dong-Yeun},\n\tmonth = sep,\n\tyear = {2025},\n\tkeywords = {Microporous polyimide, Organic solvent nanofiltration (OSN), Polymers of intrinsic microporosity (PIMs), Spirobifluorene (SBF)},\n\tpages = {124298},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Dual path biphasic column for highly selective and ultrafast organic solvent membrane extraction.\n \n \n \n \n\n\n \n Kim, B. Q.; Lee, J.; Kim, H.; Kim, S.; Lee, K.; Koh, D.; and Choi, S. Q.\n\n\n \n\n\n\n Nature Communications, 16(1): 6462. July 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"Dual$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{kim_dual_2025,\n\ttitle = {Dual path biphasic column for highly selective and ultrafast organic solvent membrane extraction},\n\tvolume = {16},\n\tcopyright = {2025 The Author(s)},\n\tissn = {2041-1723},\n\turl = {https://www.nature.com/articles/s41467-025-61777-z},\n\tdoi = {10.1038/s41467-025-61777-z},\n\tabstract = {Despite significant advances in membrane technology, achieving efficient separation in organic solvent nanofiltration (OSN) remains a major challenge in the chemical and pharmaceutical industries, particularly when dealing with multicomponent molecular mixtures. To address this, in this study, we develop a biphasic column for organic solvent membrane extraction, which consists of closely packed micron-sized water droplets covered by sub-nanometer-thick ion-ligand complexes that serve as size-exclusive membranes. Molecular mixtures dissolved in an organic solvent can be selectively extracted into the droplets through the interfacial complexes based on their sizes, while the solvent flows through the micron-scale interstices between the droplets. This solute-solvent dual pathway design minimizes resistance in solvent convection, resulting in high productivity, while simultaneously achieving a high separation factor through the monodisperse nanopores of the interfacial complexes. Using aluminum ion-carboxylate terminated polydimethylsiloxane complexes as a representative, the column demonstrates a controllable, high separation factor of 600 with a productivity of 1100 L·m−2·hour−1·bar−1 in cyclohexane, significantly outperforming conventional membrane OSN.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2026-01-19},\n\tjournal = {Nature Communications},\n\tpublisher = {Nature Publishing Group},\n\tauthor = {Kim, Baekmin Q. and Lee, Jaehong and Kim, Hanul and Kim, Subeen and Lee, Kyoungmun and Koh, Dong-Yeun and Choi, Siyoung Q.},\n\tmonth = jul,\n\tyear = {2025},\n\tkeywords = {Organic–inorganic nanostructures, Pollution remediation, Porous materials},\n\tpages = {6462},\n}\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Atomically dispersed silver on nanosheet-stacked amorphous alumina for enhanced NOx reduction.\n \n \n \n \n\n\n \n Jang, J.; So, J.; Heo, H.; Yoo, C.; You, Y. W.; Kim, Y. J.; and Koh, D.\n\n\n \n\n\n\n Chemical Engineering Journal, 521: 167052. October 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"Atomically$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{jang_atomically_2025,\n\ttitle = {Atomically dispersed silver on nanosheet-stacked amorphous alumina for enhanced {NOx} reduction},\n\tvolume = {521},\n\tissn = {1385-8947},\n\turl = {https://www.sciencedirect.com/science/article/pii/S138589472507891X},\n\tdoi = {10.1016/j.cej.2025.167052},\n\tabstract = {Tailoring anchoring sites in Al2O3 to strengthen metal-support interactions (MSI) remains a challenge yet essential for designing robust single-atom catalysts. Herein, nanosheet-stacked amorphous alumina (mAl2O3) with enhanced surface area and abundant hydroxyl groups was prepared by controlling the thermal treatment protocol of an Al-containing MOF. Loading 1 wt\\% Ag onto mAl2O3 led to atomically dispersed Ag species due to strong MSI, enabled by effective anchoring onto terminal hydroxyl groups uniquely distributed on mAl2O3, where both OH-μ1-AlIV and OH-μ1-AlVI sites coexist, unlike conventional Al2O3, predominantly featuring OH-μ1-AlVI alone. In hydrocarbon selective catalytic reduction, Ag(1)/mAl2O3 demonstrated markedly higher deNOx activity, exceptional water resistance, and durability. Detailed surface studies confirmed the facilitated formation of reactive enolic species and surface nitrates (NO3−) on Ag(1)/mAl2O3, which accelerated isocyanate (−NCO) formation, the key intermediate for selective NOx reduction. This work introduces an innovative method to produce Al2O3 with tunable surface structures, fostering highly active single-atom catalysts.},\n\turldate = {2026-01-19},\n\tjournal = {Chemical Engineering Journal},\n\tauthor = {Jang, Jeong-Un and So, Jungseob and Heo, Huiryung and Yoo, Chun-Jae and You, Young Woo and Kim, Young Jin and Koh, Dong-Yeun},\n\tmonth = oct,\n\tyear = {2025},\n\tkeywords = {MOF-derived alumina, NOx conversion, Silver, Single atom catalyst, Terminal hydroxyls},\n\tpages = {167052},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Tailoring MnO2 nanodomains in organic-inorganic hybrid interfaces toward tunable hydrocarbon separation.\n \n \n \n \n\n\n \n Choi, J.; Shin, W.; Seo, H.; Heo, H.; Jang, M.; and Koh, D.\n\n\n \n\n\n\n Journal of Membrane Science, 736: 124615. December 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"Tailoring$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{choi_tailoring_2025,\n\ttitle = {Tailoring {MnO2} nanodomains in organic-inorganic hybrid interfaces toward tunable hydrocarbon separation},\n\tvolume = {736},\n\tissn = {0376-7388},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0376738825009287},\n\tdoi = {10.1016/j.memsci.2025.124615},\n\tabstract = {Organic solvent nanofiltration offers an energy-saving alternative to distillation for hydrocarbon fractionation. Here, we introduce a simple and scalable method for fabricating novel organic-inorganic hybrid membranes from polybenzimidazole (PBI) and manganese oxide (MnO2), designed for the separation of complex hydrocarbons. Homogeneously integrated MnO2 domains, formed via oxidative interaction with imidazole moieties within the PBI matrix, create a rigid hybrid structure with enhanced molecular selectivity. By systematically tuning PBI concentration, KMnO4 dosage, and reaction time, we achieved membranes with low molecular weight cut-off (MWCO) as low as 266 g mol−1. Notably, these membranes surpassed the reported upper bound for toluene/1,3,5-triisopropylbenzene separation and demonstrated effective fractionation of complex hydrocarbon mixtures, such as naphtha, enriching the lighter fractions. This study clarifies the role of KMnO4 in PBI modification: rather than inducing direct N–N crosslinking as previously suggested, it facilitates the in situ generation of crystalline MnO2 domains that bolster membrane rigidity and molecular selectivity. These findings underscore the potential of hybrid PBI membranes as a practical platform for membrane-assisted crude oil fractionation and offer prospects for advanced energy-efficient separation strategies.},\n\turldate = {2026-01-19},\n\tjournal = {Journal of Membrane Science},\n\tauthor = {Choi, Jihoon and Shin, Woong-Chul and Seo, Hyeokjun and Heo, Huiryung and Jang, Min-Jun and Koh, Dong-Yeun},\n\tmonth = dec,\n\tyear = {2025},\n\tkeywords = {In situ oxidation, Manganese oxide, Molecular weight cut-off, Organic solvent nanofiltration, Organic-inorganic hybrid membrane},\n\tpages = {124615},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Accelerating process design for direct air capture: Bayesian optimization of temperature-vacuum swing adsorption with fiber sorbents.\n \n \n \n \n\n\n \n Jeong, J.; Cheon, M.; Oh, B.; Jamal, A.; Lee, J. H.; and Koh, D.\n\n\n \n\n\n\n Carbon Capture Science & Technology, 17: 100526. December 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"Accelerating$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{jeong_accelerating_2025,\n\ttitle = {Accelerating process design for direct air capture: {Bayesian} optimization of temperature-vacuum swing adsorption with fiber sorbents},\n\tvolume = {17},\n\tissn = {2772-6568},\n\tshorttitle = {Accelerating process design for direct air capture},\n\turl = {https://www.sciencedirect.com/science/article/pii/S2772656825001630},\n\tdoi = {10.1016/j.ccst.2025.100526},\n\tabstract = {Solid sorbent-based direct air capture (DAC) is a key carbon dioxide removal strategy, yet its process optimization remains challenging due to the need to simultaneously address multiple, high-dimensional objectives. These include maximizing CO2 capture capacity, minimizing operating costs, and reducing overall carbon emissions across the system's life cycle. In this study, we experimentally present a refined approach for optimizing a dual-bed temperature and vacuum swing adsorption (TVSA) cycle using a fiber sorbent based on the metal-organic framework NbOFFIVE-1-Ni, aiming to understand and reconcile the competing performance objectives. To achieve this, a structured exploration of the critical operational variables was conducted, encompassing adsorption flow rate, adsorption time, desorption temperature, and desorption time. Recognizing the complexity and interrelated nature of the performance metrics, we adopted Bayesian Optimization, a powerful data-driven method, to iteratively identify operating conditions that maximize CO2 capture efficiency while minimizing operational expenditure (OPEX). Extensive cycle-level testing and performance assessment produced a DAC performance profile characterized by distinct Pareto fronts, which delineate the inherent trade-offs between energy consumption and capture efficiency. These insights enabled the determination of optimal operating conditions. Notably, the lab-scale dual bed system achieved a capture capacity of 21.76 mol CO2 per year (0.52 g-CO2/g-sorbent per day), supporting its feasibility for large-scale, cost-effective, and environmentally responsible DAC deployment.},\n\turldate = {2026-01-19},\n\tjournal = {Carbon Capture Science \\& Technology},\n\tauthor = {Jeong, Jinhong and Cheon, Mujin and Oh, Banseok and Jamal, Aqil and Lee, Jay H. and Koh, Dong-Yeun},\n\tmonth = dec,\n\tyear = {2025},\n\tkeywords = {Bayesian optimization, Direct air capture, Fiber sorbent, Operational Expenditure, Temperature-vacuum swing adsorption},\n\tpages = {100526},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n A strategic design of iCVD copolymers for high-performance organic solvent nanofiltration membranes with tunable permeance and selectivity.\n \n \n \n \n\n\n \n Choi, J.; Kim, D.; Choi, K.; Seo, H.; Jang, M.; So, H.; Im, S. G.; Yoo, Y.; and Koh, D.\n\n\n \n\n\n\n Chemical Engineering Journal, 524: 169165. November 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"A$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{choi_strategic_2025,\n\ttitle = {A strategic design of {iCVD} copolymers for high-performance organic solvent nanofiltration membranes with tunable permeance and selectivity},\n\tvolume = {524},\n\tissn = {1385-8947},\n\turl = {https://www.sciencedirect.com/science/article/pii/S1385894725100089},\n\tdoi = {10.1016/j.cej.2025.169165},\n\tabstract = {Organic solvent nanofiltration (OSN) holds promise for reducing industrial solvent waste, yet membrane materials still face a critical challenge: achieving both robust permeance and high solute rejection. Herein, we introduce a molecular design strategy for high-performance OSN membranes with adjustable monomer composition using initiated chemical vapor deposition (iCVD). Vapor phase copolymerization between a rigid, highly cross-linkable monomer (1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane) and relatively soft, bulky monomer (cyclohexyl methacrylate) allowed the formation of an active layer with exquisitely tailored copolymer composition for high-performance OSN membrane. By precisely adjusting the ratio of monomers, both the solvent permeance and solute selectivity of the thin film copolymer membranes could be controlled precisely, overcoming the conventional trade-off, which is hard to achieve in solution processing. Notably, the copolymer membrane with the highest permeance ({\\textasciitilde}2.43 L m−2 h−1 bar−1) achieved up to a 6.5-fold increase in acetone permeance without compromising the molecular weight cut-off ({\\textasciitilde}370 g mol−1) with the optimized copolymer composition. Such findings highlight the potential of the molecularly designed copolymer membrane as a promising selective layer in OSN processes, providing scalable, defect-free, and high-performance separation solutions, particularly for the pharmaceutical and chemical industries.},\n\turldate = {2026-01-19},\n\tjournal = {Chemical Engineering Journal},\n\tauthor = {Choi, Jihoon and Kim, Daehun and Choi, Keonwoo and Seo, Hyeokjun and Jang, Min-Jun and So, Hyoseok and Im, Sung Gap and Yoo, Youngmin and Koh, Dong-Yeun},\n\tmonth = nov,\n\tyear = {2025},\n\tkeywords = {Copolymerization, Initiated chemical vapor deposition (iCVD), Molecular weight cut-off, Organic solvent nanofiltration (OSN), Solvent permeance},\n\tpages = {169165},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Design of Electrified Fiber Sorbents for Direct Air Capture with Electrically-Driven Temperature Vacuum Swing Adsorption.\n \n \n \n \n\n\n \n Lee, Y. H.; Lee, J. H.; Joo, H.; Massen-Hane, M.; Park, I.; Rho, S.; Jamal, A.; Alan Hatton, T.; and Koh, D.\n\n\n \n\n\n\n Advanced Materials, 37(45): e04542. 2025.\n _eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/adma.202504542\n\n\n\n
\n\n\n\n \n \n $\"Design$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{lee_design_2025,\n\ttitle = {Design of {Electrified} {Fiber} {Sorbents} for {Direct} {Air} {Capture} with {Electrically}-{Driven} {Temperature} {Vacuum} {Swing} {Adsorption}},\n\tvolume = {37},\n\tcopyright = {© 2025 The Author(s). Advanced Materials published by Wiley-VCH GmbH},\n\tissn = {1521-4095},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adma.202504542},\n\tdoi = {10.1002/adma.202504542},\n\tabstract = {Joule heating is becoming accepted as a highly efficient regeneration technique for temperature vacuum swing adsorption in direct air capture (DAC). This acknowledgment arises from its ability to rapidly generate and transfer heat, along with the convenience of obtaining electrical power from renewable sources. This study presents a unique electrified fiber sorbent (i.e., e-fiber) design that facilitates Joule heating, enabling energy-efficient electrically-driven temperature-vacuum swing adsorption (e-TVSA) for DAC. The e-fiber sorbent is produced via a dip coating technique, in which a silver composite solution is applied to the surface of an open-porous polymer matrix. The resulting ultra-thin, interconnected porous conductive layer on the fiber surface not only minimizes the increase in diffusion resistance even after the surface coating process but also offers exceptionally low electrical resistance (0.5 Ω cm−1). The e-fiber sorbent module achieves a desorption temperature of 110 °C in 80 s at 3 V. Notably, only a 5\\% reduction in capacity is recorded following repeated cycles of e-TVSA at a CO2 concentration of 400 ppm. The complicated nature of heat transfer processes is clarified caused by Joule heating in the e-fiber sorbent module through detailed case studies conducted with computational simulations, offering insights for design optimization and system engineering.},\n\tlanguage = {en},\n\tnumber = {45},\n\turldate = {2026-01-19},\n\tjournal = {Advanced Materials},\n\tauthor = {Lee, Young Hun and Lee, Jung Hun and Joo, Hwajoo and Massen-Hane, Michael and Park, Injun and Rho, Soohyeon and Jamal, Aqil and Alan Hatton, T. and Koh, Dong-Yeun},\n\tyear = {2025},\n\tnote = {\\_eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/adma.202504542},\n\tkeywords = {Joule heating, direct air capture, dry-jet wet-quench spinning, electrically-driven temperature-vacuum swing adsorption (e-TVSA), electrified fiber sorbents},\n\tpages = {e04542},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Exploring the impact of hourly variability of air condition on the efficiency of direct air capture.\n \n \n \n \n\n\n \n Jung, H.; Kim, K.; Jeong, J.; Jamal, A.; Koh, D.; and Lee, J. H.\n\n\n \n\n\n\n Chemical Engineering Journal, 508: 160840. March 2025.\n \n\n\n\n
\n\n\n\n \n \n $\"Exploring$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{jung_exploring_2025,\n\ttitle = {Exploring the impact of hourly variability of air condition on the efficiency of direct air capture},\n\tvolume = {508},\n\tissn = {1385-8947},\n\turl = {https://www.sciencedirect.com/science/article/pii/S1385894725016614},\n\tdoi = {10.1016/j.cej.2025.160840},\n\tabstract = {Direct Air Capture (DAC) is increasingly acknowledged as a pivotal technology for combating climate change and advancing global decarbonization initiatives. By actively removing CO2 from the atmosphere, DAC offers a scalable approach to manage residual emissions and attain net-zero carbon goals, augmenting existing mitigation strategies. Nevertheless, the efficacy of DAC is considerably influenced by environmental conditions such as ambient temperature and humidity, which can significantly affect its operational performance. This study delves into the impact of such environmental variations, focusing specifically on the energy consumption and productivity of DAC processes under daily and hourly fluctuating air conditions. Dynamic simulations coupled with the optimization of operating parameters were employed to investigate these effects. Bayesian optimization was utilized to refine the parameters for optimal DAC performance efficiently. The study evaluated cyclic DAC operations employing Temperature-Vacuum-Swing Adsorption (TVSA) across four diverse climatic zones—hot/dry, hot/humid, cold/dry, and cold/humid, during both winter and summer seasons. Results indicate that high humidity levels detrimentally impact DAC efficiency by increasing the heat required for H2O desorption, the work of pumps, and the duration of desorption processes, which escalates energy use and diminishes productivity. Furthermore, hourly fluctuations in air conditions significantly degraded DAC performance, resulting in up to a 35.9\\% increase in energy consumption and a 22.2\\% reduction in productivity compared to monthly-averaged air conditions with constant values. Re-optimizing the operating parameters to account for variations in ambient air resulted in approximately a 5\\% improvement in both energy consumption and productivity. These enhancements could be further optimized through the implementation of advanced control systems that dynamically adjust operating parameters for each cycle based on forecasted air conditions. The findings help bridge the gap between predicted performance and actual operational outcomes, supporting the strategic deployment of scaled-up DAC processes to achieve optimal economic outcomes.},\n\turldate = {2026-01-19},\n\tjournal = {Chemical Engineering Journal},\n\tauthor = {Jung, Howoun and Kim, Kyunam and Jeong, Jinhong and Jamal, Aqil and Koh, Dong-Yeun and Lee, Jay H.},\n\tmonth = mar,\n\tyear = {2025},\n\tkeywords = {Direct air capture, Dynamic simulation, Optimization, Techno-economic analysis},\n\tpages = {160840},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n Direct Air Capture (DAC) is increasingly acknowledged as a pivotal technology for combating climate change and advancing global decarbonization initiatives. By actively removing CO2 from the atmosphere, DAC offers a scalable approach to manage residual emissions and attain net-zero carbon goals, augmenting existing mitigation strategies. Nevertheless, the efficacy of DAC is considerably influenced by environmental conditions such as ambient temperature and humidity, which can significantly affect its operational performance. This study delves into the impact of such environmental variations, focusing specifically on the energy consumption and productivity of DAC processes under daily and hourly fluctuating air conditions. Dynamic simulations coupled with the optimization of operating parameters were employed to investigate these effects. Bayesian optimization was utilized to refine the parameters for optimal DAC performance efficiently. The study evaluated cyclic DAC operations employing Temperature-Vacuum-Swing Adsorption (TVSA) across four diverse climatic zones—hot/dry, hot/humid, cold/dry, and cold/humid, during both winter and summer seasons. Results indicate that high humidity levels detrimentally impact DAC efficiency by increasing the heat required for H2O desorption, the work of pumps, and the duration of desorption processes, which escalates energy use and diminishes productivity. Furthermore, hourly fluctuations in air conditions significantly degraded DAC performance, resulting in up to a 35.9% increase in energy consumption and a 22.2% reduction in productivity compared to monthly-averaged air conditions with constant values. Re-optimizing the operating parameters to account for variations in ambient air resulted in approximately a 5% improvement in both energy consumption and productivity. These enhancements could be further optimized through the implementation of advanced control systems that dynamically adjust operating parameters for each cycle based on forecasted air conditions. The findings help bridge the gap between predicted performance and actual operational outcomes, supporting the strategic deployment of scaled-up DAC processes to achieve optimal economic outcomes.\n

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\n \n\n \n \n \n \n \n \n Activating iodine redox by enabling single-atom coordination to dormant nitrogen sites to realize durable zinc–iodine batteries.\n \n \n \n \n\n\n \n Lee, J.; Lee, W.; Back, S.; Yi, S. Y.; Lee, S.; Kim, S.; Moon, J.; Koh, D.; Kim, K.; Back, S.; and Lee, J.\n\n\n \n\n\n\n EES Catalysis, 2(1): 276–285. January 2024.\n \n\n\n\n
\n\n\n\n \n \n $\"Activating$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{lee_activating_2024,\n\ttitle = {Activating iodine redox by enabling single-atom coordination to dormant nitrogen sites to realize durable zinc–iodine batteries},\n\tvolume = {2},\n\tissn = {2753-801X},\n\turl = {https://pubs.rsc.org/en/content/articlelanding/2024/ey/d3ey00228d},\n\tdoi = {10.1039/D3EY00228D},\n\tabstract = {Aqueous rechargeable static zinc–iodine (Zn–I2) batteries are regarded as competitive candidates for next-generation energy storage devices owing to their safety and high energy density. However, their inherent limitations such as the shuttle effect, sluggish electrochemical kinetics, and the poor electrical conductivity of iodine have been challenging to mitigate when using methods that confer polarity to the surface of the carbon host through nitrogen doping. Moreover, the considerable prevalence of inactive pyridinic N sites significantly impedes the establishment of approaches to overcome issues associated with redox kinetics and iodine utilization. Herein, single Ni atoms were incorporated into an electrochemically inactive N-doped carbon matrix by carbonizing a zeolitic imidazolate framework and then thermally activating the Ni ions adsorbed onto the carbonized product. The single Ni atoms modulated the electronic structure of the surrounding N-doped carbon matrix, thereby improving its ability to adsorb polyiodides and exhibit bifunctional catalytic activity for iodine reduction and oxidation reactions. Consequently, the assembled Zn–I2 battery delivered an outstanding rate performance (193 mA h g−1 at a current density of 6 A g−1) and ultralong cyclability (10 000 cycles at a current density of 4 A g−1). Overall, this study illuminates the merits of using single-atom catalysts to revitalize inactive N pyridinic sites, thereby providing a promising direction for further advancement of Zn–I2 batteries.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2026-01-25},\n\tjournal = {EES Catalysis},\n\tpublisher = {RSC},\n\tauthor = {Lee, Jisung and Lee, Wooseok and Back, Seungho and Yi, Seung Yeop and Lee, Seonggyu and Kim, Seongseop and Moon, Joonhee and Koh, Dong-Yeun and Kim, Kyeounghak and Back, Seoin and Lee, Jinwoo},\n\tmonth = jan,\n\tyear = {2024},\n\tpages = {276--285},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Ultrathin organosiloxane membrane for precision organic solvent nanofiltration.\n \n \n \n \n\n\n \n Choi, J.; Choi, K.; Kwon, Y.; Kim, D.; Yoo, Y.; Im, S. G.; and Koh, D.\n\n\n \n\n\n\n Nature Communications, 15(1): 2800. March 2024.\n \n\n\n\n
\n\n\n\n \n \n $\"Ultrathin$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n\n\n\n

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@article{choi_ultrathin_2024,\n\ttitle = {Ultrathin organosiloxane membrane for precision organic solvent nanofiltration},\n\tvolume = {15},\n\tcopyright = {2024 The Author(s)},\n\tissn = {2041-1723},\n\turl = {https://www.nature.com/articles/s41467-024-47115-9},\n\tdoi = {10.1038/s41467-024-47115-9},\n\tabstract = {Promising advances in membrane technology can lead to energy-saving and eco-friendly solutions in industrial sectors. This work demonstrates a highly selective membrane with ultrathin and highly interconnected organosiloxane polymer nanolayers by initiated chemical vapor deposition to effectively separate solutes within the molecular weight range of 150–300 g mol−1. We optimize the poly(1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane) membrane by adjusting both the thickness of the selective layer and the pore sizes of its support membranes. Notably, the 29 nm selective layer imparts a uniformly narrow molecular sieving property, providing a record-high solute-solute selectivity of 39.88 for different-sized solutes. Furthermore, a solute-solute selectivity of 11.04 was demonstrated using the real-world active pharmaceutical ingredient mixture of Acyclovir and Valacyclovir, key components for Herpes virus treatment, despite their molecular weight difference of less than 100 g mol−1. The highly interconnected membrane is expected to meet rigorous requirements for high-standard active pharmaceutical ingredient separation.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2026-01-25},\n\tjournal = {Nature Communications},\n\tpublisher = {Nature Publishing Group},\n\tauthor = {Choi, Jihoon and Choi, Keonwoo and Kwon, YongSung and Kim, Daehun and Yoo, Youngmin and Im, Sung Gap and Koh, Dong-Yeun},\n\tmonth = mar,\n\tyear = {2024},\n\tkeywords = {Chemical engineering, Polymers},\n\tpages = {2800},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Unveiling the role of catalytically active MXene supports in enhancing the performance and durability of cobalt oxygen evolution reaction catalysts for anion exchange membrane water electrolyzers.\n \n \n \n \n\n\n \n Park, Y. S.; Chae, A.; Choi, G. H.; Ram, S.; Lee, S.; Bhattacharjee, S.; Jung, J.; Jeon, H. S.; Ahn, C.; Hwang, S. S.; Koh, D.; In, I.; Oh, T.; Kim, S. J.; Koo, C. M.; and Lee, A. S.\n\n\n \n\n\n\n Applied Catalysis B: Environment and Energy, 346: 123731. June 2024.\n \n\n\n\n
\n\n\n\n \n \n $\"Unveiling$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{park_unveiling_2024,\n\ttitle = {Unveiling the role of catalytically active {MXene} supports in enhancing the performance and durability of cobalt oxygen evolution reaction catalysts for anion exchange membrane water electrolyzers},\n\tvolume = {346},\n\tissn = {0926-3373},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0926337324000420},\n\tdoi = {10.1016/j.apcatb.2024.123731},\n\tabstract = {The role of 2D transition metal carbides, also known as MXenes, as active catalyst supports in Co-based oxygen evolution reaction (OER) catalysts was elucidated through a combination of experimental and computation electrochemistry. Through facile seeding of commericial Co nanoparticles on three different MXene supports (Ti3C2Tx, Mo2Ti2C3Tx, Mo2CTx), Co@MXene catalysts were prepared and their electrochemical properties examined for alkaline OER electrocatalysts. The OER activity enhancement of Co was significantly improved for Mo2CTx and Mo2Ti2C3Tx supports, but marginal on the Ti3C2Tx in rotating disk electrode and membrane electrode assembly tests. The Co@Mo2CTx exhibited the highest anion exchange water electrolysis performance of 2.11 A cm−2 at 1.8 V with over 700 h of stable performance, exceeding previous benchmarks for non-platinum group (non-PGM) metal OER catalysts. The superior performance was attributed to the strong chemical interaction of Co nanoparticle with the Mo2CTx MXene support. Insights into the electrochemical and chemical oxidation according to MXene type as related to cell durability, as well the effect of electrical conductivity and inherent boosting of electrocatalytic activity of Mo-based MXenes elucidated through density functional theory (DFT) calculations helped explain the performance and durability enhancement of Mo-based MXene supports over Ti3C2Tx supports.},\n\turldate = {2026-01-25},\n\tjournal = {Applied Catalysis B: Environment and Energy},\n\tauthor = {Park, Young Sang and Chae, Ari and Choi, Gwan Hyun and Ram, Swetarekha and Lee, Seung-Cheol and Bhattacharjee, Satadeep and Jung, Jiyoon and Jeon, Hyo Sang and Ahn, Cheol-Hee and Hwang, Seung Sang and Koh, Dong-Yeun and In, Insik and Oh, Taegon and Kim, Seon Joon and Koo, Chong Min and Lee, Albert S.},\n\tmonth = jun,\n\tyear = {2024},\n\tkeywords = {Anion exchange membrane water electrolyzer, MXene, Oxygen evolution catalyst},\n\tpages = {123731},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Unexpected Molecular Sieving of Xylene Isomer Using Tethered Ligand in Polymer-Metal–Organic Frameworks (polyMOFs).\n \n \n \n \n\n\n \n Hyun, T.; Park, J.; So, J.; Kim, J.; and Koh, D.\n\n\n \n\n\n\n Advanced Science, 11(34): 2402980. 2024.\n _eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/advs.202402980\n\n\n\n
\n\n\n\n \n \n $\"Unexpected$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{hyun_unexpected_2024,\n\ttitle = {Unexpected {Molecular} {Sieving} of {Xylene} {Isomer} {Using} {Tethered} {Ligand} in {Polymer}-{Metal}–{Organic} {Frameworks} ({polyMOFs})},\n\tvolume = {11},\n\tcopyright = {© 2024 The Author(s). Advanced Science published by Wiley-VCH GmbH},\n\tissn = {2198-3844},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/advs.202402980},\n\tdoi = {10.1002/advs.202402980},\n\tabstract = {Promising advances in adsorption technology can lead to energy-efficient solutions in industrial sectors. This work presents precise molecular sieving of xylene isomers in the polymer-metal-oragnic framework (polyMOF), a hybrid porous material derived from the parent isoreticular MOF-1 (IRMOF-1). PolyMOFs are synthesized by polymeric ligands bridged by evenly spaced alkyl chains, showing reduced pore sizes and enhanced stabilities compared to its parent material due to tethered polymer bridge within the pores while maintaining the original rigid crystal lattice. However, the exact configuration of the ligands within the crystals remain unclear, posing hurdles to predicting the adsorption performances of the polyMOFs. This work reveals that the unique pore structure of polyIRMOF-1-7a can discriminate xylene isomers with sub-angstrom size differences, leading to highly selective adsorption of p-xylene over other isomers and alkylbenzenes in complex liquid mixtures (αpX/OM = 15 and αpX/OME = 9). The structural details of the polyIRMOF-1-7a are elucidated through computational studies, suggesting a plausible configuration of alkyl chains within the polyMOF crystal, which enable a record-high p-xylene selectivity and stability in liquid hydrocarbon. With this unprecedented molecular selectivity in MOFs, “polymer-MOF” hybridization is expected to meet rigorous requirements for high-standard molecular sieving through precisely tunable and highly stable pores.},\n\tlanguage = {en},\n\tnumber = {34},\n\turldate = {2026-01-25},\n\tjournal = {Advanced Science},\n\tauthor = {Hyun, Taehoon and Park, Junkil and So, Jungseob and Kim, Jihan and Koh, Dong-Yeun},\n\tyear = {2024},\n\tnote = {\\_eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/advs.202402980},\n\tkeywords = {MOF-polymer hybrid material, molecular sieving, polyMOFs, pore engineering},\n\tpages = {2402980},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Controlled organic solvent transport in ultramicroporous carbon membranes.\n \n \n \n \n\n\n \n Seo, H.; and Koh, D.\n\n\n \n\n\n\n Journal of Membrane Science, 709: 123089. September 2024.\n \n\n\n\n
\n\n\n\n \n \n $\"Controlled$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{seo_controlled_2024,\n\ttitle = {Controlled organic solvent transport in ultramicroporous carbon membranes},\n\tvolume = {709},\n\tissn = {0376-7388},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0376738824006835},\n\tdoi = {10.1016/j.memsci.2024.123089},\n\tabstract = {The drive to decarbonize chemical processes necessitates exploring low-energy solutions for separating complex liquid mixtures ubiquitous in food, pharmaceuticals, petrochemical, and synthetic fuel production industries. This report comprehensively investigates conceptualizing and implementing two novel organic solvent separation processes: Organic Solvent Forward Osmosis (OSFO) and Organic Solvent Pressure Assisted Osmosis (OSPAO). The intrinsic molecular specificity of ultramicroporous carbon molecular sieve (CMS) membranes allowed the unprecedented separation of a complex mixture of short-chain alcohols (e.g., methyl alcohol, ethyl alcohol, and isopropyl alcohol) at room temperature. A new hybridized membrane-based separation methodology, OSPAO, that combines the elements of organic solvent nanofiltration (OSN) and OSFO is introduced. CMS-based OSPAO demonstrated a marked enhancement in the flux of organic species permeate, considerably improving separation efficiencies. The separation modalities presented in this report underscore the essential role of osmosis in the differentiation of organic solvents, thereby contributing valuable insights to osmosis-based separation technologies.},\n\turldate = {2026-01-25},\n\tjournal = {Journal of Membrane Science},\n\tauthor = {Seo, Hyeokjun and Koh, Dong-Yeun},\n\tmonth = sep,\n\tyear = {2024},\n\tkeywords = {Direct liquid phase separation, Hollow fiber membrane, Organic solvent osmosis, Ultramicroporous carbon},\n\tpages = {123089},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Separation of Liquid Xylene Isomers Using Thin-Film Composite Carbon Molecular Sieve Hollow Fiber Membranes.\n \n \n \n \n\n\n \n Jang, M.; Seo, H.; and Koh, D.\n\n\n \n\n\n\n Industrial & Engineering Chemistry Research, 63(27): 12166–12176. July 2024.\n \n\n\n\n
\n\n\n\n \n \n $\"Separation$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{jang_separation_2024,\n\ttitle = {Separation of {Liquid} {Xylene} {Isomers} {Using} {Thin}-{Film} {Composite} {Carbon} {Molecular} {Sieve} {Hollow} {Fiber} {Membranes}},\n\tvolume = {63},\n\tissn = {0888-5885},\n\turl = {https://doi.org/10.1021/acs.iecr.4c01539},\n\tdoi = {10.1021/acs.iecr.4c01539},\n\tabstract = {Due to its distinct pore structure consisting of micropores and ultramicropores, carbon molecular sieve (CMS) is a promising material for creating membranes. However, the pyrolysis of an asymmetric polymer precursor to produce CMS membranes would compromise its inherent porous structure, resulting in a thick selective layer that might lead to a low flux membrane. Instead, thin composite membranes with selective CMS layers coated on porous substrates can provide a short transport length for enhanced permeability. In this work, a polymer precursor was dip-coated onto porous alumina hollow fibers, followed by pyrolysis to yield composite hollow fiber membranes with a very thin (∼2 μm), selective CMS layer. Using the composite membranes, xylene mixtures were separated by organic solvent reverse osmosis mode, and enhanced flux of the composite membrane (up to 10 times) was obtained compared to other CMS membranes. It is expected that organic liquid mixtures can be separated at a lower cost through membranes than through the conventional thermal process.},\n\tnumber = {27},\n\turldate = {2026-01-25},\n\tjournal = {Industrial \\& Engineering Chemistry Research},\n\tpublisher = {American Chemical Society},\n\tauthor = {Jang, Min-Jun and Seo, Hyeokjun and Koh, Dong-Yeun},\n\tmonth = jul,\n\tyear = {2024},\n\tpages = {12166--12176},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Sustainable Isopropyl Alcohol Recovery via Data-Driven, Active-Learning Optimization of Vacuum Membrane Distillation.\n \n \n \n \n\n\n \n Park, J.; Cheon, M.; Park, S.; Lee, J. H.; and Koh, D.\n\n\n \n\n\n\n ACS Sustainable Chemistry & Engineering, 12(31): 11510–11519. August 2024.\n \n\n\n\n
\n\n\n\n \n \n $\"Sustainable$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{park_sustainable_2024,\n\ttitle = {Sustainable {Isopropyl} {Alcohol} {Recovery} via {Data}-{Driven}, {Active}-{Learning} {Optimization} of {Vacuum} {Membrane} {Distillation}},\n\tvolume = {12},\n\turl = {https://doi.org/10.1021/acssuschemeng.4c01285},\n\tdoi = {10.1021/acssuschemeng.4c01285},\n\tabstract = {The need for separation and recovering solvents from industrial byproducts is critical, given their environmental and economic impact. This study explores the feasibility of energy-efficient vacuum membrane distillation (VMD) using polypropylene hollow fiber membranes to recover and reuse isopropyl alcohol (IPA) from wastewater. Notably, this study pioneers the utilization of active learning-based Bayesian optimization (BO) to optimize the complex, multiobjective, and constrained VMD process. BO is an effective method for global optimization in black-box functions, particularly when data is limited and difficult to acquire. It creates a data-driven surrogate model (e.g., Gaussian process model) due to the shortage of data and the need for uncertainty quantification. The data-driven approach by BO efficiently reduces the number of necessary experiments, demonstrating the value of active learning in sustainable chemical processes. The research focuses on the data-driven optimization of key process variables in VMD required in scale-up operation, including the feed solution temperature, lumen-side membrane pressure, solution flow rate, and IPA concentration. To assess the long-term viability of the optimal conditions identified by BO, particularly given the risk of membrane pore wetting, we also evaluate the long-term stability of the optimized process. This study bridges the gap between fundamental research and practical application, offering a robust foundation for using advanced optimization techniques in the separations field. It holds promise for broad industrial applicability, providing both environmental and economic benefits.},\n\tnumber = {31},\n\turldate = {2026-01-25},\n\tjournal = {ACS Sustainable Chemistry \\& Engineering},\n\tpublisher = {American Chemical Society},\n\tauthor = {Park, Jimin and Cheon, Mujin and Park, Sanghyeon and Lee, Jay H. and Koh, Dong-Yeun},\n\tmonth = aug,\n\tyear = {2024},\n\tpages = {11510--11519},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Efficient extraction of hydrogen fluoride using hollow fiber membrane contactors with the aid of active-learning.\n \n \n \n \n\n\n \n Park, J.; Cheon, M.; Kim, D. I.; Park, D.; Lee, J. H.; and Koh, D.\n\n\n \n\n\n\n AIChE Journal, 70(11): e18546. 2024.\n _eprint: https://aiche.onlinelibrary.wiley.com/doi/pdf/10.1002/aic.18546\n\n\n\n
\n\n\n\n \n \n $\"Efficient$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{park_efficient_2024,\n\ttitle = {Efficient extraction of hydrogen fluoride using hollow fiber membrane contactors with the aid of active-learning},\n\tvolume = {70},\n\tissn = {1547-5905},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/aic.18546},\n\tdoi = {10.1002/aic.18546},\n\tabstract = {This study presents a sustainable approach to extracting hydrogen fluoride (HF) from wastewater using hollow fiber membrane contactors. HF, a widely used yet hazardous chemical, requires efficient separation techniques due to its environmental and health concerns. Our research compared two operational modes, vacuum mode and liquid–liquid extraction mode, revealing the latter as more efficient for HF separation. Notably, this study introduces a novel aspect by employing a data-driven decision-making method, Bayesian optimization (BO) for process optimization of the liquid–liquid extraction mode, aiming to maximize HF removal efficiency at low experimental costs. Subsequent validation through a 96-h experimental run confirms the suitability of the optimized conditions for industrial applications. This study not only demonstrates an efficient HF separation process using hollow fiber membrane contactors but also establishes a new standard for complex industrial process optimization.},\n\tlanguage = {en},\n\tnumber = {11},\n\turldate = {2026-01-25},\n\tjournal = {AIChE Journal},\n\tauthor = {Park, Jimin and Cheon, Mujin and Kim, David Inhyuk and Park, Daeseon and Lee, Jay H. and Koh, Dong-Yeun},\n\tyear = {2024},\n\tnote = {\\_eprint: https://aiche.onlinelibrary.wiley.com/doi/pdf/10.1002/aic.18546},\n\tkeywords = {Bayesian optimization, active learning, data-driven optimization, hollow fiber membrane contactors, hydrogen fluoride},\n\tpages = {e18546},\n}\n\n\n\n\n\n\n\n

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\n \n 2023\n \n \n (4)\n \n \n

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\n \n\n \n \n \n \n \n \n Bottom-up synthesis of two-dimensional carbon with vertically aligned ordered micropores for ultrafast nanofiltration.\n \n \n \n \n\n\n \n Kim, C.; Koh, D.; Lee, Y.; Choi, J.; Cho, H. S.; and Choi, M.\n\n\n \n\n\n\n Science Advances, 9(6): eade7871. February 2023.\n \n\n\n\n
\n\n\n\n \n \n $\"Bottom-up$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{kim_bottom-up_2023,\n\ttitle = {Bottom-up synthesis of two-dimensional carbon with vertically aligned ordered micropores for ultrafast nanofiltration},\n\tvolume = {9},\n\turl = {https://www.science.org/doi/10.1126/sciadv.ade7871},\n\tdoi = {10.1126/sciadv.ade7871},\n\tabstract = {Two-dimensional (2D) carbon materials perforated with uniform micropores are considered ideal building blocks to fabricate advanced membranes for molecular separation and energy storage devices with high rate capabilities. However, creating high-density uniform micropores in 2D carbon using conventional perforation methods remains a formidable challenge. Here, we report a zeolite-templated bottom-up synthesis of ordered microporous 2D carbon. Through rational analysis of 255 zeolite structures, we find that the IWV zeolite having large 2D microporous channels and aluminosilicate compositions can serve as an ideal template for carbon replication. The resulting carbon is made of an extremely thin polyaromatic backbone and contains well-defined vertically aligned micropores (0.69 nm in diameter). Its areal pore density (0.70 nm−2) is considerably greater than that of porous graphene ({\\textless}0.05 nm−2) prepared using top-down perforation methods. The isoporous membrane fabricated by assembling the exfoliated 2D carbon nanosheets exhibits outstanding permeance and molecular sieving properties in organic solvent nanofiltration.},\n\tnumber = {6},\n\turldate = {2026-01-25},\n\tjournal = {Science Advances},\n\tpublisher = {American Association for the Advancement of Science},\n\tauthor = {Kim, Chaehoon and Koh, Dong-Yeun and Lee, Yongjin and Choi, Jihoon and Cho, Hae Sung and Choi, Minkee},\n\tmonth = feb,\n\tyear = {2023},\n\tpages = {eade7871},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Highly Oxidation-Resistant and Self-Healable MXene-Based Hydrogels for Wearable Strain Sensor.\n \n \n \n \n\n\n \n Chae, A.; Murali, G.; Lee, S.; Gwak, J.; Kim, S. J.; Jeong, Y. J.; Kang, H.; Park, S.; Lee, A. S.; Koh, D.; In, I.; and Park, S.\n\n\n \n\n\n\n Advanced Functional Materials, 33(24): 2213382. 2023.\n _eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/adfm.202213382\n\n\n\n
\n\n\n\n \n \n $\"Highly$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{chae_highly_2023,\n\ttitle = {Highly {Oxidation}-{Resistant} and {Self}-{Healable} {MXene}-{Based} {Hydrogels} for {Wearable} {Strain} {Sensor}},\n\tvolume = {33},\n\tcopyright = {© 2023 Wiley-VCH GmbH},\n\tissn = {1616-3028},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.202213382},\n\tdoi = {10.1002/adfm.202213382},\n\tabstract = {Very recently, MXene-based wearable hydrogels have emerged as promising candidates for epidermal sensors due to their tissue-like softness and unique electrical and mechanical properties. However, it remains a challenge to achieve MXene-based hydrogels with reliable sensing performance and prolonged service life, because MXene inevitably oxidizes in water-containing system of the hydrogels. Herein, catechol-functionalized poly(vinyl alcohol) (PVA-CA)-based hydrogels is proposed to inhibit the oxidation of MXene, leading to rapid self-healing and superior strain sensing behaviors. Sufficient interaction of hydrophobic catechol groups with the MXene surface reduces the oxidation-accessible sites in the MXene for reaction with water and eventually suppresses the oxidation of MXene in the hydrogel. Furthermore, the PVA-CA-MXene hydrogel is demonstrated for use as a strain sensor for real-time motion monitoring, such as detecting subtle human motions and handwriting. The signals of PVA-CA-MXene hydrogel sensor can be accurately classified using deep learning models.},\n\tlanguage = {en},\n\tnumber = {24},\n\turldate = {2026-01-25},\n\tjournal = {Advanced Functional Materials},\n\tauthor = {Chae, Ari and Murali, G. and Lee, Seul-Yi and Gwak, Jeonghwan and Kim, Seon Joon and Jeong, Yong Jin and Kang, Hansol and Park, Seongmin and Lee, Albert S. and Koh, Dong-Yeun and In, Insik and Park, Soo-Jin},\n\tyear = {2023},\n\tnote = {\\_eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/adfm.202213382},\n\tkeywords = {MXenes, deep learning, hydrogels, oxidation, poly(vinyl alcohol), sensors},\n\tpages = {2213382},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Interfacial synthesis: a scalable fabrication method of two-dimensional membranes.\n \n \n \n \n\n\n \n Park, J.; Hwang, Y.; and Koh, D.\n\n\n \n\n\n\n Current Opinion in Chemical Engineering, 40: 100903. June 2023.\n \n\n\n\n
\n\n\n\n \n \n $\"Interfacial$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{park_interfacial_2023,\n\ttitle = {Interfacial synthesis: a scalable fabrication method of two-dimensional membranes},\n\tvolume = {40},\n\tissn = {2211-3398},\n\tshorttitle = {Interfacial synthesis},\n\turl = {https://www.sciencedirect.com/science/article/pii/S2211339823000072},\n\tdoi = {10.1016/j.coche.2023.100903},\n\tabstract = {As two-dimensional (2D) materials have been gathering interest owing to their characteristic properties, diverse methods to synthesize 2D materials have been studied. However, when it comes to the fabrication of 2D membranes, there are still critical challenges related to the scalability and homogeneity of the membranes. To overcome these issues, support-mediated interfacial synthesis has been suggested as a scalable fabrication method. Among diverse interfaces between different phases or substances, the method utilizing the liquid/liquid interface where the sharp interface is formed between two immiscible solvents will be explored. In this review, 2D covalent–organic framework and 2D metal–organic framework membranes fabricated at the liquid/liquid interfaces via support-mediated interfacial synthesis will be discussed. Finally, perspectives of this method on the aspect of scale-up will be investigated.},\n\turldate = {2026-01-25},\n\tjournal = {Current Opinion in Chemical Engineering},\n\tauthor = {Park, Jimin and Hwang, Young-Eun and Koh, Dong-Yeun},\n\tmonth = jun,\n\tyear = {2023},\n\tpages = {100903},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Pervaporation dehydration of ethylene glycol/water mixture via hydrophilic polymer of intrinsic microporosity (PIM) derivatives.\n \n \n \n \n\n\n \n Oh, B.; Kim, K.; Kwon, Y.; Park, Y.; Park, H.; and Koh, D.\n\n\n \n\n\n\n Journal of Membrane Science, 680: 121707. August 2023.\n \n\n\n\n
\n\n\n\n \n \n $\"Pervaporation$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{oh_pervaporation_2023,\n\ttitle = {Pervaporation dehydration of ethylene glycol/water mixture via hydrophilic polymer of intrinsic microporosity ({PIM}) derivatives},\n\tvolume = {680},\n\tissn = {0376-7388},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0376738823003630},\n\tdoi = {10.1016/j.memsci.2023.121707},\n\tabstract = {The chemical process for manufacturing raw materials requires a substantial amount of organic solvent, and it is important to recover the solvent overused during the reaction. This work uses membrane pervaporation to recover ethylene glycol by dehydrating water from a mixture of ethylene glycol (EG) and water. As a feasible membrane material suitable for the dehydration of lean-EG/water (with a water content of 70–95 wt\\%), we suggest two hydrophilic derivatives from the polymer of intrinsic microporosity (PIM-1). Two PIM-derivatives, amidoxime-functionalized PIM (AO-PIM) and 2,4-diamino-1,3,5-triazine-functionalized PIM (DAT-PIM), were effectively produced through hydrophilic functional group modification and retained their intrinsic microporosity based on a rigid and highly twisted polymer backbone. The PIM-derivatives showed increased water sorption capacity, resulting in tenfold greater water permeability of both PIM-derivative membranes than pure PIM-1. In addition, the modified membranes retained a water content of 99.9\\% in the permeate. This study demonstrated a simple method for modifying suitable dehydration materials while maintaining the original polymer's structural quality.},\n\turldate = {2026-01-25},\n\tjournal = {Journal of Membrane Science},\n\tauthor = {Oh, Banseok and Kim, Kyunam and Kwon, YongSung and Park, You-In and Park, Hosik and Koh, Dong-Yeun},\n\tmonth = aug,\n\tyear = {2023},\n\tkeywords = {Dehydration, Ethylene glycol, Hydrophilicity, PIM-1, Pervaporation},\n\tpages = {121707},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n 2022\n \n \n (8)\n \n \n

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\n \n\n \n \n \n \n \n \n All-Nanoporous fiber sorbent with a Non-Sacrificial polymer of intrinsic microporosity (PIM) matrix.\n \n \n \n \n\n\n \n Kim, K.; Hwang, Y.; Lee, Y. H.; Park, S.; Kim, D.; and Koh, D.\n\n\n \n\n\n\n Separation and Purification Technology, 289: 120639. May 2022.\n \n\n\n\n
\n\n\n\n \n \n $\"All-Nanoporous$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{kim_all-nanoporous_2022,\n\ttitle = {All-{Nanoporous} fiber sorbent with a {Non}-{Sacrificial} polymer of intrinsic microporosity ({PIM}) matrix},\n\tvolume = {289},\n\tissn = {1383-5866},\n\turl = {https://www.sciencedirect.com/science/article/pii/S138358662200199X},\n\tdoi = {10.1016/j.seppur.2022.120639},\n\tabstract = {Microporous materials are highlighted with regard to low-energy and low-carbon adsorptive separation processes, where the interests have evolved simple microporous powders into a structured sorbent platform of fiber sorbent to tackle the technical challenges of large-scale applications. However, the challenge of sorption capacity loss in a limited footprint due to the addition of non-adsorbing binder materials still remained. Polymers of intrinsic microporosity (PIMs) are promising advanced materials for gas separation and capture due to their unique textural properties and processability. This article reports an efficient but straightforward blend of organic and inorganic materials, PIM-1 and zeolite NaY, forming “all-nanoporous” fiber sorbents. The combination of the two nanoporous materials resulted in a structured platform for a sorption-based separation system for volatile organic compounds (VOCs). It is differentiated from other sorption platforms as it presents minimal volumetric sorption loss from the “binder” material by allowing the microporous substrate to work as a VOC sorbent. The “all-nanoporous” fiber sorbent of NaY/PIM-1 shows feasible sorption performance capabilities under both dry and humid conditions while maintaining a minimal pressure drop due to its hierarchical porous structure.},\n\turldate = {2026-01-25},\n\tjournal = {Separation and Purification Technology},\n\tauthor = {Kim, Kyunam and Hwang, Young-Eun and Lee, Young Hun and Park, Seong-Jun and Kim, Daeok and Koh, Dong-Yeun},\n\tmonth = may,\n\tyear = {2022},\n\tkeywords = {Fiber Sorbent, Polymer of Intrinsic Microporosity, Structured Sorbent, Volatile organic compounds, Zeolite},\n\tpages = {120639},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Sustainable building materials employing solid diamines as CO2 sorbents.\n \n \n \n \n\n\n \n Lee, S.; Ahn, Y.; and Koh, D.\n\n\n \n\n\n\n Korean Journal of Chemical Engineering, 39(8): 1975–1980. August 2022.\n \n\n\n\n
\n\n\n\n \n \n $\"Sustainable$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{lee_sustainable_2022,\n\ttitle = {Sustainable building materials employing solid diamines as {CO2} sorbents},\n\tvolume = {39},\n\tissn = {1975-7220},\n\turl = {https://doi.org/10.1007/s11814-022-1061-z},\n\tdoi = {10.1007/s11814-022-1061-z},\n\tabstract = {The storage of large quantities of CO2 in a chemically-bonded framework is a key factor in establishing an energy efficient and environmentally sound society. The solvent scrubbing process provides an economically feasible way to capture CO2 industrially. However, it suffers from inherent problems such as corrosion/leakage problems, difficulty with the regeneration process, and potential environmental issues. In this regard, the solid adsorbent is deemed as a next-generation carbon-capture platform. However, most reported materials involve complex and expensive synthesis processes, hampering their practical use in the field. Inspired by the concept of solid-supported amines and by the reversible sorption of CO2 in amine solutions, in this paper, we assess the CO2 sorption performance of raw diamine solid molecule of p-phenylenediamine (pPD), which could be coupled with construction materials to meet the design construction standards for sustainable buildings. CO2 sorption induced structural transformation of pPD and morphology-change induced enhancement of CO2 sorption kinetics are presented.},\n\tlanguage = {en},\n\tnumber = {8},\n\turldate = {2026-01-25},\n\tjournal = {Korean Journal of Chemical Engineering},\n\tauthor = {Lee, Suk and Ahn, Yun-Ho and Koh, Dong-Yeun},\n\tmonth = aug,\n\tyear = {2022},\n\tkeywords = {Building Materials, CO2 Sorbing Materials, para-Phenylenediamine},\n\tpages = {1975--1980},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Homochiral Metal-Organic Framework Based Mixed Matrix Membrane for Chiral Resolution.\n \n \n \n \n\n\n \n Choi, H.; and Koh, D.\n\n\n \n\n\n\n Membranes, 12(4): 357. April 2022.\n \n\n\n\n
\n\n\n\n \n \n $\"Homochiral$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{choi_homochiral_2022,\n\ttitle = {Homochiral {Metal}-{Organic} {Framework} {Based} {Mixed} {Matrix} {Membrane} for {Chiral} {Resolution}},\n\tvolume = {12},\n\tcopyright = {http://creativecommons.org/licenses/by/3.0/},\n\tissn = {2077-0375},\n\turl = {https://www.mdpi.com/2077-0375/12/4/357},\n\tdoi = {10.3390/membranes12040357},\n\tabstract = {Efficient separation of enantiomers is critical in the chemical, pharmaceutical, and food industries. However, conventional separation methods, such as chromatography, crystallization, and enzymatic kinetic resolution, require high energy costs and specific reaction conditions for the efficient purification of one enantiomer. In contrast, membrane-based processes are continuous processes performed with less energy than conventional separation processes. Enantioselective polymer membranes have been developed for the chiral resolution of pharmaceuticals; however, it is difficult to generate sufficient enantiomeric excess (ee) with polymer membranes. In this work, a homochiral filler of L-His-ZIF-8 was synthesized by the ligand substitution method and mixed with polyamide(imide) (i.e., Torlon®) to fabricate an enantioselective mixed-matrix membrane (MMM). The enantio-selective separation of R-1-phenylethanol over S-1-phenylethanol was demonstrated with a 25 wt\\% loaded L-His-ZIF-8/Torlon® MMM in an organic solvent nanofiltration (OSN) mode.},\n\tlanguage = {en},\n\tnumber = {4},\n\turldate = {2026-01-25},\n\tjournal = {Membranes},\n\tpublisher = {Multidisciplinary Digital Publishing Institute},\n\tauthor = {Choi, Hwa-Jin and Koh, Dong-Yeun},\n\tmonth = apr,\n\tyear = {2022},\n\tkeywords = {Metal-Organic Framework, Mixed Matrix Membrane, Torlon®, enantioselectivity},\n\tpages = {357},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Modulation of Solvation Structure and Electrode Work Function by an Ultrathin Layer of Polymer of Intrinsic Microporosity in Zinc Ion Batteries (Small 25/2022).\n \n \n \n \n\n\n \n Heo, J.; Hwang, Y.; Doo, G.; Jung, J.; Shin, K.; Koh, D.; and Kim, H.\n\n\n \n\n\n\n Small, 18(25): 2270135. 2022.\n _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/smll.202270135\n\n\n\n
\n\n\n\n \n \n $\"Modulation$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{heo_modulation_2022,\n\ttitle = {Modulation of {Solvation} {Structure} and {Electrode} {Work} {Function} by an {Ultrathin} {Layer} of {Polymer} of {Intrinsic} {Microporosity} in {Zinc} {Ion} {Batteries} ({Small} 25/2022)},\n\tvolume = {18},\n\tcopyright = {© 2022 Wiley-VCH GmbH},\n\tissn = {1613-6829},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.202270135},\n\tdoi = {10.1002/smll.202270135},\n\tabstract = {Zinc Ion Batteries In article number 2201163, Dong-Yeun Koh, Hee-Tak Kim, and co-workers report polymer of intrinsic microporosity (PIM-1) as an ion regulating layer and an interface modulator which can change the solvation structure of Zn2+ ion and work function of Zn metal. As a result, PIM-1 enhances the reaction kinetics of the Zn redox reaction and promotes a uniform Zn deposition/dissolution process.},\n\tnumber = {25},\n\turldate = {2026-01-25},\n\tjournal = {Small},\n\tauthor = {Heo, Jiyun and Hwang, Young-Eun and Doo, Gisu and Jung, Jinkwan and Shin, Kyungjae and Koh, Dong-Yeun and Kim, Hee-Tak},\n\tyear = {2022},\n\tnote = {\\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/smll.202270135},\n\tkeywords = {polymer of intrinsic microporosity, solvation structure, work function, zinc ion batteries},\n\tpages = {2270135},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Electron-mediated control of nanoporosity for targeted molecular separation in carbon membranes.\n \n \n \n \n\n\n \n Oh, B.; Seo, H.; Choi, J.; Lee, S.; and Koh, D.\n\n\n \n\n\n\n Nature Communications, 13(1): 4972. August 2022.\n \n\n\n\n
\n\n\n\n \n \n $\"Electron-mediated$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{oh_electron-mediated_2022,\n\ttitle = {Electron-mediated control of nanoporosity for targeted molecular separation in carbon membranes},\n\tvolume = {13},\n\tcopyright = {2022 The Author(s)},\n\tissn = {2041-1723},\n\turl = {https://www.nature.com/articles/s41467-022-32703-4},\n\tdoi = {10.1038/s41467-022-32703-4},\n\tabstract = {Carbon molecular sieve (CMS) membranes are considered game-changers to overcome the challenges that conventional polymeric membranes face. However, CMS membranes also confront a challenge in successfully separating extremely similar-sized molecules. In this article, high-precision tuning of the microstructure of CMS membranes is proposed by controlled electron irradiation for the separation of molecules with size differences less than 0.05 nm. Fitting CMS membranes for targeted molecular separation can be accomplished by irradiation dosage control, resulting in highly-efficient C2H4/C2H6 separation for low dosages (∼250kGy, with selectivity ∼14) and ultra-selective H2/CO2 separation for high dosages (1000∼2000kGy with selectivity ∼80).The electron irradiated CMS also exhibits highly stabilized permeability and selectivity for long-term operation than the pristine CMS, which suffers from significant performance degradation due to physical aging. This study successfully demonstrates electron irradiation as a possible way to construct “designer” nanoporous carbon membranes out of the standard components mostly confined to pyrolysis conditions.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2026-01-25},\n\tjournal = {Nature Communications},\n\tpublisher = {Nature Publishing Group},\n\tauthor = {Oh, Banseok and Seo, Hyeokjun and Choi, Jihoon and Lee, Sunggyu and Koh, Dong-Yeun},\n\tmonth = aug,\n\tyear = {2022},\n\tkeywords = {Chemical engineering, Physical chemistry, Surface chemistry},\n\tpages = {4972},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Refining petroleum with membranes.\n \n \n \n \n\n\n \n Seo, H.; and Koh, D.\n\n\n \n\n\n\n Science, 376(6597): 1053–1054. June 2022.\n \n\n\n\n
\n\n\n\n \n \n $\"Refining$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{seo_refining_2022,\n\ttitle = {Refining petroleum with membranes},\n\tvolume = {376},\n\turl = {https://www.science.org/doi/10.1126/science.abq3186},\n\tdoi = {10.1126/science.abq3186},\n\tnumber = {6597},\n\turldate = {2026-01-25},\n\tjournal = {Science},\n\tpublisher = {American Association for the Advancement of Science},\n\tauthor = {Seo, Hyeokjun and Koh, Dong-Yeun},\n\tmonth = jun,\n\tyear = {2022},\n\tpages = {1053--1054},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Highly efficient bromine capture and storage using N-containing porous organic cages.\n \n \n \n \n\n\n \n Lee, S.; Kevlishvili, I.; Kulik, H. J.; Kim, H.; Chung, Y. G.; and Koh, D.\n\n\n \n\n\n\n Journal of Materials Chemistry A, 10(46): 24802–24812. November 2022.\n \n\n\n\n
\n\n\n\n \n \n $\"Highly$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{lee_highly_2022,\n\ttitle = {Highly efficient bromine capture and storage using {N}-containing porous organic cages},\n\tvolume = {10},\n\tissn = {2050-7496},\n\turl = {https://pubs.rsc.org/en/content/articlelanding/2022/ta/d2ta05420e},\n\tdoi = {10.1039/D2TA05420E},\n\tabstract = {Highly volatile and toxic bromine (Br2) molecules can be utilized safely in various chemical processes when coupled with efficient separation systems. Herein, we present two different N-containing porous organic cages (POCs), covalent cage 3-R (CC3-R) and formaldehyde tied-reduced covalent cage 3 (FT-RCC3), for vapor Br2 capture under ambient conditions. They show outstanding sorption capacities (11.02 mmol g−1 and 11.64 mmol g−1, respectively) compared with previously reported adsorbents. Reversibility of the Br2 sorption process has been elucidated experimentally and computationally by identifying bromine species adsorbed at POCs and calculating their binding energies. The strong charge-transfer interactions between adsorbed Br2 and abundant N atomic sites of the host cages led to the dominant formation of polybromide species (Br3− and Br5−). Further host–guest interaction between POCs and polybromides determined the reversibility of the Br2 sorption process—showing partially reversible ({\\textgreater}70\\% recovery) behavior for CC3-R and irreversible ({\\textless}10\\% recovery) behavior for FT-RCC3, both of which were affected by the chemical and structural nature of different POCs. DFT calculations further indicate that the formation of carbocationic species (Br3− and Br5−) and HBr is energetically favorable within the cage, which is in good agreement with the experimental results. This work demonstrates that strong host–guest interactions are essential for highly efficient Br2 capture and storage performance.},\n\tlanguage = {en},\n\tnumber = {46},\n\turldate = {2026-01-25},\n\tjournal = {Journal of Materials Chemistry A},\n\tpublisher = {The Royal Society of Chemistry},\n\tauthor = {Lee, Sunggyu and Kevlishvili, Ilia and Kulik, Heather J. and Kim, Hee-Tak and Chung, Yongchul G. and Koh, Dong-Yeun},\n\tmonth = nov,\n\tyear = {2022},\n\tpages = {24802--24812},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Tunable Ti3C2Tx MXene-Derived TiO2 Nanocrystals at Controlled pH and Temperature.\n \n \n \n \n\n\n \n Chae, A.; Doo, S.; Kim, D.; Ko, T. Y.; Oh, T.; Kim, S. J.; Koh, D.; and Koo, C. M.\n\n\n \n\n\n\n Langmuir, 38(41): 12657–12665. October 2022.\n \n\n\n\n
\n\n\n\n \n \n $\"Tunable$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{chae_tunable_2022,\n\ttitle = {Tunable {Ti3C2Tx} {MXene}-{Derived} {TiO2} {Nanocrystals} at {Controlled} {pH} and {Temperature}},\n\tvolume = {38},\n\tissn = {0743-7463},\n\turl = {https://doi.org/10.1021/acs.langmuir.2c02110},\n\tdoi = {10.1021/acs.langmuir.2c02110},\n\tabstract = {While two-dimensional (2D) Ti3C2Tx MXene in aqueous dispersions spontaneously oxidizes into titanium dioxide (TiO2) nanocrystals, the crystallization mechanism has not been comprehensively understood and the resultant crystal structures are not controlled among three representative polymorphs: anatase, rutile, and brookite. In this study, such control on the lattice structures and domain sizes of the MXene-derived TiO2 crystallites is demonstrated by means of the oxidation conditions, pH, and temperature (3.0–11.0 and 20–100 °C, respectively). It is observed that the formation of anatase phase is preferred against rutile phase in more basic and hotter oxidizing solutions, and even 100\\% anatase can be obtained at pH 11.0 and 100 °C. At lower pH and temperature, the portion of rutile phase increases such that it reaches ∼70\\% at pH 3 and 20 °C. Under certain circumstances, small portion of brookite phase is also observed. Smaller domain sizes of both anatase and rutile phases are observed in more basic oxidizing solutions and at lower temperatures. Based on these experimental results, we propose the crystallization mechanism in which the oxidative dissociation of Ti3C2Tx first produces Ti ions as the intermediate state, and they bind to abundant oxygen in the aqueous dispersions, and nucleate and crystallize into TiO2.},\n\tnumber = {41},\n\turldate = {2026-01-25},\n\tjournal = {Langmuir},\n\tpublisher = {American Chemical Society},\n\tauthor = {Chae, Ari and Doo, Sehyun and Kim, Daesin and Ko, Tae Yun and Oh, Taegon and Kim, Seon Joon and Koh, Dong-Yeun and Koo, Chong Min},\n\tmonth = oct,\n\tyear = {2022},\n\tpages = {12657--12665},\n}\n\n\n\n\n\n\n\n

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\n \n 2021\n \n \n (6)\n \n \n

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\n \n\n \n \n \n \n \n \n Polyacrylonitrile-based carbon nanofibers as a matrix for laser desorption/ionization time-of-flight mass spectrometric analysis of small molecules under both positive and negative ionization modes.\n \n \n \n \n\n\n \n Chae, A.; Lee, G.; Koh, D.; Yang, C.; Lee, S.; and Kim, Y.\n\n\n \n\n\n\n Analytical and Bioanalytical Chemistry, 413(4): 1193–1202. February 2021.\n \n\n\n\n
\n\n\n\n \n \n $\"Polyacrylonitrile-based$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{chae_polyacrylonitrile-based_2021,\n\ttitle = {Polyacrylonitrile-based carbon nanofibers as a matrix for laser desorption/ionization time-of-flight mass spectrometric analysis of small molecules under both positive and negative ionization modes},\n\tvolume = {413},\n\tissn = {1618-2650},\n\turl = {https://doi.org/10.1007/s00216-020-03083-9},\n\tdoi = {10.1007/s00216-020-03083-9},\n\tabstract = {Carbon fiber (CNF), prepared by carbonization of electrospun polyacrylonitrile (PAN) fibers, is systematically investigated as a mediator to replace conventional organic matrices for matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-MS). CNF exhibits a high salt tolerance, sensitivity, and resolution for organic matrix-free laser desorption/ionization time-of-flight mass spectrometry (LDI-MS) analysis of various analytes under both positive and negative ionization modes. Especially, saccharides, a neutral molecule having low negative ionization efficiency, are successfully detected with CNF. Taken together, this study clearly demonstrates CNF is a promising material to develop an efficient and universal platform for LDI-MS analysis regardless of preferential ionization modes of analytes.},\n\tlanguage = {en},\n\tnumber = {4},\n\turldate = {2026-01-27},\n\tjournal = {Analytical and Bioanalytical Chemistry},\n\tauthor = {Chae, Ari and Lee, Gwanwon and Koh, Dong-Yeun and Yang, Cheol-Min and Lee, Sungho and Kim, Young-Kwan},\n\tmonth = feb,\n\tyear = {2021},\n\tkeywords = {Carbon nanofiber, Carbonization, Laser desorption/ionization, Mass spectrometry, Saccharide},\n\tpages = {1193--1202},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Enantioselective Mixed Matrix Membranes for Chiral Resolution.\n \n \n \n \n\n\n \n Choi, H.; Ahn, Y.; and Koh, D.\n\n\n \n\n\n\n Membranes, 11(4): 279. April 2021.\n \n\n\n\n
\n\n\n\n \n \n $\"Enantioselective$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{choi_enantioselective_2021,\n\ttitle = {Enantioselective {Mixed} {Matrix} {Membranes} for {Chiral} {Resolution}},\n\tvolume = {11},\n\tcopyright = {http://creativecommons.org/licenses/by/3.0/},\n\tissn = {2077-0375},\n\turl = {https://www.mdpi.com/2077-0375/11/4/279},\n\tdoi = {10.3390/membranes11040279},\n\tabstract = {Most pharmaceuticals are stereoisomers that each enantiomer shows dramatically different biological activity. Therefore, the production of optically pure chemicals through sustainable and energy-efficient technology is one of the main objectives in the pharmaceutical industry. Membrane-based separation is a continuous process performed on a large scale that uses far less energy than the conventional thermal separation process. Enantioselective polymer membranes have been developed for chiral resolution of pharmaceuticals; however, it is difficult to generate sufficient enantiomeric excess (ee) with conventional polymers. This article describes a chiral resolution strategy using a composite structure of mixed matrix membrane that employs chiral fillers. We discuss several enantioselective fillers, including metal-organic frameworks (MOFs), covalent organic frameworks (COFs), zeolites, porous organic cages (POCs), and their potential use as chiral fillers in mixed matrix membranes. State-of-the-art enantioselective mixed matrix membranes (MMMs) and the future design consideration for highly efficient enantioselective MMMs are discussed.},\n\tlanguage = {en},\n\tnumber = {4},\n\turldate = {2026-01-27},\n\tjournal = {Membranes},\n\tpublisher = {Multidisciplinary Digital Publishing Institute},\n\tauthor = {Choi, Hwa-Jin and Ahn, Yun-Ho and Koh, Dong-Yeun},\n\tmonth = apr,\n\tyear = {2021},\n\tkeywords = {chiral resolution, diffusion, enantioselective process, molecular interaction, racemic mixture},\n\tpages = {279},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Mechanism and Kinetics of Oxidation Reaction of Aqueous Ti3C2Tx Suspensions at Different pHs and Temperatures.\n \n \n \n \n\n\n \n Doo, S.; Chae, A.; Kim, D.; Oh, T.; Ko, T. Y.; Kim, S. J.; Koh, D.; and Koo, C. M.\n\n\n \n\n\n\n ACS Applied Materials & Interfaces, 13(19): 22855–22865. May 2021.\n \n\n\n\n
\n\n\n\n \n \n $\"Mechanism$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 2 downloads\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{doo_mechanism_2021,\n\ttitle = {Mechanism and {Kinetics} of {Oxidation} {Reaction} of {Aqueous} {Ti3C2Tx} {Suspensions} at {Different} {pHs} and {Temperatures}},\n\tvolume = {13},\n\tissn = {1944-8244},\n\turl = {https://doi.org/10.1021/acsami.1c04663},\n\tdoi = {10.1021/acsami.1c04663},\n\tabstract = {Understanding the oxidation reaction of aqueous Ti3C2Tx MXene suspensions is very important for fostering fundamental academic studies as well as widespread industrial applications. Herein, we investigated the mechanism and kinetics of the oxidation reaction of aqueous Ti3C2Tx suspensions at various pH and temperature conditions. Through comprehensive analysis, the mechanism of the chemical oxidative degradation of aqueous Ti3C2Tx colloids was established. Chemical oxidation produces solid products such as TiO2 and amorphous carbon as well as various gaseous species including CH4, CO, CO2, and HF. Additionally, our comprehensive kinetic study proposes that aqueous Ti3C2Tx dispersions are degraded via an acid-catalyzed oxidation reaction, where, under acidic conditions, the protonation of the hydroxyl terminal groups on the Ti3C2Tx flakes induces electron localization on titanium atoms and accelerates their oxidation reaction. In contrast, under basic conditions, the electrostatically alkali-metalized hydroxyl intermediates forming a bulky solvent cage results in less electron localization on titanium atoms, and thus retards their oxidative degradation.},\n\tnumber = {19},\n\turldate = {2026-01-27},\n\tjournal = {ACS Applied Materials \\& Interfaces},\n\tpublisher = {American Chemical Society},\n\tauthor = {Doo, Sehyun and Chae, Ari and Kim, Daesin and Oh, Taegon and Ko, Tae Yun and Kim, Seon Joon and Koh, Dong-Yeun and Koo, Chong Min},\n\tmonth = may,\n\tyear = {2021},\n\tpages = {22855--22865},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Controlled Synthesis of Metal–Organic Frameworks in Scalable Open-Porous Contactor for Maximizing Carbon Capture Efficiency.\n \n \n \n \n\n\n \n Lee, Y. H.; Kwon, Y.; Kim, C.; Hwang, Y.; Choi, M.; Park, Y.; Jamal, A.; and Koh, D.\n\n\n \n\n\n\n JACS Au, 1(8): 1198–1207. August 2021.\n \n\n\n\n
\n\n\n\n \n \n $\"Controlled$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{lee_controlled_2021,\n\ttitle = {Controlled {Synthesis} of {Metal}–{Organic} {Frameworks} in {Scalable} {Open}-{Porous} {Contactor} for {Maximizing} {Carbon} {Capture} {Efficiency}},\n\tvolume = {1},\n\turl = {https://doi.org/10.1021/jacsau.1c00068},\n\tdoi = {10.1021/jacsau.1c00068},\n\tabstract = {Metal–organic frameworks (MOFs) are a class of microporous materials that have been highlighted with fast and selective sorption of gas molecules; however, they are at least partially unstable in the scale-up process. Here, we report a rational shaping of MOFs in a scalable architecture of fiber sorbent. The long-standing stability challenge of MOFs was resolved by using stable metal oxide precursors that are subject to controlled surface oxide dissolution-growth chemistry during the Mg-based MOF synthesis. Highly uniform MOF crystals are synthesized along with the open-porous fiber sorbents networks, showing unprecedented cyclic CO2 capacities in both flue gas and direct air capture (DAC) conditions. The same chemistry enables an in situ flow synthesis of Mg-MOF fiber sorbents, providing a scalable pathway for MOF synthesis in an inert condition with minimal handling steps. This modular approach can serve both as a reaction stage for enhanced MOF fiber sorbent synthesis and as a “process-ready” separation device.},\n\tnumber = {8},\n\turldate = {2026-01-27},\n\tjournal = {JACS Au},\n\tpublisher = {American Chemical Society},\n\tauthor = {Lee, Young Hun and Kwon, YongSung and Kim, Chaehoon and Hwang, Young-Eun and Choi, Minkee and Park, YouIn and Jamal, Aqil and Koh, Dong-Yeun},\n\tmonth = aug,\n\tyear = {2021},\n\tpages = {1198--1207},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Shape-Selective Ultramicroporous Carbon Membranes for Sub-0.1 nm Organic Liquid Separation.\n \n \n \n \n\n\n \n Seo, H.; Yoon, S.; Oh, B.; Chung, Y. G.; and Koh, D.\n\n\n \n\n\n\n Advanced Science, 8(17): 2004999. 2021.\n _eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/advs.202004999\n\n\n\n
\n\n\n\n \n \n $\"Shape-Selective$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{seo_shape-selective_2021,\n\ttitle = {Shape-{Selective} {Ultramicroporous} {Carbon} {Membranes} for {Sub}-0.1 nm {Organic} {Liquid} {Separation}},\n\tvolume = {8},\n\tcopyright = {© 2021 The Authors. Advanced Science published by Wiley-VCH GmbH},\n\tissn = {2198-3844},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/advs.202004999},\n\tdoi = {10.1002/advs.202004999},\n\tabstract = {Liquid-phase chemical separations from complex mixtures of hydrocarbon molecules into singular components are large-scale and energy-intensive processes. Membranes with molecular specificity that efficiently separate molecules of similar size and shape can avoid phase changes, thereby reducing the energy intensity of the process. Here, forward osmosis molecular differentiation of hexane isomers through a combination of size- and shape-based separation of molecules is demonstrated. An ultramicroporous carbon membrane produced with 6FDA-polyimides realized the separation of isomers for different shapes of di-branched, mono-branched, and linear molecules. The draw solvents provide the driving force for fractionation of hexane isomers with a sub-0.1 nm size difference at room temperature without liquid-phase pressurization. Such membranes could perform bulk chemical separations of organic liquids to achieve major reductions in the energy intensity of the separation processes.},\n\tlanguage = {en},\n\tnumber = {17},\n\turldate = {2026-01-27},\n\tjournal = {Advanced Science},\n\tauthor = {Seo, Hyeokjun and Yoon, Sunghyun and Oh, Banseok and Chung, Yongchul G. and Koh, Dong-Yeun},\n\tyear = {2021},\n\tnote = {\\_eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/advs.202004999},\n\tkeywords = {nanoporous carbon, organic solvent forward osmosis (OSFO), pore rigidity, shape selectivity, solvent-solvent separation},\n\tpages = {2004999},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Rational Tuning of Ultramicropore Dimensions in MOF-74 for Size-Selective Separation of Light Hydrocarbons.\n \n \n \n \n\n\n \n Suh, B. L.; Hyun, T.; Koh, D.; and Kim, J.\n\n\n \n\n\n\n Chemistry of Materials, 33(19): 7686–7692. October 2021.\n \n\n\n\n
\n\n\n\n \n \n $\"Rational$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{suh_rational_2021,\n\ttitle = {Rational {Tuning} of {Ultramicropore} {Dimensions} in {MOF}-74 for {Size}-{Selective} {Separation} of {Light} {Hydrocarbons}},\n\tvolume = {33},\n\tissn = {0897-4756},\n\turl = {https://doi.org/10.1021/acs.chemmater.1c01657},\n\tdoi = {10.1021/acs.chemmater.1c01657},\n\tabstract = {The separation of light hydrocarbon mixtures is one of the most important yet energy-intensive processes in the petrochemical industry. Solid adsorbent materials could potentially not only lower energy costs but also offer higher efficiency as an alternative means to traditionally energy-intensive separation methods such as distillation, absorption, and extraction. Here, rational augmentation of the metal–organic framework, Mg-MOF-74, was designed in silico to enhance kinetic selectivity of the material, while imposing a minimal reduction in the adsorption working capacities for light hydrocarbons. From the computer-aided design, we synthesized 2,4,6-tri(4-pyridyl)-1,3,5-triazine-inserted Mg-MOF-74 (tpt-Mg-MOF-74) and successfully characterized the structure. This material can kinetically separate ethane/propane with an unprecedented diffusive selectivity of ∼49 owing to its distinctive pore size and provides evidence that metal–organic framework need not sacrifice pore volume for enhanced kinetic selectivity in separation applications.},\n\tnumber = {19},\n\turldate = {2026-01-27},\n\tjournal = {Chemistry of Materials},\n\tpublisher = {American Chemical Society},\n\tauthor = {Suh, Bong Lim and Hyun, Taehoon and Koh, Dong-Yeun and Kim, Jihan},\n\tmonth = oct,\n\tyear = {2021},\n\tpages = {7686--7692},\n}\n\n\n\n\n\n\n\n

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\n \n 2020\n \n \n (6)\n \n \n

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\n \n\n \n \n \n \n \n \n One-step formation of hydrogen clusters in clathrate hydrates stabilized via natural gas blending.\n \n \n \n \n\n\n \n Ahn, Y.; Moon, S.; Koh, D.; Hong, S.; Lee, H.; Lee, J. W.; and Park, Y.\n\n\n \n\n\n\n Energy Storage Materials, 24: 655–661. January 2020.\n \n\n\n\n
\n\n\n\n \n \n $\"One-step$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{ahn_one-step_2020,\n\ttitle = {One-step formation of hydrogen clusters in clathrate hydrates stabilized via natural gas blending},\n\tvolume = {24},\n\tissn = {2405-8297},\n\turl = {https://www.sciencedirect.com/science/article/pii/S2405829719303903},\n\tdoi = {10.1016/j.ensm.2019.06.007},\n\tabstract = {Harvesting energy gases in the nanoporous water-frameworks of clathrate hydrate enables the widespread of hydrogen-based fuels converted from excess solar or wind energy sources (i.e., Power-to-Gas). However, there has always been a critical trade-off between mild formation condition and maximum working capacity. Here we demonstrate the ‘natural gas modulator’ based synthesis that leads to significantly reduced synthesis pressure (PH2≈3 MPa) simultaneously with the formation of hydrogen clusters (up to 3 molecules) in the confined nanoporous cages of clathrate hydrates. Instead of employing hazardous liquid chemicals, clean energy gas of natural gas is used for the first time to multiply load H2 in all cages (512, 51262, and 51264 cages) of hydrogen-natural gas hydrates without any postsynthetic modification (e.g., guest-exchange reaction). This approach minimizes the environmental impact and reduces operation cost since clathrate hydrates do not generate any chemical waste in both synthesis and decomposition process, and hydrogen-natural gas mixture can be also utilized as an energy resource as itself.},\n\turldate = {2026-01-27},\n\tjournal = {Energy Storage Materials},\n\tauthor = {Ahn, Yun-Ho and Moon, Seokyoon and Koh, Dong-Yeun and Hong, Sujin and Lee, Huen and Lee, Jae W. and Park, Youngjune},\n\tmonth = jan,\n\tyear = {2020},\n\tkeywords = {Clathrate hydrates, Gas storage, Gas-phase promoter, Hydrogen-natural gas blends, Inclusion compounds},\n\tpages = {655--661},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Exfoliated MXene as a mediator for efficient laser desorption/ionization mass spectrometry analysis of various analytes.\n \n \n \n \n\n\n \n Chae, A.; Jang, H.; Koh, D.; Yang, C.; and Kim, Y.\n\n\n \n\n\n\n Talanta, 209: 120531. March 2020.\n \n\n\n\n
\n\n\n\n \n \n $\"Exfoliated$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{chae_exfoliated_2020,\n\ttitle = {Exfoliated {MXene} as a mediator for efficient laser desorption/ionization mass spectrometry analysis of various analytes},\n\tvolume = {209},\n\tissn = {0039-9140},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0039914019311646},\n\tdoi = {10.1016/j.talanta.2019.120531},\n\tabstract = {The exfoliated MXene (e-MXene) is systematically investigated as a mediator for laser desorption/ionization time-of-flight mass spectrometry (LDI-MS) analysis. Whereas un-exfoliated MXene has no activity for LDI-MS analysis, the e-MXene presents a high resolution, salt-tolerance and efficiency for LDI-MS analysis of various small molecules regardless of their polarity, aromaticity and molecular weight owing to its physicochemical properties such as high laser energy absorption, electrical conductivity and photothermal conversion. Based on our findings, it is clearly confirmed that e-MXene is a promising material for the development of an efficient platform for LDI-MS analysis of small molecules.},\n\turldate = {2026-01-27},\n\tjournal = {Talanta},\n\tauthor = {Chae, Ari and Jang, Hongje and Koh, Dong-Yeun and Yang, Cheol-Min and Kim, Young-Kwan},\n\tmonth = mar,\n\tyear = {2020},\n\tkeywords = {Exfoliation, Laser desorption ionization, MXene, Mass spectrometry, Metabolite},\n\tpages = {120531},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n CO2 Absorption Using Membrane Contactors: Recent Progress and Future Perspective.\n \n \n \n \n\n\n \n Chuah, C. Y.; Kim, K.; Lee, J.; Koh, D.; and Bae, T.\n\n\n \n\n\n\n Industrial & Engineering Chemistry Research, 59(15): 6773–6794. April 2020.\n \n\n\n\n
\n\n\n\n \n \n $\"CO2$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{chuah_co2_2020,\n\ttitle = {{CO2} {Absorption} {Using} {Membrane} {Contactors}: {Recent} {Progress} and {Future} {Perspective}},\n\tvolume = {59},\n\tissn = {0888-5885},\n\tshorttitle = {{CO2} {Absorption} {Using} {Membrane} {Contactors}},\n\turl = {https://doi.org/10.1021/acs.iecr.9b05439},\n\tdoi = {10.1021/acs.iecr.9b05439},\n\tabstract = {CO2 absorption is a key to alleviating the environmental consequences of fossil fuel combustion, which is a major source of global CO2 emission. Membrane contactors have showcased several competitive advantages in CO2 absorption over conventional gas–liquid contactors (e.g., packed towers), such as a large mass-transfer area and a safe operation owing to the membranes that physically separate the gas and liquid phases. This Review discusses the state-of-the-art studies related to CO2 absorption using membrane contactors, with focuses on membrane materials, liquid absorbents, process design, and pilot-scale demonstration of membrane contactor processes. Critical challenges in membrane contactor-based CO2 absorption processes, such as membrane fouling and pore wetting, are also discussed.},\n\tnumber = {15},\n\turldate = {2026-01-27},\n\tjournal = {Industrial \\& Engineering Chemistry Research},\n\tpublisher = {American Chemical Society},\n\tauthor = {Chuah, Chong Yang and Kim, Kyunam and Lee, Junghyun and Koh, Dong-Yeun and Bae, Tae-Hyun},\n\tmonth = apr,\n\tyear = {2020},\n\tpages = {6773--6794},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Dynamic metal-polymer interaction for the design of chemoselective and long-lived hydrogenation catalysts.\n \n \n \n \n\n\n \n Lee, S.; Shin, S.; Baek, H.; Choi, Y.; Hyun, K.; Seo, M.; Kim, K.; Koh, D.; Kim, H.; and Choi, M.\n\n\n \n\n\n\n Science Advances, 6(28): eabb7369. July 2020.\n \n\n\n\n
\n\n\n\n \n \n $\"Dynamic$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{lee_dynamic_2020,\n\ttitle = {Dynamic metal-polymer interaction for the design of chemoselective and long-lived hydrogenation catalysts},\n\tvolume = {6},\n\turl = {https://www.science.org/doi/10.1126/sciadv.abb7369},\n\tdoi = {10.1126/sciadv.abb7369},\n\tabstract = {Metal catalysts are generally supported on hard inorganic materials because of their high thermochemical stabilities. Here, we support Pd catalysts on a thermochemically stable but “soft” engineering plastic, polyphenylene sulfide (PPS), for acetylene partial hydrogenation. Near the glass transition temperature ({\\textasciitilde}353 K), the mobile PPS chains cover the entire surface of Pd particles via strong metal-polymer interactions. The Pd-PPS interface enables H2 activation only in the presence of acetylene that has a strong binding affinity to Pd and thus can disturb the Pd-PPS interface. Once acetylene is hydrogenated to weakly binding ethylene, re-adsorption of PPS on the Pd surface repels ethylene before it is further hydrogenated to ethane. The Pd-PPS interaction enables selective partial hydrogenation of acetylene to ethylene even in an ethylene-rich stream and suppresses catalyst deactivation due to coke formation. The results manifest the unique possibility of harnessing dynamic metal-polymer interaction for designing chemoselective and long-lived catalysts.},\n\tnumber = {28},\n\turldate = {2026-01-27},\n\tjournal = {Science Advances},\n\tpublisher = {American Association for the Advancement of Science},\n\tauthor = {Lee, Songhyun and Shin, Seung-Jae and Baek, Hoyong and Choi, Yeonwoo and Hyun, Kyunglim and Seo, Myungeun and Kim, Kyunam and Koh, Dong-Yeun and Kim, Hyungjun and Choi, Minkee},\n\tmonth = jul,\n\tyear = {2020},\n\tpages = {eabb7369},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Microporous Materials in Scalable Shapes: Fiber Sorbents.\n \n \n \n \n\n\n \n Lee, Y. H.; Jeong, J.; Kim, K.; Hyun, T.; Jamal, A.; and Koh, D.\n\n\n \n\n\n\n Chemistry of Materials, 32(17): 7081–7104. September 2020.\n \n\n\n\n
\n\n\n\n \n \n $\"Microporous$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{lee_microporous_2020,\n\ttitle = {Microporous {Materials} in {Scalable} {Shapes}: {Fiber} {Sorbents}},\n\tvolume = {32},\n\tissn = {0897-4756},\n\tshorttitle = {Microporous {Materials} in {Scalable} {Shapes}},\n\turl = {https://doi.org/10.1021/acs.chemmater.0c00183},\n\tdoi = {10.1021/acs.chemmater.0c00183},\n\tabstract = {Microporous materials have the potential to enable new low energy separation processes due to their superb textural properties and structural diversity, yet these materials are facing practical challenges in large-scale applications. Opportunities for advancing microporous sorbents lie in a technology that can bridge the gap between high-performance materials and scalable separation devices. This perspective article discusses the current state of the art and the potential of the fiber sorbent-based separation processes by highlighting the structure–property–performance relationships, candidate porous materials, and application areas.},\n\tnumber = {17},\n\turldate = {2026-01-27},\n\tjournal = {Chemistry of Materials},\n\tpublisher = {American Chemical Society},\n\tauthor = {Lee, Young Hun and Jeong, Jinhong and Kim, Kyunam and Hyun, Taehoon and Jamal, Aqil and Koh, Dong-Yeun},\n\tmonth = sep,\n\tyear = {2020},\n\tpages = {7081--7104},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Solid Carbonation via Ultrapermeable PIM-1 Hollow Fiber Membranes for Scalable CO2 Utilization.\n \n \n \n \n\n\n \n Hwang, Y.; Kim, K.; Seo, H.; and Koh, D.\n\n\n \n\n\n\n ACS Sustainable Chemistry & Engineering, 8(41): 15620–15629. October 2020.\n \n\n\n\n
\n\n\n\n \n \n $\"Solid$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{hwang_solid_2020,\n\ttitle = {Solid {Carbonation} via {Ultrapermeable} {PIM}-1 {Hollow} {Fiber} {Membranes} for {Scalable} {CO2} {Utilization}},\n\tvolume = {8},\n\turl = {https://doi.org/10.1021/acssuschemeng.0c05088},\n\tdoi = {10.1021/acssuschemeng.0c05088},\n\tabstract = {A successful changeover to a future energy system that does not add extra CO2 to the atmosphere, a net-zero emission energy system, is likely to depend on a combination of known technologies enabled by scalable and modular devices. In this article, we discuss prominent technological opportunities and barriers for an integrated approach to carbon capture and utilization (CCU) that can simultaneously exploit both CO2 and industrial wastes. We show that a hollow fiber module based on an ultrapermeable membrane synthesized with the polymers of intrinsic microporosity (PIM-1) has the potential to directly utilize CO2 from the flue gas stack via a continuous solid carbonation reaction. By a quantitative comparative assessment of the continuous PIM-1 module performance for different testing conditions, feasible routes for large-scale CO2 utilization are proposed. We also identified surmountable hurdles in our approaches, such as membrane stability and possible scale formation. An integrated approach of two parallel research streams, CO2 capture and utilization, could provide reliable and cost-effective strategies for large-scale CCU.},\n\tnumber = {41},\n\turldate = {2026-01-27},\n\tjournal = {ACS Sustainable Chemistry \\& Engineering},\n\tpublisher = {American Chemical Society},\n\tauthor = {Hwang, Young-Eun and Kim, Kyunam and Seo, Hyeokjun and Koh, Dong-Yeun},\n\tmonth = oct,\n\tyear = {2020},\n\tpages = {15620--15629},\n}\n\n\n\n\n\n\n\n

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\n \n 2019\n \n \n (3)\n \n \n

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\n \n\n \n \n \n \n \n \n Highly Selective SSZ-13 Zeolite Hollow Fiber Membranes by Ultraviolet Activation at Near-Ambient Temperature.\n \n \n \n \n\n\n \n Yang, S.; Kwon, Y. H.; Koh, D.; Min, B.; Liu, Y.; and Nair, S.\n\n\n \n\n\n\n ChemNanoMat, 5(1): 61–67. 2019.\n _eprint: https://aces.onlinelibrary.wiley.com/doi/pdf/10.1002/cnma.201800272\n\n\n\n
\n\n\n\n \n \n $\"Highly$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{yang_highly_2019,\n\ttitle = {Highly {Selective} {SSZ}-13 {Zeolite} {Hollow} {Fiber} {Membranes} by {Ultraviolet} {Activation} at {Near}-{Ambient} {Temperature}},\n\tvolume = {5},\n\tcopyright = {© 2019 Wiley-VCH Verlag GmbH \\& Co. KGaA, Weinheim},\n\tissn = {2199-692X},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/cnma.201800272},\n\tdoi = {10.1002/cnma.201800272},\n\tabstract = {Zeolitic membranes synthesized using organic structure-directing agents (SDAs) require an activation step to remove the SDA and open their porosity. Activation is typically achieved by high-temperature ({\\textgreater}673 K) calcination. This process has multiple disadvantages, including coke formation due to incomplete removal of the SDA as well as the formation of cracks and other defects due to differential thermal expansion of the membrane layer and the underlying support material. Here we report that high-performance hollow fiber membranes of the small-pore (0.38 nm) zeolite SSZ-13 can be produced via UV irradiation to decompose and remove the SDA. Remarkably, UV irradiation allowed complete removal of the bulky SDA (trimethyladamantylammonium hydroxide) from the pores at near-ambient conditions, whereas membranes activated by calcination exhibited severe cracking. The UV-activated SSZ-13 membranes showed excellent H2/C3H8 and CO2/CH4 mixture selectivities (up to 810 and 110 whereas the conventionally activated membranes showed poor selectivity ({\\textless}5). The combined demonstration of hollow fiber membrane synthesis and low-temperature membrane activation of small-pore zeolite membranes is a significant step in the effort to create reliable, scalable, and low-cost fabrication processes for zeolite membranes for gas separations.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2026-01-27},\n\tjournal = {ChemNanoMat},\n\tauthor = {Yang, Shaowei and Kwon, Yeon Hye and Koh, Dong-Yeun and Min, Byunghyun and Liu, Yujun and Nair, Sankar},\n\tyear = {2019},\n\tnote = {\\_eprint: https://aces.onlinelibrary.wiley.com/doi/pdf/10.1002/cnma.201800272},\n\tkeywords = {CO2/CH4 separation, UV irradiation, hollow fiber, membrane activation, zeolite membrane},\n\tpages = {61--67},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n 2D-enabled membranes: materials and beyond.\n \n \n \n \n\n\n \n Hyun, T.; Jeong, J.; Chae, A.; Kim, Y. K.; and Koh, D.\n\n\n \n\n\n\n BMC Chemical Engineering, 1(1): 12. May 2019.\n \n\n\n\n
\n\n\n\n \n \n $\"2D-enabled$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{hyun_2d-enabled_2019,\n\ttitle = {{2D}-enabled membranes: materials and beyond},\n\tvolume = {1},\n\tissn = {2524-4175},\n\tshorttitle = {{2D}-enabled membranes},\n\turl = {https://doi.org/10.1186/s42480-019-0012-x},\n\tdoi = {10.1186/s42480-019-0012-x},\n\tabstract = {Membranes could reform the field of molecular separations by enabling new low energy manufacturing technologies. This review article discusses the current state of the art and the potential in the 2D-enabled membrane separation processes by highlighting emerging and existing areas in which robust 2D materials significantly impact the energy-efficient separation process. Analysis of 2D-enabled membrane classes and prospective materials for 2D-enabled membranes are also discussed with emphasis on the surface chemistry of basal plane engineered 2D materials.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2026-01-27},\n\tjournal = {BMC Chemical Engineering},\n\tauthor = {Hyun, Taehoon and Jeong, Jinhong and Chae, Ari and Kim, Young Kwan and Koh, Dong-Yeun},\n\tmonth = may,\n\tyear = {2019},\n\tkeywords = {Membrane based separation process, Membrane fabrication, Two-dimensional material},\n\tpages = {12},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Aging: Degradation of Permeability in Microporous Polymeric Membranes.\n \n \n \n \n\n\n \n Kim, K.; and Koh, D.\n\n\n \n\n\n\n Membrane Journal, 29(4): 191–201. 2019.\n \n\n\n\n
\n\n\n\n \n \n $\"Aging:$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{kim_aging_2019,\n\ttitle = {Aging: {Degradation} of {Permeability} in {Microporous} {Polymeric} {Membranes}},\n\tvolume = {29},\n\tissn = {1226-0088},\n\tshorttitle = {Aging},\n\turl = {https://www.kci.go.kr/kciportal/ci/sereArticleSearch/ciSereArtiView.kci?sereArticleSearchBean.artiId=ART002499813},\n\tdoi = {10.14579/MEMBRANE_JOURNAL.2019.29.4.191},\n\tabstract = {Aging: Degradation of Permeability in Microporous Polymeric Membranes - physical aging;polymeric membrane;permeability;selectivity},\n\tlanguage = {kr},\n\tnumber = {4},\n\turldate = {2026-01-27},\n\tjournal = {Membrane Journal},\n\tpublisher = {The Membrane Society Of Korea},\n\tauthor = {Kim, Kyunam and Koh, Dong-Yeun},\n\tyear = {2019},\n\tpages = {191--201},\n}\n\n\n\n\n\n\n\n

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\n \n 2018\n \n \n (3)\n \n \n

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\n \n\n \n \n \n \n \n \n Sub-ambient air separation via Li+ exchanged zeolite.\n \n \n \n \n\n\n \n Koh, D.; Pimentel, B. R.; Babu, V. P.; Stephenson, N.; Chai, S. W.; Rosinski, A.; and Lively, R. P.\n\n\n \n\n\n\n Microporous and Mesoporous Materials, 256: 140–146. January 2018.\n \n\n\n\n
\n\n\n\n \n \n $\"Sub-ambient$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{koh_sub-ambient_2018,\n\ttitle = {Sub-ambient air separation via {Li}+ exchanged zeolite},\n\tvolume = {256},\n\tissn = {1387-1811},\n\turl = {https://www.sciencedirect.com/science/article/pii/S1387181117304316},\n\tdoi = {10.1016/j.micromeso.2017.06.028},\n\tabstract = {In this study, we extend the concept of adsorptive air separation using zeolites to sub-ambient temperature conditions. Sub-ambient temperature conditions investigated in this study (210–270 K) enable larger swing capacities for solid adsorbents under significantly milder conditions than those required by cryogenic distillation systems. Experimental O2 and N2 isotherms—measured in a wide range of temperatures (150 K–300 K)—were utilized to construct multicomponent isotherms (IAST) and estimate the temperature-dependent separation performances of Li+-exchanged type X zeolite (Si/Al ratio ∼1) under synthetic air mixture (22 mol\\% O2 and 78 mol\\% of N2). As temperature decreases from ambient conditions, the IAST selectivity (N2/O2) increases. Sorption breakthrough tests at 240 K with synthetic air mixtures further validated the enhanced swing capacity and selectivity provided by sub-ambient conditions. Dual-bed vacuum pressure swing adsorption (VPSA) experiments at sub-ambient temperatures were compared to standard VPSA experiments at room temperature. The sub-ambient temperature (240 K) application of VPSA process using synthetic air mixture produced O2 with a purity over 99\\% and recovery over 56\\%, surpassing the VPSA performance at ambient temperature conditions (298 K). The separation process investigated in this study could potentially be coupled to certain cryogenic air separation units to reduce the overall energy cost of the unit by supplying O2 enriched stream into the distillation system.},\n\turldate = {2026-01-27},\n\tjournal = {Microporous and Mesoporous Materials},\n\tauthor = {Koh, Dong-Yeun and Pimentel, Brian R. and Babu, Vinod P. and Stephenson, Neil and Chai, Siew W. and Rosinski, Andrew and Lively, Ryan P.},\n\tmonth = jan,\n\tyear = {2018},\n\tkeywords = {Air separation, Cryogenic distillation, Microporous materials, Vacuum pressure swing adsorption, Zeolite},\n\tpages = {140--146},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Ion-Exchanged SAPO-34 Membranes for Krypton–Xenon Separation: Control of Permeation Properties and Fabrication of Hollow Fiber Membranes.\n \n \n \n \n\n\n \n Kwon, Y. H.; Min, B.; Yang, S.; Koh, D.; Bhave, R. R.; and Nair, S.\n\n\n \n\n\n\n ACS Applied Materials & Interfaces, 10(7): 6361–6368. February 2018.\n \n\n\n\n
\n\n\n\n \n \n $\"Ion-Exchanged$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{kwon_ion-exchanged_2018,\n\ttitle = {Ion-{Exchanged} {SAPO}-34 {Membranes} for {Krypton}–{Xenon} {Separation}: {Control} of {Permeation} {Properties} and {Fabrication} of {Hollow} {Fiber} {Membranes}},\n\tvolume = {10},\n\tissn = {1944-8244},\n\tshorttitle = {Ion-{Exchanged} {SAPO}-34 {Membranes} for {Krypton}–{Xenon} {Separation}},\n\turl = {https://doi.org/10.1021/acsami.7b18244},\n\tdoi = {10.1021/acsami.7b18244},\n\tabstract = {Separation of radioisotope 85Kr from 136Xe is of importance in used nuclear fuel reprocessing. Membrane separation based on zeolite molecular sieves such as chabazite SAPO-34 is an attractive alternative to energy-intensive cryogenic distillation. We report the synthesis of SAPO-34 membranes with considerably enhanced performance via thickness reduction based upon control of a steam-assisted vapor–solid conversion technique followed by ion exchange with alkali metal cations. The reduction of membrane thickness leads to a large increase in Kr permeance from 7.5 to 26.3 gas permeation units (GPU) with ideal Kr/Xe selectivities {\\textgreater}20 at 298 K. Cation-exchanged membranes show large ({\\textgreater}50\\%) increases in selectivity at ambient or slight subambient conditions. The adsorption, diffusion, and permeation characteristics of ion-exchanged SAPO-34 materials and membranes are investigated in detail, with potassium-exchanged SAPO-34 membranes showing particularly attractive performance. We then demonstrate the fabrication of selective SAPO-34 membranes on α-alumina hollow fibers.},\n\tnumber = {7},\n\turldate = {2026-01-27},\n\tjournal = {ACS Applied Materials \\& Interfaces},\n\tpublisher = {American Chemical Society},\n\tauthor = {Kwon, Yeon Hye and Min, Byunghyun and Yang, Shaowei and Koh, Dong-Yeun and Bhave, Ramesh R. and Nair, Sankar},\n\tmonth = feb,\n\tyear = {2018},\n\tpages = {6361--6368},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n High-Temperature Activation of Zeolite-Loaded Fiber Sorbents.\n \n \n \n \n\n\n \n Sujan, A. R.; Koh, D.; Zhu, G.; Babu, V. P.; Stephenson, N.; Rosinski, A.; Du, H.; Luo, Y.; Koros, W. J.; and Lively, R. P.\n\n\n \n\n\n\n Industrial & Engineering Chemistry Research, 57(34): 11757–11766. August 2018.\n \n\n\n\n
\n\n\n\n \n \n $\"High-Temperature$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n \n \n 1 download\n \n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{sujan_high-temperature_2018,\n\ttitle = {High-{Temperature} {Activation} of {Zeolite}-{Loaded} {Fiber} {Sorbents}},\n\tvolume = {57},\n\tissn = {0888-5885},\n\turl = {https://doi.org/10.1021/acs.iecr.8b02210},\n\tdoi = {10.1021/acs.iecr.8b02210},\n\tabstract = {Here, we describe the formation of zeolite LiX fiber sorbents and postfabrication activation at temperatures of 350–400 °C for use in air separations. Two polymers were considered as the support matrices for the LiX zeolites: Torlon (polyamide-imide) and Matrimid (polyimide). Torlon-based fiber sorbents exhibit approximately 4\\% mass loss during the high-temperature (370 °C) activation required for zeolites, which is close to the glass transition temperature of these polymers. This mass loss is accompanied by the formation of pyrolytic side products that ultimately resulted in contamination of the LiX crystals and a 73\\% reduction in N2 sorption capacity at ambient temperatures. In contrast, Matrimid was found to be suitable for fiber sorbent synthesis with only 10–15\\% reduction in N2 sorption capacity observed upon the thermal activation. A LiX loading of 73\\% in monolithic fibers (i.e., no bore) by weight was achievable. Experimental breakthrough tests at 25 °C were conducted on an activated fiber module consisting of densely packed LiX–Matrimid fiber sorbents and operated over a range of adsorption pressures (1–3.5 bar) that are often used in an actual pressure swing adsorption (PSA) process for air separation.},\n\tnumber = {34},\n\turldate = {2026-01-27},\n\tjournal = {Industrial \\& Engineering Chemistry Research},\n\tpublisher = {American Chemical Society},\n\tauthor = {Sujan, Achintya R. and Koh, Dong-Yeun and Zhu, Guanghui and Babu, Vinod P. and Stephenson, Neil and Rosinski, Andrew and Du, Hai and Luo, Yang and Koros, William J. and Lively, Ryan P.},\n\tmonth = aug,\n\tyear = {2018},\n\tpages = {11757--11766},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n 2017\n \n \n (3)\n \n \n

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\n \n\n \n \n \n \n \n \n Secondary gaseous guest-dependent structures of binary neopentyl alcohol hydrates and their tuning behavior for potential application to CO2 capture.\n \n \n \n \n\n\n \n Moon, S.; Ahn, Y.; Kim, H.; Hong, S.; Koh, D.; and Park, Y.\n\n\n \n\n\n\n Chemical Engineering Journal, 330: 890–898. December 2017.\n \n\n\n\n
\n\n\n\n \n \n $\"Secondary$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{moon_secondary_2017,\n\ttitle = {Secondary gaseous guest-dependent structures of binary neopentyl alcohol hydrates and their tuning behavior for potential application to {CO2} capture},\n\tvolume = {330},\n\tissn = {1385-8947},\n\turl = {https://www.sciencedirect.com/science/article/pii/S1385894717313700},\n\tdoi = {10.1016/j.cej.2017.08.030},\n\tabstract = {Clathrate hydrates, commonly called gas hydrates, are non-stoichiometric inclusion compounds with tunable gas storage and separation capabilities. Various efforts have been made to apply these hydrates to energy and environmental fields including energy storage and greenhouse gas capture and separation technologies. Although the unary use of gaseous guest molecules such as methane, carbon dioxide, and nitrogen is generally expected to achieve maximal storage capacity by filling the guest in both small and large cages of each structure, introducing additional liquid guest molecules into the clathrate hydrates could be a more feasible option from an engineering perspective, since such liquid guest molecules often play a critical role in stabilization of the clathrate hydrate by shifting the thermodynamic phase equilibria to practically implementable milder pressure and temperature conditions. Here, we focus on the binary neopentyl alcohol clathrate hydrates with gaseous guest molecules, including carbon dioxide, methane, and nitrogen, to provide a better understanding of the complex nature of the host–guest interactions occurring in the clathrate hydrates. Thermodynamic P – T phase equilibria were measured, and spectroscopic analyses were performed employing HRPD, Raman, and NMR spectrometers. The results revealed that the NPA guest molecule forms sI or sII hydrate depending on the binary gaseous guest molecules. This paper also reports for the first time that the composition of CO2 guest molecules may be ‘tuned’ within the cages of sI hydrate of NPA.},\n\turldate = {2026-01-27},\n\tjournal = {Chemical Engineering Journal},\n\tauthor = {Moon, Seokyoon and Ahn, Yun-Ho and Kim, Heejoong and Hong, Sujin and Koh, Dong-Yeun and Park, Youngjune},\n\tmonth = dec,\n\tyear = {2017},\n\tkeywords = {Carbon dioxide, Clathrate, Gas hydrate, Methane, Neopentyl alcohol, Tuning effect},\n\tpages = {890--898},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Enabling Widespread Use of Microporous Materials for Challenging Organic Solvent Separations.\n \n \n \n \n\n\n \n Jue, M. L.; Koh, D.; McCool, B. A.; and Lively, R. P.\n\n\n \n\n\n\n Chemistry of Materials, 29(23): 9863–9876. December 2017.\n \n\n\n\n
\n\n\n\n \n \n $\"Enabling$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{jue_enabling_2017,\n\ttitle = {Enabling {Widespread} {Use} of {Microporous} {Materials} for {Challenging} {Organic} {Solvent} {Separations}},\n\tvolume = {29},\n\tissn = {0897-4756},\n\turl = {https://doi.org/10.1021/acs.chemmater.7b03456},\n\tdoi = {10.1021/acs.chemmater.7b03456},\n\tabstract = {Organic solvent separations could revolutionize the field of separations by enabling new low energy, low carbon emission technologies. Microporous materials are potential game changers for these challenging separations due to their ability to provide superb size and shape discrimination; however, large-scale application of these materials has yet to be adopted. This critical perspective will discuss the current state of the art in the separation of similarly sized organic molecules via microporous membranes and provide key focus areas for future research.},\n\tnumber = {23},\n\turldate = {2026-01-27},\n\tjournal = {Chemistry of Materials},\n\tpublisher = {American Chemical Society},\n\tauthor = {Jue, Melinda L. and Koh, Dong-Yeun and McCool, Benjamin A. and Lively, Ryan P.},\n\tmonth = dec,\n\tyear = {2017},\n\tpages = {9863--9876},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Zeolitic Imidazolate Framework Membranes Supported on Macroporous Carbon Hollow Fibers by Fluidic Processing Techniques.\n \n \n \n \n\n\n \n Eum, K.; Ma, C.; Koh, D.; Rashidi, F.; Li, Z.; Jones, C. W.; Lively, R. P.; and Nair, S.\n\n\n \n\n\n\n Advanced Materials Interfaces, 4(12): 1700080. 2017.\n _eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/admi.201700080\n\n\n\n
\n\n\n\n \n \n $\"Zeolitic$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{eum_zeolitic_2017,\n\ttitle = {Zeolitic {Imidazolate} {Framework} {Membranes} {Supported} on {Macroporous} {Carbon} {Hollow} {Fibers} by {Fluidic} {Processing} {Techniques}},\n\tvolume = {4},\n\tcopyright = {© 2017 WILEY-VCH Verlag GmbH \\& Co. KGaA, Weinheim},\n\tissn = {2196-7350},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/admi.201700080},\n\tdoi = {10.1002/admi.201700080},\n\tabstract = {This study addresses the challenge of generalizable fabrication of metal-organic framework (particularly zeolitic imidazolate frameworks (ZIF)) hollow fiber membranes that can allow a broader range of separations including hydrocarbon (“petrochemical”) as well as organics/water (“biorefining”) separations. We report a novel strategy that combines fluidic membrane processing with chemically inert carbon hollow fibers to produce robust ZIF membranes. Macroporous carbon hollow fibers are successfully fabricated by pyrolytic conversion of cross-linked polymer hollow fibers. This step allows the use of a wide range of relatively aggressive fluidic processing solvents and conditions. Using these inert fiber supports, the fabrication of ZIF-90 membranes is demonstrated and their butane isomer separations are investigated for the first time. Furthermore, ZIF membranes on carbon hollow fibers can be used in the separation of water/organic mixtures without the issue of fiber swelling or dissolution as seen in ZIF/polymer hollow fiber membranes. ZIF-8/carbon membranes show stable operation spanning several days for dehydration of furfural and ethanol, with high water permeances and separation factors. In all cases, the ZIF membranes are prepared without any seeding, support modification, or postsynthesis procedures, thereby simplifying the fabrication process and increasing the potential for larger-scale membrane fabrication.},\n\tlanguage = {en},\n\tnumber = {12},\n\turldate = {2026-01-27},\n\tjournal = {Advanced Materials Interfaces},\n\tauthor = {Eum, Kiwon and Ma, Chen and Koh, Dong-Yeun and Rashidi, Fereshteh and Li, Zhong and Jones, Christopher W. and Lively, Ryan P. and Nair, Sankar},\n\tyear = {2017},\n\tnote = {\\_eprint: https://advanced.onlinelibrary.wiley.com/doi/pdf/10.1002/admi.201700080},\n\tkeywords = {carbon, gas separation, hollow fibers, liquid separation, metal-organic frameworks},\n\tpages = {1700080},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n 2016\n \n \n (7)\n \n \n

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\n \n\n \n \n \n \n \n \n Energy-efficient natural gas hydrate production using gas exchange.\n \n \n \n \n\n\n \n Koh, D.; Kang, H.; Lee, J.; Park, Y.; Kim, S.; Lee, J.; Lee, J. Y.; and Lee, H.\n\n\n \n\n\n\n Applied Energy, 162: 114–130. January 2016.\n \n\n\n\n
\n\n\n\n \n \n $\"Energy-efficient$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{koh_energy-efficient_2016,\n\ttitle = {Energy-efficient natural gas hydrate production using gas exchange},\n\tvolume = {162},\n\tissn = {0306-2619},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0306261915013094},\n\tdoi = {10.1016/j.apenergy.2015.10.082},\n\tabstract = {Breaking the bounds of classical natural gas hydrate (NGH) production processes, a newborn concept based on the gas exchange mechanism provides an opportunity to catch two birds with one stone: simultaneously achieving the sequestration of CO2 for climate change mitigation and the enhanced recovery of CH4 for energy production. As a ‘new paradigm’ in NGH production schemes, the non-destructive gas exchange as one of the most stable and promising NGH recovery approaches has received much attention in the fields of physics, chemistry, chemical engineering, civil engineering, petroleum engineering and geology. In this review, we assess the state-of-the-art gas exchange concept for NGH production by understanding its principles and developments, with emphasis on another technical breakthrough using the CO2+N2 gas mixture injection. After establishing the fundamentals of the gas exchange process, we make a general survey of the NGH field production in the North Slope of Alaska in 2012, which practically adopted the gas exchange as a key technology. Several recent international NGH field production tests that basically use depressurization are also briefly analyzed for comparison. We suggest that the gas exchange method is ready to be tested in the NGH deposits with the valuable lessons learned from past pioneering tests.},\n\turldate = {2026-01-27},\n\tjournal = {Applied Energy},\n\tauthor = {Koh, Dong-Yeun and Kang, Hyery and Lee, Jong-Won and Park, Youngjune and Kim, Se-Joon and Lee, Jaehyoung and Lee, Joo Yong and Lee, Huen},\n\tmonth = jan,\n\tyear = {2016},\n\tkeywords = {CO–CH replacement, Gas exchange, Natural gas hydrate, Thermodynamics},\n\tpages = {114--130},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Gas hydrate inhibition by 3-hydroxytetrahydrofuran: Spectroscopic identifications and hydrate phase equilibria.\n \n \n \n \n\n\n \n Ahn, Y.; Kang, H.; Koh, D.; Park, Y.; and Lee, H.\n\n\n \n\n\n\n Fluid Phase Equilibria, 413: 65–70. April 2016.\n \n\n\n\n
\n\n\n\n \n \n $\"Gas$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{ahn_gas_2016,\n\tseries = {Special {Issue}: {Gas} {Hydrates} and {Semiclathrate} {Hydrates}},\n\ttitle = {Gas hydrate inhibition by 3-hydroxytetrahydrofuran: {Spectroscopic} identifications and hydrate phase equilibria},\n\tvolume = {413},\n\tissn = {0378-3812},\n\tshorttitle = {Gas hydrate inhibition by 3-hydroxytetrahydrofuran},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0378381215302478},\n\tdoi = {10.1016/j.fluid.2015.12.005},\n\tabstract = {Large organic guest molecules (LOGMs) have been reported to form clathrate hydrates with help gas molecules. Specific LOGMs with a hydroxyl group show an ‘inhibition effect’ on the thermodynamic equilibria of clathrate hydrates, forcing the phase equilibrium curve to shift to a relatively unstable region of lower temperature and higher pressure conditions. Here, we introduce a potential candidate, 3-hydroxytetrahydrofuran (3-OH THF), which has a sole different functional group from tetrahydrofuran (THF), a powerful thermodynamic promoter, to examine the effect of the hydroxyl group on the phase equilibria of clathrate hydrates. The powder X-ray diffraction patterns and Raman spectra reveal that both sI and sII clathrate hydrates can be formed depending on the type of help gas molecules (methane, nitrogen, oxygen, and carbon dioxide). Additionally, the phase equilibria of binary (3-OH THF + help gases) clathrate hydrates are measured to check the degree of inhibition due to the substituted hydroxyl group. The carbon dioxide, unlike other gaseous guest molecules, prevented LOGMs of 3-OH THF from occupying sII large cages, and thus we only observed the appearance of pure carbon dioxide hydrate.},\n\turldate = {2026-01-27},\n\tjournal = {Fluid Phase Equilibria},\n\tauthor = {Ahn, Yun-Ho and Kang, Hyery and Koh, Dong-Yeun and Park, Youngjune and Lee, Huen},\n\tmonth = apr,\n\tyear = {2016},\n\tkeywords = {3-Hydroxytetrahydrofuran (3-OH THF), Clathrate hydrate, Hydroxyl group, Inhibition effect, New sII hydrate former},\n\tpages = {65--70},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Thermodynamic and spectroscopic identification of aldehyde hydrates.\n \n \n \n \n\n\n \n Kang, H.; Ahn, Y.; Koh, D.; and Lee, H.\n\n\n \n\n\n\n Korean Journal of Chemical Engineering, 33(6): 1897–1902. June 2016.\n \n\n\n\n
\n\n\n\n \n \n $\"Thermodynamic$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{kang_thermodynamic_2016,\n\ttitle = {Thermodynamic and spectroscopic identification of aldehyde hydrates},\n\tvolume = {33},\n\tissn = {1975-7220},\n\turl = {https://doi.org/10.1007/s11814-016-0028-3},\n\tdoi = {10.1007/s11814-016-0028-3},\n\tabstract = {-It has been reported that some aldehyde compounds have formed simple sII clathrate hydrates without help-gas molecules, showing a self-forming effect. However, the structure of aldehyde hydrates is quite unstable due to the “gem-diol reaction”. According to the previous studies, the aldehyde hydrate slowly decomposes at atmospheric condition with the conversion of aldehyde to gem-diol. We investigated binary aldehyde (acetaldehyde, propionaldehyde, and isobutyraldehyde)+methane clathrate hydrate with spectroscopic and thermodynamic analyses. Similar to the simple aldehyde hydrate, the binary hydrates also formed a sII hydrate. During the hydrate formation process, we found that most of the aldehydes converted to gem-diols and were then incorporated into the large cages of the sII hydrate. Depending on the equilibrium constant of the gem-diol reaction caused by the molecular structures of the three aldehydes, different phase equilibrium curves of aldehyde+methane hydrates were obtained.},\n\tlanguage = {en},\n\tnumber = {6},\n\turldate = {2026-01-27},\n\tjournal = {Korean Journal of Chemical Engineering},\n\tauthor = {Kang, Hyery and Ahn, Yun-Ho and Koh, Dong-Yeun and Lee, Huen},\n\tmonth = jun,\n\tyear = {2016},\n\tkeywords = {Aldehyde, Binary Hydrates, Clathrate Hydrate, Gem-diol, Phase Equilibrium},\n\tpages = {1897--1902},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Experimental verifications of Mpemba-like behaviors of clathrate hydrates.\n \n \n \n \n\n\n \n Ahn, Y.; Kang, H.; Koh, D.; and Lee, H.\n\n\n \n\n\n\n Korean Journal of Chemical Engineering, 33(6): 1903–1907. March 2016.\n \n\n\n\n
\n\n\n\n \n \n $\"Experimental$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{ahn_experimental_2016,\n\ttitle = {Experimental verifications of {Mpemba}-like behaviors of clathrate hydrates},\n\tvolume = {33},\n\tcopyright = {2016 Korean Institute of Chemical Engineers, Seoul, Korea},\n\tissn = {1975-7220},\n\turl = {https://link.springer.com/article/10.1007/s11814-016-0029-2},\n\tdoi = {10.1007/s11814-016-0029-2},\n\tabstract = {The exact mechanism of the Mpemba effect of water was recently investigated microscopically and explained on the basis of the cooperative relationship between intramolecular polar-covalent bonds (O-H) and intermolecular hydrogen bonds (O:H). We posited that this relationship might exist in clathrate hydrates since they consist of hydrogen-bonded host water frameworks and enclathrated guest molecules. The formation of tetrahydrofuran (THF) hydrate, which is the simplest clathrate hydrate, was investigated by using differential scanning calorimetry and Raman spectroscopy. THF hydrates show the Mpemba effect at lower initial temperatures, but formation times were delayed at higher initial temperatures because the evaporated THF molecules should be liquefied to correspond to the stoichiometric concentration of guest molecules to form sII clathrate hydrates. However, even though the formation time was delayed at higher initial temperatures, the rates of heat emission during THF hydrate formation, measured in a bulk state, roughly increased as the initial temperature increased. Moreover, we observed that the O: H stretching phonons of water in the THF hydrate showed a blue shift, and the O-H stretching mode showed a redshift as temperature decreased. Both the rate of heat emission and the Raman shift of these two bonds imply that a cooperative relationship between the covalent bond and the hydrogen bond exists in THF hydrate as pure water. The formation kinetics of THF hydrate therefore might depend on its initial temperature, thus showing Mpemba-like behavior.},\n\tlanguage = {En},\n\tnumber = {6},\n\turldate = {2026-01-27},\n\tjournal = {Korean Journal of Chemical Engineering},\n\tpublisher = {Springer},\n\tauthor = {Ahn, Yun-Ho and Kang, Hyery and Koh, Dong-Yeun and Lee, Huen},\n\tmonth = mar,\n\tyear = {2016},\n\tpages = {1903--1907},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Tuning magnetism via selective injection into ice-like clathrate hydrates.\n \n \n \n \n\n\n \n Park, Y.; Koh, D.; Dho, J.; Yeon, S.; and Lee, H.\n\n\n \n\n\n\n Korean Journal of Chemical Engineering, 33(5): 1706–1711. May 2016.\n \n\n\n\n
\n\n\n\n \n \n $\"Tuning$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{park_tuning_2016,\n\ttitle = {Tuning magnetism via selective injection into ice-like clathrate hydrates},\n\tvolume = {33},\n\tissn = {1975-7220},\n\turl = {https://doi.org/10.1007/s11814-015-0291-8},\n\tdoi = {10.1007/s11814-015-0291-8},\n\tabstract = {Clathrate hydrates exhibit unique intermolecular interactions between host-guest and guest-guest molecules because they have 3-dimensional superstructures consisting of the sublattices created by hydrogen-bonded water molecules that form cage-like frameworks in which guest molecules can be incorporated. Lattice engineering or molecular engineering using a selective injection of specific guest molecules into these sublattices can be exploited to tune the physicochemical properties of guest molecules or to create new functional materials. Here, we report distinctive intermolecular behavior of oxygen molecules that are selectively inserted in a structure-II type superstructure consisting of a tetrahedral sublattice by the small 512 water cages and a diamond-like sublattice by the large 51264 cages. Pure O2 clathrate hydrate and binary THF+O2 clathrate hydrate were synthesized, and their magnetism and heat capacity were measured at low temperature conditions. These results strongly suggest that the magnetic property of the oxygen molecule is largely varied with the formation of a 3-dimensional superstructure by the injection of O2 into the water frameworks.},\n\tlanguage = {en},\n\tnumber = {5},\n\turldate = {2026-01-27},\n\tjournal = {Korean Journal of Chemical Engineering},\n\tauthor = {Park, Youngjune and Koh, Dong-Yeun and Dho, Joonghoe and Yeon, Sun-Hwa and Lee, Huen},\n\tmonth = may,\n\tyear = {2016},\n\tkeywords = {Clathrate, Gas Hydrate, Magnetism, Oxygen, Tetrahydrofuran},\n\tpages = {1706--1711},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Rapid Clathrate Hydrate Formation Using a Heavy Guest Molecule with Sodium Dodecyl Sulfate.\n \n \n \n \n\n\n \n Kang, H.; Ahn, Y.; Koh, D.; Baek, S.; Lee, J. W.; and Lee, H.\n\n\n \n\n\n\n Industrial & Engineering Chemistry Research, 55(21): 6079–6084. June 2016.\n \n\n\n\n
\n\n\n\n \n \n $\"Rapid$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{kang_rapid_2016,\n\ttitle = {Rapid {Clathrate} {Hydrate} {Formation} {Using} a {Heavy} {Guest} {Molecule} with {Sodium} {Dodecyl} {Sulfate}},\n\tvolume = {55},\n\tissn = {0888-5885},\n\turl = {https://doi.org/10.1021/acs.iecr.6b01286},\n\tdoi = {10.1021/acs.iecr.6b01286},\n\tabstract = {Clathrate hydrates provide porous structures for encaging gas molecules at a high volume ratio (v/v) and can be exploited to improve industrial gas storage and transportation. Direct clathrate hydrate formation from liquid water without mechanical agitation has yielded very low conversion rates due to the mass-transfer limitation between phases. In the present study, the heavy guest molecule of iodomethane was introduced to achieve both rapid clathrate hydrate formation and a high conversion rate. Iodomethane showed full enclathration in water cages in a few minutes and even accelerated the full conversion to a mixed hydrate (sII hydrates) with methane to 1.5 min by renewing liquid–liquid interfaces without mechanical agitation. The interfacial renewal at the growth front will contribute to developing a cost-effective method for natural gas storage and transportation in a clathrate hydrate form.},\n\tnumber = {21},\n\turldate = {2026-01-27},\n\tjournal = {Industrial \\& Engineering Chemistry Research},\n\tpublisher = {American Chemical Society},\n\tauthor = {Kang, Hyery and Ahn, Yun-Ho and Koh, Dong-Yeun and Baek, Seungjun and Lee, Jae W. and Lee, Huen},\n\tmonth = jun,\n\tyear = {2016},\n\tpages = {6079--6084},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Reverse osmosis molecular differentiation of organic liquids using carbon molecular sieve membranes.\n \n \n \n \n\n\n \n Koh, D.; McCool, B. A.; Deckman, H. W.; and Lively, R. P.\n\n\n \n\n\n\n Science, 353(6301): 804–807. August 2016.\n \n\n\n\n
\n\n\n\n \n \n $\"Reverse$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{koh_reverse_2016,\n\ttitle = {Reverse osmosis molecular differentiation of organic liquids using carbon molecular sieve membranes},\n\tvolume = {353},\n\turl = {https://www.science.org/doi/10.1126/science.aaf1343},\n\tdoi = {10.1126/science.aaf1343},\n\tabstract = {Liquid-phase separations of similarly sized organic molecules using membranes is a major challenge for energy-intensive industrial separation processes. We created free-standing carbon molecular sieve membranes that translate the advantages of reverse osmosis for aqueous separations to the separation of organic liquids. Polymer precursors were cross-linked with a one-pot technique that protected the porous morphology of the membranes from thermally induced structural rearrangement during carbonization. Permeation studies using benzene derivatives whose kinetic diameters differ by less than an angstrom show kinetically selective organic liquid reverse osmosis. Ratios of single-component fluxes for para- and ortho-xylene exceeding 25 were observed and para- and ortho- liquid mixtures were efficiently separated, with an equimolar feed enriched to 81 mole \\% para-xylene, without phase change and at ambient temperature.},\n\tnumber = {6301},\n\turldate = {2026-01-27},\n\tjournal = {Science},\n\tpublisher = {American Association for the Advancement of Science},\n\tauthor = {Koh, Dong-Yeun and McCool, Benjamin A. and Deckman, Harry W. and Lively, Ryan P.},\n\tmonth = aug,\n\tyear = {2016},\n\tpages = {804--807},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n 2015\n \n \n (6)\n \n \n

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\n \n\n \n \n \n \n \n \n One-dimensional productivity assessment for on-field methane hydrate production using CO2/N2 mixture gas.\n \n \n \n \n\n\n \n Koh, D.; Ahn, Y.; Kang, H.; Park, S.; Lee, J. Y.; Kim, S.; Lee, J.; and Lee, H.\n\n\n \n\n\n\n AIChE Journal, 61(3): 1004–1014. 2015.\n _eprint: https://aiche.onlinelibrary.wiley.com/doi/pdf/10.1002/aic.14687\n\n\n\n
\n\n\n\n \n \n $\"One-dimensional$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{koh_one-dimensional_2015,\n\ttitle = {One-dimensional productivity assessment for on-field methane hydrate production using {CO2}/{N2} mixture gas},\n\tvolume = {61},\n\tcopyright = {© 2014 American Institute of Chemical Engineers},\n\tissn = {1547-5905},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/aic.14687},\n\tdoi = {10.1002/aic.14687},\n\tabstract = {The direct recovery of methane from gas hydrate-bearing sediments is demonstrated, where a gaseous mixture of CO2 + N2 is used to trigger a replacement reaction in complex phase surroundings. A one-dimensional high-pressure reactor (8 m) was designed to test the actual aspects of the replacement reaction occurring in natural gas hydrate (NGH) reservoir conditions. NGH can be converted into CO2 hydrate by a “replacement mechanism,” which serves double duty as a means of both sustainable energy source extraction and greenhouse gas sequestration. The replacement efficiency controlling totally recovered CH4 amount is inversely proportional to CO2 + N2 injection rate which directly affecting solid - gas contact time. Qualitative/quantitative analysis on compositional profiles at each port reveals that the length more than 5.6 m is required to show noticeable recovery rate for NGH production. These outcomes are expected to establish the optimized key process variables for near future field production tests. © 2014 American Institute of Chemical Engineers AIChE J, 61: 1004–1014, 2015},\n\tlanguage = {en},\n\tnumber = {3},\n\turldate = {2026-01-29},\n\tjournal = {AIChE Journal},\n\tauthor = {Koh, Dong-Yeun and Ahn, Yun-Ho and Kang, Hyery and Park, Seongmin and Lee, Joo Yong and Kim, Se-Joon and Lee, Jaehyoung and Lee, Huen},\n\tyear = {2015},\n\tnote = {\\_eprint: https://aiche.onlinelibrary.wiley.com/doi/pdf/10.1002/aic.14687},\n\tkeywords = {carbon dioxide, energy, gas hydrate, methane, replacement},\n\tpages = {1004--1014},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Reactive radical cation transfer in the cages of icy clathrate hydrates.\n \n \n \n \n\n\n \n Koh, D.; Kang, H.; and Lee, H.\n\n\n \n\n\n\n Korean Journal of Chemical Engineering, 32(2): 350–353. January 2015.\n \n\n\n\n
\n\n\n\n \n \n $\"Reactive$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{koh_reactive_2015,\n\ttitle = {Reactive radical cation transfer in the cages of icy clathrate hydrates},\n\tvolume = {32},\n\tcopyright = {2015 Korean Institute of Chemical Engineers, Seoul, Korea},\n\tissn = {1975-7220},\n\turl = {https://link.springer.com/article/10.1007/s11814-014-0280-3},\n\tdoi = {10.1007/s11814-014-0280-3},\n\tabstract = {Clathrate hydrates are crystalline compounds consisting of hydrogen-bonded host water frameworks that eventually structure polyhedral cages. We suggest for the first time their potential as nano-reactors in which target reactions can occur. The energetics of one-dimensional CO radical cation (CO·+) transfers through the hexagonal faces of sI large cages are closely examined to verify the reaction concept in an icy confined space. The barrier energies for migrating a CO radical cation from the cage center to the edge of the hexagonal face are estimated to be 87 and 311 kJ/mol according to calculations with the B3LYP 6−311+G (d, p) basis set, significantly depending on the orientation of the radical. These results indicate that the barrier energy increases sharply when the CO radical cations are oriented parallel to the cage’s hexagonal face. In the parallel migration mode, the hydrogen-bonded water networks are repulsed by electron clouds of CO·+ located on the same plane; thus, the repulsion forces induce a significant increase in the barrier energies. Further, we used separate basis sets of high and low levels processed by the ONIOM scheme for the effective calculation of the entire cage structure of the clathrate hydrates with guest molecules. The calculation run time was significantly shortened when the ONIOM scheme was adopted, while a difference in the barrier energy of approximately 5\\% was observed compared to the full-scale calculation with a high-level basis set.},\n\tlanguage = {En},\n\tnumber = {2},\n\turldate = {2026-01-29},\n\tjournal = {Korean Journal of Chemical Engineering},\n\tpublisher = {Springer},\n\tauthor = {Koh, Dong-Yeun and Kang, Hyery and Lee, Huen},\n\tmonth = jan,\n\tyear = {2015},\n\tpages = {350--353},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Optical Properties of Tetrahydrofuran Clathrate Hydrates with Polyvinylpyrrolidone (THF + H2O + PVP) Revealed by Terahertz (THz) Time-Domain Spectroscopy.\n \n \n \n \n\n\n \n Kang, H.; Koh, D.; Ahn, Y.; Jung, S.; Park, J.; Lee, J.; and Lee, H.\n\n\n \n\n\n\n Journal of Chemical & Engineering Data, 60(2): 238–246. February 2015.\n \n\n\n\n
\n\n\n\n \n \n $\"Optical$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{kang_optical_2015,\n\ttitle = {Optical {Properties} of {Tetrahydrofuran} {Clathrate} {Hydrates} with {Polyvinylpyrrolidone} ({THF} + {H2O} + {PVP}) {Revealed} by {Terahertz} ({THz}) {Time}-{Domain} {Spectroscopy}},\n\tvolume = {60},\n\tissn = {0021-9568},\n\turl = {https://doi.org/10.1021/je5005092},\n\tdoi = {10.1021/je5005092},\n\tabstract = {Terahertz time-domain spectroscopy (THz-TDS) was used to observe the tetrahydrofuran (THF) clathrate hydrate system with dosage of polyvinylpyrrolidone (PVP) with three different average molecular weights (10 000 g/mol, 40 000 g/mol, and 360 000 g/mol). Distinct footprints of phase transition in the THz region (0.4 THz to 2.2 THz) were analyzed and absorption coefficients and complex refractive indices are obtained and compared in the temperature range of 253 to 288 K. Along with the optical properties, ring breathing and stretching modes for different molecular weights of PVP in THF hydrate are analyzed by Raman spectroscopy.},\n\tnumber = {2},\n\turldate = {2026-01-29},\n\tjournal = {Journal of Chemical \\& Engineering Data},\n\tpublisher = {American Chemical Society},\n\tauthor = {Kang, Hyery and Koh, Dong-Yeun and Ahn, Yun-Ho and Jung, Seonghoon and Park, Jaehun and Lee, Jaehyoung and Lee, Huen},\n\tmonth = feb,\n\tyear = {2015},\n\tpages = {238--246},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Optical Interpretation of the Chemical Process of CH4–CO2 Exchange and Its Application to Gas Hydrate Production.\n \n \n \n \n\n\n \n Kang, H.; Ahn, Y.; Koh, D.; Kim, S.; Park, J.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry C, 119(37): 21353–21357. September 2015.\n \n\n\n\n
\n\n\n\n \n \n $\"Optical$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{kang_optical_2015,\n\ttitle = {Optical {Interpretation} of the {Chemical} {Process} of {CH4}–{CO2} {Exchange} and {Its} {Application} to {Gas} {Hydrate} {Production}},\n\tvolume = {119},\n\tissn = {1932-7447},\n\turl = {https://doi.org/10.1021/acs.jpcc.5b05827},\n\tdoi = {10.1021/acs.jpcc.5b05827},\n\tabstract = {The guest-exchange method (or replacement) for methane production from gas hydrates has recently received attention because it can be used for both carbon dioxide sequestration and methane production. The structure of gas hydrates is maintained as a structure I (sI) hydrate while methane molecules are exchanged with carbon dioxide. In this study, CH4 + CO2 mixed gas hydrates were examined under terahertz light at various temperatures to simulate CH4–CO2 exchange reactions. Each gas hydrate composition examined was a representative composition at each step of the exchange reaction. The molecular composition was also accurately analyzed by gas chromatography. Refractive indices calculated by the terahertz time-domain spectroscopy (THz-TDS) of gas hydrate samples were correlated to the guest composition, and this novel method was proven to be used to quantify the extent of replacement via optical constant. Furthermore, changes in the water framework from the sI hydrate to ice using THz-TDS were investigated with an increasing temperature. Overall, this study reveals the process of guest exchange and phase transition from a gas hydrate to ice via the optical properties in the terahertz region, and it offers a powerful tool in gas hydrate production.},\n\tnumber = {37},\n\turldate = {2026-01-29},\n\tjournal = {The Journal of Physical Chemistry C},\n\tpublisher = {American Chemical Society},\n\tauthor = {Kang, Hyery and Ahn, Yun-Ho and Koh, Dong-Yeun and Kim, Seongheun and Park, Jaehun and Lee, Huen},\n\tmonth = sep,\n\tyear = {2015},\n\tpages = {21353--21357},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Membranes at the limit.\n \n \n \n \n\n\n \n Koh, D.; and Lively, R. P.\n\n\n \n\n\n\n Nature Nanotechnology, 10(5): 385–386. May 2015.\n \n\n\n\n
\n\n\n\n \n \n $\"Membranes$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n\n\n\n

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@article{koh_membranes_2015,\n\ttitle = {Membranes at the limit},\n\tvolume = {10},\n\tcopyright = {2015 Springer Nature Limited},\n\tissn = {1748-3395},\n\turl = {https://www.nature.com/articles/nnano.2015.77},\n\tdoi = {10.1038/nnano.2015.77},\n\tabstract = {Water desalination membranes can be created by etching nanometre-sized pores in a single layer of graphene.},\n\tlanguage = {en},\n\tnumber = {5},\n\turldate = {2026-01-29},\n\tjournal = {Nature Nanotechnology},\n\tpublisher = {Nature Publishing Group},\n\tauthor = {Koh, Dong-Yeun and Lively, Ryan P.},\n\tmonth = may,\n\tyear = {2015},\n\tkeywords = {Graphene, Nanofluidics},\n\tpages = {385--386},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Soaking Process for the Enhanced Methane Recovery of Gas Hydrates via CO2/N2 Gas Injection.\n \n \n \n \n\n\n \n Seo, Y.; Kim, D.; Koh, D.; Lee, J. Y.; Ahn, T.; Kim, S.; Lee, J.; and Lee, H.\n\n\n \n\n\n\n Energy & Fuels, 29(12): 8143–8150. December 2015.\n \n\n\n\n
\n\n\n\n \n \n $\"Soaking$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{seo_soaking_2015,\n\ttitle = {Soaking {Process} for the {Enhanced} {Methane} {Recovery} of {Gas} {Hydrates} via {CO2}/{N2} {Gas} {Injection}},\n\tvolume = {29},\n\tissn = {0887-0624},\n\turl = {https://doi.org/10.1021/acs.energyfuels.5b02128},\n\tdoi = {10.1021/acs.energyfuels.5b02128},\n\tabstract = {Replacement technique is known as a promising method for potential energy extraction from gas hydrate deposits and greenhouse gas sequestration into deep ocean sediments. When it comes to the utilization of the replacement method in field applications, the soaking duration or the frequency of CO2/N2 gas injection becomes an important process variable. In this study, the influence of soaking duration and frequency on the CH4 replacement efficiency was quantitatively investigated for the first time by imitating the gas hydrate-bearing sediments. The CH4 replacement process with CO2/N2 was performed through two consecutive stages: dynamic replacement and soaking process. While any additional soaking process after the dynamic process enhanced the CH4 replacement efficiency from 35–36 to 52–60\\%, several replenishments of a fresh CO2/N2 gas mixture into the vapor phase were considered more effective than solely increasing the soaking time. The present study will help in establishing the basic process variables for obtaining an enhanced CH4 replacement efficiency during the well design and operation of the replacement technique in field production tests.},\n\tnumber = {12},\n\turldate = {2026-01-27},\n\tjournal = {Energy \\& Fuels},\n\tpublisher = {American Chemical Society},\n\tauthor = {Seo, Young-ju and Kim, Daeok and Koh, Dong-Yeun and Lee, Joo Yong and Ahn, Taewoong and Kim, Se-Joon and Lee, Jaehyoung and Lee, Huen},\n\tmonth = dec,\n\tyear = {2015},\n\tpages = {8143--8150},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n 2014\n \n \n (4)\n \n \n

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\n \n \n

\n \n\n \n \n \n \n \n \n Tuning Cage Dimension in Clathrate Hydrates for Hydrogen Multiple Occupancy.\n \n \n \n \n\n\n \n Koh, D.; Kang, H.; Jeon, J.; Ahn, Y.; Park, Y.; Kim, H.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry C, 118(6): 3324–3330. February 2014.\n \n\n\n\n
\n\n\n\n \n \n $\"Tuning$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

\n

@article{koh_tuning_2014,\n\ttitle = {Tuning {Cage} {Dimension} in {Clathrate} {Hydrates} for {Hydrogen} {Multiple} {Occupancy}},\n\tvolume = {118},\n\tissn = {1932-7447},\n\turl = {https://doi.org/10.1021/jp410632q},\n\tdoi = {10.1021/jp410632q},\n\tabstract = {As hydrogen molecules enter the clathrate hydrate body, the ubiquitous dodecahedral cavity (512) is too small to allow anything but single occupancy thermodynamically. The possibility that H2 double occupancy can occur in the dodecahedral cavity has been suggested and is still under debate. Here we uncover the unique feature of multiple occupancy of the hydrogen molecule in a dodecahedral cavity as induced by tuning the cage dimensions. The guest promoter population in the hydrate matrix spontaneously controls the degree of molecular hydrogen storage by tuning the cage dimensions. Our analysis combined with computational study reveals that only ∼1\\% expansion (∼3\\% in volume) of the cage dimensions is sufficient to provide thermodynamically stable room for double occupancy in the dodecahedral cavity. The findings in this research provide a strategy for doubling the hydrogen population in dodecahedral cavities in structure II hydrates.},\n\tnumber = {6},\n\turldate = {2026-01-29},\n\tjournal = {The Journal of Physical Chemistry C},\n\tpublisher = {American Chemical Society},\n\tauthor = {Koh, Dong-Yeun and Kang, Hyery and Jeon, Jiwon and Ahn, Yun-Ho and Park, Youngjune and Kim, Hyungjun and Lee, Huen},\n\tmonth = feb,\n\tyear = {2014},\n\tpages = {3324--3330},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Effect of thermal history on lattice expansion and guest distribution of tetrahydrofuran clathrate hydrate with air molecules.\n \n \n \n \n\n\n \n Koh, D.; Kang, H.; Park, Y.; and Lee, H.\n\n\n \n\n\n\n Chemical Physics Letters, 597: 16–19. March 2014.\n \n\n\n\n
\n\n\n\n \n \n $\"Effect$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

\n

@article{koh_effect_2014,\n\ttitle = {Effect of thermal history on lattice expansion and guest distribution of tetrahydrofuran clathrate hydrate with air molecules},\n\tvolume = {597},\n\tissn = {0009-2614},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0009261414000797},\n\tdoi = {10.1016/j.cplett.2014.02.011},\n\tabstract = {Air hydrates can form under the high-pressure and low-temperature conditions found in deep ice sheets of the Arctic and Antarctic regions. These hydrates can play a major role in the analysis of data gathered in these regions. Through this Letter, we investigate on thermal expansivity and guest-molecule dynamics of THF+air clathrate hydrate provided by a neutron scattering experiment and address two noteworthy features. First is the effect of thermal history on host water-lattice expansion and related gas-inclusion effect on thermal expansion coefficients. Second is the changes in guest-molecule distribution during the degassing process caused by thermal stimulation.},\n\turldate = {2026-01-29},\n\tjournal = {Chemical Physics Letters},\n\tauthor = {Koh, Dong-Yeun and Kang, Hyery and Park, Youngjune and Lee, Huen},\n\tmonth = mar,\n\tyear = {2014},\n\tpages = {16--19},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Nondestructive natural gas hydrate recovery driven by air and carbon dioxide.\n \n \n \n \n\n\n \n Kang, H.; Koh, D.; and Lee, H.\n\n\n \n\n\n\n Scientific Reports, 4(1): 6616. October 2014.\n \n\n\n\n
\n\n\n\n \n \n $\"Nondestructive$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n\n\n\n

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@article{kang_nondestructive_2014,\n\ttitle = {Nondestructive natural gas hydrate recovery driven by air and carbon dioxide},\n\tvolume = {4},\n\tcopyright = {2014 The Author(s)},\n\tissn = {2045-2322},\n\turl = {https://www.nature.com/articles/srep06616},\n\tdoi = {10.1038/srep06616},\n\tabstract = {Current technologies for production of natural gas hydrates (NGH), which include thermal stimulation, depressurization and inhibitor injection, have raised concerns over unintended consequences. The possibility of catastrophic slope failure and marine ecosystem damage remain serious challenges to safe NGH production. As a potential approach, this paper presents air-driven NGH recovery from permeable marine sediments induced by simultaneous mechanisms for methane liberation (NGH decomposition) and CH4-air or CH4-CO2/air replacement. Air is diffused into and penetrates NGH and, on its surface, forms a boundary between the gas and solid phases. Then spontaneous melting proceeds until the chemical potentials become equal in both phases as NGH depletion continues and self-regulated CH4-air replacement occurs over an arbitrary point. We observed the existence of critical methane concentration forming the boundary between decomposition and replacement mechanisms in the NGH reservoirs. Furthermore, when CO2 was added, we observed a very strong, stable, self-regulating process of exchange (CH4 replaced by CO2/air; hereafter CH4-CO2/air) occurring in the NGH. The proposed process will work well for most global gas hydrate reservoirs, regardless of the injection conditions or geothermal gradient.},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2026-01-29},\n\tjournal = {Scientific Reports},\n\tpublisher = {Nature Publishing Group},\n\tauthor = {Kang, Hyery and Koh, Dong-Yeun and Lee, Huen},\n\tmonth = oct,\n\tyear = {2014},\n\tkeywords = {Chemical engineering, Environmental chemistry},\n\tpages = {6616},\n}\n\n\n\n

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\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Effect of Molecular Nitrogen on Multiple Hydrogen Occupancy in Clathrate Hydrates.\n \n \n \n \n\n\n \n Park, S.; Koh, D.; Kang, H.; Lee, J. W.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry C, 118(35): 20203–20208. September 2014.\n \n\n\n\n
\n\n\n\n \n \n $\"Effect$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

\n

@article{park_effect_2014,\n\ttitle = {Effect of {Molecular} {Nitrogen} on {Multiple} {Hydrogen} {Occupancy} in {Clathrate} {Hydrates}},\n\tvolume = {118},\n\tissn = {1932-7447},\n\turl = {https://doi.org/10.1021/jp5061254},\n\tdoi = {10.1021/jp5061254},\n\tabstract = {Multiple H2 occupancy in confined cages has been explored for the purpose of enhancing storage capacity. Furthermore, balancing the formation pressure with high storage capacity is one of the most significant factors. Here, we demonstrate the use of binary (LGM + N2) hydrates to capture hydrogen clusters under relatively mild conditions, even observing double H2 occupancy in small cages. The cage occupancy and structures of hydrates were identified by the Raman spectroscopic analysis and high-resolution powder diffraction. The reaction product of binary (LGM + N2) hydrates with H2 molecules suggests the possibility of multiple H2 occupancy in both small (512) and large (51264) cages at relatively low pressures. Also, the lattice parameter decreases with an increase in H2 occupancy. The unique and abnormal role of N2 as a preoccupied coguest significantly affects the H2 population in a crystalline hydrate matrix and further lowers the pressure for structure stabilization.},\n\tnumber = {35},\n\turldate = {2026-01-29},\n\tjournal = {The Journal of Physical Chemistry C},\n\tpublisher = {American Chemical Society},\n\tauthor = {Park, Seongmin and Koh, Dong-Yeun and Kang, Hyery and Lee, Jae W. and Lee, Huen},\n\tmonth = sep,\n\tyear = {2014},\n\tpages = {20203--20208},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n 2013\n \n \n (3)\n \n \n

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\n \n \n

\n \n\n \n \n \n \n \n \n Physicochemical properties of semi-clathrate hydrates as revealed by terahertz time-domain spectroscopy.\n \n \n \n \n\n\n \n Kang, H.; Jung, S.; Koh, D.; Ahn, Y.; Park, S.; Park, J.; and Lee, H.\n\n\n \n\n\n\n Chemical Physics Letters, 587: 14–19. November 2013.\n \n\n\n\n
\n\n\n\n \n \n $\"Physicochemical$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{kang_physicochemical_2013,\n\ttitle = {Physicochemical properties of semi-clathrate hydrates as revealed by terahertz time-domain spectroscopy},\n\tvolume = {587},\n\tissn = {0009-2614},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0009261413011962},\n\tdoi = {10.1016/j.cplett.2013.09.041},\n\tabstract = {The physical properties of semi-clathrate hydrates formed with tetra-n-butylammonium fluoride (TBAF) and tetra-n-butylammonium bromide (TBAB) in the temperature range of 83–263K were studied using terahertz time-domain spectroscopy (THz-TDS). From our measurements, the semi-clathrate hydrate of TBAF shows the general trend of slightly higher refractive indices than the TBAB semi-clathrate hydrate. Furthermore, significant differences in the absorption coefficients and dielectric constants between the TBAF and TBAB semi-clathrate hydrates are discovered. These originate from fundamental structural/compositional differences between the hydrates which are related to their gas storage capacities.},\n\turldate = {2026-01-29},\n\tjournal = {Chemical Physics Letters},\n\tauthor = {Kang, Hyery and Jung, Seonghoon and Koh, Dong-Yeun and Ahn, Yun-Ho and Park, Seongmin and Park, Jaehun and Lee, Huen},\n\tmonth = nov,\n\tyear = {2013},\n\tpages = {14--19},\n}\n\n\n\n

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\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Guest molecule dynamics and guest-specific degassing phenomenon of binary gas hydrate investigated by terahertz time-domain spectroscopy.\n \n \n \n \n\n\n \n Koh, D.; Kang, H.; Park, J.; Jung, S.; Han, D.; Park, J.; and Lee, H.\n\n\n \n\n\n\n RSC Advances, 3(23): 8857–8863. May 2013.\n \n\n\n\n
\n\n\n\n \n \n $\"Guest$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

\n

@article{koh_guest_2013,\n\ttitle = {Guest molecule dynamics and guest-specific degassing phenomenon of binary gas hydrate investigated by terahertz time-domain spectroscopy},\n\tvolume = {3},\n\tissn = {2046-2069},\n\turl = {https://pubs.rsc.org/en/content/articlelanding/2013/ra/c3ra40516h},\n\tdoi = {10.1039/C3RA40516H},\n\tabstract = {The behaviour of clathrate hydrates in the THz region could provide useful information about inclusion compounds. In this study, terahertz time-domain spectroscopy (THz-TDS) revealed the dynamics of gaseous guest molecules inside the water framework of a clathrate hydrate. Distinct footprints of each gaseous molecule (CH4, H2 and O2) inside the gas hydrate lattice were analysed. Thermally stimulated gas hydrates give out gas molecules (secondary guests) to remain secure, and each gas has a specific degassing temperature. In this way, they form the stable sII THF hydrate with empty small cages (512) which can survive at temperatures up to 278 K.},\n\tlanguage = {en},\n\tnumber = {23},\n\turldate = {2026-01-29},\n\tjournal = {RSC Advances},\n\tpublisher = {The Royal Society of Chemistry},\n\tauthor = {Koh, Dong-Yeun and Kang, Hyery and Park, Juwoon and Jung, Seonghoon and Han, Daehoon and Park, Jaehun and Lee, Huen},\n\tmonth = may,\n\tyear = {2013},\n\tpages = {8857--8863},\n}\n\n\n\n\n\n\n\n

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\n\n\n

\n \n\n \n \n \n \n \n \n Multiple guest occupancy in clathrate hydrates and its significance in hydrogen storage.\n \n \n \n \n\n\n \n Koh, D.; Kang, H.; and Lee, H.\n\n\n \n\n\n\n Chemical Communications, 49(60): 6782–6784. July 2013.\n \n\n\n\n
\n\n\n\n \n \n $\"Multiple$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{koh_multiple_2013,\n\ttitle = {Multiple guest occupancy in clathrate hydrates and its significance in hydrogen storage},\n\tvolume = {49},\n\tissn = {1364-548X},\n\turl = {https://pubs.rsc.org/en/content/articlelanding/2013/cc/c3cc43376e},\n\tdoi = {10.1039/C3CC43376E},\n\tabstract = {We report a new concept of structural transformation combined with tuning phenomena which together result in a significant increase in the hydrogen storage capacity in an icy material. It is necessary to investigate the use of a fully water-soluble structure H (sH) former so as to observe how hydrogen molecules are stably loaded into hydrate cages.},\n\tlanguage = {en},\n\tnumber = {60},\n\turldate = {2026-01-29},\n\tjournal = {Chemical Communications},\n\tpublisher = {The Royal Society of Chemistry},\n\tauthor = {Koh, Dong-Yeun and Kang, Hyery and Lee, Huen},\n\tmonth = jul,\n\tyear = {2013},\n\tpages = {6782--6784},\n}\n\n\n\n

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\n \n 2012\n \n \n (7)\n \n \n

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\n \n \n

\n \n\n \n \n \n \n \n \n Experimental verification of anomalous chloride enrichment related to methane hydrate formation in deep-sea sediments.\n \n \n \n \n\n\n \n Seol, J.; Koh, D.; Cha, M.; Shin, W.; Lee, Y.; Kim, J.; Lee, J.; and Lee, H.\n\n\n \n\n\n\n AIChE Journal, 58(1): 322–328. 2012.\n _eprint: https://aiche.onlinelibrary.wiley.com/doi/pdf/10.1002/aic.12555\n\n\n\n
\n\n\n\n \n \n $\"Experimental$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{seol_experimental_2012,\n\ttitle = {Experimental verification of anomalous chloride enrichment related to methane hydrate formation in deep-sea sediments},\n\tvolume = {58},\n\tcopyright = {Copyright © 2011 American Institute of Chemical Engineers (AIChE)},\n\tissn = {1547-5905},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/aic.12555},\n\tdoi = {10.1002/aic.12555},\n\tabstract = {Anomalous chloride concentration enrichment has been detected in marine sediments comprising methane hydrates (MHs). In this study, we designed an electric circuit system linked to the high-pressure resistance cell in which the chloride ion concentration can be directly measured within reliable accuracy under in situ conditions of the deep-sea floor pressure and temperature. Chloride concentration increased under a fast MH formation rate, but no noticeable concentration change was detected under a relatively low-rate. Furthermore, we suggested that the MH formation rate must be maintained at least ∼102 mol m−2 yr−1 so as to efficiently enrich chlorides and retain the acquired chlorinity. The present experimental system dose not fully reflect the relatively minor effective variables such as vertical advections in real system, but the results seem to be sufficient for revealing chloride enrichment phenomena induced by fast MH formation rate with free methane gas. © 2011 American Institute of Chemical Engineers AIChE J, 2012},\n\tlanguage = {en},\n\tnumber = {1},\n\turldate = {2026-01-30},\n\tjournal = {AIChE Journal},\n\tauthor = {Seol, Jiwoong and Koh, Dong-Yeun and Cha, Minjun and Shin, Woongchul and Lee, Young-Joo and Kim, Ji-Hoon and Lee, Jaehyoung and Lee, Huen},\n\tyear = {2012},\n\tnote = {\\_eprint: https://aiche.onlinelibrary.wiley.com/doi/pdf/10.1002/aic.12555},\n\tkeywords = {chloride enrichment, ion exclusion, methane hydrate, methane hydrate formation rate},\n\tpages = {322--328},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Phase equilibrium measurements and the tuning behavior of new sII clathrate hydrates.\n \n \n \n \n\n\n \n Shin, W.; Park, S.; Ro, H.; Koh, D.; Seol, J.; and Lee, H.\n\n\n \n\n\n\n The Journal of Chemical Thermodynamics, 44(1): 20–25. January 2012.\n \n\n\n\n
\n\n\n\n \n \n $\"Phase$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{shin_phase_2012,\n\ttitle = {Phase equilibrium measurements and the tuning behavior of new {sII} clathrate hydrates},\n\tvolume = {44},\n\tissn = {0021-9614},\n\turl = {https://www.sciencedirect.com/science/article/pii/S0021961411002941},\n\tdoi = {10.1016/j.jct.2011.08.018},\n\tabstract = {We suggest two types of new amine-type sII formers: pyrrolidine and piperidine. These guest compounds fail to form clathrate hydrate structures with host water, but instead have to combine with light gaseous guest molecules (methane) for enclathration. First, two binary clathrate hydrates of (pyrrolidine+methane) and (piperidine+methane) were synthesized at various amine concentrations. 13C NMR and Raman analysis were done to identify the clathrate hydrate structure and guest distribution over sII-S and sII-L cages. XRD was also used to find the exact structure and corresponding cell parameters. At a dilute pyrrolidine concentration of less than 5.56mol\\%, the tuning phenomenon is observed such that methane molecules surprisingly occupy sII-L cages. At the critical guest concentration of about 0.1mol\\%, the cage occupancy ratio reaches the maximum of approximately 0.5. At very dilute guest concentration below 0.1mol\\%, the methane molecules fail to occupy large cages on account of their rarefied distribution in the network. Direct-release experiments were performed to determine the actual guest compositions in the clathrate hydrate phases. Finally, we measured the clathrate hydrate phase equilibria of (pyrrolidine+methane) and (piperidine+methane).},\n\tnumber = {1},\n\turldate = {2026-01-30},\n\tjournal = {The Journal of Chemical Thermodynamics},\n\tauthor = {Shin, Woongchul and Park, Seongmin and Ro, Hyeyoon and Koh, Dong-Yeun and Seol, Jiwoong and Lee, Huen},\n\tmonth = jan,\n\tyear = {2012},\n\tkeywords = {Gas hydrate, Piperidine, Pyrrolidine, Tuning clathrate hydrate, sII hydrate},\n\tpages = {20--25},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Spectroscopic Confirmation of Metastable Structure Formation Occurring in Natural Gas Hydrates.\n \n \n \n \n\n\n \n Shin, W.; Park, S.; Ro, H.; Koh, D.; Seol, J.; and Lee, H.\n\n\n \n\n\n\n Chemistry – An Asian Journal, 7(10): 2235–2238. 2012.\n _eprint: https://aces.onlinelibrary.wiley.com/doi/pdf/10.1002/asia.201200040\n\n\n\n
\n\n\n\n \n \n $\"Spectroscopic$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{shin_spectroscopic_2012,\n\ttitle = {Spectroscopic {Confirmation} of {Metastable} {Structure} {Formation} {Occurring} in {Natural} {Gas} {Hydrates}},\n\tvolume = {7},\n\tcopyright = {Copyright © 2012 WILEY-VCH Verlag GmbH \\& Co. KGaA, Weinheim},\n\tissn = {1861-471X},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/asia.201200040},\n\tdoi = {10.1002/asia.201200040},\n\tabstract = {Get into it! During gas hydrate formation, competition of kinetic preference and thermodynamic stability determines the structure. Kinetically favored sII transformed to thermodynamically favored sI and sH phases. The sH phase is kinetically preferred over the sI phase because of the existence of large cages that can be filled with guest molecules.},\n\tnumber = {10},\n\turldate = {2026-01-30},\n\tjournal = {Chemistry – An Asian Journal},\n\tauthor = {Shin, Woongchul and Park, Seongmin and Ro, Hyeyoon and Koh, Dong-Yeun and Seol, Jiwoong and Lee, Huen},\n\tyear = {2012},\n\tnote = {\\_eprint: https://aces.onlinelibrary.wiley.com/doi/pdf/10.1002/asia.201200040},\n\tkeywords = {environmental chemistry, host–guest systems, hydrates, kinetics, phase transitions},\n\tpages = {2235--2238},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Structure Transition from Semi- to True Clathrate Hydrates Induced by CH4 Enclathration.\n \n \n \n \n\n\n \n Shin, W.; Park, S.; Lee, J.; Seo, Y.; Koh, D.; Seol, J.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry C, 116(31): 16352–16357. August 2012.\n \n\n\n\n
\n\n\n\n \n \n $\"Structure$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{shin_structure_2012,\n\ttitle = {Structure {Transition} from {Semi}- to {True} {Clathrate} {Hydrates} {Induced} by {CH4} {Enclathration}},\n\tvolume = {116},\n\tissn = {1932-7447},\n\turl = {https://doi.org/10.1021/jp303719r},\n\tdoi = {10.1021/jp303719r},\n\tabstract = {Diethylamine and n-propylamine, known as semiclathrate hydrate formers, are found to show structural transition when a help gas, CH4, was introduced. The diethylamine·8.67H2O semiclathrate hydrates (orthorhombic Pbcn) were changed to sH type (hexagonal P6/mmm) true clathrate hydrates, while the n-propylamine·6.5H2O semiclathrate hydrates (monoclinic P21/n) turned into sII clathrate hydrates (cubic Fd3m). Irregularly distorted voids in the semiclathrate hydrate phases were transformed to conventional ones after changing their structures to gas hydrate phases. The different shape of large voids in the semiclathrate hydrates changed to the typical shape of sH or sII large voids, and pentagonal dodecahedra were formed so as to capture CH4 molecules. Transition pattern and molecular behavior from semiclathrate hydrate to true clathrate hydrates were analyzed with PXRD, NMR, and Raman methods. In addition, the liquid mixture–CH4 hydrates–CH4 vapor (L–H–V) thermodynamic equilibrium conditions were measured.},\n\tnumber = {31},\n\turldate = {2026-01-30},\n\tjournal = {The Journal of Physical Chemistry C},\n\tpublisher = {American Chemical Society},\n\tauthor = {Shin, Woongchul and Park, Seongmin and Lee, Jong-Won and Seo, Yongwon and Koh, Dong-Yeun and Seol, Jiwoong and Lee, Huen},\n\tmonth = aug,\n\tyear = {2012},\n\tpages = {16352--16357},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Spectroscopic Observation of Na Cations Entrapped in Small Cages of sII Propane Hydrate.\n \n \n \n \n\n\n \n Seol, J.; Shin, W.; Koh, D.; Kang, H.; Sung, B.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry C, 116(1): 1439–1444. January 2012.\n \n\n\n\n
\n\n\n\n \n \n $\"Spectroscopic$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{seol_spectroscopic_2012,\n\ttitle = {Spectroscopic {Observation} of {Na} {Cations} {Entrapped} in {Small} {Cages} of {sII} {Propane} {Hydrate}},\n\tvolume = {116},\n\tissn = {1932-7447},\n\turl = {https://doi.org/10.1021/jp207450e},\n\tdoi = {10.1021/jp207450e},\n\tabstract = {Although numerous studies have been conducted on various ionic clathrate hydrates, in spite of its potential importance the inclusion of metal cations in continuous water-host frameworks has not yet been clearly identified by direct spectroscopic evidence. Here, a key question arises as to whether the small alkali metals such as Na+ can be entrapped because they are considered to be too small to be stabilized in the hydrate cages. In this study, we first suggested spectroscopic evidence for the enclathration of Na+ in a small cage of sII propane hydrate. First, we checked the overall structure of sII propane hydrate incorporated with NaSO3CH3 and NaSO3NH2 with powder XRD and 13C NMR. Next, we revealed the difference of chemical shift of 23Na between Ih and sII hydrate phases with solid-state 23Na MAS NMR as direct evidence of entrapped Na+ in 512 cages. In addition, we also checked 13C MAS NMR of the CH3SO3– anion and found that Na+ cations in a small cage could be stabilized with an enclathrated CH3SO3– anion in a large cage. To the best of our knowledge, it is the first discovery of small alkali cations stabilized in a continuous hydrate phase. Finally, we would like to emphasize that clathrate hydrate including small alkali metals can be designed and synthesized for its potential applications to various types of energy devices using its ionic mobility through the hydrate channel.},\n\tnumber = {1},\n\turldate = {2026-01-30},\n\tjournal = {The Journal of Physical Chemistry C},\n\tpublisher = {American Chemical Society},\n\tauthor = {Seol, Jiwoong and Shin, Woongchul and Koh, Dong-Yeun and Kang, Hyery and Sung, Boram and Lee, Huen},\n\tmonth = jan,\n\tyear = {2012},\n\tpages = {1439--1444},\n}\n\n\n\n\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Recovery of Methane from Gas Hydrates Intercalated within Natural Sediments Using CO2 and a CO2/N2 Gas Mixture.\n \n \n \n \n\n\n \n Koh, D.; Kang, H.; Kim, D.; Park, J.; Cha, M.; and Lee, H.\n\n\n \n\n\n\n ChemSusChem, 5(8): 1443–1448. 2012.\n _eprint: https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/cssc.201100644\n\n\n\n
\n\n\n\n \n \n $\"Recovery$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n\n\n

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@article{koh_recovery_2012,\n\ttitle = {Recovery of {Methane} from {Gas} {Hydrates} {Intercalated} within {Natural} {Sediments} {Using} {CO2} and a {CO2}/{N2} {Gas} {Mixture}},\n\tvolume = {5},\n\tcopyright = {Copyright © 2012 WILEY-VCH Verlag GmbH \\& Co. KGaA, Weinheim},\n\tissn = {1864-564X},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1002/cssc.201100644},\n\tdoi = {10.1002/cssc.201100644},\n\tabstract = {The direct recovery of methane from massive methane hydrates (MHs), artificial MH-bearing clays, and natural MH-bearing sediments is demonstrated, using either CO2 or a CO2/N2 gas mixture (20 mol \\% of CO2 and 80 mol \\% of N2, reproducing flue gas from a power plant) for methane replacement in complex marine systems. Natural gas hydrates (NGHs) can be converted into CO2 hydrate by a swapping mechanism. The overall process serves a dual purpose: it is a means of sustainable energy-source exploitation and greenhouse-gas sequestration. In particular, scant attention has been paid to the natural sediment clay portion in deep-sea gas hydrates, which is capable of storing a tremendous amount of NGH. The clay interlayer provides a unique chemical–physical environment for gas hydrates. Herein, for the first time, we pull out methane from intercalated methane hydrates in a clay interlayer using CO2 and a CO2/N2 gas mixture. The results of this study are expected to provide an essential physicochemical background required for large-scale NGH production under the seabed.},\n\tlanguage = {en},\n\tnumber = {8},\n\turldate = {2026-01-30},\n\tjournal = {ChemSusChem},\n\tauthor = {Koh, Dong-Yeun and Kang, Hyery and Kim, Dae-Ok and Park, Juwoon and Cha, Minjun and Lee, Huen},\n\tyear = {2012},\n\tnote = {\\_eprint: https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/cssc.201100644},\n\tkeywords = {clathrates, clays, environmental chemistry, hydrates, methane},\n\tpages = {1443--1448},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Atomic Hydrogen Production from Semi-clathrate Hydrates.\n \n \n \n \n\n\n \n Koh, D.; Kang, H.; Park, J.; Shin, W.; and Lee, H.\n\n\n \n\n\n\n Journal of the American Chemical Society, 134(12): 5560–5562. March 2012.\n \n\n\n\n
\n\n\n\n \n \n $\"Atomic$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{koh_atomic_2012,\n\ttitle = {Atomic {Hydrogen} {Production} from {Semi}-clathrate {Hydrates}},\n\tvolume = {134},\n\tissn = {0002-7863},\n\turl = {https://doi.org/10.1021/ja300567b},\n\tdoi = {10.1021/ja300567b},\n\tabstract = {Atomic hydrogen has received recent attention because of its potential role in energy devices, silicon devices, artificial photosynthesis, hydrogen storage, and so forth. Here, we propose a highly efficient route for producing atomic hydrogen using semi-clathrate hydrates. Two major hydrogen radical sources, derived from guest/host materials, are closely examined.},\n\tnumber = {12},\n\turldate = {2026-01-30},\n\tjournal = {Journal of the American Chemical Society},\n\tpublisher = {American Chemical Society},\n\tauthor = {Koh, Dong-Yeun and Kang, Hyery and Park, Juwoon and Shin, Woongchul and Lee, Huen},\n\tmonth = mar,\n\tyear = {2012},\n\tpages = {5560--5562},\n}\n\n\n\n\n\n\n\n

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\n \n 2011\n \n \n (4)\n \n \n

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\n \n\n \n \n \n \n \n \n Water-Soluble Structure H Clathrate Hydrate Formers.\n \n \n \n \n\n\n \n Shin, W.; Park, S.; Koh, D.; Seol, J.; Ro, H.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry C, 115(38): 18885–18889. September 2011.\n \n\n\n\n
\n\n\n\n \n \n $\"Water-Soluble$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{shin_water-soluble_2011,\n\ttitle = {Water-{Soluble} {Structure} {H} {Clathrate} {Hydrate} {Formers}},\n\tvolume = {115},\n\tissn = {1932-7447},\n\turl = {https://doi.org/10.1021/jp205433j},\n\tdoi = {10.1021/jp205433j},\n\tabstract = {Hexamethyleneimine, 1-methylpiperidine, 2-methylpiperidine, 3-methylpiperidine, and 4-methylpiperidine as isomers of C6H13N were revealed as new sH clathrate hydrate forming molecules. They show fully soluble characteristics to water, whereas already known sH formers such as methylcyclohexane and 2,2-dimethylbutane (neohexane) are immiscible or very slightly soluble to water. The L–H–V equilibrium P–T behavior of these new sH clathrate hydrates shows a tendency to shift to much milder conditions than already known ones. We particularly note that 1-methylpiperidine appears to be the best for promotion. To verify the distribution of CH4 molecules and crystal structure of clathrate hydrates, 600 MHz solid-state NMR, Raman spectroscopy, and XRD pattern analysis were conducted. These noticeable properties of new formers are expected to open new research fields to the hydrate community and contribute to hydrate-based technological applications with high energy efficiency.},\n\tnumber = {38},\n\turldate = {2026-01-30},\n\tjournal = {The Journal of Physical Chemistry C},\n\tpublisher = {American Chemical Society},\n\tauthor = {Shin, Woongchul and Park, Seongmin and Koh, Dong-Yeun and Seol, Jiwoong and Ro, Hyeyoon and Lee, Huen},\n\tmonth = sep,\n\tyear = {2011},\n\tpages = {18885--18889},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Metastability of Ethane Clathrate Hydrate Induced by [Co(NH3)6]3+ Complex.\n \n \n \n \n\n\n \n Shin, W.; Shin, K.; Seol, J.; Koh, D.; Park, S.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry C, 115(5): 2558–2562. February 2011.\n \n\n\n\n
\n\n\n\n \n \n $\"Metastability$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{shin_metastability_2011,\n\ttitle = {Metastability of {Ethane} {Clathrate} {Hydrate} {Induced} by [{Co}({NH3})6]3+ {Complex}},\n\tvolume = {115},\n\tissn = {1932-7447},\n\turl = {https://doi.org/10.1021/jp1094273},\n\tdoi = {10.1021/jp1094273},\n\tabstract = {The metal complex of [Co(NH3)6]3+ is introduced to C2H6 hydrate to confirm its possible inclusion in hydrogen-bonded water cages and the occurrence of metastable structure. The 13C NMR spectra of C2H6 + ([Co(NH3)6]Cl3 + 6NaOH in D2O) hydrate confirmed a new peak at 6.5 ppm matching with C2H6 in sII-L cages. The retarded appearance of metastable sII phase is due to brine rejection of the cobalt complex occurring during solution freezing. The anions of OH− and F− were found to be incorporated in the host water cage framework, providing proton-deficient sites. The ionic conductivity of the frozen [Co(NH3)6]3+ solution increased up to 20-fold after ethane hydrate formation, implying the incorporation of F− into the host lattice. A notable finding of this work is that the metastability occurs only when the cobalt complex is in the presence of anions such as OH− and F−.},\n\tnumber = {5},\n\turldate = {2026-01-30},\n\tjournal = {The Journal of Physical Chemistry C},\n\tpublisher = {American Chemical Society},\n\tauthor = {Shin, Woongchul and Shin, Kyuchul and Seol, Jiwoong and Koh, Dong-Yeun and Park, Seongmin and Lee, Huen},\n\tmonth = feb,\n\tyear = {2011},\n\tpages = {2558--2562},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Thermal Expansivity of Ionic Clathrate Hydrates Including Gaseous Guest Molecules.\n \n \n \n \n\n\n \n Shin, K.; Lee, W.; Cha, M.; Koh, D.; Choi, Y. N.; Lee, H.; Son, B. S.; Lee, S.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry B, 115(5): 958–963. February 2011.\n \n\n\n\n
\n\n\n\n \n \n $\"Thermal$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{shin_thermal_2011,\n\ttitle = {Thermal {Expansivity} of {Ionic} {Clathrate} {Hydrates} {Including} {Gaseous} {Guest} {Molecules}},\n\tvolume = {115},\n\tissn = {1520-6106},\n\turl = {https://doi.org/10.1021/jp110737q},\n\tdoi = {10.1021/jp110737q},\n\tabstract = {Although thermal expansion is a key factor in relation to the host−guest interaction of clathrate hydrates, few studies have investigated the thermal behavior of ionic clathrate hydrates. The existence of ionic species in these hydrates creates a unique host−guest interaction compared to that of nonionic clathrate hydrates. It was revealed that X-ray diffraction cannot be used for research of tetramethylammonium hydroxide clathrate hydrates due to damage of the cations by the X-ray, which results in abnormal thermal expansion of the ionic clathrate hydrates. Hence, in the present work, the thermal expansivities of binary sII Me4NOD·16D2O and sI DClO4·5.5D2O were measured by neutron powder diffraction (NPD) in order to shed light on their thermal behavior. General correlations for the thermal behaviors of given structures were established and lattice expansions depending on the guests were compared between ionic and nonionic clathrate hydrates. The peculiar change in the thermal expansivity of binary DClO4·5.5D2O was also considered in relation to the host−guest configuration.},\n\tnumber = {5},\n\turldate = {2026-01-30},\n\tjournal = {The Journal of Physical Chemistry B},\n\tpublisher = {American Chemical Society},\n\tauthor = {Shin, Kyuchul and Lee, Wonhee and Cha, Minjun and Koh, Dong-Yeun and Choi, Yong Nam and Lee, Heeju and Son, Bae Soon and Lee, Seongsu and Lee, Huen},\n\tmonth = feb,\n\tyear = {2011},\n\tpages = {958--963},\n}\n\n\n\n\n\n\n\n

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\n \n\n \n \n \n \n \n \n Abnormal methane occupancy of natural gas hydrates in deep sea floor sediments.\n \n \n \n \n\n\n \n Yeon, S.; Seol, J.; Koh, D.; Seo, Y.; Park, K.; Huh, D.; Lee, J.; and Lee, H.\n\n\n \n\n\n\n Energy & Environmental Science, 4(2): 421–424. February 2011.\n \n\n\n\n
\n\n\n\n \n \n $\"Abnormal$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{yeon_abnormal_2011,\n\ttitle = {Abnormal methane occupancy of natural gas hydrates in deep sea floor sediments},\n\tvolume = {4},\n\tissn = {1754-5706},\n\turl = {https://pubs.rsc.org/en/content/articlelanding/2011/ee/c0ee00355g},\n\tdoi = {10.1039/C0EE00355G},\n\tabstract = {Natural gas hydrates were recovered from near-seafloor sediments and analysed to compare two distinctive methane inclusion phenomena. We document the first observation of abnormal methane occupancy in sediment-rich NGH deposits.},\n\tlanguage = {en},\n\tnumber = {2},\n\turldate = {2026-01-30},\n\tjournal = {Energy \\& Environmental Science},\n\tpublisher = {The Royal Society of Chemistry},\n\tauthor = {Yeon, Sun-Hwa and Seol, Jiwoong and Koh, Dong-Yeun and Seo, Young-ju and Park, Keun-Pil and Huh, Dae-Gee and Lee, Jaehyoung and Lee, Huen},\n\tmonth = feb,\n\tyear = {2011},\n\tpages = {421--424},\n}\n\n\n\n\n\n\n\n

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\n \n 2010\n \n \n (2)\n \n \n

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\n \n\n \n \n \n \n \n \n Superoxide Ions Entrapped in Water Cages of Ionic Clathrate Hydrates.\n \n \n \n \n\n\n \n Cha, M.; Shin, K.; Kwon, M.; Koh, D.; Sung, B.; and Lee, H.\n\n\n \n\n\n\n Journal of the American Chemical Society, 132(11): 3694–3696. March 2010.\n \n\n\n\n
\n\n\n\n \n \n $\"Superoxide$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{cha_superoxide_2010,\n\ttitle = {Superoxide {Ions} {Entrapped} in {Water} {Cages} of {Ionic} {Clathrate} {Hydrates}},\n\tvolume = {132},\n\tissn = {0002-7863},\n\turl = {https://doi.org/10.1021/ja1004762},\n\tdoi = {10.1021/ja1004762},\n\tabstract = {In the present work, we first described the stable entrapment of the superoxide ions in γ-irradiated (Me4NOH + O2) clathrate hydrate. Owing to peculiar direct guest−guest ionic interaction, the lattice structure of γ-irradiated (Me4NOH + O2) clathrate hydrate shows significant change of lattice contraction behavior even at relatively high temperature (120 K). Such findings are expected to provide useful information for a better understanding of unrevealed nature (such as icy nanoreactor concept, ice-based functional material synthesis and lattice tuning by specific ionic guests) of clathrate hydrate fields.},\n\tnumber = {11},\n\turldate = {2026-01-30},\n\tjournal = {Journal of the American Chemical Society},\n\tpublisher = {American Chemical Society},\n\tauthor = {Cha, Minjun and Shin, Kyuchul and Kwon, Minchul and Koh, Dong-Yeun and Sung, Boram and Lee, Huen},\n\tmonth = mar,\n\tyear = {2010},\n\tpages = {3694--3696},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Generalized Cage Occupancy Behavior in the Binary Clathrate Hydrates.\n \n \n \n \n\n\n \n Seol, J.; Lee, J.; Shin, W.; Koh, D.; Lee, J.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry C, 114(41): 17960–17963. October 2010.\n \n\n\n\n
\n\n\n\n \n \n $\"Generalized$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{seol_generalized_2010,\n\ttitle = {Generalized {Cage} {Occupancy} {Behavior} in the {Binary} {Clathrate} {Hydrates}},\n\tvolume = {114},\n\tissn = {1932-7447},\n\turl = {https://doi.org/10.1021/jp105397k},\n\tdoi = {10.1021/jp105397k},\n\tabstract = {The competitive inclusion behavior of multiguests in the cages of clathrate hydrates is not yet well understood in spite of its significant importance in both scientific and technological fields. Here, we derive simple and generalized expressions related to cage occupancy ratios of binary clathrate hydrates, measure the cage occupancy ratios, and finally compare the proposed expressions with the experimental results. The present approaches cover three independent categories: the binary guests competitively occupy (1) both small and large cages, (2) only small cages, and (3) only large cages. In addition, we demonstrate that cage occupancy ratio is a simple but powerful variable that indicates the guest behaviors. More importantly, the present approaches only need to have the precise composition measurements to reveal the general nature of guest popularity in cages, while the original van der Waals−Platteeuw model requires several complex variables such as Langmuir constants and fugacities as indispensable prerequisites. The present outcomes might play a significant role in understanding guest occupancy details and, furthermore, provide clues for designing and synthesizing the most efficient hydrate structures to store gaseous molecules for a specific purpose.},\n\tnumber = {41},\n\turldate = {2026-01-30},\n\tjournal = {The Journal of Physical Chemistry C},\n\tpublisher = {American Chemical Society},\n\tauthor = {Seol, Jiwoong and Lee, Jong-Won and Shin, Woong-Chul and Koh, Dong-Yeun and Lee, Jaehyoung and Lee, Huen},\n\tmonth = oct,\n\tyear = {2010},\n\tpages = {17960--17963},\n}\n\n\n\n

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\n \n 2009\n \n \n (2)\n \n \n

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\n \n\n \n \n \n \n \n \n Effect of Interlayer Ions on Methane Hydrate Formation in Clay Sediments.\n \n \n \n \n\n\n \n Yeon, S.; Seol, J.; Seo, Y.; Park, Y.; Koh, D.; Park, K.; Huh, D.; Lee, J.; and Lee, H.\n\n\n \n\n\n\n The Journal of Physical Chemistry B, 113(5): 1245–1248. February 2009.\n \n\n\n\n
\n\n\n\n \n \n $\"Effect$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{yeon_effect_2009,\n\ttitle = {Effect of {Interlayer} {Ions} on {Methane} {Hydrate} {Formation} in {Clay} {Sediments}},\n\tvolume = {113},\n\tissn = {1520-6106},\n\turl = {https://doi.org/10.1021/jp810079c},\n\tdoi = {10.1021/jp810079c},\n\tabstract = {Natural methane hydrates occurring in marine clay sediments exhibit heterogeneous phase behavior with high complexity, particularly in the negatively charged interlayer region. To date, the real clay interlayer effect on natural methane hydrate formation and stability remains still much unanswered, even though a few computer simulation and model studies are reported. We first examined the chemical shift difference of 27Al, 29Si, and 23Na between dry clay and clay containing intercalated methane hydrates (MH) in the interlayer. We also measured the solid-state 13C MAS NMR spectra of MH in Na-montmorillonite (MMT) and Ca-montmorillonite (MMT) to reveal abnormal methane popularity established in the course of intercalation and further performed cryo-TEM and XRD analyses to identify the morphology and layered structure of the intercalated methane hydrate. The present findings strongly suggest that the real methane amount contained in natural MH deposits should be reevaluated under consideration of the compositional, structural, and physical characteristics of clay-rich sediments. Furthermore, the intercalated methane hydrate structure should be seriously considered for developing the in situ production technologies of the deep-ocean methane hydrate.},\n\tnumber = {5},\n\turldate = {2026-01-30},\n\tjournal = {The Journal of Physical Chemistry B},\n\tpublisher = {American Chemical Society},\n\tauthor = {Yeon, Sun-Hwa and Seol, Jiwoong and Seo, Young-ju and Park, Youngjune and Koh, Dong-Yeun and Park, Keun-Pil and Huh, Dae-Gee and Lee, Jaehyoung and Lee, Huen},\n\tmonth = feb,\n\tyear = {2009},\n\tpages = {1245--1248},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Structural, Mineralogical, and Rheological Properties of Methane Hydrates in Smectite Clays.\n \n \n \n \n\n\n \n Seo, Y.; Seol, J.; Yeon, S.; Koh, D.; Cha, M.; Kang, S.; Seo, Y.; Bahk, J.; Lee, J.; and Lee, H.\n\n\n \n\n\n\n Journal of Chemical & Engineering Data, 54(4): 1284–1291. April 2009.\n \n\n\n\n
\n\n\n\n \n \n $\"Structural,$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{seo_structural_2009,\n\ttitle = {Structural, {Mineralogical}, and {Rheological} {Properties} of {Methane} {Hydrates} in {Smectite} {Clays}},\n\tvolume = {54},\n\tissn = {0021-9568},\n\turl = {https://doi.org/10.1021/je800833y},\n\tdoi = {10.1021/je800833y},\n\tabstract = {Smectite clays are widely dispersed in deep ocean sediments and can be subdivided into two representative clay types, Cheto- and Wyoming-montmorillonites. In this study, we measured the thermodynamic phase behavior of methane hydrates intercalated at various concentrations of these clays and found the relatively weak promotion tendency when compared to that of pure methane hydrate stability. The structure and morphology of intercalated methane hydrate (IMH) samples were analyzed using the MAS NMR, RAMAN, LT-XRD, and Cryo-FE-SEM. The 27Al and 29Si solid-state MAS NMR spectra of IMH Cheto and Otay clays represent that the structural stability is preserved during the IMH formation, which is also indicated with the XRD pattern showing no structural transformation but different d-spacing values due to clay−water suspension and IMH. In addition, Cryo-SEM images of IMH samples show that IMH Otay clays provide well-developed methane hydrate (MH) morphology, compared to the IMH Cheto clay.},\n\tnumber = {4},\n\turldate = {2026-01-30},\n\tjournal = {Journal of Chemical \\& Engineering Data},\n\tpublisher = {American Chemical Society},\n\tauthor = {Seo, Young-ju and Seol, Jiwoong and Yeon, Sun-Hwa and Koh, Dong-Yeun and Cha, Minjun and Kang, Sung-Pil and Seo, Yu-Taek and Bahk, Jang-jun and Lee, Jaehyoung and Lee, Huen},\n\tmonth = apr,\n\tyear = {2009},\n\tpages = {1284--1291},\n}\n\n\n\n

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\n \n\n \n \n \n \n \n \n Spectroscopic Observation of Atomic Hydrogen Radicals Entrapped in Icy Hydrogen Hydrate.\n \n \n \n \n\n\n \n Yeon, S.; Seol, J.; Park, Y.; Koh, D.; Kang, Y. S.; and Lee, H.\n\n\n \n\n\n\n Journal of the American Chemical Society, 130(29): 9208–9209. July 2008.\n \n\n\n\n
\n\n\n\n \n \n $\"Spectroscopic$ Paper\n \n \n\n \n \n doi\n \n \n\n \n link\n \n \n\n bibtex\n \n\n \n \n \n abstract \n \n\n \n\n \n \n \n \n \n \n \n\n \n \n \n\n\n\n

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@article{yeon_spectroscopic_2008,\n\ttitle = {Spectroscopic {Observation} of {Atomic} {Hydrogen} {Radicals} {Entrapped} in {Icy} {Hydrogen} {Hydrate}},\n\tvolume = {130},\n\tissn = {0002-7863},\n\turl = {https://doi.org/10.1021/ja802952p},\n\tdoi = {10.1021/ja802952p},\n\tabstract = {A hydrogen molecule entrapped in the cages of icy hydrogen hydrate is confined in host water framework and thus behaves unlike pure solid or liquid hydrogen. The γ-irradiated hydrogen radicals are for the first time observed from ESR and solid-state MAS 1H NMR spectra to stably exist in the icy hydrate channels without any collapse of the host framework, confirming the chemical shift consistency of ionized hydrogen derivatives. We discuss the confined icy hydrate channels, which can act as potential storage sites for simultaneously imprisoning both molecular and ionized hydrogen and further as icy nanoreactors.},\n\tnumber = {29},\n\turldate = {2026-01-30},\n\tjournal = {Journal of the American Chemical Society},\n\tpublisher = {American Chemical Society},\n\tauthor = {Yeon, Sun-Hwa and Seol, Jiwoong and Park, Youngjune and Koh, Dong-Yeun and Kang, Young Soo and Lee, Huen},\n\tmonth = jul,\n\tyear = {2008},\n\tpages = {9208--9209},\n}\n\n\n\n

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