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\n\n \n \n \n \n \n \n Seagrass- and wood-based cement boards: A comparative study in terms of physico-mechanical and structural properties.\n \n \n \n \n\n\n \n Mayer, A.; Kuqo, A.; Koddenberg, T.; and Mai, C.\n\n\n \n\n\n\n
Composites Part A: Applied Science and Manufacturing, 156: 106864. February 2022.\n
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@article{mayer_seagrass-_2022,\n\ttitle = {Seagrass- and wood-based cement boards: {A} comparative study in terms of physico-mechanical and structural properties},\n\tvolume = {156},\n\tissn = {1359835X},\n\tshorttitle = {Seagrass- and wood-based cement boards},\n\turl = {https://linkinghub.elsevier.com/retrieve/pii/S1359835X22000586},\n\tdoi = {10.1016/j.compositesa.2022.106864},\n\tabstract = {The inclusion and management of local, natural resources in the construction sector are on the rise as a result of the undisputed essentiality of sustainability. This study aims to assess and compare cement-bonded boards containing seagrass fibers (Posidonia oceanica) and pine wood particles (Pinus sylvestris) in terms of their compatibility with cement, their physico-mechanical properties, and their microstructure using X-ray microcomputed tomography and 3D-reflected light microscopy. Seagrass-based cement boards comply with the DIN EN 634 surpassing the stated MOR value of 9 N mm− 2. The thickness swelling of all seagrass-based cement boards was between 0.2 and 1.2\\%, indicating a possible outdoor application. The structural characterization and the study of the degree of compatibility showed that the size, geometry, and chemical composition of the lignocellulosic precursors mostly influenced the final properties of the board. Seagrass-based cement boards provide novel possibilities to use new environmentally friendly materials for construction applications.},\n\tlanguage = {en},\n\turldate = {2022-02-11},\n\tjournal = {Composites Part A: Applied Science and Manufacturing},\n\tauthor = {Mayer, Aaron and Kuqo, Aldi and Koddenberg, Tim and Mai, Carsten},\n\tmonth = feb,\n\tyear = {2022},\n\tpages = {106864},\n\tfile = {Kilian Mayer et al. - 2022 - Seagrass- and wood-based cement boards A comparat.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\TNYLXTEZ\\\\Kilian Mayer et al. - 2022 - Seagrass- and wood-based cement boards A comparat.pdf:application/pdf},\n}\n\n
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\n The inclusion and management of local, natural resources in the construction sector are on the rise as a result of the undisputed essentiality of sustainability. This study aims to assess and compare cement-bonded boards containing seagrass fibers (Posidonia oceanica) and pine wood particles (Pinus sylvestris) in terms of their compatibility with cement, their physico-mechanical properties, and their microstructure using X-ray microcomputed tomography and 3D-reflected light microscopy. Seagrass-based cement boards comply with the DIN EN 634 surpassing the stated MOR value of 9 N mm− 2. The thickness swelling of all seagrass-based cement boards was between 0.2 and 1.2%, indicating a possible outdoor application. The structural characterization and the study of the degree of compatibility showed that the size, geometry, and chemical composition of the lignocellulosic precursors mostly influenced the final properties of the board. Seagrass-based cement boards provide novel possibilities to use new environmentally friendly materials for construction applications.\n
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\n\n \n \n \n \n \n \n Non-Destructive Evaluation of the Cutting Surface of Hardwood Finger Joints.\n \n \n \n \n\n\n \n Stolze, H.; Gurnik, M.; Koddenberg, T.; Kröger, J.; Köhler, R.; Viöl, W.; and Militz, H.\n\n\n \n\n\n\n
Sensors, 22(10): 3855. January 2022.\n
Number: 10 Publisher: Multidisciplinary Digital Publishing Institute\n\n
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@article{stolze_non-destructive_2022,\n\ttitle = {Non-{Destructive} {Evaluation} of the {Cutting} {Surface} of {Hardwood} {Finger} {Joints}},\n\tvolume = {22},\n\tcopyright = {http://creativecommons.org/licenses/by/3.0/},\n\tissn = {1424-8220},\n\turl = {https://www.mdpi.com/1424-8220/22/10/3855},\n\tdoi = {10.3390/s22103855},\n\tabstract = {In this study, the surface parameters wettability, roughness, and adhesive penetration, which are important for wood bonding, were investigated and evaluated utilizing non-destructive methods after different mechanical processing. For this purpose, beech and birch finger joints were prepared with different cutting combinations (three cutters with different sharpness levels and two feed rates) in an industrial process. Effects and interactions on the surface parameters resulting from the different cutting combinations were evaluated using three Full Factorial Designs. The various cutting parameters had a predominantly significant influence on the surface parameters. The effects and identified interactions highlight the complexity of the cutting surface and the importance of wood bonding. In this respect, a new finding is that with sharper cutters, higher contact angles of the adhesives occur. The methods (contact angle measurement, laser scanning microscopy, and brightfield microscopy) used were well suited to make effects visible and quantifiable, which can be of interest for the quality control of the wood processing industry. The results can help to better understand and evaluate the design of wood surfaces via machining and the bonding of hardwoods. Possibly the results can contribute to further standardizing the production of load-bearing hardwood finger joints and making them more efficient.},\n\tlanguage = {en},\n\tnumber = {10},\n\turldate = {2022-05-19},\n\tjournal = {Sensors},\n\tauthor = {Stolze, Hannes and Gurnik, Michael and Koddenberg, Tim and Kröger, Jonas and Köhler, Robert and Viöl, Wolfgang and Militz, Holger},\n\tmonth = jan,\n\tyear = {2022},\n\tnote = {Number: 10\nPublisher: Multidisciplinary Digital Publishing Institute},\n\tkeywords = {roughness, hardwood, wettability, non-destructive evaluation, adhesive penetration, cutting surface, finger-jointing, wood characterization},\n\tpages = {3855},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\H4WWF56G\\\\Stolze et al. - 2022 - Non-Destructive Evaluation of the Cutting Surface .pdf:application/pdf;sensors-22-03855.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\J6S2BUM3\\\\sensors-22-03855.pdf:application/pdf},\n}\n\n
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\n In this study, the surface parameters wettability, roughness, and adhesive penetration, which are important for wood bonding, were investigated and evaluated utilizing non-destructive methods after different mechanical processing. For this purpose, beech and birch finger joints were prepared with different cutting combinations (three cutters with different sharpness levels and two feed rates) in an industrial process. Effects and interactions on the surface parameters resulting from the different cutting combinations were evaluated using three Full Factorial Designs. The various cutting parameters had a predominantly significant influence on the surface parameters. The effects and identified interactions highlight the complexity of the cutting surface and the importance of wood bonding. In this respect, a new finding is that with sharper cutters, higher contact angles of the adhesives occur. The methods (contact angle measurement, laser scanning microscopy, and brightfield microscopy) used were well suited to make effects visible and quantifiable, which can be of interest for the quality control of the wood processing industry. The results can help to better understand and evaluate the design of wood surfaces via machining and the bonding of hardwoods. Possibly the results can contribute to further standardizing the production of load-bearing hardwood finger joints and making them more efficient.\n
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\n\n \n \n \n \n \n \n Properties of Mexican bloodwood (Haematoxylum campechianum L.). Part 1: anatomical and colourimetric characteristics.\n \n \n \n \n\n\n \n Koddenberg, T.; Brischke, C.; Emmerich, L.; and Kick, A. B. E.\n\n\n \n\n\n\n
Holzforschung, 76(4): 330–338. April 2022.\n
Publisher: De Gruyter\n\n
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@article{koddenberg_properties_2022,\n\ttitle = {Properties of {Mexican} bloodwood ({Haematoxylum} campechianum {L}.). {Part} 1: anatomical and colourimetric characteristics},\n\tvolume = {76},\n\tissn = {1437-434X},\n\tshorttitle = {Properties of {Mexican} bloodwood ({Haematoxylum} campechianum {L}.). {Part} 1},\n\turl = {https://www.degruyter.com/document/doi/10.1515/hf-2021-0186/html},\n\tdoi = {10.1515/hf-2021-0186},\n\tabstract = {Bloodwood ( Haematoxylum campechianum L.) native to Central America has been known as dye source since the prehistoric times by the Maya. Nowadays, bloodwood is increasingly used for plantations but its use for furniture, flooring, or fencing is only of regional importance. The reason is seen in lacking knowledge of its properties. To expand that knowledge, this Part 1 of the two-part study series investigated the anatomy and the discolouration due to leaching of heartwood of H. campechianum . Anatomical characteristics were described qualitatively and quantitively using scanning electron microscopy and X-ray micro-computed tomography. Detailed wood anatomical data are presented, together with numerical analyses of cell parameters. Apart from wood anatomy, colourimetric analyses were obtained after 10 leaching cycles. The colour change of the wood due to water exposure was determined measuring in CIE L * a * b * colour system. In addition, the extinction of the leachate was determined spectrophotometrically after each leaching cycle. The resulting colour change was evaluated according to colour change after each cycle. The most prominent change in colour was observed for the first cycle due to leaching. Because of the extensive leaching of extractives, further investigation might address the effect of leaching of water-soluble extractives on adhesion properties of bloodwood.},\n\tlanguage = {en},\n\tnumber = {4},\n\turldate = {2022-05-03},\n\tjournal = {Holzforschung},\n\tauthor = {Koddenberg, Tim and Brischke, Christian and Emmerich, Lukas and Kick, Annika B. E.},\n\tmonth = apr,\n\tyear = {2022},\n\tnote = {Publisher: De Gruyter},\n\tkeywords = {leaching, anatomy, microscopy, colourimetry, dyewood},\n\tpages = {330--338},\n\tfile = {Koddenberg et al. - 2022 - Properties of Mexican bloodwood (Haematoxylum camp.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\Q5C65HWB\\\\Koddenberg et al. - 2022 - Properties of Mexican bloodwood (Haematoxylum camp.pdf:application/pdf},\n}\n\n
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\n Bloodwood ( Haematoxylum campechianum L.) native to Central America has been known as dye source since the prehistoric times by the Maya. Nowadays, bloodwood is increasingly used for plantations but its use for furniture, flooring, or fencing is only of regional importance. The reason is seen in lacking knowledge of its properties. To expand that knowledge, this Part 1 of the two-part study series investigated the anatomy and the discolouration due to leaching of heartwood of H. campechianum . Anatomical characteristics were described qualitatively and quantitively using scanning electron microscopy and X-ray micro-computed tomography. Detailed wood anatomical data are presented, together with numerical analyses of cell parameters. Apart from wood anatomy, colourimetric analyses were obtained after 10 leaching cycles. The colour change of the wood due to water exposure was determined measuring in CIE L * a * b * colour system. In addition, the extinction of the leachate was determined spectrophotometrically after each leaching cycle. The resulting colour change was evaluated according to colour change after each cycle. The most prominent change in colour was observed for the first cycle due to leaching. Because of the extensive leaching of extractives, further investigation might address the effect of leaching of water-soluble extractives on adhesion properties of bloodwood.\n
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\n\n \n \n \n \n \n \n Properties of Mexican bloodwood (Haematoxylum campechianum L.). Part 2: moisture performance and biological durability.\n \n \n \n \n\n\n \n Brischke, C.; Emmerich, L.; Koddenberg, T.; and Kick, A. E. B.\n\n\n \n\n\n\n
Holzforschung, 76(4): 339–347. April 2022.\n
Publisher: De Gruyter\n\n
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\n\n \n \n 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{brischke_properties_2022,\n\ttitle = {Properties of {Mexican} bloodwood ({Haematoxylum} campechianum {L}.). {Part} 2: moisture performance and biological durability},\n\tvolume = {76},\n\tissn = {1437-434X},\n\tshorttitle = {Properties of {Mexican} bloodwood ({Haematoxylum} campechianum {L}.). {Part} 2},\n\turl = {https://www.degruyter.com/document/doi/10.1515/hf-2021-0187/html},\n\tdoi = {10.1515/hf-2021-0187},\n\tabstract = {Haematoxylum campechianum is most prevalently used as dyewood; its use for furniture, flooring, or fencing is only of regional importance, which might be due to lacking data about its technological properties. Therefore, small specimens were cut from H. campechianum stems from plantations in the lowlands of the Usumacinta delta in Mexico. The latter were subjected to laboratory decay and moisture studies. Water vapour sorption, liquid water uptake, and swelling of H. campechianum appeared much lower in comparison with most European grown wood species and similar to tropical hardwoods such as Tectona grandis . After removal of water-soluble ingredients, water vapour sorption of H. campechianum specimens further decreased, which assigned such ingredients a somewhat hydrophilic character. Mean mass losses (ML) due to decay by white, brown, and soft rot fungi in laboratory tests were \\<5\\%. On the basis of a dose-response model, wetting ability factors and ML values from decay tests predicted an outdoor performance similar to T. grandis and Intsia bijuga . Based on this preliminary property profile, H. campechianum can be recommended for both outdoor (e.g. fencing, outdoor decking, railing) and indoor applications (e.g. flooring, manufacturing of furniture, wall and ceiling panels, decoration artwork).},\n\tlanguage = {en},\n\tnumber = {4},\n\turldate = {2022-05-03},\n\tjournal = {Holzforschung},\n\tauthor = {Brischke, Christian and Emmerich, Lukas and Koddenberg, Tim and Kick, Annika E. B.},\n\tmonth = apr,\n\tyear = {2022},\n\tnote = {Publisher: De Gruyter},\n\tkeywords = {durability class, sorption isotherm, moisture performance, dyewood, logwood},\n\tpages = {339--347},\n\tfile = {Brischke et al. - 2022 - Properties of Mexican bloodwood ( Haematoxylum .pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\A6NLMU7Z\\\\Brischke et al. - 2022 - Properties of Mexican bloodwood ( Haematoxylum .pdf:application/pdf},\n}\n\n
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\n Haematoxylum campechianum is most prevalently used as dyewood; its use for furniture, flooring, or fencing is only of regional importance, which might be due to lacking data about its technological properties. Therefore, small specimens were cut from H. campechianum stems from plantations in the lowlands of the Usumacinta delta in Mexico. The latter were subjected to laboratory decay and moisture studies. Water vapour sorption, liquid water uptake, and swelling of H. campechianum appeared much lower in comparison with most European grown wood species and similar to tropical hardwoods such as Tectona grandis . After removal of water-soluble ingredients, water vapour sorption of H. campechianum specimens further decreased, which assigned such ingredients a somewhat hydrophilic character. Mean mass losses (ML) due to decay by white, brown, and soft rot fungi in laboratory tests were <5%. On the basis of a dose-response model, wetting ability factors and ML values from decay tests predicted an outdoor performance similar to T. grandis and Intsia bijuga . Based on this preliminary property profile, H. campechianum can be recommended for both outdoor (e.g. fencing, outdoor decking, railing) and indoor applications (e.g. flooring, manufacturing of furniture, wall and ceiling panels, decoration artwork).\n
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\n\n \n \n \n \n \n \n Biomimetic confined self-assembly of chitin nanocrystals.\n \n \n \n \n\n\n \n Liu, P.; Wang, J.; Qi, H.; Koddenberg, T.; Xu, D.; Liu, S.; and Zhang, K.\n\n\n \n\n\n\n
Nano Today, 43: 101420. April 2022.\n
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@article{liu_biomimetic_2022,\n\ttitle = {Biomimetic confined self-assembly of chitin nanocrystals},\n\tvolume = {43},\n\tissn = {17480132},\n\turl = {https://linkinghub.elsevier.com/retrieve/pii/S1748013222000470},\n\tdoi = {10.1016/j.nantod.2022.101420},\n\tabstract = {It is a longstanding challenge to aptly describe the natural assembly process of chitin Bouligand organi zation as well as biomimetic construct these position-dependent structures with the isolated chitin na nodomains. Here, we report a fixed-boundary evaporation-induced self-assembly (FB-EISA) modality using chitin nanocrystals (ChNCs) in the capillaries, where the generation of continuous and ordered anisotropic phase relies on the growth of phase boundary towards the opposite direction of water evaporation. Distinct from the previous EISA modalities with the moving evaporation interface, the pinned air-liquid interface at the end of capillaries in a confined environment acts as the evaporation interface and initial deposition site of ChNCs simultaneously. During the whole self-assembly process via successive evaporation, the genera tion of droplets-like ChNCs clusters known as tactoids is suppressed. Therefore, continuous birefringent multi-layers as nested multiple paraboloid structures of ChNCs with a density gradient are gradually generated, before cylindrical tubes are formed finally. The FB-EISA process can be accelerated by heat and maintains stable regardless of vibration or different capillary opening directions relative to gravity direc tion. This FB-EISA modality in confined geometry allows rapid formation of ChNCs-based photonics-quality structure of larger length scales and enables us to deepen our understanding of the natural self-assembly process in diverse biological species.},\n\tlanguage = {en},\n\turldate = {2022-02-02},\n\tjournal = {Nano Today},\n\tauthor = {Liu, Peiwen and Wang, Jiaxiu and Qi, Houjuan and Koddenberg, Tim and Xu, Dan and Liu, Siyuan and Zhang, Kai},\n\tmonth = apr,\n\tyear = {2022},\n\tpages = {101420},\n\tfile = {Liu et al. - 2022 - Biomimetic confined self-assembly of chitin nanocr.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\VRXG2QVP\\\\Liu et al. - 2022 - Biomimetic confined self-assembly of chitin nanocr.pdf:application/pdf},\n}\n\n
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\n It is a longstanding challenge to aptly describe the natural assembly process of chitin Bouligand organi zation as well as biomimetic construct these position-dependent structures with the isolated chitin na nodomains. Here, we report a fixed-boundary evaporation-induced self-assembly (FB-EISA) modality using chitin nanocrystals (ChNCs) in the capillaries, where the generation of continuous and ordered anisotropic phase relies on the growth of phase boundary towards the opposite direction of water evaporation. Distinct from the previous EISA modalities with the moving evaporation interface, the pinned air-liquid interface at the end of capillaries in a confined environment acts as the evaporation interface and initial deposition site of ChNCs simultaneously. During the whole self-assembly process via successive evaporation, the genera tion of droplets-like ChNCs clusters known as tactoids is suppressed. Therefore, continuous birefringent multi-layers as nested multiple paraboloid structures of ChNCs with a density gradient are gradually generated, before cylindrical tubes are formed finally. The FB-EISA process can be accelerated by heat and maintains stable regardless of vibration or different capillary opening directions relative to gravity direc tion. This FB-EISA modality in confined geometry allows rapid formation of ChNCs-based photonics-quality structure of larger length scales and enables us to deepen our understanding of the natural self-assembly process in diverse biological species.\n
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\n\n \n \n \n \n \n Structural characterisation of the variable impregnation of poplar wood.\n \n \n \n\n\n \n Buschalsky, A.; Löning, S.; Militz, H.; and Koddenberg, T.\n\n\n \n\n\n\n In
Hardwood Conference Proceedings, pages 28–36, Sopron, Hungary, 2022. University of Sopron Press\n
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@inproceedings{buschalsky_structural_2022,\n\taddress = {Sopron, Hungary},\n\ttitle = {Structural characterisation of the variable impregnation of poplar wood},\n\tisbn = {978-963-334-446-0},\n\tlanguage = {EN},\n\tbooktitle = {Hardwood {Conference} {Proceedings}},\n\tpublisher = {University of Sopron Press},\n\tauthor = {Buschalsky, Andreas and Löning, Sophie and Militz, Holger and Koddenberg, Tim},\n\tyear = {2022},\n\tpages = {28--36},\n}\n\n
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