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\n\n \n \n \n \n \n \n Vacuum Low-Temperature Microwave-Assisted Pyrolysis of Technical Lignins.\n \n \n \n \n\n\n \n Karthäuser, J.; Biziks, V.; Frauendorf, H.; Mai, C.; and Militz, H.\n\n\n \n\n\n\n
Polymers, 14(16): 3383. August 2022.\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 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{karthauser_vacuum_2022,\n\ttitle = {Vacuum {Low}-{Temperature} {Microwave}-{Assisted} {Pyrolysis} of {Technical} {Lignins}},\n\tvolume = {14},\n\tissn = {2073-4360},\n\turl = {https://www.mdpi.com/2073-4360/14/16/3383},\n\tdoi = {10.3390/polym14163383},\n\tabstract = {Cleavage by microwave-assisted pyrolysis is a way to obtain higher-value organic chemicals from technical lignins. In this report, pine kraft lignin (PKL), spruce and beech organosolv lignin (SOSL and BOSL), and calcium lignosulfonates from spruce wood (LS) were pyrolyzed at temperatures between 30 and 280 ◦C using vacuum low-temperature, microwave-assisted pyrolysis. The mass balance, energy consumption, condensation rate, and pressure changes of the products during the pyrolysis process were recorded. Phenolic condensates obtained at different temperatures during pyrolysis were collected, and their chemical composition was determined by GC-MS and GC-FID. The origin of the technical lignin had a significant influence on the pyrolysis products. Phenolic condensates were obtained in yields of approximately 15\\% (PKL and SOSL) as well as in lower yields of 4.5\\% (BOSL) or even 1.7\\% (LS). The main production of the phenolic condensates for the PKL and SOSL occurred at temperatures of approximately 140 and 180 ◦C, respectively. The main components of the phenolic fraction of the three softwood lignins were guaiacol, 4-methylguaiacol, 4-ethylguaiacol, and other guaiacol derivatives; however, the quantity varied significantly depending on the lignin source. Due to the low cleavage temperature vacuum, low-temperature, microwave-assisted pyrolysis could be an interesting approach to lignin conversion.},\n\tlanguage = {en},\n\tnumber = {16},\n\turldate = {2022-08-24},\n\tjournal = {Polymers},\n\tauthor = {Karthäuser, Johannes and Biziks, Vladimirs and Frauendorf, Holm and Mai, Carsten and Militz, Holger},\n\tmonth = aug,\n\tyear = {2022},\n\tpages = {3383},\n\tfile = {Karthäuser et al. - 2022 - Vacuum Low-Temperature Microwave-Assisted Pyrolysi.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\SKUKYR79\\\\Karthäuser et al. - 2022 - Vacuum Low-Temperature Microwave-Assisted Pyrolysi.pdf:application/pdf},\n}\n\n
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\n Cleavage by microwave-assisted pyrolysis is a way to obtain higher-value organic chemicals from technical lignins. In this report, pine kraft lignin (PKL), spruce and beech organosolv lignin (SOSL and BOSL), and calcium lignosulfonates from spruce wood (LS) were pyrolyzed at temperatures between 30 and 280 ◦C using vacuum low-temperature, microwave-assisted pyrolysis. The mass balance, energy consumption, condensation rate, and pressure changes of the products during the pyrolysis process were recorded. Phenolic condensates obtained at different temperatures during pyrolysis were collected, and their chemical composition was determined by GC-MS and GC-FID. The origin of the technical lignin had a significant influence on the pyrolysis products. Phenolic condensates were obtained in yields of approximately 15% (PKL and SOSL) as well as in lower yields of 4.5% (BOSL) or even 1.7% (LS). The main production of the phenolic condensates for the PKL and SOSL occurred at temperatures of approximately 140 and 180 ◦C, respectively. The main components of the phenolic fraction of the three softwood lignins were guaiacol, 4-methylguaiacol, 4-ethylguaiacol, and other guaiacol derivatives; however, the quantity varied significantly depending on the lignin source. Due to the low cleavage temperature vacuum, low-temperature, microwave-assisted pyrolysis could be an interesting approach to lignin conversion.\n
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\n\n \n \n \n \n \n \n Compression of Acetylated Beech (Fagus sylvatica L.) Laminated Veneer Lumber (LVL).\n \n \n \n \n\n\n \n Slabohm, M.; Mayer, A. K.; and Militz, H.\n\n\n \n\n\n\n
Forests, 13(7): 1122. July 2022.\n
Number: 7 Publisher: Multidisciplinary Digital Publishing Institute\n\n
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@article{slabohm_compression_2022,\n\ttitle = {Compression of {Acetylated} {Beech} ({Fagus} sylvatica {L}.) {Laminated} {Veneer} {Lumber} ({LVL})},\n\tvolume = {13},\n\tcopyright = {http://creativecommons.org/licenses/by/3.0/},\n\tissn = {1999-4907},\n\turl = {https://www.mdpi.com/1999-4907/13/7/1122},\n\tdoi = {10.3390/f13071122},\n\tabstract = {Acetylation with acetic anhydride is well known to improve the dimensional stability and durability of wood. Veneer is appealing for acetylation because of its thin thickness, which supports a complete and even impregnation of difficult-to-treat wood species, such as beech (Fagus sylvatica L.). Unlike resin-based veneer impregnation, acetylated veneer does not require any additional curing. As a result, veneer properties are already altered prior to bonding. The compression thickness reduction in acetylated beech veneer during the manufacturing of laminated veneer lumber (LVL) utilizing 1, 3, and 6 MPa at 150 °C for 30 min is investigated in this study. The results show that acetylated beech veneer is considerably less compressible than the references. Moreover, the density of acetylated LVL at low pressure (1 MPa) is similar to the one of references, even though the compressibility is much lower. This is due to the added acetyl groups after acetylation. The reduction in compressibility is most likely caused due to a decrease in moisture content (MC) and its accompanied mechanisms.},\n\tlanguage = {en},\n\tnumber = {7},\n\turldate = {2022-07-28},\n\tjournal = {Forests},\n\tauthor = {Slabohm, Maik and Mayer, Aaron Kilian and Militz, Holger},\n\tmonth = jul,\n\tyear = {2022},\n\tnote = {Number: 7\nPublisher: Multidisciplinary Digital Publishing Institute},\n\tkeywords = {wood modification, acetylation, laminated veneer lumber (LVL), compression, densification},\n\tpages = {1122},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\AJVULWFJ\\\\Slabohm et al. - 2022 - Compression of Acetylated Beech (Fagus sylvatica L.pdf:application/pdf},\n}\n\n
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\n Acetylation with acetic anhydride is well known to improve the dimensional stability and durability of wood. Veneer is appealing for acetylation because of its thin thickness, which supports a complete and even impregnation of difficult-to-treat wood species, such as beech (Fagus sylvatica L.). Unlike resin-based veneer impregnation, acetylated veneer does not require any additional curing. As a result, veneer properties are already altered prior to bonding. The compression thickness reduction in acetylated beech veneer during the manufacturing of laminated veneer lumber (LVL) utilizing 1, 3, and 6 MPa at 150 °C for 30 min is investigated in this study. The results show that acetylated beech veneer is considerably less compressible than the references. Moreover, the density of acetylated LVL at low pressure (1 MPa) is similar to the one of references, even though the compressibility is much lower. This is due to the added acetyl groups after acetylation. The reduction in compressibility is most likely caused due to a decrease in moisture content (MC) and its accompanied mechanisms.\n
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\n\n \n \n \n \n \n Proceedings of the 10th European Conference on Wood Modification.\n \n \n \n\n\n \n Candelier, K.; Collet, K.; Dumarçay, S.; Fredon, E.; Gérardin, C.; Gérardin, P.; Masson, E.; Militz, H.; Montibus, M.; Thévenon, M.; and Wozniak, E.\n\n\n \n\n\n\n University of Lorraine, Nancy, France, 2022.\n
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@book{candelier_proceedings_2022,\n\taddress = {Nancy, France},\n\ttitle = {Proceedings of the 10th {European} {Conference} on {Wood} {Modification}},\n\tisbn = {978-2-37111-000-7},\n\tlanguage = {en},\n\tpublisher = {University of Lorraine},\n\tauthor = {Candelier, K. and Collet, K. and Dumarçay, S. and Fredon, E. and Gérardin, C. and Gérardin, P. and Masson, E. and Militz, H. and Montibus, M. and Thévenon, M.-F. and Wozniak, E.},\n\tyear = {2022},\n\tfile = {ECWM10_Book of Proceedings_09062022_VF.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\ERPS3G4X\\\\ECWM10_Book of Proceedings_09062022_VF.pdf:application/pdf;ECWM10_Book of Proceedings_KC_VF_09062022.docx:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\J8AN7VQH\\\\ECWM10_Book of Proceedings_KC_VF_09062022.docx:application/vnd.openxmlformats-officedocument.wordprocessingml.document},\n}\n\n
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\n\n \n \n \n \n \n Impact of Process Duration on Selected Physical Properties of Thermally Modified Eucalyptus Wood.\n \n \n \n\n\n \n Batista, D.; Wentzel, M.; Brischke, C.; and Militz, H.\n\n\n \n\n\n\n In
Proceedings of 10th European Conference on Wood Modification, pages 365–368, Nancy, France, April 2022. University of Lorraine\n
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@inproceedings{batista_impact_2022,\n\taddress = {Nancy, France},\n\ttitle = {Impact of {Process} {Duration} on {Selected} {Physical} {Properties} of {Thermally} {Modified} {Eucalyptus} {Wood}},\n\tisbn = {978-2-37111-000-7},\n\tlanguage = {EN},\n\tbooktitle = {Proceedings of 10th {European} {Conference} on {Wood} {Modification}},\n\tpublisher = {University of Lorraine},\n\tauthor = {Batista, D.C. and Wentzel, M. and Brischke, C. and Militz, H.},\n\tmonth = apr,\n\tyear = {2022},\n\tpages = {365--368},\n}\n\n
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\n\n \n \n \n \n \n Growth Behaviour and Wood Degradation of Wood-Destroying Fungi in Chemically Modified Wood.\n \n \n \n\n\n \n Emmerich, L.; Bleckmann, M.; Strohbusch, S.; Brischke, C.; Bollmus, S.; and Militz, H.\n\n\n \n\n\n\n In
Proceedings of 10th European Conference on Wood Modification, pages 249–256, Nancy, France, April 2022. University of Lorraine\n
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@inproceedings{emmerich_growth_2022,\n\taddress = {Nancy, France},\n\ttitle = {Growth {Behaviour} and {Wood} {Degradation} of {Wood}-{Destroying} {Fungi} in {Chemically} {Modified} {Wood}},\n\tisbn = {978-2-37111-000-7},\n\tlanguage = {EN},\n\tbooktitle = {Proceedings of 10th {European} {Conference} on {Wood} {Modification}},\n\tpublisher = {University of Lorraine},\n\tauthor = {Emmerich, L. and Bleckmann, M. and Strohbusch, S. and Brischke, C. and Bollmus, S. and Militz, H.},\n\tmonth = apr,\n\tyear = {2022},\n\tpages = {249--256},\n}\n\n
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\n\n \n \n \n \n \n Wood Modification with Citric Acid and Sorbitol – A Review and Future Perspectives.\n \n \n \n\n\n \n Kurkowiak, K.; Emmerich, L.; Simmering, C.; and Militz, H.\n\n\n \n\n\n\n In
Proceedings of 10th European Conference on Wood Modification, pages 32–38, Nancy, France, April 2022. University of Lorraine\n
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@inproceedings{kurkowiak_wood_2022,\n\taddress = {Nancy, France},\n\ttitle = {Wood {Modification} with {Citric} {Acid} and {Sorbitol} – {A} {Review} and {Future} {Perspectives}},\n\tisbn = {978-2-37111-000-7},\n\tlanguage = {EN},\n\tbooktitle = {Proceedings of 10th {European} {Conference} on {Wood} {Modification}},\n\tpublisher = {University of Lorraine},\n\tauthor = {Kurkowiak, K. and Emmerich, L. and Simmering, C. and Militz, H.},\n\tmonth = apr,\n\tyear = {2022},\n\tpages = {32--38},\n}\n\n
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\n\n \n \n \n \n \n Understanding the Mode of Action of Sorbitol and Citric Acid (SorCA) in Wood.\n \n \n \n\n\n \n Kurkowiak, K.; Hentges, D.; Dumarçay, S.; Gérardin, P.; and Militz, H.\n\n\n \n\n\n\n In
Proceedings of 10th European Conference on Wood Modification, pages 209–216, Nancy, France, April 2022. University of Lorraine\n
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@inproceedings{kurkowiak_understanding_2022,\n\taddress = {Nancy, France},\n\ttitle = {Understanding the {Mode} of {Action} of {Sorbitol} and {Citric} {Acid} ({SorCA}) in {Wood}},\n\tisbn = {978-2-37111-000-7},\n\tlanguage = {EN},\n\tbooktitle = {Proceedings of 10th {European} {Conference} on {Wood} {Modification}},\n\tpublisher = {University of Lorraine},\n\tauthor = {Kurkowiak, K. and Hentges, D. and Dumarçay, S. and Gérardin, P. and Militz, H.},\n\tmonth = apr,\n\tyear = {2022},\n\tpages = {209--216},\n}\n\n
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\n\n \n \n \n \n \n Improvement of Decay and Termite's Durability of Wood Through Combined Treatments Involving Thermal and Mild Chemical Modifications – A Review of Last Research Works of Laboratory.\n \n \n \n\n\n \n Mubarok, M.; Salman, S.; Militz, H.; Dumarcay, S.; Thévenon, M.; Candelier, K.; Darmawan, I.; Hadi, Y.; and Gérardin, P.\n\n\n \n\n\n\n In
Proceedings of 10th European Conference on Wood Modification, pages 168–175, Nancy, France, April 2022. University of Lorraine\n
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@inproceedings{mubarok_improvement_2022,\n\taddress = {Nancy, France},\n\ttitle = {Improvement of {Decay} and {Termite}'s {Durability} of {Wood} {Through} {Combined} {Treatments} {Involving} {Thermal} and {Mild} {Chemical} {Modifications} – {A} {Review} of {Last} {Research} {Works} of {Laboratory}},\n\tisbn = {978-2-37111-000-7},\n\tlanguage = {EN},\n\tbooktitle = {Proceedings of 10th {European} {Conference} on {Wood} {Modification}},\n\tpublisher = {University of Lorraine},\n\tauthor = {Mubarok, M. and Salman, S. and Militz, H. and Dumarcay, S. and Thévenon, M.F. and Candelier, K. and Darmawan, I.W. and Hadi, Y.S. and Gérardin, P.},\n\tmonth = apr,\n\tyear = {2022},\n\tpages = {168--175},\n}\n\n
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\n\n \n \n \n \n \n Improving Durability and Dimensional Stability of Beech (Fagus sylvatica L.) LVL by Acetylation With Acetic Anhydride.\n \n \n \n\n\n \n Slabohm, M.; and Militz, H.\n\n\n \n\n\n\n In
Proceedings of 10th European Conference on Wood Modification, pages 217–225, Nancy, France, April 2022. University of Lorraine\n
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@inproceedings{slabohm_improving_2022,\n\taddress = {Nancy, France},\n\ttitle = {Improving {Durability} and {Dimensional} {Stability} of {Beech} ({Fagus} sylvatica {L}.) {LVL} by {Acetylation} {With} {Acetic} {Anhydride}},\n\tisbn = {978-2-37111-000-7},\n\tlanguage = {EN},\n\tbooktitle = {Proceedings of 10th {European} {Conference} on {Wood} {Modification}},\n\tpublisher = {University of Lorraine},\n\tauthor = {Slabohm, M. and Militz, H.},\n\tmonth = apr,\n\tyear = {2022},\n\tpages = {217--225},\n}\n\n
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\n\n \n \n \n \n \n \n Bonding Acetylated Veneer for Engineered Wood Products—A Review.\n \n \n \n \n\n\n \n Slabohm, M.; Mai, C.; and Militz, H.\n\n\n \n\n\n\n
Materials, 15(10): 3665. May 2022.\n
Number: 10 Publisher: Multidisciplinary Digital Publishing Institute\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{slabohm_bonding_2022,\n\ttitle = {Bonding {Acetylated} {Veneer} for {Engineered} {Wood} {Products}—{A} {Review}},\n\tvolume = {15},\n\tcopyright = {http://creativecommons.org/licenses/by/3.0/},\n\tissn = {1996-1944},\n\turl = {https://www.mdpi.com/1996-1944/15/10/3665},\n\tdoi = {10.3390/ma15103665},\n\tabstract = {The purpose of this review is to put previous research findings on acetylated wood and the fabrication of veneer-based products in a common context. The first research on wood acetylation was already conducted in the 1920s using wood meal, whereas relevant research on veneer acetylation was published nearly two decades later, during the 1940s. In the years that followed, a great deal of research has been done on both solid wood and composite acetylation. Developments in the 1990s and early 2000s resulted in the creation of commercial products. Nowadays, wood is becoming increasingly popular in construction. Therefore, high-performance materials with high dimensional stability and durability are required. Veneers are thereby of particular relevance because of their propensity to absorb chemicals into even tough-to-treat wood species. However, acetylation alters the bonding properties of wood, which is important for the manufacture of engineered veneer products, especially in load-bearing construction. A large amount of research is now being conducted on the acetylation of veneer, and acetylated veneer products are anticipated in the near future. This study covers the fundamentals of bonding but focuses specifically on veneer acetylation and its fabrication to engineered veneer-based products. The influencing factors of acetylation on bonding are also discussed.},\n\tlanguage = {en},\n\tnumber = {10},\n\turldate = {2022-05-23},\n\tjournal = {Materials},\n\tauthor = {Slabohm, Maik and Mai, Carsten and Militz, Holger},\n\tmonth = may,\n\tyear = {2022},\n\tnote = {Number: 10\nPublisher: Multidisciplinary Digital Publishing Institute},\n\tkeywords = {wood modification, plywood, acetylation, laminated veneer lumber, rotary cut veneer},\n\tpages = {3665},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\C75YXPUX\\\\Slabohm et al. - 2022 - Bonding Acetylated Veneer for Engineered Wood Prod.pdf:application/pdf},\n}\n\n
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\n The purpose of this review is to put previous research findings on acetylated wood and the fabrication of veneer-based products in a common context. The first research on wood acetylation was already conducted in the 1920s using wood meal, whereas relevant research on veneer acetylation was published nearly two decades later, during the 1940s. In the years that followed, a great deal of research has been done on both solid wood and composite acetylation. Developments in the 1990s and early 2000s resulted in the creation of commercial products. Nowadays, wood is becoming increasingly popular in construction. Therefore, high-performance materials with high dimensional stability and durability are required. Veneers are thereby of particular relevance because of their propensity to absorb chemicals into even tough-to-treat wood species. However, acetylation alters the bonding properties of wood, which is important for the manufacture of engineered veneer products, especially in load-bearing construction. A large amount of research is now being conducted on the acetylation of veneer, and acetylated veneer products are anticipated in the near future. This study covers the fundamentals of bonding but focuses specifically on veneer acetylation and its fabrication to engineered veneer-based products. The influencing factors of acetylation on bonding are also discussed.\n
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\n\n \n \n \n \n \n Identifikation und Anwendung kurzkettiger Lignin-Bausteine zur Holzmodifizierung.\n \n \n \n\n\n \n Karthäuser, J.; Biziks, V.; Hoffmann, L.; Frauendorf, H.; and Militz, H.\n\n\n \n\n\n\n In
Deutsche Holzschutztagung 2022, pages 140–147, Dresden, May 2022. IHD\n
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@inproceedings{karthauser_identifikation_2022,\n\taddress = {Dresden},\n\ttitle = {Identifikation und {Anwendung} kurzkettiger {Lignin}-{Bausteine} zur {Holzmodifizierung}},\n\tlanguage = {de},\n\tbooktitle = {Deutsche {Holzschutztagung} 2022},\n\tpublisher = {IHD},\n\tauthor = {Karthäuser, Johannes and Biziks, Vladimirs and Hoffmann, Lisa and Frauendorf, Holm and Militz, Holger},\n\tmonth = may,\n\tyear = {2022},\n\tpages = {140--147},\n}\n\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 Wood durability in terrestrial and aquatic environments – A review of biotic and abiotic influence factors.\n \n \n \n \n\n\n \n Marais, B. N.; Brischke, C.; and Militz, H.\n\n\n \n\n\n\n
Wood Material Science & Engineering, 17(2): 82–105. 2022.\n
Publisher: Taylor & Francis _eprint: https://doi.org/10.1080/17480272.2020.1779810\n\n
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@article{marais_wood_2022,\n\ttitle = {Wood durability in terrestrial and aquatic environments – {A} review of biotic and abiotic influence factors},\n\tvolume = {17},\n\tissn = {1748-0272},\n\turl = {https://doi.org/10.1080/17480272.2020.1779810},\n\tdoi = {10.1080/17480272.2020.1779810},\n\tabstract = {Factors relevant to degradation are important in every wood application. For wood used in ground and water contact; well documented abiotic factors (or agents) include exposure to temperature and moisture linked to the physiological requirements of biotic degradation agents such as wood-decaying fungi and bacteria. Other biotic degradation agents such as subterranean insects and marine borers occur overshadowing the effect of fungal and bacterial decay, but are restricted in geographical distribution and to aquatic applications, respectively. This review focusses on decay specific to soil exposure. The inherent material characteristics are important to durability in that heartwood and sapwood show differences in resistance to degradation between species, provenance, and individual trees. Wood durability testing methods and classification, as well as a summary of prominent models and variables suitable for regional-level modelling of in-ground wood durability are presented.},\n\tnumber = {2},\n\turldate = {2022-03-17},\n\tjournal = {Wood Material Science \\& Engineering},\n\tauthor = {Marais, Brendan Nicholas and Brischke, Christian and Militz, Holger},\n\tyear = {2022},\n\tnote = {Publisher: Taylor \\& Francis\n\\_eprint: https://doi.org/10.1080/17480272.2020.1779810},\n\tkeywords = {fungi, bacteria, marine environment, soil contact, Decay, freshwater contact},\n\tpages = {82--105},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\IL39GT2D\\\\Marais et al. - 2022 - Wood durability in terrestrial and aquatic environ.pdf:application/pdf},\n}\n\n
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\n Factors relevant to degradation are important in every wood application. For wood used in ground and water contact; well documented abiotic factors (or agents) include exposure to temperature and moisture linked to the physiological requirements of biotic degradation agents such as wood-decaying fungi and bacteria. Other biotic degradation agents such as subterranean insects and marine borers occur overshadowing the effect of fungal and bacterial decay, but are restricted in geographical distribution and to aquatic applications, respectively. This review focusses on decay specific to soil exposure. The inherent material characteristics are important to durability in that heartwood and sapwood show differences in resistance to degradation between species, provenance, and individual trees. Wood durability testing methods and classification, as well as a summary of prominent models and variables suitable for regional-level modelling of in-ground wood durability are presented.\n
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\n\n \n \n \n \n \n Incising and Double Impregnation of Beech Sleepers—Investigation of an Alternative Preservation System for Wooden Railway Sleepers.\n \n \n \n\n\n \n Starck, M.; Heidel, A.; Brischke, C.; and Militz, H.\n\n\n \n\n\n\n
Frontiers in Forests and Global Change, 5: 814049. 2022.\n
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@article{starck_incising_2022,\n\ttitle = {Incising and {Double} {Impregnation} of {Beech} {Sleepers}—{Investigation} of an {Alternative} {Preservation} {System} for {Wooden} {Railway} {Sleepers}},\n\tvolume = {5},\n\tdoi = {10.3389/ffgc.2022.814049},\n\tlanguage = {en},\n\tjournal = {Frontiers in Forests and Global Change},\n\tauthor = {Starck, Michael and Heidel, Andreas and Brischke, Christian and Militz, Holger},\n\tyear = {2022},\n\tpages = {814049},\n\tfile = {Brischke - 2022 - Incising and Double Impregnation of Beech Sleepers.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\6EXSS7WB\\\\Brischke - 2022 - Incising and Double Impregnation of Beech Sleepers.pdf:application/pdf},\n}\n\n
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\n\n \n \n \n \n \n \n Mapping the biotic degradation hazard of wood in Europe – biophysical background, engineering applications, and climate change-induced prospects.\n \n \n \n \n\n\n \n van Niekerk, P. B.; Marais, B. N.; Brischke, C.; Borges, L. M.; Kutnik, M.; Niklewski, J.; Ansard, D.; Humar, M.; Cragg, S. M.; and Militz, H.\n\n\n \n\n\n\n
Holzforschung, 76(2): 188–210. February 2022.\n
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@article{van_niekerk_mapping_2022,\n\ttitle = {Mapping the biotic degradation hazard of wood in {Europe} – biophysical background, engineering applications, and climate change-induced prospects},\n\tvolume = {76},\n\tissn = {0018-3830, 1437-434X},\n\turl = {https://www.degruyter.com/document/doi/10.1515/hf-2021-0169/html},\n\tdoi = {10.1515/hf-2021-0169},\n\tabstract = {Abstract\n \n Construction using timber has seen a resurgence in light of global climate mitigation policies. Wood is a renewable resource, and engineered wood products are proving to be competitive against concrete and steel while having several advantages. However, while the renewable nature of wood in construction is a beneficial property for climate mitigation policies, the process of biodegradation introduces a challenge for service life planning. A review of hazard mapping is presented while developing contemporary hazard maps, occurrence maps and projected hazard maps for 2050 using representative concentration pathways (\n RCP\n ) 2.6 and 8.5. The risk of timber decay is expected to increase in most of Europe as the temperatures rise, with a decrease expected in dryer regions. Termites are likely to experience a range expansion as more areas become suitable, while human activity and an increase in extreme weather events like floods are expected to facilitate dispersion. Marine borer species already present a risk in most European coastal regions; however, the effect of changes in water temperatures are likely to shift the boundaries for individual borer species. Overall, warmer climates are expected to increase the metabolic activity of all of these organisms leading to a general reduction in service life.},\n\tlanguage = {en},\n\tnumber = {2},\n\turldate = {2022-02-09},\n\tjournal = {Holzforschung},\n\tauthor = {van Niekerk, Philip B. and Marais, Brendan N. and Brischke, Christian and Borges, Luisa M.S. and Kutnik, Magdalena and Niklewski, Jonas and Ansard, David and Humar, Miha and Cragg, Simon M. and Militz, Holger},\n\tmonth = feb,\n\tyear = {2022},\n\tkeywords = {fungi, termites, marine borers, service life prediction, decay risk, exposure model},\n\tpages = {188--210},\n\tfile = {van Niekerk et al. - 2021 - Mapping the biotic degradation hazard of wood in E.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\SLNQ2G7F\\\\van Niekerk et al. - 2021 - Mapping the biotic degradation hazard of wood in E.pdf:application/pdf},\n}\n\n
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\n Abstract Construction using timber has seen a resurgence in light of global climate mitigation policies. Wood is a renewable resource, and engineered wood products are proving to be competitive against concrete and steel while having several advantages. However, while the renewable nature of wood in construction is a beneficial property for climate mitigation policies, the process of biodegradation introduces a challenge for service life planning. A review of hazard mapping is presented while developing contemporary hazard maps, occurrence maps and projected hazard maps for 2050 using representative concentration pathways ( RCP ) 2.6 and 8.5. The risk of timber decay is expected to increase in most of Europe as the temperatures rise, with a decrease expected in dryer regions. Termites are likely to experience a range expansion as more areas become suitable, while human activity and an increase in extreme weather events like floods are expected to facilitate dispersion. Marine borer species already present a risk in most European coastal regions; however, the effect of changes in water temperatures are likely to shift the boundaries for individual borer species. Overall, warmer climates are expected to increase the metabolic activity of all of these organisms leading to a general reduction in service life.\n
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\n\n \n \n \n \n \n \n Investigations of the Chemical Distribution in Sorbitol and Citric Acid (SorCA) Treated Wood—Development of a Quality Control Method on the Basis of Electromagnetic Radiation.\n \n \n \n \n\n\n \n Kurkowiak, K.; Mayer, A. K.; Emmerich, L.; and Militz, H.\n\n\n \n\n\n\n
Forests, 13(2): 151. February 2022.\n
Number: 2 Publisher: Multidisciplinary Digital Publishing Institute\n\n
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@article{kurkowiak_investigations_2022,\n\ttitle = {Investigations of the {Chemical} {Distribution} in {Sorbitol} and {Citric} {Acid} ({SorCA}) {Treated} {Wood}\\—{Development} of a {Quality} {Control} {Method} on the {Basis} of {Electromagnetic} {Radiation}},\n\tvolume = {13},\n\tcopyright = {http://creativecommons.org/licenses/by/3.0/},\n\turl = {https://www.mdpi.com/1999-4907/13/2/151},\n\tdoi = {10.3390/f13020151},\n\tabstract = {Recent studies showed treatments with sorbitol and citric acid (SorCA) to significantly improve the dimensional stability and biological durability of wood. The industrialization of this process requires a quality control (QC) method to determine if the fixated chemicals are homogenously distributed within the piece of wood, which is essential for uniform material performance. Therefore, the objective of this work was to evaluate the use of common electromagnetic radiation-based methods to determine the degree of modification in SorCA-treated wood. Both Fourier transform infrared (FTIR) spectroscopy and near-infrared (NIR) spectroscopy have been used to create rough calibrations for the weight percent gain (WPG) prediction models. The FTIR measurements resulted in a high linear correlation between the band area ratio (BAR) and the WPG (R2 = 0.93). Additionally, a partial least square (PLS) regression of NIR spectroscopic data resulted in a model with a high prediction power (R2 = 0.83). Furthermore, X-ray density profiling emerged as a simple alternative for the QC by showing a gradient of modification chemicals inside the sample and differences in chemical uptake between earlywood and latewood. Overall, it can be concluded that the results from FTIR, NIR and X-ray densitometry can serve as indicators of impregnation chemical distribution in SorCA-modified wood.},\n\tlanguage = {en},\n\tnumber = {2},\n\turldate = {2022-01-20},\n\tjournal = {Forests},\n\tauthor = {Kurkowiak, Katarzyna and Mayer, Aaron K. and Emmerich, Lukas and Militz, Holger},\n\tmonth = feb,\n\tyear = {2022},\n\tnote = {Number: 2\nPublisher: Multidisciplinary Digital Publishing Institute},\n\tkeywords = {wood modification, citric acid, sorbitol, fourier transform infrared (FTIR) spectroscopy, near-infrared (NIR) spectroscopy, quality control (QC), X-ray density profiling},\n\tpages = {151},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\DMNTP78G\\\\Kurkowiak et al. - 2022 - Investigations of the Chemical Distribution in Sor.pdf:application/pdf},\n}\n\n
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\n Recent studies showed treatments with sorbitol and citric acid (SorCA) to significantly improve the dimensional stability and biological durability of wood. The industrialization of this process requires a quality control (QC) method to determine if the fixated chemicals are homogenously distributed within the piece of wood, which is essential for uniform material performance. Therefore, the objective of this work was to evaluate the use of common electromagnetic radiation-based methods to determine the degree of modification in SorCA-treated wood. Both Fourier transform infrared (FTIR) spectroscopy and near-infrared (NIR) spectroscopy have been used to create rough calibrations for the weight percent gain (WPG) prediction models. The FTIR measurements resulted in a high linear correlation between the band area ratio (BAR) and the WPG (R2 = 0.93). Additionally, a partial least square (PLS) regression of NIR spectroscopic data resulted in a model with a high prediction power (R2 = 0.83). Furthermore, X-ray density profiling emerged as a simple alternative for the QC by showing a gradient of modification chemicals inside the sample and differences in chemical uptake between earlywood and latewood. Overall, it can be concluded that the results from FTIR, NIR and X-ray densitometry can serve as indicators of impregnation chemical distribution in SorCA-modified wood.\n
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\n\n \n \n \n \n \n Investigations of the Chemical Distribution in Sorbitol and Citric Acid (SorCA) Treated Wood—Development of a Quality Control Method on the Basis of Electromagnetic Radiation.\n \n \n \n\n\n \n Kurkowiak, K.; Mayer, A. K; Emmerich, L.; and Militz, H.\n\n\n \n\n\n\n ,15. 2022.\n
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\n\n \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{kurkowiak_investigations_2022-1,\n\ttitle = {Investigations of the {Chemical} {Distribution} in {Sorbitol} and {Citric} {Acid} ({SorCA}) {Treated} {Wood}—{Development} of a {Quality} {Control} {Method} on the {Basis} of {Electromagnetic} {Radiation}},\n\tabstract = {Recent studies showed treatments with sorbitol and citric acid (SorCA) to significantly improve the dimensional stability and biological durability of wood. The industrialization of this process requires a quality control (QC) method to determine if the fixated chemicals are homogenously distributed within the piece of wood, which is essential for uniform material performance. Therefore, the objective of this work was to evaluate the use of common electromagnetic radiation-based methods to determine the degree of modification in SorCA-treated wood. Both Fourier transform infrared (FTIR) spectroscopy and near-infrared (NIR) spectroscopy have been used to create rough calibrations for the weight percent gain (WPG) prediction models. The FTIR measurements resulted in a high linear correlation between the band area ratio (BAR) and the WPG (R2 = 0.93). Additionally, a partial least square (PLS) regression of NIR spectroscopic data resulted in a model with a high prediction power (R2 = 0.83). Furthermore, X-ray density profiling emerged as a simple alternative for the QC by showing a gradient of modification chemicals inside the sample and differences in chemical uptake between earlywood and latewood. Overall, it can be concluded that the results from FTIR, NIR and X-ray densitometry can serve as indicators of impregnation chemical distribution in SorCA-modified wood.},\n\tlanguage = {en},\n\tauthor = {Kurkowiak, Katarzyna and Mayer, Aaron K and Emmerich, Lukas and Militz, Holger},\n\tyear = {2022},\n\tpages = {15},\n\tfile = {Kurkowiak et al. - 2022 - Investigations of the Chemical Distribution in Sor.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\UUZLRJCJ\\\\Kurkowiak et al. - 2022 - Investigations of the Chemical Distribution in Sor.pdf:application/pdf},\n}\n\n
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\n Recent studies showed treatments with sorbitol and citric acid (SorCA) to significantly improve the dimensional stability and biological durability of wood. The industrialization of this process requires a quality control (QC) method to determine if the fixated chemicals are homogenously distributed within the piece of wood, which is essential for uniform material performance. Therefore, the objective of this work was to evaluate the use of common electromagnetic radiation-based methods to determine the degree of modification in SorCA-treated wood. Both Fourier transform infrared (FTIR) spectroscopy and near-infrared (NIR) spectroscopy have been used to create rough calibrations for the weight percent gain (WPG) prediction models. The FTIR measurements resulted in a high linear correlation between the band area ratio (BAR) and the WPG (R2 = 0.93). Additionally, a partial least square (PLS) regression of NIR spectroscopic data resulted in a model with a high prediction power (R2 = 0.83). Furthermore, X-ray density profiling emerged as a simple alternative for the QC by showing a gradient of modification chemicals inside the sample and differences in chemical uptake between earlywood and latewood. Overall, it can be concluded that the results from FTIR, NIR and X-ray densitometry can serve as indicators of impregnation chemical distribution in SorCA-modified wood.\n
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\n\n \n \n \n \n \n \n Durability and protection of mass timber structures: A review.\n \n \n \n \n\n\n \n Ayanleye, S.; Udele, K.; Nasir, V.; Zhang, X.; and Militz, H.\n\n\n \n\n\n\n
Journal of Building Engineering, 46: 103731. April 2022.\n
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@article{ayanleye_durability_2022,\n\ttitle = {Durability and protection of mass timber structures: {A} review},\n\tvolume = {46},\n\tissn = {23527102},\n\tshorttitle = {Durability and protection of mass timber structures},\n\turl = {https://linkinghub.elsevier.com/retrieve/pii/S2352710221015898},\n\tdoi = {10.1016/j.jobe.2021.103731},\n\tabstract = {Mass timber (MT), a group of large engineered structural wooden panels such as cross-laminated timber (CLT), glue-laminated timber (Glulam), laminated veneer lumber (LVL), etc., is becoming increasingly popular due to sustainable construction. Despite the numerous benefits of MT-based buildings, such as low-carbon emission, short construction time, and cost-effectiveness, the concerns regarding the durability of MT may limit their market acceptance. In this review, we discuss the advantages and opportunities of applying MT in tall buildings, as well as the durability issues associated with MT application. We examine the traditional wood protection techniques including, preservative treatment, thermal and chemical modification, and discuss the potential of applying these techniques for MT protection. We survey the recent studies on MT durability evaluation, as well as the recent progress in MT structure protection through a moisture control strategy. Finally, we highlight the MT protection strategies through the preservative, thermal, and chemical treatment approaches, review the effects of these treatment methods on the properties of MT such as wettability, glue penetration, bonding strength, etc., and discuss the future of the field.},\n\tlanguage = {en},\n\turldate = {2021-12-13},\n\tjournal = {Journal of Building Engineering},\n\tauthor = {Ayanleye, Samuel and Udele, Kenneth and Nasir, Vahid and Zhang, Xuefeng and Militz, Holger},\n\tmonth = apr,\n\tyear = {2022},\n\tpages = {103731},\n\tfile = {Ayanleye et al. - 2022 - Durability and protection of mass timber structure.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\VWPKKUAA\\\\Ayanleye et al. - 2022 - Durability and protection of mass timber structure.pdf:application/pdf},\n}\n\n
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\n Mass timber (MT), a group of large engineered structural wooden panels such as cross-laminated timber (CLT), glue-laminated timber (Glulam), laminated veneer lumber (LVL), etc., is becoming increasingly popular due to sustainable construction. Despite the numerous benefits of MT-based buildings, such as low-carbon emission, short construction time, and cost-effectiveness, the concerns regarding the durability of MT may limit their market acceptance. In this review, we discuss the advantages and opportunities of applying MT in tall buildings, as well as the durability issues associated with MT application. We examine the traditional wood protection techniques including, preservative treatment, thermal and chemical modification, and discuss the potential of applying these techniques for MT protection. We survey the recent studies on MT durability evaluation, as well as the recent progress in MT structure protection through a moisture control strategy. Finally, we highlight the MT protection strategies through the preservative, thermal, and chemical treatment approaches, review the effects of these treatment methods on the properties of MT such as wettability, glue penetration, bonding strength, etc., and discuss the future of the field.\n
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\n\n \n \n \n \n \n \n Wood chemical modification based on bio-based polycarboxylic acid and polyols – status quo and future perspectives.\n \n \n \n \n\n\n \n Kurkowiak, K.; Emmerich, L.; and Militz, H.\n\n\n \n\n\n\n
Wood Material Science & Engineering, 17(6): 1040–1054. November 2022.\n
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@article{kurkowiak_wood_2022-1,\n\ttitle = {Wood chemical modification based on bio-based polycarboxylic acid and polyols – status quo and future perspectives},\n\tvolume = {17},\n\tissn = {1748-0272, 1748-0280},\n\turl = {https://www.tandfonline.com/doi/full/10.1080/17480272.2021.1925961},\n\tdoi = {10.1080/17480272.2021.1925961},\n\tabstract = {Novel approaches for a non-toxic protection of timber have been investigated and referred to as “wood modification”. Especially, chemical impregnation modifications show promising opportunities to improve a wide range of wood properties. Yet, most of the available treatments resort to technically synthesized oil-based chemicals. Therefore, new ways of wood modification based on citric acid (CA) and bio-based low-molecular-weight polyols (CA-PO) – both originating from renewable resources – are under test and appear to be a promising alternative to available processes. The mode of action is expected to be a combination of both a cell wall bulking, and a cross-linking between CA-PO polyesters and wood cell wall polymers. However, the treatment process requires optimization with regard to the impregnation system and parameters for an industrial scale implementation. This paper provides a general background about CA-based solid wood treatment and its effects on the characteristics of wood. Moreover, it discusses current developments in this area and points out existing research gaps, with one focus being the process of development on an industrial scale.},\n\tlanguage = {en},\n\tnumber = {6},\n\turldate = {2022-12-13},\n\tjournal = {Wood Material Science \\& Engineering},\n\tauthor = {Kurkowiak, Katarzyna and Emmerich, Lukas and Militz, Holger},\n\tmonth = nov,\n\tyear = {2022},\n\tpages = {1040--1054},\n\tfile = {Kurkowiak et al. - 2022 - Wood chemical modification based on bio-based poly.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\56ZEM64Q\\\\Kurkowiak et al. - 2022 - Wood chemical modification based on bio-based poly.pdf:application/pdf},\n}\n\n
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\n Novel approaches for a non-toxic protection of timber have been investigated and referred to as “wood modification”. Especially, chemical impregnation modifications show promising opportunities to improve a wide range of wood properties. Yet, most of the available treatments resort to technically synthesized oil-based chemicals. Therefore, new ways of wood modification based on citric acid (CA) and bio-based low-molecular-weight polyols (CA-PO) – both originating from renewable resources – are under test and appear to be a promising alternative to available processes. The mode of action is expected to be a combination of both a cell wall bulking, and a cross-linking between CA-PO polyesters and wood cell wall polymers. However, the treatment process requires optimization with regard to the impregnation system and parameters for an industrial scale implementation. This paper provides a general background about CA-based solid wood treatment and its effects on the characteristics of wood. Moreover, it discusses current developments in this area and points out existing research gaps, with one focus being the process of development on an industrial scale.\n
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\n\n \n \n \n \n \n \n Biological Durability of Wood–Polymer Composites—The Role of Moisture and Aging.\n \n \n \n \n\n\n \n Buschalsky, A.; Brischke, C.; Klein, K. C.; Kilian, T.; and Militz, H.\n\n\n \n\n\n\n
Materials, 15(23): 8556. January 2022.\n
Number: 23 Publisher: Multidisciplinary Digital Publishing Institute\n\n
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@article{buschalsky_biological_2022,\n\ttitle = {Biological {Durability} of {Wood}–{Polymer} {Composites}—{The} {Role} of {Moisture} and {Aging}},\n\tvolume = {15},\n\tcopyright = {http://creativecommons.org/licenses/by/3.0/},\n\tissn = {1996-1944},\n\turl = {https://www.mdpi.com/1996-1944/15/23/8556},\n\tdoi = {10.3390/ma15238556},\n\tabstract = {Knowledge about the resistance of wood–polymer composites (WPCs) to biological attack is of high importance for purpose-oriented use in outdoor applications. To gain this knowledge, uniform test methods are essential. EN 15534-1 (2018) provides a general framework, including the recommendation of applying a pre-weathering procedure before the biological laboratory tests. However, the procedure’s manner is not specified, and its necessity assumes that a durability test without such pre-weathering will not produce the structural changes that occur during outdoor use. To verify this assumption, this study examined the influence of natural, ground-level pre-weathering on the material properties of different WPC variants, which were tested at intervals of six months in four durability tests under laboratory conditions in accordance with EN 15534-1 (2018). Weathering factors were calculated from determined characteristic values such as mass loss, and loss in moduli of elasticity (MOE) and rupture (MOR). The weathering factors based on mechanical properties tended to decrease with increasing weathering duration. The expected negative influence of pre-weathering on these material properties was thus not confirmed. The weathering factors based on mass loss were subject to high variation. No significant effect of pre-weathering on mass loss due to fungal attack became evident. Overall, the necessity of a pre-weathering step in biological durability tests shall be questioned based on the presented results.},\n\tlanguage = {en},\n\tnumber = {23},\n\turldate = {2022-12-01},\n\tjournal = {Materials},\n\tauthor = {Buschalsky, Andreas and Brischke, Christian and Klein, Kim Christian and Kilian, Thomas and Militz, Holger},\n\tmonth = jan,\n\tyear = {2022},\n\tnote = {Number: 23\nPublisher: Multidisciplinary Digital Publishing Institute},\n\tkeywords = {durability test, WPC, basidiomycetes, EN 15534-1, wood–moisture interaction, soft rot, biological durability, wood–polymer composites},\n\tpages = {8556},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\7EYDSMN5\\\\Buschalsky et al. - 2022 - Biological Durability of Wood–Polymer Composites—T.pdf:application/pdf},\n}\n\n
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\n Knowledge about the resistance of wood–polymer composites (WPCs) to biological attack is of high importance for purpose-oriented use in outdoor applications. To gain this knowledge, uniform test methods are essential. EN 15534-1 (2018) provides a general framework, including the recommendation of applying a pre-weathering procedure before the biological laboratory tests. However, the procedure’s manner is not specified, and its necessity assumes that a durability test without such pre-weathering will not produce the structural changes that occur during outdoor use. To verify this assumption, this study examined the influence of natural, ground-level pre-weathering on the material properties of different WPC variants, which were tested at intervals of six months in four durability tests under laboratory conditions in accordance with EN 15534-1 (2018). Weathering factors were calculated from determined characteristic values such as mass loss, and loss in moduli of elasticity (MOE) and rupture (MOR). The weathering factors based on mechanical properties tended to decrease with increasing weathering duration. The expected negative influence of pre-weathering on these material properties was thus not confirmed. The weathering factors based on mass loss were subject to high variation. No significant effect of pre-weathering on mass loss due to fungal attack became evident. Overall, the necessity of a pre-weathering step in biological durability tests shall be questioned based on the presented results.\n
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\n\n \n \n \n \n \n Biological Durability of Wood–Polymer Composites—The Role of Moisture and Aging.\n \n \n \n\n\n \n Buschalsky, A.; Brischke, C.; Klein, K. C.; Kilian, T.; and Militz, H.\n\n\n \n\n\n\n ,12. 2022.\n
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@article{buschalsky_biological_2022-1,\n\ttitle = {Biological {Durability} of {Wood}–{Polymer} {Composites}—{The} {Role} of {Moisture} and {Aging}},\n\tabstract = {Knowledge about the resistance of wood–polymer composites (WPCs) to biological attack is of high importance for purpose-oriented use in outdoor applications. To gain this knowledge, uniform test methods are essential. EN 15534-1 (2018) provides a general framework, including the recommendation of applying a pre-weathering procedure before the biological laboratory tests. However, the procedure’s manner is not specified, and its necessity assumes that a durability test without such pre-weathering will not produce the structural changes that occur during outdoor use. To verify this assumption, this study examined the influence of natural, ground-level pre-weathering on the material properties of different WPC variants, which were tested at intervals of six months in four durability tests under laboratory conditions in accordance with EN 15534-1 (2018). Weathering factors were calculated from determined characteristic values such as mass loss, and loss in moduli of elasticity (MOE) and rupture (MOR). The weathering factors based on mechanical properties tended to decrease with increasing weathering duration. The expected negative influence of pre-weathering on these material properties was thus not confirmed. The weathering factors based on mass loss were subject to high variation. No significant effect of pre-weathering on mass loss due to fungal attack became evident. Overall, the necessity of a pre-weathering step in biological durability tests shall be questioned based on the presented results.},\n\tlanguage = {en},\n\tauthor = {Buschalsky, Andreas and Brischke, Christian and Klein, Kim Christian and Kilian, Thomas and Militz, Holger},\n\tyear = {2022},\n\tpages = {12},\n\tfile = {Buschalsky et al. - 2022 - Biological Durability of Wood–Polymer Composites—T.pdf:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\QAEGVNW2\\\\Buschalsky et al. - 2022 - Biological Durability of Wood–Polymer Composites—T.pdf:application/pdf},\n}\n\n
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\n Knowledge about the resistance of wood–polymer composites (WPCs) to biological attack is of high importance for purpose-oriented use in outdoor applications. To gain this knowledge, uniform test methods are essential. EN 15534-1 (2018) provides a general framework, including the recommendation of applying a pre-weathering procedure before the biological laboratory tests. However, the procedure’s manner is not specified, and its necessity assumes that a durability test without such pre-weathering will not produce the structural changes that occur during outdoor use. To verify this assumption, this study examined the influence of natural, ground-level pre-weathering on the material properties of different WPC variants, which were tested at intervals of six months in four durability tests under laboratory conditions in accordance with EN 15534-1 (2018). Weathering factors were calculated from determined characteristic values such as mass loss, and loss in moduli of elasticity (MOE) and rupture (MOR). The weathering factors based on mechanical properties tended to decrease with increasing weathering duration. The expected negative influence of pre-weathering on these material properties was thus not confirmed. The weathering factors based on mass loss were subject to high variation. No significant effect of pre-weathering on mass loss due to fungal attack became evident. Overall, the necessity of a pre-weathering step in biological durability tests shall be questioned based on the presented results.\n
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\n\n \n \n \n \n \n \n Impregnation Properties of Nigerian-Grown Gmelina arborea Roxb. Wood.\n \n \n \n \n\n\n \n Olaniran, S. O.; Löning, S.; Buschalsky, A.; and Militz, H.\n\n\n \n\n\n\n
Forests, 13(12): 2036. December 2022.\n
Number: 12 Publisher: Multidisciplinary Digital Publishing Institute\n\n
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@article{olaniran_impregnation_2022,\n\ttitle = {Impregnation {Properties} of {Nigerian}-{Grown} {Gmelina} arborea {Roxb}. {Wood}},\n\tvolume = {13},\n\tcopyright = {http://creativecommons.org/licenses/by/3.0/},\n\tissn = {1999-4907},\n\turl = {https://www.mdpi.com/1999-4907/13/12/2036},\n\tdoi = {10.3390/f13122036},\n\tabstract = {The success of any wood treatment process and the measure of protection conferred on treated wood are determined by the uptake and penetration of the treatment chemicals, in addition to the efficacy of the chemicals used for the treatment. Hence, the level of treatability of wood species should be pre-determined prior to the wood treatment to ensure the overall protection of the treated wood. Gmelina arborea wood, due to its low durability, requires impregnation with chemicals for preservation or chemical modification to enhance its durability. However, more details are required to establish the influence of its anatomy on impregnation to recommend appropriate treatment methods. Therefore, gmelina wood samples were treated under pressure to determine the solution uptake and penetration, while anatomical studies were carried out with light microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) measurements. Variations in stem heights, stem diameters, and samples from other tree stands were considered. The outcome of the study showed that the liquid uptake was generally low for gmelina wood among the selected stands (16–23\\%) and there was no significant difference in stem diameters; meanwhile, penetration was less than 4 mm in the axial direction, and very low in the lateral (radial and tangential) direction. Vessels of gmelina wood have abundant tyloses, while crystalline structures with needlelike shapes are present in a large proportion of the ray parenchyma cells, and are confirmed with SEM-EDX to be made up of calcium oxalate. The low liquid uptake and penetration in gmelina wood suggest that the impregnation of chemicals into its microstructure is next to impossible. Hence, alternative treatment methods other than those involving impregnation with chemicals should be sought to enhance its durability.},\n\tlanguage = {en},\n\tnumber = {12},\n\turldate = {2022-11-30},\n\tjournal = {Forests},\n\tauthor = {Olaniran, Samuel Oluyinka and Löning, Sophie and Buschalsky, Andreas and Militz, Holger},\n\tmonth = dec,\n\tyear = {2022},\n\tnote = {Number: 12\nPublisher: Multidisciplinary Digital Publishing Institute},\n\tkeywords = {light microscopy, anatomy, Gmelina wood, impregnation, Nigerian-grown, SEM-EDX, uptake},\n\tpages = {2036},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\7NPM3GVN\\\\Olaniran et al. - 2022 - Impregnation Properties of Nigerian-Grown Gmelina .pdf:application/pdf},\n}\n\n
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\n The success of any wood treatment process and the measure of protection conferred on treated wood are determined by the uptake and penetration of the treatment chemicals, in addition to the efficacy of the chemicals used for the treatment. Hence, the level of treatability of wood species should be pre-determined prior to the wood treatment to ensure the overall protection of the treated wood. Gmelina arborea wood, due to its low durability, requires impregnation with chemicals for preservation or chemical modification to enhance its durability. However, more details are required to establish the influence of its anatomy on impregnation to recommend appropriate treatment methods. Therefore, gmelina wood samples were treated under pressure to determine the solution uptake and penetration, while anatomical studies were carried out with light microscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) measurements. Variations in stem heights, stem diameters, and samples from other tree stands were considered. The outcome of the study showed that the liquid uptake was generally low for gmelina wood among the selected stands (16–23%) and there was no significant difference in stem diameters; meanwhile, penetration was less than 4 mm in the axial direction, and very low in the lateral (radial and tangential) direction. Vessels of gmelina wood have abundant tyloses, while crystalline structures with needlelike shapes are present in a large proportion of the ray parenchyma cells, and are confirmed with SEM-EDX to be made up of calcium oxalate. The low liquid uptake and penetration in gmelina wood suggest that the impregnation of chemicals into its microstructure is next to impossible. Hence, alternative treatment methods other than those involving impregnation with chemicals should be sought to enhance its durability.\n
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\n\n \n \n \n \n \n Self-locking of finger joints - Influence of density and moisture content.\n \n \n \n\n\n \n Stolze, H.; Trautwein, J.; Mayer, A. K.; Theis, V.; Bollmus, S.; and Militz, H.\n\n\n \n\n\n\n In
Hardwood Conference Proceedings, pages 317–323, Sopron, Hungary, 2022. University of Sopron Press\n
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@inproceedings{stolze_self-locking_2022,\n\taddress = {Sopron, Hungary},\n\ttitle = {Self-locking of finger joints - {Influence} of density and moisture content},\n\tisbn = {978-963-334-446-0},\n\tlanguage = {EN},\n\tbooktitle = {Hardwood {Conference} {Proceedings}},\n\tpublisher = {University of Sopron Press},\n\tauthor = {Stolze, Hannes and Trautwein, Jan-Frederik and Mayer, Aaron Kilan and Theis, Viorica and Bollmus, Susanne and Militz, Holger},\n\tyear = {2022},\n\tpages = {317--323},\n}\n\n
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\n\n \n \n \n \n \n Investigation of Poplar-Plywood impregnated with a mixture of sorbitol and citric acid (SorCA).\n \n \n \n\n\n \n Slabohm, M.; Kurkowiak, K.; Rabke, J.; Debuisson, R.; and Militz, H.\n\n\n \n\n\n\n In
Hardwood Conference Proceedings, pages 228–235, Sopron, Hungary, 2022. University of Sopron Press\n
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@inproceedings{slabohm_investigation_2022,\n\taddress = {Sopron, Hungary},\n\ttitle = {Investigation of {Poplar}-{Plywood} impregnated with a mixture of sorbitol and citric acid ({SorCA})},\n\tisbn = {978-963-334-446-0},\n\tlanguage = {EN},\n\tbooktitle = {Hardwood {Conference} {Proceedings}},\n\tpublisher = {University of Sopron Press},\n\tauthor = {Slabohm, Maik and Kurkowiak, Katarzyna and Rabke, Joshua and Debuisson, Robin and Militz, Holger},\n\tyear = {2022},\n\tpages = {228--235},\n}\n\n
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\n\n \n \n \n \n \n Acetylated Beech LVL: Anti-swelling-efficiency, leaching, and set recovery.\n \n \n \n\n\n \n Slabohm, M.; and Militz, H.\n\n\n \n\n\n\n In
Hardwood Conference Proceedings, pages 222–227, Sopron, Hungary, 2022. University of Sopron Press\n
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@inproceedings{slabohm_acetylated_2022,\n\taddress = {Sopron, Hungary},\n\ttitle = {Acetylated {Beech} {LVL}: {Anti}-swelling-efficiency, leaching, and set recovery},\n\tisbn = {978-963-334-446-0},\n\tlanguage = {EN},\n\tbooktitle = {Hardwood {Conference} {Proceedings}},\n\tpublisher = {University of Sopron Press},\n\tauthor = {Slabohm, Maik and Militz, Holger},\n\tyear = {2022},\n\tpages = {222--227},\n}\n\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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\n\n \n \n \n \n \n \n Effect of pressurized hot water extraction and esterification on the moisture properties and decay resistance of Scots pine (Pinus sylvestris L.) sapwood.\n \n \n \n \n\n\n \n Kyyrö, S.; Altgen, M.; Belt, T.; Seppäläinen, H.; Brischke, C.; Heinze, P.; Militz, H.; and Rautkari, L.\n\n\n \n\n\n\n
Holzforschung. September 2022.\n
Publisher: De Gruyter\n\n
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@article{kyyro_effect_2022,\n\ttitle = {Effect of pressurized hot water extraction and esterification on the moisture properties and decay resistance of {Scots} pine ({Pinus} sylvestris {L}.) sapwood},\n\tissn = {1437-434X},\n\turl = {https://www.degruyter.com/document/doi/10.1515/hf-2022-0100/html},\n\tdoi = {10.1515/hf-2022-0100},\n\tabstract = {Pressurized hot water extraction (HWE) treatment has the benefit of simultaneous extraction of hemicellulose-based carbohydrates and modification of the solid phase, but it does not drastically improve wood durability. However, removing hemicelluloses from the wood by HWE treatment creates water-filled spaces in the cell walls which could be filled with modification agent in order to improve the properties of the wood. Without drying, modification agent can be added into the saturated wood via diffusion. The esterification of wood with citric acid (CA) improves resistance to biological deterioration but increases brittleness. However, combining CA esterification with additional chemicals that form links with CA can mitigate brittleness. This study investigated esterification as a method for modifying HWE treated wood. HWE treatment with CA solution (4\\% w/v) was applied at 120 °C for 3 h to Scots pine ( Pinus sylvestris L.) sapwood specimens. The specimens were further modified by diffusion with CA and starch derivatives followed by curing. The applied method changed the moisture properties and chemical composition of the wood. The results showed successful wood bulking. The investigated method slightly improved decay resistance to Coniophora puteana and Trametes versicolor but did not change resistance to Rhodonia placenta .},\n\tlanguage = {en},\n\turldate = {2022-09-19},\n\tjournal = {Holzforschung},\n\tauthor = {Kyyrö, Suvi and Altgen, Michael and Belt, Tiina and Seppäläinen, Hanna and Brischke, Christian and Heinze, Petra and Militz, Holger and Rautkari, Lauri},\n\tmonth = sep,\n\tyear = {2022},\n\tnote = {Publisher: De Gruyter},\n\tkeywords = {wood modification, hygroscopicity, citric acid, starch, biological durability},\n}\n\n
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\n Pressurized hot water extraction (HWE) treatment has the benefit of simultaneous extraction of hemicellulose-based carbohydrates and modification of the solid phase, but it does not drastically improve wood durability. However, removing hemicelluloses from the wood by HWE treatment creates water-filled spaces in the cell walls which could be filled with modification agent in order to improve the properties of the wood. Without drying, modification agent can be added into the saturated wood via diffusion. The esterification of wood with citric acid (CA) improves resistance to biological deterioration but increases brittleness. However, combining CA esterification with additional chemicals that form links with CA can mitigate brittleness. This study investigated esterification as a method for modifying HWE treated wood. HWE treatment with CA solution (4% w/v) was applied at 120 °C for 3 h to Scots pine ( Pinus sylvestris L.) sapwood specimens. The specimens were further modified by diffusion with CA and starch derivatives followed by curing. The applied method changed the moisture properties and chemical composition of the wood. The results showed successful wood bulking. The investigated method slightly improved decay resistance to Coniophora puteana and Trametes versicolor but did not change resistance to Rhodonia placenta .\n
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\n\n \n \n \n \n \n Quality control of esterified wood using hyperspectral imaging.\n \n \n \n\n\n \n Kurkowiak, K.; Altgen, M.; Awais, M.; Rautkari, L.; and Militz, H.\n\n\n \n\n\n\n In
Proceedings of the 18th meeting of the Northern European Network for Wood Science and Engineering (WSE 2022), pages 89–91, Göttingen, Germany, September 2022. \n
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@inproceedings{kurkowiak_quality_2022,\n\taddress = {Göttingen, Germany},\n\ttitle = {Quality control of esterified wood using hyperspectral imaging},\n\tlanguage = {EN},\n\tbooktitle = {Proceedings of the 18th meeting of the {Northern} {European} {Network} for {Wood} {Science} and {Engineering} ({WSE} 2022)},\n\tauthor = {Kurkowiak, K. and Altgen, M. and Awais, M. and Rautkari, L. and Militz, H.},\n\tmonth = sep,\n\tyear = {2022},\n\tpages = {89--91},\n}\n\n
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\n\n \n \n \n \n \n Vacuum low-temperature microwave-assisted pyrolysis of pine Kraft lignin – Products and potential applications.\n \n \n \n\n\n \n Karthäuser, J.; Biziks, V.; and Militz, H.\n\n\n \n\n\n\n In
Proceedings of the 18th meeting of the Northern European Network for Wood Science and Engineering (WSE 2022), pages 71–73, Göttingen, Germany, September 2022. \n
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@inproceedings{karthauser_vacuum_2022-1,\n\taddress = {Göttingen, Germany},\n\ttitle = {Vacuum low-temperature microwave-assisted pyrolysis of pine {Kraft} lignin – {Products} and potential applications},\n\tlanguage = {EN},\n\tbooktitle = {Proceedings of the 18th meeting of the {Northern} {European} {Network} for {Wood} {Science} and {Engineering} ({WSE} 2022)},\n\tauthor = {Karthäuser, Johannes and Biziks, Vladimir and Militz, Holger},\n\tmonth = sep,\n\tyear = {2022},\n\tpages = {71--73},\n}\n\n
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\n\n \n \n \n \n \n \n Radial microfibril arrangements in wood cell walls.\n \n \n \n \n\n\n \n Maaß, M. C.; Saleh, S.; Militz, H.; and Volkert, C. A.\n\n\n \n\n\n\n
Planta, 256(4): 75. September 2022.\n
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@article{maas_radial_2022,\n\ttitle = {Radial microfibril arrangements in wood cell walls},\n\tvolume = {256},\n\tissn = {1432-2048},\n\turl = {https://doi.org/10.1007/s00425-022-03976-2},\n\tdoi = {10.1007/s00425-022-03976-2},\n\tabstract = {TEM and AFM imaging reveal radial orientations and whorl-like arrangements of cellulose microfibrils near the S1/S2 interface. These are explained by wrinkling during lamellar cell growth.},\n\tlanguage = {en},\n\tnumber = {4},\n\turldate = {2022-09-12},\n\tjournal = {Planta},\n\tauthor = {Maaß, Mona C. and Saleh, Salimeh and Militz, Holger and Volkert, Cynthia A.},\n\tmonth = sep,\n\tyear = {2022},\n\tkeywords = {Cell wall layer wrinkling, Microfibril angle (MFA), Microfibril arrangement, S1/S2 interface, Ultrastructure, Whorl-like microfibril structure, Wood cell wall structure},\n\tpages = {75},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\SGBXQXXI\\\\Maaß et al. - 2022 - Radial microfibril arrangements in wood cell walls.pdf:application/pdf},\n}\n\n
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\n TEM and AFM imaging reveal radial orientations and whorl-like arrangements of cellulose microfibrils near the S1/S2 interface. These are explained by wrinkling during lamellar cell growth.\n
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\n\n \n \n \n \n \n \n Effect of pressurized hot water extraction and esterification on the moisture properties and decay resistance of Scots pine (Pinus sylvestris L.) sapwood.\n \n \n \n \n\n\n \n Kyyrö, S.; Altgen, M.; Belt, T.; Seppäläinen, H.; Brischke, C.; Heinze, P.; Militz, H.; and Rautkari, L.\n\n\n \n\n\n\n
Holzforschung, 76(10): 916–928. October 2022.\n
Publisher: De Gruyter\n\n
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@article{kyyro_effect_2022-1,\n\ttitle = {Effect of pressurized hot water extraction and esterification on the moisture properties and decay resistance of {Scots} pine ({Pinus} sylvestris {L}.) sapwood},\n\tvolume = {76},\n\tcopyright = {De Gruyter expressly reserves the right to use all content for commercial text and data mining within the meaning of Section 44b of the German Copyright Act.},\n\tissn = {1437-434X},\n\turl = {https://www.degruyter.com/document/doi/10.1515/hf-2022-0100/html?lang=en},\n\tdoi = {10.1515/hf-2022-0100},\n\tabstract = {Pressurized hot water extraction (HWE) treatment has the benefit of simultaneous extraction of hemicellulose-based carbohydrates and modification of the solid phase, but it does not drastically improve wood durability. However, removing hemicelluloses from the wood by HWE treatment creates water-filled spaces in the cell walls which could be filled with modification agent in order to improve the properties of the wood. Without drying, modification agent can be added into the saturated wood via diffusion. The esterification of wood with citric acid (CA) improves resistance to biological deterioration but increases brittleness. However, combining CA esterification with additional chemicals that form links with CA can mitigate brittleness. This study investigated esterification as a method for modifying HWE treated wood. HWE treatment with CA solution (4\\% w/v) was applied at 120 °C for 3 h to Scots pine ( Pinus sylvestris L.) sapwood specimens. The specimens were further modified by diffusion with CA and starch derivatives followed by curing. The applied method changed the moisture properties and chemical composition of the wood. The results showed successful wood bulking. The investigated method slightly improved decay resistance to Coniophora puteana and Trametes versicolor but did not change resistance to Rhodonia placenta .},\n\tlanguage = {en},\n\tnumber = {10},\n\turldate = {2024-01-11},\n\tjournal = {Holzforschung},\n\tauthor = {Kyyrö, Suvi and Altgen, Michael and Belt, Tiina and Seppäläinen, Hanna and Brischke, Christian and Heinze, Petra and Militz, Holger and Rautkari, Lauri},\n\tmonth = oct,\n\tyear = {2022},\n\tnote = {Publisher: De Gruyter},\n\tkeywords = {wood modification, hygroscopicity, citric acid, starch, biological durability},\n\tpages = {916--928},\n\tfile = {Full Text PDF:C\\:\\\\Users\\\\Eva\\\\Zotero\\\\storage\\\\3NTTJPK7\\\\Kyyrö et al. - 2022 - Effect of pressurized hot water extraction and est.pdf:application/pdf},\n}\n\n
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\n Pressurized hot water extraction (HWE) treatment has the benefit of simultaneous extraction of hemicellulose-based carbohydrates and modification of the solid phase, but it does not drastically improve wood durability. However, removing hemicelluloses from the wood by HWE treatment creates water-filled spaces in the cell walls which could be filled with modification agent in order to improve the properties of the wood. Without drying, modification agent can be added into the saturated wood via diffusion. The esterification of wood with citric acid (CA) improves resistance to biological deterioration but increases brittleness. However, combining CA esterification with additional chemicals that form links with CA can mitigate brittleness. This study investigated esterification as a method for modifying HWE treated wood. HWE treatment with CA solution (4% w/v) was applied at 120 °C for 3 h to Scots pine ( Pinus sylvestris L.) sapwood specimens. The specimens were further modified by diffusion with CA and starch derivatives followed by curing. The applied method changed the moisture properties and chemical composition of the wood. The results showed successful wood bulking. The investigated method slightly improved decay resistance to Coniophora puteana and Trametes versicolor but did not change resistance to Rhodonia placenta .\n
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