Altgen, Michael

[["dc.bibliographiccitation.firstpage","16561"],["dc.bibliographiccitation.issue","35"],["dc.bibliographiccitation.journal","Journal of Materials Science"],["dc.bibliographiccitation.lastpage","16575"],["dc.bibliographiccitation.volume","55"],["dc.contributor.author","Emmerich, Lukas"],["dc.contributor.author","Altgen, Michael"],["dc.contributor.author","Rautkari, Lauri"],["dc.contributor.author","Militz, Holger"],["dc.date.accessioned","2021-04-14T08:23:34Z"],["dc.date.available","2021-04-14T08:23:34Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1007/s10853-020-05224-y"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/80969"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1573-4803"],["dc.relation.issn","0022-2461"],["dc.title","Sorption behavior and hydroxyl accessibility of wood treated with different cyclic N-methylol compounds"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","889"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Wood Science and Technology"],["dc.bibliographiccitation.lastpage","907"],["dc.bibliographiccitation.volume","52"],["dc.contributor.author","Wentzel, M."],["dc.contributor.author","Altgen, M."],["dc.contributor.author","Militz, H."],["dc.date.accessioned","2020-12-10T14:09:56Z"],["dc.date.available","2020-12-10T14:09:56Z"],["dc.date.issued","2018"],["dc.identifier.doi","10.1007/s00226-018-1012-3"],["dc.identifier.eissn","1432-5225"],["dc.identifier.issn","0043-7719"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70609"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Analyzing reversible changes in hygroscopicity of thermally modified eucalypt wood from open and closed reactor systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","105529"],["dc.bibliographiccitation.journal","Composites Part A: Applied Science and Manufacturing"],["dc.bibliographiccitation.volume","125"],["dc.contributor.author","Altgen, Daniela"],["dc.contributor.author","Grigsby, Warren"],["dc.contributor.author","Altgen, Michael"],["dc.contributor.author","Rautkari, Lauri"],["dc.contributor.author","Mai, Carsten"],["dc.date.accessioned","2020-12-10T14:23:16Z"],["dc.date.available","2020-12-10T14:23:16Z"],["dc.date.issued","2019"],["dc.identifier.doi","10.1016/j.compositesa.2019.105529"],["dc.identifier.issn","1359-835X"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/71880"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Analyzing the UF resin distribution in particleboards by confocal laser scanning microscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","531"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH"],["dc.bibliographiccitation.lastpage","541"],["dc.bibliographiccitation.volume","14"],["dc.contributor.author","Altgen, Michael"],["dc.contributor.author","Militz, Holger"],["dc.date.accessioned","2018-11-07T10:24:37Z"],["dc.date.available","2018-11-07T10:24:37Z"],["dc.date.issued","2017"],["dc.description.abstract","Thermally modified wood (TMW) is increasingly used in exterior applications as an alternative to tropical hardwoods or wood impregnated with biocides. Despite its enhanced biological durability and dimensional stability, a surface treatment of TMW with coating systems can be required in certain applications. This study assessed material characteristics of Norway spruce and Scots pine wood that was thermally modified according to the ThermoWood(A (R)) process and their effect on the performance of commercially available coating systems: a solventborne oil, a waterborne alkyd-reinforced acrylate paint and a waterborne acrylate paint. Residual extractives and remaining degradation products found in TMW, carry the risk of causing discoloration or of interfering with the curing reactions of coating systems. The penetration of coating systems into TMW was not found to differ from unmodified wood, although an excessive penetration of solventborne oil was found occasionally for TMW. The adhesion strength of waterborne coatings depended on the system that was used. While one system performed sufficiently on TMW, the other coating systems showed a considerable reduction in adhesion strength already after a mild treatment (< 200A degrees C). This reduction could not be attributed to the increase in hydrophobicity of TMW that was evident from contact angle measurements, but was rather related to the mechanical interaction of the specific substrate/coating system."],["dc.description.sponsorship","International ThermoWood Association (Helsinki, Finland)"],["dc.identifier.doi","10.1007/s11998-016-9871-8"],["dc.identifier.isi","000399825800004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42694"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Springer"],["dc.relation.issn","1935-3804"],["dc.relation.issn","1945-9645"],["dc.title","Thermally modified Scots pine and Norway spruce wood as substrate for coating systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","417"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","European Journal of Wood and Wood Products"],["dc.bibliographiccitation.lastpage","420"],["dc.bibliographiccitation.volume","78"],["dc.contributor.author","Altgen, D."],["dc.contributor.author","Altgen, M."],["dc.contributor.author","Kyyrö, S."],["dc.contributor.author","Rautkari, L."],["dc.contributor.author","Mai, C."],["dc.date.accessioned","2020-12-10T14:08:22Z"],["dc.date.available","2020-12-10T14:08:22Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1007/s00107-020-01505-0"],["dc.identifier.eissn","1436-736X"],["dc.identifier.issn","0018-3768"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70440"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Time-dependent wettability changes on plasma-treated surfaces of unmodified and thermally modified European beech wood"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1181"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Wood Science and Technology"],["dc.bibliographiccitation.lastpage","1195"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Altgen, Michael"],["dc.contributor.author","Hofmann, Tamas"],["dc.contributor.author","Militz, Holger"],["dc.date.accessioned","2018-11-07T10:06:45Z"],["dc.date.available","2018-11-07T10:06:45Z"],["dc.date.issued","2016"],["dc.description.abstract","Elevated wood moisture contents during the thermal modification process have been shown to adversely affect the improvement in dimensional stability and hygroscopicity. This study tested the hypothesis that the effect of elevated wood moisture content is based on the impact of water on chemical reactions which determine the cell wall matrix stiffness. Samples of Scots pine sapwood (Pinus sylvestris L.) were thermally modified in saturated water vapor at different peak temperatures and durations starting either in oven-dry or in water-saturated state. For a given mass loss caused by the modification process, the improvement in maximum swelling and equilibrium moisture content was stronger for oven-dry samples. After removal of water-soluble degradation products, which caused a cell wall bulking effect, the maximum swelling even increased after modification in water-saturated state. Based on dynamic vapor sorption measurements, it was evidenced that the modification in oven-dry state increased the cell wall matrix stiffness which improved dimensional stability and hygroscopicity. Enhanced bond formation in the polymeric network, i.e., via condensation and cross-linking reactions during the treatment of oven-dry wood, is suggested as a cause for this increase in matrix stiffness. In contrast, the modification in water-saturated state enhanced the flexibility of the cell wall matrix, which increased the cell wall swelling and limited the improvement of hygroscopicity to the reduction in OH groups by removal of hemicelluloses. This enhanced matrix flexibility was potentially caused by predominant hydrolytic cleavage of bonds in case of water-saturated samples, evident from the chemical analysis of soluble degradation products, which increased the free volume between adjacent matrix polymers."],["dc.identifier.doi","10.1007/s00226-016-0845-x"],["dc.identifier.isi","385252600006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39152"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1432-5225"],["dc.relation.issn","0043-7719"],["dc.title","Wood moisture content during the thermal modification process affects the improvement in hygroscopicity of Scots pine sapwood"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","916"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Holzforschung"],["dc.bibliographiccitation.lastpage","928"],["dc.bibliographiccitation.volume","76"],["dc.contributor.author","Kyyrö, Suvi"],["dc.contributor.author","Altgen, Michael"],["dc.contributor.author","Belt, Tiina"],["dc.contributor.author","Seppäläinen, Hanna"],["dc.contributor.author","Brischke, Christian"],["dc.contributor.author","Heinze, Petra"],["dc.contributor.author","Militz, Holger"],["dc.contributor.author","Rautkari, Lauri"],["dc.date.accessioned","2022-10-04T10:22:05Z"],["dc.date.available","2022-10-04T10:22:05Z"],["dc.date.issued","2022"],["dc.description.abstract","Abstract\n \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 (\n Pinus sylvestris\n 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\n Coniophora puteana\n and\n Trametes versicolor\n but did not change resistance to\n Rhodonia placenta\n ."],["dc.identifier.doi","10.1515/hf-2022-0100"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/114583"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-600"],["dc.relation.eissn","1437-434X"],["dc.relation.issn","0018-3830"],["dc.title","Effect of pressurized hot water extraction and esterification on the moisture properties and decay resistance of Scots pine (\n Pinus sylvestris\n L.) sapwood"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Scientific Reports"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Altgen, Michael"],["dc.contributor.author","Awais, Muhammad"],["dc.contributor.author","Altgen, Daniela"],["dc.contributor.author","Klüppel, André"],["dc.contributor.author","Mäkelä, Mikko"],["dc.contributor.author","Rautkari, Lauri"],["dc.date.accessioned","2021-04-14T08:27:11Z"],["dc.date.available","2021-04-14T08:27:11Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1038/s41598-020-60418-3"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82196"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","2045-2322"],["dc.title","Distribution and curing reactions of melamine formaldehyde resin in cells of impregnation-modified wood"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Forests"],["dc.bibliographiccitation.volume","13"],["dc.contributor.affiliation","Zelinka, Samuel L.; 1Forest Products Laboratory, US Forest Service, Madison, WI 53726, USA"],["dc.contributor.affiliation","Altgen, Michael; 2Department of Biology, Institute of Wood Science, University Hamburg, DE-20146 Hamburg, Germany; michael.altgen@uni-hamburg.de"],["dc.contributor.affiliation","Emmerich, Lukas; 3Department of Wood Biology and Wood Products, University of Göttingen, DE-37073 Göttingen, Germany; lukas.emmerich@uni-goettingen.de"],["dc.contributor.affiliation","Guigo, Nathanael; 4Institut de Chimie de Nice, Université Côte d’Azur, CNRS, UMR 7272, FR-06108 Nice, France; nathanael.guigo@univ-cotedazur.fr"],["dc.contributor.affiliation","Keplinger, Tobias; 5Austrocel Hallein GmbH, 5400 Hallein, Austria; tobias.keplinger@austrocel.com"],["dc.contributor.affiliation","Kymäläinen, Maija; 6Department of Bioproducts and Biosystems, Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland; maija.kymalainen@aalto.fi"],["dc.contributor.affiliation","Thybring, Emil E.; 7Department of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, DK-1958 Frederiksberg C, Denmark; eet@ign.ku.dk (E.E.T.); lgt@ign.ku.dk (L.G.T.)"],["dc.contributor.affiliation","Thygesen, Lisbeth G.; 7Department of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, DK-1958 Frederiksberg C, Denmark; eet@ign.ku.dk (E.E.T.); lgt@ign.ku.dk (L.G.T.)"],["dc.contributor.author","Zelinka, Samuel L."],["dc.contributor.author","Altgen, Michael"],["dc.contributor.author","Emmerich, Lukas"],["dc.contributor.author","Guigo, Nathanael"],["dc.contributor.author","Keplinger, Tobias"],["dc.contributor.author","Kymäläinen, Maija"],["dc.contributor.author","Thybring, Emil E."],["dc.contributor.author","Thygesen, Lisbeth G."],["dc.date.accessioned","2022-07-11T06:53:38Z"],["dc.date.available","2022-07-11T06:53:38Z"],["dc.date.issued","2022-06-26"],["dc.date.updated","2022-07-08T12:13:01Z"],["dc.description.abstract","Wood modifications are becoming popular as a way to enhance the performance of wood, either to make it more durable, improve the performance of wood, or give it new functionality as a multifunctional or smart material. While wood modifications have been examined since the early 1900s, the topic has become a dominant area of study in wood science over the past decade. This review summarizes recent advances and provides future perspective on a selection of wood modifications, i.e., the methods that are currently commercialized (acetylation, furfurylation, and thermal modification), a rediscovered ancient practice (charring), a family of polymerization modifications that have so far made it to the pilot scale, and examples of novel wood-based functional materials explored at laboratory scale."],["dc.description.sponsorship","EU Interreg Öresund-Kattegat Skagerrak"],["dc.identifier.doi","10.3390/f13071004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/112423"],["dc.language.iso","en"],["dc.relation.eissn","1999-4907"],["dc.rights","CC BY 4.0"],["dc.title","Review of Wood Modification and Wood Functionalization Technologies"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","875"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Holzforschung"],["dc.bibliographiccitation.lastpage","884"],["dc.bibliographiccitation.volume","69"],["dc.contributor.author","Willems, Wim"],["dc.contributor.author","Lykidis, Charalampos"],["dc.contributor.author","Altgen, Michael"],["dc.contributor.author","Clauder, Lothar"],["dc.date.accessioned","2018-11-07T09:52:38Z"],["dc.date.available","2018-11-07T09:52:38Z"],["dc.date.issued","2015"],["dc.description.abstract","Thermally modified wood (TMW) is currently produced commercially by a range of processes across many countries. A prerequisite of the commercial success is an efficient quality control (QC), and methods with this regard are discussed in this review. When direct measurement of the key attribute of the material is not feasible, QC is based on a suitably chosen physical or chemical \"marker\". A critical evaluation of currently applied markers reveals that most of them only provide data for comparative purposes for a particular species and/or over a narrow process range. Such markers do not allow making an objective judgment of quality, which is independent of process information or reference samples provided by the manufacturer. On the other hand, they can be very useful for monitoring product variability in the TMW factory and wood during the heat treatment. Recommendations for future development are the general validation of (combinations of) known TMW markers for different wood species and processes, resulting in (1) a reliable and fast laboratory QC method for given samples of unknown origin, (2) a simple and fast indicative QC test for end users, and (3) in-line product markers for feedback-controlled production."],["dc.identifier.doi","10.1515/hf-2014-0185"],["dc.identifier.isi","000360628700006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36171"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Walter De Gruyter Gmbh"],["dc.relation.issn","1437-434X"],["dc.relation.issn","0018-3830"],["dc.title","Quality control methods for thermally modified wood"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]