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Wood Science and Technology

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18-05-2018 | Original

In situ micro-FTIR observation of molecular association of adsorbed water with heat-treated wood

Authors: Xin Guo, Yiqiang Wu, Ning Yan

Published in: Wood Science and Technology | Issue 4/2018

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Abstract

Heat modification is an effective method of reducing the hygroscopicity of wood. To gain a detailed understanding of water adsorption mechanism of heat-treated wood, the molecular interaction between the adsorbed water and heat-treated wood was studied via micro-FTIR spectroscopy. The micro-FTIR spectra of heat-treated wood exhibited a typical change in the chemical groups resulting from the heat treatment. In addition, the micro-FTIR spectra at different relative humidity levels confirmed the chemical sites at which the heat-treated wood adsorbed the water. A component band analysis of these difference spectra revealed three component peaks that were assigned to strongly, moderately, and weakly hydrogen-bonded water, respectively. Based on this variation of these three types of adsorbed water, the water adsorption process of heat-treated wood was divided into three different sections. Furthermore, the structure of the water adsorbed in these three sections was demonstrated. The results of this study provide a valuable insight into the state of water present in heat-treated wood.

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Title: In situ micro-FTIR observation of molecular association of adsorbed water with heat-treated wood
Authors: Xin Guo
Yiqiang Wu
Ning Yan
Publication date: 18-05-2018
Publisher: Springer Berlin Heidelberg
Published in: Wood Science and Technology / Issue 4/2018
Print ISSN: 0043-7719
Electronic ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-018-1020-3

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