Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1986049 | International Journal of Biological Macromolecules | 2016 | 9 Pages |
Abstract
For lignocellulosic materials, water adsorption is extremely important for its product performance. For gaining a deeper understanding of moisture adsorption mechanisms, the molecular interactions between adsorbed water and a typical lignocellulosic material (i.e., wood) were studied using in-situ microscopic Fourier transform infrared (micro-FTIR) spectroscopy and a specially designed sample cell. The spectral shifts of 1733Â cmâ1, 1604Â cmâ1 and 1236Â cmâ1 and different spectra between the moist and dry spectra indicated that carbonyl CO and CO groups preferred to combine with water molecules to form hydrogen bonds. From component band analysis of the spectral range of 2900-3700Â cmâ1, three peaks at 3178Â cmâ1, 3514Â cmâ1 and 3602Â cmâ1 were identified and assigned to strongly, moderately and weakly hydrogen-bonded water molecules, respectively. According to the variation trend of these hydrogen-bonded water molecules, three sections were divided for the adsorption process. Furthermore, the molecular structure of water absorbed by hydrophilic groups of wood in each section was demonstrated.
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Authors
Xin Guo, Yan Qing, Yiqiang Wu, Qinglin Wu,