Vibrational sum-frequency-generation (SFG) spectroscopy study of the structural assembly of cellulose microfibrils in reaction woods

被引：0
作者：
Kabindra Kafle
Rui Shi
Christopher M. Lee
Ashutosh Mittal
Yong Bum Park
Ying-Hsuan Sun
Sunkyu Park
Vincent Chiang
Seong H. Kim
机构：
[1] The Pennsylvania State University,Department of Chemical Engineering and Materials Research Institute
[2] North Carolina State University,Department of Forestry and Environmental Resources
[3] National Renewable Energy Laboratory,Department of Biology, 208 Mueller Laboratory
[4] The Pennsylvania State University,Department of Forestry
[5] National Chung Hsing University,Department of Forest Biomaterials
[6] North Carolina State University,undefined
来源：
Cellulose | 2014年 / 21卷
关键词：
Reaction wood; Tension wood; Compression wood; Cellulose microfibril assembly; Sum-frequency-generation spectroscopy; X-ray diffraction;
D O I：
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中图分类号：
学科分类号：
摘要：
The cellulose microfibril assemblies in secondary cell walls of tension wood and compression wood were studied with vibrational sum frequency generation (SFG) spectroscopy. The tension wood contains the gelatinous layer with highly-crystalline and highly-aligned cellulose microfibrils. The SFG spectral features of tension wood changed depending on the azimuth angle between the polarization of the incident IR beam and the preferential alignment axis of the cellulose microfibrils. The SFG spectra of the compression wood did not show any dependence on the azimuth angle, implying that the overall orientation of cellulose microfibrils in compression wood is not highly aligned. Instead, the decrease of cellulose content in compression wood brought about larger separation between cellulose microfibrils, which was manifested as changes in CH2/OH intensity ratio in SFG spectra. These results implied that SFG spectral features are sensitive to cellulose microfibril alignments and inter-fibrillar separations.
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页码：2219 / 2231
页数：12
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