Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose: cellulose I to cellulose II, tracing the structural changes under chemical treatment

Terahertz time-domain spectroscopy as a novel tool for crystallographic analysis in cellulose: cellulose I to cellulose II, tracing the structural changes under chemical treatment
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太赫兹时域光谱作为纤维素晶体分析的新工具:从纤维素 I 到纤维素 II,追踪化学处理下的结构变化

DOI:
10.1007/s10570-022-04493-x
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发表时间:
2022
期刊:
影响因子:
5.7
通讯作者:
Tetsuya Inagaki
Tetsuya Inagaki
中科院分区:
材料科学2区
文献类型:
--
作者:
Han Wang;Hiroki Kataoka;Satoru Tsuchikawa;Tetsuya Inagaki

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太赫兹时域光谱(THz-TDS)已经扩大了纤维素晶体学研究的可能性,因为太赫兹辐射检测到大多数分子间的振动,并响应晶格的声子。在这项研究中,我们跟踪的转变的纤维素晶格从纤维素I纤维素II的THz-TDS和X-射线粉末衍射。通过用不同浓度(0重量%-20重量%,以2重量%间隔)的NaOH处理纤维素I获得纤维素II。纤维素II的THz吸收系数光谱显示出三个特征峰(在1.32 THz、1.76 THz和2.77 THz)。用七阶傅里叶级数拟合了用20重量% NaOH处理的纤维素II和未经NaOH处理的纤维素I的THz吸收系数谱。因此,用其他浓度的NaOH处理的样品的THz吸收系数光谱可以被认为是纤维素I和纤维素II的这两个拟合曲线乘以不同系数的组合。该系数能较好地反映样品中纤维素I和纤维素II的相对含量。
Terahertz time-domain spectroscopy (THz-TDS) has expanded possibilities in cellulose crystallography research, as THz radiation detects most intermolecular vibrations and responds to the phonons of crystalline lattices. In this study, we traced the transformation of the cellulose crystalline lattice from cellulose I to cellulose II by THz-TDS and X-ray powder diffraction. Cellulose II was obtained by treating cellulose I with NaOH of different concentrations (0 wt%–20 wt%, at 2 wt% intervals). The THz absorption coefficient spectra of cellulose II showed three characteristic peaks (at 1.32 THz, 1.76 THz, and 2.77 THz). The THz absorption coefficient spectra of cellulose II treated with 20-wt% NaOH and cellulose I without NaOH treatment were fitted by a seventh-order Fourier series. Thus, the THz absorption coefficient spectra of samples treated with NaOH of other concentrations could be considered a combination of these two fitted profiles of cellulose I and cellulose II, multiplied by different coefficients. Furthermore, the coefficients could reflect the relative contents of cellulose I and cellulose II in the samples.
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DOI: --
发表时间: 2020
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期刊: Cellulose
影响因子: 5.7
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