利用非线性振动光谱学揭示纤维素表面层结构

2019/02/27   下载量： 1 次

方案摘要

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应用领域 石油/化工
检测样本 其他
检测项目 理化分析
参考标准 无需

采用立陶宛Ekspla公司的由脉冲皮秒激光器PL2251-50和皮秒参量激光器PG401构成的振动和频光谱测量系统，对纤维素样品进行的测量分析揭示了纤维素表面层结构。

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Significant questions remain in respect to cellulose’s structure and polymorphs, particularly the cellulose surface layers and the bulk crystalline core as well as the conformational differences. Total Internal Reflection Sum Frequency Generation Vibrational Spectroscopy (TIR-SFG-VS) combined with conventional SFG-VS (non-TIR) enables selectively characterizing the molecular structures of surface layers and the crystalline core of cellulose, revealing their differences for the first time. From the SFG spectra in the C-H and O-H regions, we found that the surface layers of Avicel are essentially amorphous while the surface layers of Iβ cellulose are crystalline but with different structural and spectroscopic
signatures compared with its crystalline core. The differences between hydrogen bonding networks of cellulose surface and crystalline core were also shown by the SFG signal. The discovery here represents yet another instance of the importance of spectroscopic observations in transformative advances to understand the structure of the cellulosic biomass.

上一篇 在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位
下一篇 采用和频振动光谱（SFG）测量系统研究卤化物负离子对1-丁醇单层/水界面结构的影响

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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