Effect of alkaline treatment on cellulose supramolecular structure studied with combined confocal Raman spectroscopy and atomic force microscopy
Effect of alkaline treatment on cellulose supramolecular structure studied with combined confocal Raman spectroscopy and atomic force microscopy
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DOI：
10.1007/s10570-008-9259-8
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发表时间：
2009-04-01
期刊：
影响因子：
5.7
通讯作者：
Jaaskelainen, Anna-Stiina
中科院分区：
文献类型：
--
作者：
Eronen, Paula;Osterberg, Monika;Jaaskelainen, Anna-Stiina
这项工作的目的是研究与纤维素纤维与共聚焦拉曼和原子力显微镜（AFM）相关的形态和结构变化。在默默化过程中，碱会诱导多态性晶格从纤维素I到II的变化。这是通过用10、15和25％氢氧化钠水溶液处理的纤维素样品的共聚焦拉曼光谱观察到的。来自同一样品的AFM图像说明，纤维素II中的微纤维肿胀和更颗粒状的II中的AFM图像。在平面和深度方向上的拉曼光谱图像显示，整个细胞壁上的多态纤维素结构在整个细胞壁上都是均匀的，而小纤维方向在纤维细胞壁层之间变化。样品表面上的微纤维方向的变化通过从同一样品位置测量的AFM图像确认。
The aim of this work was to investigate the morphological and structural changes associated with mercerization of cellulose fibres with combined confocal Raman and atomic force microscopy (AFM). During mercerization the alkali induces a change in polymorphic lattice from cellulose I to II. This was observed by confocal Raman spectroscopy from cellulose samples treated with 10, 15 and 25% aqueous sodium hydroxide solution. AFM images from the same samples illustrated that microfibrils were swollen and more granular in cellulose II than in cellulose I. Raman spectral images in plane and depth directions showed that the polymorphous cellulose structure was uniform throughout the cell wall, whereas the microfibril orientation varied between fibre cell wall layers. The changes in microfibril orientation on the sample surfaces were confirmed by AFM images measured from the same sample position.