An improved X-ray diffraction method for cellulose crystallinity measurement
An improved X-ray diffraction method for cellulose crystallinity measurement
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DOI：
10.1016/j.carbpol.2014.12.071
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发表时间：
2015-06-05
影响因子：
11.2
通讯作者：
Zhang, Xiao
中科院分区：
文献类型：
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作者：
Ju, Xiaohui;Bowden, Mark;Zhang, Xiao
在这项工作中，我们显示了一种改进的X-射线衍射方法来确定纤维素结晶度指数（Crl）。以漂白木浆为原料制备的纳米纤维素（NCC）为模型基材。应用Rietveld精修，考虑在（001）平面处的March-Dollase优选取向。与大多数以前的方法相比，从用于计算Crl的新模型样品中鉴定出三个不同的无定形峰。发现10度至75度的2 θ范围更适合确定Crl和微晶结构参数，例如d间距和微晶尺寸。该方法能够更可靠地测量纤维素的Crl，并且可以适用于其他类型的纤维素多晶型物。(C)2015爱思唯尔有限公司版权所有。
We show in this work a modified X-ray diffraction method to determine cellulose crystallinity index (Crl). Nanocrystalline cellulose (NCC) derived from bleached wood pulp was used as a model substrate. Rietveld refinement was applied with consideration of March-Dollase preferred orientation at the (001) plane. In contrast to most previous methods, three distinct amorphous peaks identified from new model samples which used to calculate Crl. A 2 theta range from 10 degrees to 75 degrees was found to be more suitable to determine Crl and crystallite structural parameters such as d-spacing and crystallite size. This method enables a more reliable measurement of Crl of cellulose and may be applicable to other types of cellulose polymorphs. (C) 2015 Elsevier Ltd. All rights reserved.