微晶
结晶度
纤维素
背景(考古学)
衍射
材料科学
X射线
纳米结构
粉末衍射
X射线晶体学
复合材料
结晶学
化学工程
光学
化学
物理
纳米技术
古生物学
工程类
生物
作者
Christopher J. Garvey,Ian H Parker,George P. Simon
标识
DOI:10.1002/macp.200500008
摘要
Abstract Summary: The average lateral dimensions of cellulose microfibrils in paper sheets can be determined from the width of X‐ray Bragg peaks at half the maximum height. The method assumes it is the finite size of the crystallite which is the main contributor to peak broadening in the directions orthogonal to the long axis of the crystallite. This assumption is examined in the context of samples from different botanical sources, of varying crystallinity and cellulose content and the various instrumental sources of broadening X‐ray powder patterns. Excellent fits to the data from paper samples can be obtained by using five Voigt functions to the powder diffraction patterns, for the 101, $10\bar 1$ , 021, 002 and 040 reflections. Of these reflections, the 020 is the clearest, and the best able to determine the lateral dimension of the crystallite. Results indicate that the size of microfibrils is dependent on the botanical source of the fibres. magnified image
科研通智能强力驱动
Strongly Powered by AbleSci AI