期刊
JOURNAL OF APPLIED CRYSTALLOGRAPHY
卷 44, 期 -, 页码 184-192出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0021889810043955
关键词
crystallinity; cellulose; transmission fibre geometry; quantitative phase analysis; Rietveld modelling
资金
- LNLS/MCT
- LNBio/MCT [GAR-6969]
- FAPESP [2010/05523-3]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [10/05523-3] Funding Source: FAPESP
This work defines the crystallinity of cellulose I materials on a dry-weight basis. Theoretical and experimental developments in X-ray diffraction lead to a crystallinity determination method that is estimated to reach 1 Sigma accuracies of better than 0.05 (crystallinity defined between 0 and 1). The method is based on Rietveld modelling, to resolve cellulose I Bragg peaks, and a standard truncated invariant integral. Corrections are derived to account for incoherent scattering, moisture content and other compositional deviations from pure cellulose. The experimental development uses X-ray diffraction in transmission fibre geometry with two-dimensional pattern Rietveld modelling, including a crystal-orientation distribution function. The crystallinities of a few commercial cellulose I materials were determined with the aim of illustrating the applicability of the method.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据