An improved X-ray diffraction method for cellulose crystallinity measurement. (5th June 2015)

• Record Type: Journal Article
• Authors: Ju, Xiaohui; Bowden, Mark; Brown, Elvie E.; Zhang, Xiao
• Is Part Of: Carbohydrate polymers. Volume 123(2015)
• Page Start: 476
• Page End: 481
• Publication Date: 2015-06-05
• Subjects: Crystallinity index -- Nanocrystalline cellulose -- X-ray diffraction -- Cellulose crystallite -- Cellulose polymorphs; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2014.12.071
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: We show an improved X-ray diffraction method for cellulose crystallinity measurement. We found 2 θ range from 10 to 75° is more reliable to quantify cellulose crystallinity index. The new method may be applicable to cellulose of different polymorphs and origins. Abstract: We show in this work a modified X-ray diffraction method to determine cellulose crystallinity index (CrI). 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 (0 0 1) plane. In contrast to most previous methods, three distinct amorphous peaks identified from new model samples which used to calculate CrI. A 2 theta range from 10° to 75° was found to be more suitable to determine CrI and crystallite structural parameters such as d -spacing and crystallite size. This method enables a more reliable measurement of CrI of cellulose and may be applicable to other types of cellulose polymorphs.