2017/03/01 by L. Y. Grunin, Leonid Grunin, Yu. B. Grunin +6
Engineering · Materials Science · #Advanced Cellulose Research Studies #Lignin and Wood Chemistry #Material Properties and Processing
paper · doi:10.1134/s0006350917020087
crossref issued 2017/03/01 · crossref published 2017/03/01 · crossref published-print 2017/03/01 · openalex publication_date 2017/03/01 · crossref created 2017/06/09 · crossref published-online 2017/06/11 · openalex created_date 2025/10/10 · crossref deposited 2026/03/16 · crossref indexed 2026/07/28 · openalex updated_date 2026/08/01
The goal of this paper is a systematic investigation of changes in the supramolecular structure of cellulose during its water uptake. The main attention is concentrated on the analysis of the mechanism of dispersion of microfibrils by proton NMR relaxation techniques. Spin diffusion NMR experiments made it possible to estimate the linear dimensions of the surface thickness of cellulose crystallites and the average depth of micropores that are formed between elementary fibrils, as well as the character of the filling of micropores during adsorption. It has been shown that when the relative water content gradually increases to 7–8%, water molecules occupy the space between cellulose microfibrils, which is accompanied by an increase in the pore sizes and their specific surface area and a simultaneous decrease in the degree of crystallinity. Upon acquiring a free induction decay signal, a magic sandwich echo sequence was used, due to which the accuracy and information value of the results were considerably improved.