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Local Crystallinity in Twisted Cellulose Nanofibers

preprint
submitted on 10.07.2020 and posted on 16.07.2020 by Tom Willhammar, Kazuho Daicho, Duncan Johnstone, Kayoko Kobayashi, Yingxin Liu, Paul A. Midgley, Lennart Bergström, Tsuguyuki Saito
Cellulose is crystallized by plants and other organisms into fibrous nanocrystals. The mechanical properties of these nanofibers and the formation of helical superstructures with energy dissipating and adaptive optical properties depend on the ordering of polysaccharide chains within these nanocrystals, which is typically measured in bulk average. Direct measurement of the local polysaccharide chain arrangement has been elusive. In this study, we use the emerging technique of scanning electron diffraction to probe the packing of polysaccharide chains across cellulose nanofibers and to reveal local ordering of the chains in twisting sections of the nanofibers. We then use atomic force microscopy to shed light on the size dependence of the inherent driving force for cellulose nanofiber twisting. The direct measurement of crystalline twisted regions in cellulose nanofibers has important implications for understanding single cellulose fibril properties that influence the interactions between cellulose nanocrystals in dense assemblies. This understanding may enable cellulose extraction and separation processes to be tailored and optimized.

History

Email Address of Submitting Author

tom.willhammar@mmk.su.se

Institution

Stockholm University

Country

Sweden

ORCID For Submitting Author

0000-0001-6120-1218

Declaration of Conflict of Interest

No conflict

Exports