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Local crystallinity in twisted cellulose nanofibers

DOI: 10.1021/acsnano.0c08295 DOI Help

Authors: Tom Willhammar (Stockholm University) , Kazuho Daicho (The University of Tokyo) , Duncan N. Johnstone (University of Cambridge) , Kayoko Kobayashi (The University of Tokyo) , Yingxin Liu (Stockholm University) , Paul A. Midgley (University of Cambridge) , Lennart Bergström (Stockholm University) , Tsuguyuki Saito (The University of Tokyo)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Nano

State: Published (Approved)
Published: January 2021
Diamond Proposal Number(s): 19130 , 20614

Abstract: 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.

Journal Keywords: cellulose; electron diffraction; TEM; diffraction; nanofiber; CNF

Subject Areas: Biology and Bio-materials

Diamond Offline Facilities: Electron Physical Sciences Imaging Centre (ePSIC)
Instruments: E02-JEM ARM 300CF