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Inducing nematic ordering of cellulose nanofibers using osmotic dehydration

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Abstract

The formation of nematically-ordered cellulose nanofiber (CNF) suspensions with an order parameter fmax ≈ 0.8 is studied by polarized optical microscopy, small-angle X-ray scattering (SAXS), and rheological measurements as a function of CNF concentration. The wide range of CNF concentrations, from 0.5 wt% to 4.9 wt%, is obtained using osmotic dehydration. The rheological measurements show a strong entangled network over all the concentration range whereas SAXS measurements indicate that at concentrations >1.05 wt% the CNF suspension crosses an isotropic-anisotropic transition that is accompanied by a dramatic increase of the optical birefringence. The resulting nanostructures are modelled as mass fractal structures that converge into co-existing nematically-ordered regions and network-like regions where the correlation distances decrease with concentration. The use of rapid, upscalable osmotic dehydration is an effective method to increase the concentration of CNF suspensions while partly circumventing the gel/glass formation. The facile formation of highly ordered fibers can result in materials with interesting macroscopic properties.

Graphical abstract: Inducing nematic ordering of cellulose nanofibers using osmotic dehydration

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Publication details

The article was received on 10 Oct 2018, accepted on 27 Nov 2018 and first published on 29 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR08194H
Citation: Nanoscale, 2018, Advance Article
  • Open access: Creative Commons BY license
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    Inducing nematic ordering of cellulose nanofibers using osmotic dehydration

    V. Guccini, S. Yu, M. Agthe, K. Gordeyeva, Y. Trushkina, A. Fall, C. Schütz and G. Salazar-Alvarez, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR08194H

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