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Inducing nematic ordering of cellulose nanofibers using osmotic dehydration
Stockholm University, Sweden; Wallenberg Wood Science Center, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy. Stockholm University, Sweden; Wallenberg Wood Science Center, Sweden.ORCID iD: 0000-0002-9663-7705
Stockholm University, Sweden; University of Hamburg, Germany.
Stockholm University, Sweden.
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2018 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 10, no 48, p. 23157-23163Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2018. Vol. 10, no 48, p. 23157-23163
Keywords [en]
Cellulose, Nanocellulose, Nanofibers, Osmosis, Rheology, Suspensions (fluids), X ray scattering, Concentration ranges, Correlation distance, Entangled networks, Macroscopic properties, Optical birefringence, Osmotic dehydration, Polarized optical microscopy, Rheological measurements, Dehydration, Concentration, Dispersions, Formation, Increments
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:ri:diva-37274DOI: 10.1039/c8nr08194hScopus ID: 2-s2.0-85058438205OAI: oai:DiVA.org:ri-37274DiVA, id: diva2:1280760
Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-04-23Bibliographically approved

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