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Phase transitions of cellulose nanocrystal suspensions from nonlinear oscillatory shear
Chalmers Univiversity of Technology, Gothenburg.
Malmö University, Faculty of Health and Society (HS), Department of Biomedical Science (BMV). Malmö University, Biofilms Research Center for Biointerfaces. Chalmers Univiversity of Technology, Gothenburg.
Chalmers Univiversity of Technology, Gothenburg.
Chalmers Univiversity of Technology, Gothenburg.
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2022 (English)In: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 29, p. 3655-3673Article in journal (Refereed) Published
Abstract [en]

Cellulose nanocrystals (CNCs) self-assemble in water suspensions into liquid crystalline assemblies. Here, we elucidate the microstructural changes associated with nonlinear deformations in (2-9 wt%) CNC suspensions through nonlinear rheological analysis, that was performed in parallel with coupled rheology-polarized light imaging. We show that nonlinear material parameters from Fourier-transform rheology and stress decomposition are sensitive to all CNC phases investigated, i.e. isotropic, biphasic and liquid crystalline. This is in contrast to steady shear and linear viscoelastic dynamic moduli where the three-region behavior and weak strain overshoot cannot distinguish between biphasic and liquid crystalline phases. Thus, the inter-cycle and intra-cycle nonlinear parameters investigated are a more sensitive approach to relate rheological measurements to CNC phase behavior.

Place, publisher, year, edition, pages
Springer, 2022. Vol. 29, p. 3655-3673
Keywords [en]
Cellulose nanocrystals (CNCs), CNC water suspensions, Self-assembly phases, Rheology, Birefringence, Fourier-transform rheology, Stress decomposition
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:mau:diva-50931DOI: 10.1007/s10570-022-04474-0ISI: 000761824100001Scopus ID: 2-s2.0-85125226843OAI: oai:DiVA.org:mau-50931DiVA, id: diva2:1649933
Available from: 2022-04-05 Created: 2022-04-05 Last updated: 2024-06-18Bibliographically approved

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Fazilati, Mina

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