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Percolation and phase behavior in cellulose nanocrystal suspensions from nonlinear rheological analysis
Chalmers University of Technology, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.ORCID iD: 0000-0002-6877-7858
RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food.ORCID iD: 0009-0000-1671-4583
RISE Research Institutes of Sweden, Bioeconomy and Health, Agriculture and Food. Chalmers University of Technology, Sweden.ORCID iD: 0000-0003-0310-4465
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2023 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 308, article id 120622Article in journal (Refereed) Published
Abstract [en]

We examine the influence of surface charge on the percolation, gel-point and phase behavior of cellulose nanocrystal (CNC) suspensions in relation to their nonlinear rheological material response. Desulfation decreases CNC surface charge density which leads to an increase in attractive forces between CNCs. Therefore, by considering sulfated and desulfated CNC suspensions, we are comparing CNC systems that differ in their percolation and gel-point concentrations relative to their phase transition concentrations. The results show that independently of whether the gel-point (linear viscoelasticity, LVE) occurs at the biphasic - liquid crystalline transition (sulfated CNC) or at the isotropic - quasi-biphasic transition (desulfated CNC), the nonlinear behavior appears to mark the existence of a weakly percolated network at lower concentrations. Above this percolation threshold, nonlinear material parameters are sensitive to the phase and gelation behavior as determined in static (phase) and LVE conditions (gel-point). However, the change in material response in nonlinear conditions can occur at higher concentrations than identified through polarized optical microscopy, suggesting that the nonlinear deformations could distort the suspensions microstructure such that for example a liquid crystalline phase (static) suspension could show microstructural dynamics similar to a biphasic system.

Place, publisher, year, edition, pages
Elsevier Ltd , 2023. Vol. 308, article id 120622
Keywords [en]
Cellulose nanocrystal suspensions, Fourier-transform rheology, Percolation, Self-assembly phases, Stress decomposition, Cellulose, Cellulose derivatives, Gelation, Nanocrystals, Nonlinear optics, Solvents, Suspensions (fluids), Cellulose nanocrystal suspension, Gel phasis, Gel point, Linear viscoelasticity, Material response, Rheological analysis, Self-assembly phase, Stress decompositions, Self assembly, Behavior, Dispersions, Phase Transition
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-64094DOI: 10.1016/j.carbpol.2023.120622Scopus ID: 2-s2.0-85147603169OAI: oai:DiVA.org:ri-64094DiVA, id: diva2:1740167
Note

Correspondence Address: Abitbol T, RISE, Sweden;  Funding details: BASF; Funding details: Wallenberg Wood Science Center, WWSC; Funding text 1: SW and RK are grateful for the financial support of the Wallenberg Wood Science Centre (WWSC) and of the Chalmers Area of Advance Materials Science. The Chair of Sustainable Packaging within the Institute of Materials at EPFL, co-funded by BASF, Logitech, Nestlé and SIG, is acknowledged by TA. A.Ah, A.A. and M.S. are grateful for the financial support from KP Nanocellulose platform at RISE AB.; Funding text 2: SW and RK are grateful for the financial support of the Wallenberg Wood Science Centre (WWSC) and of the Chalmers Area of Advance Materials Science. The Chair of Sustainable Packaging within the Institute of Materials at EPFL, co-funded by BASF, Logitech, Nestlé and SIG, is acknowledged by TA. A.Ah, A.A. and M.S. are grateful for the financial support from KP Nanocellulose platform at RISE AB.

Available from: 2023-02-28 Created: 2023-02-28 Last updated: 2023-10-06Bibliographically approved

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Ahlinder, AstridAltskär, AnnikaStading, MatsAbitbol, Tiffany

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