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Steady-shear and viscoelastic properties of cellulose nanofibril-nanoclay dispersions
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Wallenberg Wood Science Center, Sweden.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Number of Authors: 3
2017 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 24, no 4, 1815-1824 p.Article in journal (Refereed) Published
Abstract [en]

We have investigated the steady-shear and viscoelastic properties of composite dispersions of cellulose nanofibrils (CNFs) with medium or high charge density and two different nanoclays, viz. rodlike sepiolite or plate-like bentonite. Aqueous dispersions of CNFs with medium charge density displayed significantly lower steady-state viscosity and storage modulus but higher gelation threshold compared with CNFs with high charge density. Dynamic light scattering (DLS) results showed that the apparent hydrodynamic radius of bentonite particles increased when CNFs were added, implying that CNFs adsorbed onto the amphoteric edges of the plate-like bentonite particles. The sepiolite network in CNF-sepiolite dispersions was relatively unaffected by addition of small amounts of CNFs, and DLS showed that the hydrodynamic radius of sepiolite did not change when CNFs were added. Addition of CNFs at concentrations above the gelation threshold resulted in drastic decrease of the steady-shear viscosity of the sepiolite dispersion, suggesting that the sepiolite network disintegrates and the rod-like clay particles are aligned also at low shear rate. The relative change in the rheological properties of the clay-based dispersions was always greater on addition of CNFs with high compared with medium charge density. This study provides insight into how the rheology of CNF-nanoclay dispersions depends on both the nanoclay morphology and the interactions between the nanoclay and nanocellulose particles, being of relevance to processing of nanocellulose-clay composites.

Place, publisher, year, edition, pages
2017. Vol. 24, no 4, 1815-1824 p.
Keyword [en]
Cellulose nanofibrils, Nanocellulose dispersions, Bentonite, Sepiolite, Viscoelasticity
National Category
Materials Engineering Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-142392DOI: 10.1007/s10570-017-1211-3ISI: 000396789100017OAI: oai:DiVA.org:su-142392DiVA: diva2:1092900
Available from: 2017-05-04 Created: 2017-05-04 Last updated: 2017-05-04Bibliographically approved

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Liu, YingxinGordeyeva, KorneliyaBergström, Lennart
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