Impact of sonication on the rheological and colloidal properties of highly concentrated cellulose nanocrystal suspensions - Société des Historiens Médiévistes de l’Enseignement Supérieur Public
Article Dans Une Revue Cellulose Année : 2019

Impact of sonication on the rheological and colloidal properties of highly concentrated cellulose nanocrystal suspensions

Résumé

The effect of sonication on a highly concentrated commercial suspension of cellulose nanocrystals (CNCs) and the resulting rheological properties have been investigated. Rheology and structural analysis techniques (atomic force microscopy, small-angle X-ray scattering, transmission electron microscopy and dynamic light scattering) were used to characterize the CNC suspension before and after sonication as a function of concentration. The highly concentrated CNC suspension, which does not contain aggregates, as shown by AFM and TEM imaging, turns from a “gel” form into a “liquid” form after a sonication treatment. The self-organization properties of as-prepared and sonicated suspensions were compared by the determination of their phase diagrams and flow rheology was performed to understand the viscosity behavior as a function of concentration for both systems. Sonication induced a decrease of the inter-particular distance, a strong decrease of the viscosity and remarkable changes in the liquid crystalline behavior, while sonicated and non-sonicated suspensions were stable over time. These effects can be attributed to a decrease in the aspect ratio of the suspended particles, which varies from a high value before sonication due to the presence of elongated bundles to a lower value after sonication that promotes individualization
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Dates et versions

hal-02304811 , version 1 (05-09-2024)

Identifiants

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Erwan Gicquel, Julien Bras, Candice Rey, Jean-Luc Putaux, Frédéric Pignon, et al.. Impact of sonication on the rheological and colloidal properties of highly concentrated cellulose nanocrystal suspensions. Cellulose, 2019, 26 (13-14), pp.7619-7634. ⟨10.1007/s10570-019-02622-7⟩. ⟨hal-02304811⟩
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