Journal
CELLULOSE
Volume 26, Issue 13-14, Pages 7619-7634Publisher
SPRINGER
DOI: 10.1007/s10570-019-02622-7
Keywords
Cellulose nanocrystals (CNCs); Rheology; Sonication; Self-organization; Aspect ratio
Funding
- PolyNat Carnot Institute (Investissements d'Avenir) [ANR-11-CARN-007-01]
- Region Rhone-Alpes (ERDF: European regional development fund)
- NSF [DMR-0520547]
- LabEx Tec21 (Investissements d'Avenir) [ANR-11-LABX-0033]
- Institut Carnot PolyNat (Investissements d'Avenir) [ANR-11-CARN-030-01]
- Glyco@Alps program (Initiative d'Excellence) [ANR-15-IDEX-02]
- Agence Nationale de la Recherche (ANR) [ANR-11-LABX-0033] Funding Source: Agence Nationale de la Recherche (ANR)
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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. [GRAPHICS] .
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