A rheological investigation of oil-in-water Pickering emulsions stabilized by cellulose nanocrystals

[Display omitted] High and medium internal phase Pickering emulsions stabilized with cellulose nanocrystals (CNCs) exhibited very different performance compared to their peers stabilized with a surfactant. In this paper, we ascribed the difference to the formation of hydrogen bonding and van der Waa...

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Bibliographic Details
Published in:Journal of colloid and interface science 2022-02, Vol.608 (Pt 3), p.2820-2829
Main Authors: Miao, Chuanwei, Mirvakili, Mehr-Negar, Hamad, Wadood Y.
Format: Article
Language:English
Subjects:
Cellulose
Cellulose nanocrystals
Emulsions
High internal phase emulsion
Medium internal phase emulsion
Nanoparticles
Oil-in-water
Pickering emulsion
Rheology
Water
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Summary:[Display omitted] High and medium internal phase Pickering emulsions stabilized with cellulose nanocrystals (CNCs) exhibited very different performance compared to their peers stabilized with a surfactant. In this paper, we ascribed the difference to the formation of hydrogen bonding and van der Waals interactions between the CNC nanoparticles on adjacent oil droplets. Rheological properties of CNC-stabilized oil-in-water medium internal phase emulsions (MIPEs, oil content = 65% v/v) and high internal phase emulsions (HIPEs, oil content = 80% v/v) were comprehensively characterized using both oscillatory and rotational tests. It was found that in the MIPEs, the van der Waals and hydrogen bonding interactions dominate the emulsion properties, whereas the compact structure of oil droplets plays a more important role in the HIPEs. CNC concentration in the aqueous phase also affects the emulsion properties, especially for the HIPEs, and the results can be correlated to the stabilization mechanisms we previously reported. The information from these tests provides a much-needed guidance for the practical application of CNC-stabilized emulsions.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2021.11.010