期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 413, 期 -, 页码 298-302出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2012.04.023
关键词
Emulsions; Bijels; Two-phase flow; Phase field modeling; Coarsening; Yield stress
A continuum model is used to study thermodynamical stability of surfactant-based and solid-stabilized emulsions. Both modeling approaches are based on a phase-field description. In the case of solid particles along the fluid-fluid interface a local approximation to a classical dynamic density functional theory is used to account for particle-particle interactions. This allows for attractive as well as repulsive interactions. Coarsening studies are performed, which demonstrate thermodynamic stability for both cases. For surfactant-based emulsions this is achieved by a drastic reduction of surface tension, whereas for solid-stabilized emulsions the same effect results from an elastic force. Both types of emulsions behave different if a macroscopic force is applied. This is demonstrated by a rigid body interacting with the emulsion. The surfactant-based emulsion behaves like a fluid, whereas the solid-stabilized emulsion shows properties of a solid with a finite elastic modulus and a yield stress. (C) 2012 Elsevier B.V. All rights reserved.
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