Phase separation transition in liquids and polymers induced by electric field gradients

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Marcus, G.
Tsori, Y.
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Abstract
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Spatially uniform electric fields have been used to induce instabilities in liquids and polymers, and to orient and deform ordered phases of block-copolymers. Here we discuss the demixing phase transition occurring in liquid mixtures when they are subject to spatially nonuniform fields. Above the critical value of potential, a phase-separation transition occurs, and two coexisting phases appear separated by a sharp interface. Analytical and numerical composition profiles are given, and the interface location as a function of charge or voltage is found. The possible influence of demixing on the stability of suspensions and on inter-colloid interaction is discussed.
Comment: 7 pages, 3 figures. Special issue of the J. Phys. Soc. Jap
Keywords
Condensed Matter - Statistical Mechanics, Condensed Matter - Soft Condensed Matter
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