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

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

2009-01-14

arxiv.org/abs/0901.1990v1

J. Phys. Soc. Jap. Vol 78, 041010 (2009).

Physics

Condensed Matter

Statistical Mechanics

7 pages, 3 figures. Special issue of the J. Phys. Soc. Jap

Scientific paper

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.

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