Nonlinear electrophoresis of dielectric and metal spheres in a nematic liquid crystal

Oleg D. Lavrentovich (), Israel Lazo and Oleg P. Pishnyak
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Oleg D. Lavrentovich: Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University
Israel Lazo: Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University
Oleg P. Pishnyak: Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University

Nature, 2010, vol. 467, issue 7318, 947-950

Abstract: Liquid-crystal electrophoresis Electrophoresis is a motion of charged dispersed particles relative to a fluid in a uniform electric field. It is widely used as a means of separation, often with water (an isotropic fluid) as the carrier medium in a direct-current field. Lavrentovich et al. now describe a variant of the technique — liquid-crystal electrophoresis — that may find application in new display technologies, novel separations, micromotors and elsewhere. The method uses an anisotropic fluid as the carrier — a nematic liquid crystal — which allows motion of both charged and uncharged particles of perfect symmetry in either alternating- or direct-current fields. Use of an alternating-current field should offer practical advantages in some applications. This new type of electrophoresis is caused by a distortion in the orientation of the liquid crystals around the particles, rather than an effect on the particles themselves.

Date: 2010
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DOI: 10.1038/nature09427

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