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

机译：向列型液晶中介电和金属球的非线性电泳

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摘要

Electrophoresis is a motion of charged dispersed particles relative to a fluid in a uniform electric field. The effect is widely used to separate macromolecules, to assemble colloidal structures and to transport particles in nano- and microfluidic devices and displays2"4. Typically, the fluid is isotropic (for example, water) and the electro-phoretic velocity is linearly proportional to the electric field. In linear electrophoresis, only a direct-current (d.c.) field can drive the particles. An alternating-current (a.c.) field is more desirable because it makes it possible to overcome problems such as electrolysis and the absence of steady flows5'6. Here we show that when the electrophoresis is performed in a liquid-crystalline nematic fluid, the effect becomes strongly nonlinear, with a velocity component that is quadratic in the applied voltage and has a direction that generally differs from the direction of linear velocity. The new phenomenon is caused by distortions of the liquid-crystal orientation around the particle that break the fore-aft (or left-right) symmetry. The effect makes it possible to transport both charged and neutral particles, even when the particles themselves are perfectly symmetric (spherical), thus allowing new approaches in display technologies, colloidal assembly and separation, microfluidic and micromotor applications.
机译：电泳是带电的分散粒子在均匀电场中相对于流体的运动。该效应被广泛用于分离大分子，组装胶体结构并在纳米和微流体装置和显示器中运送颗粒2“ 4。通常，流体是各向同性的（例如水），并且电泳速度与在线性电泳中，只有直流（dc）场可以驱动粒子，更希望使用交流（ac）场，因为它可以克服诸如电解和没有稳定流的问题5 '6.在这里，我们表明，当在液晶向列液中进行电泳时，该效应变为强非线性，其速度分量在施加电压上呈二次方，并且方向通常不同于线性速度方向。这种新现象是由于粒子周围液晶取向的扭曲破坏了前后（或左右）对称性所致。即使粒子本身完全对称（球形），也可以传输带电粒子和中性粒子，因此允许在显示技术，胶体组装和分离，微流体和微电机应用中采用新方法。

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  • 来源
    《Nature》 |2010年第7318期|P.947-950ⅲ|共5页
  • 作者

    Oleg D. Lavrentovich; Israel Lazo; Oleg P. Pishnyak;

  • 作者单位

    Liquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242, USA;

    rnLiquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242, USA;

    rnLiquid Crystal Institute and Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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