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Dynamics of nonlinear electrophoretic motion of dielectric microparticles in nematic liquid crystal
Journal of Molecular Liquids ( IF 6 ) Pub Date : 2018-02-19 , DOI: 10.1016/j.molliq.2018.02.053
Fedor V. Podgornov , Anna V. Ryzhkova , Wolfgang Haase

The dynamics of dielectric microparticles motion in nematic liquid crystal cells with in-plane electrodes was investigated. It was found that the microparticles motion was driven by the Stokes drag and electrophoretic forces in the middle part of the electrodes gap. At low electric field strengths (E < 0.4 V/μm), the electrophoresis of microparticles is linear whereas for E > 0.4 V/μm it has nonlinear nature, due to the induced charges in electric double layers near the microparticles boundary (q~E2). Independently on the NLC alignment, this nonlinearity leads to the cubic dependence of the microparticles velocity on the electric field strength (v~E3). But, the value of nonlinear electrophoretic mobility (μ(3)) of microparticles is a function of the alignment and the parameters of NLC as well as the dielectric permittivity of the microparticles. Near the electrodes, the dielectrophoretic and the elastic trapping forces significantly influence the motion dynamics of microparticles.



中文翻译:

向列型液晶中介电微粒的非线性电泳运动动力学

研究了具有平面内电极的向列液晶盒中介电微粒运动的动力学。发现微粒运动是由电极间隙中间部分的斯托克斯阻力和电泳力驱动的。在低的电场强度(E <0.4 V /μm)时,微粒的电泳是线性的,而对于E> 0.4 [V /μm的具有非线性特性时,由于在双电层附近的微粒边界(感应电荷që 2)。独立地对NLC对准,这种非线性导致立方微粒速度的依赖于电场强度(vë 3)。但是,非线性电泳迁移率的值(μ3)微粒是NLC的排列和参数以及微粒的介电常数的函数。在电极附近,介电泳和弹性俘获力显着影响微粒的运动动力学。

更新日期:2018-02-19
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