Dierking I, Biddulph G, Matthews K
School of Physics and Astronomy, University of Manchester, Schuster Building Oxford Road, Manchester M13 9PL, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Jan;73(1 Pt 1):011702. doi: 10.1103/PhysRevE.73.011702. Epub 2006 Jan 4.
Application of an electric field to microspheres, dispersed in a nematic liquid crystal host material, causes particle translation along the direction of the average long molecular liquid crystal axis, i.e., the director. We have determined the stability regime of linear particle displacement in the parameter space of electric field amplitude and frequency for various applied electric wave forms and demonstrate a linear relationship between microsphere velocity and applied electric field amplitude. For increasing frequency the particle velocity exhibits a maximum before motion slowly vanishes. Addition of a small amount of an ionic dopant is shown to largely increase the stability region of linear microsphere motion, with particle velocities increasing until saturation is observed for increasing ion dopant concentration. It is presumed that the particle velocity is related to the surface charges adsorbed on the dispersed particles. Also the dynamics of occasionally observed two- and three-particle clusters is discussed.
将电场施加于分散在向列型液晶主体材料中的微球，会导致粒子沿平均长分子液晶轴方向（即指向矢方向）移动。我们已经确定了在各种施加的电波形式下，电场幅度和频率参数空间中线性粒子位移的稳定区域，并证明了微球速度与施加的电场幅度之间存在线性关系。随着频率增加，粒子速度在运动缓慢消失之前会出现最大值。结果表明，添加少量离子掺杂剂会大大增加线性微球运动的稳定区域，随着离子掺杂剂浓度增加，粒子速度增加直至达到饱和。据推测，粒子速度与吸附在分散粒子上的表面电荷有关。此外，还讨论了偶尔观察到的两粒子和三粒子簇的动力学。
