Liquid crystals with patterned molecular orientation as an electrolytic active medium.
Liquid crystals with patterned molecular orientation as an electrolytic active medium.
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具有图案化分子取向的液晶作为电解活性介质。
DOI：
10.1103/physreve.92.052502
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
O. Lavrentovich
中科院分区：
文献类型：
--
作者：
C. Peng;Yubing Guo;C. Conklin;J. Viñals;S. Shiyanovskii;Q. Wei;O. Lavrentovich
微尺度流体和颗粒的传输是基础科学和应用科学的一个重要主题。最成功的方法之一是使用电场，这要求系统携带或感应电荷。我们描述了一种通过使用具有表面图案分子取向的液晶（LC）作为电解质来产生动电流的通用方法。表面图案是通过光对准产生的。在存在电场的情况下，空间变化的方向会产生空间电荷，从而触发液晶的流动。活性图案化液晶电解质将电能转化为液晶流，并沿着预先设计的轨迹传输任何类型（流体、固体、气体）的嵌入颗粒，对这些颗粒和界面的电性质（电荷、极化率）没有限制。图案化的液晶电解质表现出流速的二次场依赖性；它会产生可控旋转速度和方向的持续涡流，这对于微米级和纳米级混合应用来说是典型的。
Transport of fluids and particles at the microscale is an important theme in both fundamental and applied science. One of the most successful approaches is to use an electric field, which requires the system to carry or induce electric charges. We describe a versatile approach to generate electrokinetic flows by using a liquid crystal (LC) with surface-patterned molecular orientation as an electrolyte. The surface patterning is produced by photoalignment. In the presence of an electric field, the spatially varying orientation induces space charges that trigger flows of the LC. The active patterned LC electrolyte converts the electric energy into the LC flows and transport of embedded particles of any type (fluid, solid, gaseous) along a predesigned trajectory, posing no limitation on the electric nature (charge, polarizability) of these particles and interfaces. The patterned LC electrolyte exhibits a quadratic field dependence of the flow velocities; it induces persistent vortices of controllable rotation speed and direction that are quintessential for micro- and nanoscale mixing applications.
影响因子：
1.9
作者：
Shribak, M;Oldenbourg, R
通讯作者：
Oldenbourg, R