基于液晶引流效应的微流体驱动方式开发

Development of a New Micro-fluid Drive and Control Method Based on the Liquid Crystalline Backflow Effect

以开发全新微流体驱动与控制方式为目标,运用液晶弹性形变理论与Leslie-Ericksen理论,对两平行板内电场引起的液晶流动进行研究。理论计算中主要讨论了扭转角对流动剖面图的影响:扭转角对流动的空间特征量影响较大,对于时间特征量没有影响。实验中采用5 V低电压驱动,通过向液晶混入极少量微粒子观察流动的特性,结果与理论计算结果较吻合。

As a purpose of developing a new micro-fluid drive and control technology, transient behaviors of a nematic liquid crystal between two parallel plates were computed with parameter of twist angle. The Frank theory and Leslie-Ericksen theory were used. When the twist angle is O°, the induced flow is planar, and when the twist angle is not O°, the flow has an out of plane component. The twist angle has little effect on the time characteristics of the haekflow. The experimental results are in agreement with the calculation results.