Lee Bomi, Lee Jun-Seo, Yoon Hyun-Jin, Hong Seung-Ho, Song Jang-Kun
Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea.
Merck Performance Materials Ltd., Pyeongtaek 17956, Republic of Korea.
Phys Rev E. 2020 Jan;101(1-1):012704. doi: 10.1103/PhysRevE.101.012704.
Dielectrophoresis (DEP) in a medium with anisotropic dielectric susceptibility is very different from typical DEP in an isotropic medium: The direction of particle actuation can be switched depending on the direction of the susceptibility tensor of the medium. However, the understanding of switchable DEP (SDEP) in an anisotropic medium is still in its infant stage. Here, we investigate SDEP using heat-generated isotropic droplets in a nematic liquid crystal (LC) medium. We demonstrate that the location of the generation of isotropic droplets can be partially controlled by controlling the temperature gradient within the LC cell using dielectric loss. The SDEP actuation of isotropic droplets is also highly dependent on the location of the isotropic droplets. Using this method, we fabricated different array patterns of isotropic and nematic phase separations under different applied signals.
在具有各向异性介电常数的介质中的介电泳（DEP）与各向同性介质中的典型DEP有很大不同：粒子驱动方向可以根据介质的介电常数张量方向进行切换。然而，对各向异性介质中可切换DEP（SDEP）的理解仍处于起步阶段。在此，我们利用向列型液晶（LC）介质中热生成的各向同性液滴来研究SDEP。我们证明，通过使用介电损耗控制LC盒内的温度梯度，可以部分控制各向同性液滴的生成位置。各向同性液滴的SDEP驱动也高度依赖于各向同性液滴的位置。利用这种方法，我们在不同的施加信号下制造了各向同性和向列相分离的不同阵列图案。
