Nematic caps on colloidal particles in a nematogenic liquid under an electric field
Nematic caps on colloidal particles in a nematogenic liquid under an electric field
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电场作用下向列液体中胶体颗粒上的向列帽
DOI：
10.1039/c5sm00088b
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发表时间：
2015
期刊：
影响因子：
3.4
通讯作者：
Takeaki Araki and Akira Onuki
中科院分区：
文献类型：
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作者：
Takayuki Uchida;Takeaki Araki and Akira Onuki
我们研究本地化的区域（帽）的球形胶体颗粒悬浮在致热液体中的各向同性相在散装通过求解泊松方程与取向相关的介电张量。这些帽出现和增长与增加施加的电场。我们假设正介电各向异性的致热液体和高介电常数的颗粒。然后，电场沿着场方向沿着在每个粒子的极点附近变得最强，从而导致电荷帽。这种帽形成对于垂面锚定连续发生，但在其他情况下是不连续的过渡。我们还讨论了如何在介电响应，双折射，和去偏振光散射中观察到的双折射帽。
We examine the localized nematic regions (caps) on spherical colloidal particles suspended in a nematogenic liquid in the isotropic phase in the bulk by solving the Poisson equation with an orientation-dependent dielectric tensor. These caps appear and grow with an increasing applied electric field. We assume positive dielectric anisotropy of the nematogenic liquid and a high dielectric constant of the particles. Then, the electric field becomes the strongest near the poles of each particle along the field direction, leading to nematic caps. This cap formation occurs continuously for homeotropic anchoring, but is a discontinuous transition otherwise. We also discuss how the nematic caps can be observed in dielectric response, birefringence, and depolarized light scattering.