Chernyshuk S B, Tovkach O M, Lev B I
Institute of Physics, NAS Ukraine, Prospekt Nauki 46, Kyiv 03650, Ukraine.
Bogolyubov Institute for Theoretical Physics, NAS Ukraine, Metrologichna 14-b, Kyiv 03680, Ukraine.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Mar;89(3):032505. doi: 10.1103/PhysRevE.89.032505. Epub 2014 Mar 14.
We propose a simple theoretical model which explains the formation of dipolar two- (2D) and three-dimensional (3D) colloidal structures in nematic liquid crystals. The colloidal particles are treated as effective hard spheres interacting via their elastic dipole, quadrupole, and octopole moments. It is shown that the octopole moment plays an important role in the formation of 2D and 3D nematic colloidal crystals. We generalize this assumption to the case of an external electric field and theoretically explain a giant electrostriction effect in 3D crystals observed recently.
我们提出了一个简单的理论模型，该模型解释了向列型液晶中偶极二维（2D）和三维（3D）胶体结构的形成。胶体粒子被视为通过其弹性偶极、四极和八极矩相互作用的有效硬球。结果表明，八极矩在二维和三维向列型胶体晶体的形成中起着重要作用。我们将这一假设推广到外部电场的情况，并从理论上解释了最近在三维晶体中观察到的巨大电致伸缩效应。
