Phase separations in mixtures of a liquid crystal and a nanocolloidal particle
Phase separations in mixtures of a liquid crystal and a nanocolloidal particle
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DOI：
10.1063/1.3266509
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发表时间：
2009-11-28
影响因子：
4.4
通讯作者：
Matsuyama, Akihiko
中科院分区：
文献类型：
--
作者：
Matsuyama, Akihiko
我们提出了一个平均场理论来描述液晶和纳米胶体粒子混合物中的相分离。通过考虑液晶的向列型、近晶型A的有序性和纳米粒子的晶型有序性，我们计算了温度-浓度平面上的相图。根据液晶和胶体表面之间的相互作用，我们预测了各种相分离，如近晶A-晶体相分离和近晶A-各向同性晶体三相点等。在双节曲线内，我们发现了新的不稳定和亚稳态区域，这在相序动力学中是重要的。我们还发现了分散在近晶A相和向列相中的纳米颗粒的结晶有序性。液晶有序和晶体有序之间的协同现象导致了各种相图的出现。
We present a mean field theory to describe phase separations in mixtures of a liquid crystal and a nanocolloidal particle. By taking into account a nematic, a smectic A ordering of the liquid crystal, and a crystalline ordering of the nanoparticle, we calculate the phase diagrams on the temperature-concentration plane. We predict various phase separations, such as a smectic A-crystal phase separation and a smectic A-isotropic-crystal triple point, etc., depending on the interactions between the liquid crystal and the colloidal surface. Inside binodal curves, we find new unstable and metastable regions, which are important in the phase ordering dynamics. We also find a crystalline ordering of the nanoparticles dispersed in a smectic A phase and a nematic phase. The cooperative phenomena between liquid-crystalline ordering and crystalline ordering induce a variety of phase diagrams.