Mean Field Theory of Binary Mixtures of Nematic Liquid Crystals
Mean Field Theory of Binary Mixtures of Nematic Liquid Crystals
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DOI：
10.1080/00268948508080847
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发表时间：
1985-05
影响因子：
0.7
通讯作者：
P. Palffy-Muhoray;J. D. Bruyn;D. Dunmur
中科院分区：
文献类型：
--
作者：
P. Palffy-Muhoray;J. D. Bruyn;D. Dunmur
本文用分子场理论确定了双相液晶二元混合物的温度-组成相图和组元序参数。一个旋转不变的形式的Maier-Saupe赝势一般化的两组分混合物的参数的理论的转变温度，数密度和各向同性的相互作用强度的纯组分的比例。诱导双轴性的可能性和外场的影响进行了讨论。该模型预测了丰富多样的相行为。对于不同的成分，共存的向列型各向同性和向列型双相预测与实验和硬颗粒理论。在一般情况下，两个组分的顺序参数不同，在一个给定的阶段，改变的迹象物种间的相互作用项的赝势的结果在一个双轴解决方案的外观。然而，这种双轴相被证明是不稳定的，并且在淬火时，预计…
Abstract Molecular field theory is used to determine the temperature-composition phase diagram and component order parameters of binary mixtures of nematic liquid crystals. A rotationally invariant form of the Maier-Saupe pseudopotential is generalised to two-component mixtures; the parameters of the theory are the ratios of transition temperatures, number densities and isotropic interaction strengths of the pure components. The possibility of induced biaxiality and the effects of an external field are discussed. The model predicts a rich variety of phase behaviour. For dissimilar constituents, coexisting nematic-isotropic and nematic-nematic phases are predicted in agreement with experiment and hard particle theories. In general, the order parameters of the two constituents differ in a given phase; changing the sign of the interspecies interaction term in the pseudopotential results in the appearance of a biaxial solution. This biaxial phase is shown to be unstable however, and, on quenching, is expected...