Statistical theory of surface tension and molecular orientations in nematic liquid crystals. II: The nematic-isotropic interface
Statistical theory of surface tension and molecular orientations in nematic liquid crystals. II: The nematic-isotropic interface
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向列液晶表面张力和分子取向的统计理论。
DOI：
10.1143/jpsj.55.4186
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发表时间：
1986
影响因子：
1.7
通讯作者：
H. Nakano
中科院分区：
文献类型：
--
作者：
H. Kimura;H. Nakano
在平均场近似下，计算了棒状分子通过吸引和排斥相互作用的向列-各向同性（N-I）界面的表面张力。结果表明，排斥体积效应有利于分子在N-I界面处的平面取向，而在自由表面处排斥体积效应有利于分子的垂直取向.本文分析了4-正戊基-4 '-氰基联苯（5CB）和4-甲氧基苄叉-4'-丁基苯胺（MBBA）的实验行为。分子在N-I界面和自由表面的取向一致地解释为分子间排斥力和吸引力之间的平衡效应。
The surface tension of the nematic-isotropic ( N - I ) interface is calculated in a mean field approximation for the system of rod-like molecules interacting via attraction as well as hard-core repulsion. It is found that the excluded volume effect favors the planar orientation of molecules at the N - I interface in contrast with the case of the nematic free surface at which the effect favors the normal alignment. Experimental behavior of nematogens such as 4- n -pentyl-4'-cyanobiphenyl (5CB) and 4-methoxybenzylidene-4'-butylaniline (MBBA) are analysed. Orientations of a molecule at the N - I interface and at the nematic free surface are explained consistently as effects of a counterbalance between the repulsive and attractive intermolecular forces.