Density functional theory for chiral nematic liquid crystals
Density functional theory for chiral nematic liquid crystals
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DOI：
10.1103/physreve.90.020503
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发表时间：
2014-08-27
影响因子：
2.4
通讯作者：
van Roij, R.
中科院分区：
文献类型：
--
作者：
Belli, S.;Dussi, S.;van Roij, R.
尽管手性液晶相是世纪前实验观察到的第一种液晶，但手性液晶态热力学稳定性的起源仍然不清楚。在这篇文章中，我们通过手性粒子平衡间距的密度泛函理论来解决这个问题。当应用到右手硬螺旋，我们的理论预测熵驱动的双相，这可以是右手或左手，不仅取决于粒子的形状，但也对热力学状态。我们解释的手征订购的起源之间的相互作用，局部的非线性对齐和排除体积之间的差异左手和右手粒子对。
Even though chiral nematic phases were the first liquid crystals experimentally observed more than a century ago, the origin of the thermodynamic stability of cholesteric states is still unclear. In this Rapid Communication we address the problem by means of a density functional theory for the equilibrium pitch of chiral particles. When applied to right-handed hard helices, our theory predicts an entropy-driven cholesteric phase, which can be either right or left handed, depending not only on the particle shape but also on the thermodynamic state. We explain the origin of the chiral ordering as an interplay between local nematic alignment and excluded-volume differences between left-and right-handed particle pairs.