Excluded Volume and Electrostatic Interactions in Liquid Crystals

9971143 Samulski该项目将通过精心构建的实验和实验结果的相关建模来表征和量化液晶中的分子间力。 其目的是简单而现实地描述取向和构象的偏见在中间相操作，使分子结构可以定制放大desireable性能。 实验的目的是分离取向有序成其主要组成部分-空间和静电相互作用-使预测的液晶性能。 核磁共振将用于研究溶质-液晶溶剂对;基于杂环噻吩和恶二唑环的新液体结构的合成和评价将被描绘出来，以突出静电相互作用在非线性“香蕉”或“回飞镖形”介晶中的作用。 这些材料的近晶相可能表现出新的电光特性，这种新的液晶可以用来检验铁电液晶中自发极化起源的“固有极性”模型。了解新型液晶的分子结构特征的性质，将能够合理设计新的液晶基元，这些液晶基元可以针对特定应用进行优化，例如高对比度、快速切换和高自发偏振，这些应用可用于改善包括平板显示器在内的一系列设备。

9971143SamulskiThis project will characterize and quantifiy intermolecular forces in liquid crystals through carefully constructed experiments and associated modeling of the experimental findings. The aim is to simply and realistically describe the orientational and conformational biases operative in mesophases so that molecular architectures can be tailored to amplify desireable properties. Experiments are designed to separate orientational ordering into its primary components - steric and electrostatic interactions - to enable the prediction of properties of liquid crystals. Nuclear magnetic resonance will be used to study solute-liquid crystal solvent pairs; the synthesis and evaluation of new liquid structures based on heterocyclic thiophene and oxadiazole rings will be delineated to highlight the role of electrostatic interactions in nonlinear "banana-" or "boomerang-shaped" mesogens. New electro-optic properties may be exhibited by smectic phases of these materials, and the new liquid crystals may be used to test the "indigenous polarity" model of the origins of spontaneous polarization in ferroelectric liquid crystals.%%%Understanding the properties of new classes of liquid crystals in terms of their molecular structural features will enable the rational design of new maesogens that can be optimized for specific applications such as high contrast ratios, rapid switching, and high spontaneous polarization useful for improving a range of devices that include flat-panel displays.