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Fast Analog Electrooptic Liquid Crystal Materials

快速模拟电光液晶材料

基本信息

批准号：
EP/H046941/1
负责人：
Mikhail Osipov
金额：
$ 21.62万
依托单位：
University of Strathclyde
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2010
资助国家：
英国
起止时间：
2010 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FH046941%2F1
关键词：
Fast Analog Electrooptic Liquid Crystal

项目摘要

A joint program of research in chiral/polar liquid crystals showing fast analog electrooptics is proposed between experimental and computer simulation group at the University of Colorado, Boulder, experimental groups at Chalmers University of Technology, Sweden, the University of Stuttgart, Germany and Queen's University, Canada, and the theoretical group at the University of Strathclyde, UK. While various combinations of the partners have been collaborating separately over the past several years, all with joint publications, the proposed Network will create a uniquely powerful team for forefront research on chiral liquid crystals. The proposal is focused into synthesis, characterization and theoretical modelling of novel smectic liquid crystal materials, which will have a number of advantages over the existing materials including much faster switching, lower energy consumption and a broader range of applications in electrooptic and all optical devices. A number of exotic chiral smectic liquid crystal materials will be investigated including the V-shaped switching ferroelectric smectics with the most rapid analog liquid crystal electro-optic effects; the deVries materials which tilt without layer contraction in the Smectic C* phase, the closely related orthoconic high-tilt antiferroelectrics; and the recently discovered family of bent-core liquid crystals with a polar smectic A phase that give phase-only electrooptic modulation The de Vries type smectic materials are characterized by anomalously weak layer contraction which enables one to avoid buckling of smectic layers at the tilting transition leading to the formation of the so-called zig-zag defects which seriously degrade the optical quality of smectic materials.. All of these smectic materials will be studied experimentally using polarized microscopy, polarization and tilt angle measurements, x-ray scattering technique and refractometry, and new materials with advanced characteristics will be synthesized using guidance from experiment, molecular theory and atomistic computer simulations. The proposed research highlights fundamental studies of the relationships of the properties of these novel liquid crystal systems with ramifications for a variety of areas in soft materials science. The corresponding materials development will enable a variety of novelapplications, including holographic data storage and projection, beam steering, and chirality detection. The theoretical part of the whole proposal (Work package Strathclyde) is focused into the development of the advance molecular theory of de Vries type ferroelectric materials, taking into account short-range orientational and positional intermolecular correlations, and interpretation of the experimental results obtained by other teams. Using the results of experimental studies and computer simulations, molecular models of analog de Vries smectic materials with nano-segregating groups will be developed, order parameters of these materials will be calculated numerically and compared with experimental data. Effect of various molecular model parameters on the value and temperature variation of the spontaneous polarization in de Vries type materials will be investigated including the effects of molecular shape and flexibility, dipole distribution and nano-segregating groups.

在手性/极性液晶显示快速模拟电光的联合计划的研究提出了实验和计算机模拟组之间的科罗拉多大学，博尔德，实验组在查尔默斯科技大学，瑞典，斯图加特大学，德国和加拿大皇后大学，和理论组在斯特拉斯克莱德大学，英国。虽然在过去几年中，合作伙伴的各种组合一直在单独合作，但都有联合出版物，拟议的网络将为手性液晶的前沿研究创建一个独特而强大的团队。该提案的重点是新型近晶液晶材料的合成，表征和理论建模，与现有材料相比，该材料具有许多优点，包括更快的开关，更低的能耗以及在电光和所有光学器件中更广泛的应用。我们将研究一些奇异的手性近晶液晶材料，包括具有最快的模拟液晶电光效应的V形开关铁电近晶材料，在近晶C * 相中倾斜而没有层收缩的DeVries材料，密切相关的正锥高倾斜反铁电材料;以及最近发现的具有极性近晶A相的双核液晶家族，de弗里斯型近晶材料的特征在于非常弱的层收缩，这使得人们能够避免近晶层在倾斜转变处的屈曲，导致形成严重降低近晶材料的光学质量的所谓之字形缺陷。所有这些近晶材料将使用偏振显微镜，偏振和倾斜角测量，x射线散射技术和折射率进行实验研究，并将使用实验，分子理论和原子计算机模拟的指导合成具有先进特性的新材料。拟议的研究突出了这些新型液晶系统的性质与软材料科学各个领域的分支之间关系的基础研究。相应的材料开发将使各种新颖的应用，包括全息数据存储和投影，光束转向和手性检测。整个提案的理论部分（工作包Strathclyde）的重点是发展de弗里斯型铁电材料的先进分子理论，考虑到短程取向和位置分子间的相关性，并解释其他团队获得的实验结果。利用实验研究和计算机模拟的结果，将建立具有纳米偏析基团的模拟de弗里斯近晶材料的分子模型，数值计算这些材料的序参数，并与实验数据进行比较。研究了各种分子模型参数对de弗里斯型材料中自发极化值和温度变化的影响，包括分子形状和柔性、偶极分布和纳米偏析基团的影响。