RUI: Liquid Crystalline Zwitterionic Derivatives of closo-Boranes for Display Applications

RUI：用于显示应用的闭硼烷液晶两性离子衍生物

• 批准号: 1611250
• 负责人: Piotr Kaszynski
• 金额: $ 34万
• 依托单位: Middle Tennessee State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2021-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1611250&HistoricalAwards=false
• 关键词: RUI; Liquid; Crystalline; Zwitterionic; Derivatives

Non-technical AbstractWith the support of the Solid State and Materials Chemistry program, this research team will take a multi-disciplinary and international approach to materials chemistry that trains undergraduate students to synthesize and characterize liquid crystals (LCs) in the context of display applications (LCD). Liquid crystalline materials are liquids or soft wax-like substances in which molecules exhibit some degree of ordering and organization; they uniquely combine fluidity of liquids and molecular ordering found in solid crystals. If molecules forming such materials are polar (have a permanent dipole moment), they can undergo realignment in an electric field resulting in switching of optical properties of the material. Such an electro-optical effect is at the heart of modern liquid crystal display industry, which demands improvements in resolution and speed of switching between screen images. This, in turn, motivates the search for new LC materials, such as those investigated in this project. Thus, a team comprised of the principal investigator (PI), co-PI, an international technical expert and undergraduate co-workers design, synthesize and fully characterize new polar liquid crystals derived from boron clusters. Among the main goals of the project is the development of extensive structure-property relationships in this class of materials, preparation of materials for practical applications, and training of undergraduate students for careers in materials chemistry.Technical AbstractThis basic research project tests the hypothesis that rationally-designed zwitterionic derivatives of inorganic boron clusters, [closo-1-CB9H10]- and [closo-1-CB12H12]- anions, form liquid crystalline phases and are suitable materials for display applications. In this context, a series of zwitterions is synthesized and investigated for their spectroscopic, structural, thermal and dielectric properties using a broad selection of research tools. The experimental work is augmented with theoretical methods that allow the researchers to formulate a detailed understanding of structure-property relationships and to explain the observed results. The detailed multi-dimensional analysis of specific derivatives is expected to contribute to the understanding of the impact of the molecular structure on properties, materials performance, and to the fundamental chemistry and science of liquid crystals.

在固态和材料化学项目的支持下，这个研究团队将采取多学科和国际化的材料化学方法，培训本科生在显示应用(LCD)的背景下合成和表征液晶(LCS)。液晶材料是液体或软蜡状物质，其中的分子表现出一定程度的有序性和组织性；它们独特地结合了液体的流动性和固体晶体中的分子有序性。如果形成这种材料的分子是极性的(具有永久的偶极矩)，它们可以在电场中重新排列，从而导致材料的光学性质的切换。这种电光效应是现代液晶显示行业的核心，这要求提高屏幕图像之间的分辨率和切换速度。这反过来又促使人们寻找新的液晶材料，例如本项目中研究的那些材料。因此，一个由首席研究员(PI)、一名国际技术专家和本科生同事组成的团队设计、合成和全面表征了从硼簇合物中衍生的新的极性液晶。该项目的主要目标之一是发展这类材料的广泛结构-性质关系，为实际应用准备材料，以及培养材料化学专业的本科生。技术摘要这一基础研究项目检验了这样的假设，即合理设计的无机硼簇合物的两性离子衍生物[Closo-1-CB9H10]-和[Closo-1-CB12H12]-形成液晶相，是适合显示应用的材料。在此背景下，合成了一系列两性离子，并利用多种研究工具对其光谱、结构、热学和介电性质进行了研究。实验工作中增加了理论方法，使研究人员能够对结构-性质关系有一个详细的理解，并解释观察到的结果。对特定衍生物的详细多维分析有望有助于理解分子结构对性能、材料性能的影响，并有助于液晶的基础化学和科学。