U.S.-Hungary Materials Research: Liquid Crystalline Mesophases of Bent Core Molecules

美国-匈牙利材料研究：弯曲核心分子的液晶中间相

• 批准号: 0225963
• 负责人: Peter Palffy-Muhoray
• 金额: $ 2.98万
• 依托单位: Kent State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0225963&HistoricalAwards=false
• 关键词: U.S.; Hungary; Materials; Research; Liquid

This US-Hungarian research project headed by Peter Palffy-Muhoray of Kent State University and Agnes Burka of the Hungarian Institute for Solid State Physics and Optics Budapest examines a new class of liquid crystals consisting of bent-shaped molecules. These ester type bent core liquid crystals range from low molecular weight materials to elastomers. The collaborative research plan involves synthesis, characterization, and modeling of such bent-core, or banana-shaped, molecules. Junior researchers from Kent State University are part of the distinguished US-Hungarian team.To determine the mesophases and physical properties of bent-core liquid crystals, the research partners will employ three experimental techniques: 1)Mechanical studies of thin films including linear electro-mechanical and rheological measurements of banana liquid crystal systems, where the overall chirality is set by surface interactions. 2)Electrical measurements which include determination of the polarization and dielectric spectroscopy. 3)Optical observations consisting of polarizing and confocal microscopy as well as electro-optic measurements and laser spectroscopy. The goal is to resolve a number of fundamental questions concerning the correlation between material parameters and pattern forming instabilities. For example, the researchers hope to explain observed achiral symmetry-breaking mechanisms and to understand how the structures form helical filaments in an isotropic melt. If successful, their results may help identify novel synthetic materials with optical and pyroelectric properties that have practical applications in information technology and biotechnology. This research project in experimental condensed matter physics fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence.

这项由肯特州立大学的彼得·帕尔菲·穆罕默（Peter Palffy-Muhoray）和匈牙利固态物理和光学研究所的艾格尼丝·伯卡（Agnes Burka）领导的这项美国匈牙利研究项目研究了由弯曲形分子组成的新的液晶。 这些酯型弯曲的核心液晶从低分子量材料到弹性体。协作研究计划涉及这种弯曲核或香蕉形分子的合成，表征和建模。肯特州立大学的初级研究人员是杰出的美国匈牙利团队的一部分。为了确定弯曲核液晶的中间相和物理性能，研究伙伴将采用三种实验技术：1）薄膜的机械研究，包括线性电力力学和诸如蕉液液晶系统的线性电力力学和流变尺寸，在该灯泡液晶系统的整体聊天中都设置了表面互动。 2）电测量值，包括测定极化和介电光谱。 3）由偏振和共聚焦显微镜以及电形测量和激光光谱的光学观察结果。 目的是解决有关物质参数与模式形成不稳定性之间相关性的许多基本问题。 例如，研究人员希望解释观察到的Achiral对称性机制，并了解这些结构如何在各向同性熔体中形成螺旋细丝。 如果成功，他们的结果可能有助于鉴定具有光学和高电特性的新型合成材料，这些材料在信息技术和生物技术中具有实际应用。实验性凝结物理学的研究项目实现了通过使美国和中欧的专家能够结合互补才能并在具有强大的共同利益和能力领域的研究资源结合的计划中推进科学知识的计划。