US-Ireland R&D Partnership: Structure-property relationships of new polar liquid crystalline phases through synthesis and characterization using a range of analytical techniques
美国-爱尔兰 R
基本信息
- 批准号:2211347
- 负责人:
- 金额:$ 51.19万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2022
- 资助国家:美国
- 起止时间:2022-07-01 至 2025-06-30
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Nontechnical Explanation:The well-known liquid crystal display is generally based on molecules that are rod-like and may be modeled as a pencil sharpened at both ends. In the past 10-15 years there has been significant scientific interest in liquid crystals formed from bent molecules, modeled as a hockey stick, which also coincide with their mirror image. The study of molecules with these two structural properties has led to the discovery of new liquid crystalline phases with unique properties that are largely unexplored. The purpose of this research is to chemically synthesize new molecules that have these structures and exhibit these new phases and then study their physical properties with the dual goals of better understanding the relationships between molecular structure and liquid crystal properties and facilitating future applications of these materials as photonic, energy storage, and switching devices. These goals are accomplished by the pooling of the complementary expertise of a synthetic chemist, a physicist, and an engineer, from Northern Ireland, the US, and the Republic of Ireland respectively. This provides students and post-doctoral fellows a unique multidisciplinary and multinational environment for scientific, professional, and cultural enrichment through collaboration, scientific residencies in other Principal Investigator’s laboratories and the acquisition of skills that are not obtainable by working in a single laboratory. Technical Description:Current liquid crystal technologies are almost exclusively based on rod-like (calamitic) molecules that form nematic, and/or smectic phases. However, over the past 10-15 years there has been great interest in non-chiral molecules that are not rod-like. This led to the discovery of new nematic phases and corresponding nematic-nematic phase transitions. These new phases are called the twist-bend, the splay-bend, the splay, and the ferro nematic. These phases and their phase transitions and physical properties are a largely unexplored frontier. Molecules of this geometry sometimes form polar smectic phases, and should such phases be found; they too will be studied. The goal of this research is to synthesize and study the physical properties of new liquid crystalline materials that form from “bent” molecules with the objective of better understanding and advancing the relationship between molecular structure, the resulting liquid crystalline phases, and the physical and chemical properties of the resulting polar nematic and smectic mesophases. This is achieved through systematic synthesis of new mesogens that form the desired phases from bent core, bimesogen, and twisted core moieties; determination of liquid crystal phases and their transition temperatures; use of electro-optical and complementary spectroscopic techniques (x-ray scattering, Raman scattering, infrared, birefringence, wideband dielectric spectroscopy, and second harmonic generation) to investigate the structure and physical properties of these phases. Finally, test cells with well oriented liquid crystal molecules will be fabricated. These will be used to investigate the effect of various (electric, magnetic, surface anchoring, and flow) fields to investigate applications of these phases as well as to facilitate measurements of physical properties.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
非技术解释:众所周知的液晶显示器通常是基于棒状的分子,可以被建模为两端都削尖的铅笔。在过去的10-15年里,人们对弯曲分子形成的液晶产生了重大的科学兴趣,这种液晶以曲棍球棒为模型,也与它们的镜像相吻合。对具有这两种结构性质的分子的研究导致了具有独特性质的新液晶相的发现,这在很大程度上是未知的。本研究的目的是化学合成具有这些结构和表现这些新相的新分子,然后研究它们的物理性质,从而更好地理解分子结构与液晶性质之间的关系,并促进这些材料在光子、能量存储和开关器件方面的未来应用。这些目标是通过汇集分别来自北爱尔兰、美国和爱尔兰共和国的合成化学家、物理学家和工程师的互补专业知识来实现的。这为学生和博士后提供了一个独特的多学科和多国环境,通过合作,在其他首席研究员的实验室进行科学驻留,并获得在单个实验室工作无法获得的技能,从而丰富科学,专业和文化。技术描述:目前的液晶技术几乎完全基于棒状(灾难性)分子,形成向列相和/或近晶相。然而,在过去的10-15年里,人们对非棒状的非手性分子产生了极大的兴趣。这导致了新的向列相和相应的向列-向列相变的发现。这些新相被称为扭弯、斜弯、斜向和铁向列。这些相及其相变和物理性质在很大程度上是一个未开发的前沿。这种几何形状的分子有时会形成极性同晶相,如果发现这种相;他们也将被研究。本研究的目的是合成和研究由“弯曲”分子形成的新型液晶材料的物理性质,以更好地理解和推进分子结构、所产生的液晶相以及所产生的极性向列相和近晶中间相的物理和化学性质之间的关系。这是通过系统合成新的中丝原来实现的,这些中丝原形成所需的相,来自弯曲的核心,双丝原和扭曲的核心部分;液晶相及其转变温度的测定;利用电光和互补光谱技术(x射线散射、拉曼散射、红外、双折射、宽带介电光谱和二次谐波产生)来研究这些相的结构和物理性质。最后,将制备具有良好取向液晶分子的测试细胞。这些将用于研究各种(电、磁、表面锚定和流)场的影响,以研究这些相的应用,并促进物理性质的测量。该奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
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Michael Fisch其他文献
THE UTILITY OF CARDIAC BIOMARKERS DURING ANTHRACYCLINE CHEMOTHERAPY FOR THE DETECTION OF CARDIAC EVENTS: COMPARISON LEFT VENTRICULAR EJECTION FRACTION
- DOI:
10.1016/s0735-1097(14)60790-7 - 发表时间:
2014-04-01 - 期刊:
- 影响因子:
- 作者:
Patrick Stevens;Darla Freehardt;Joel Estis;John Todd;Michael Fisch;Daniel Lenihan - 通讯作者:
Daniel Lenihan
Handbook of Advanced Cancer Care: Depression and anxiety
高级癌症护理手册:抑郁和焦虑
- DOI:
- 发表时间:
2003 - 期刊:
- 影响因子:0
- 作者:
Michael Fisch - 通讯作者:
Michael Fisch
Five commentaries on ‘Waves Dangerous, Domesticated and Diagnostic’ plus Stefan Helmreich’s response
- DOI:
10.1007/s40152-025-00401-8 - 发表时间:
2025-02-13 - 期刊:
- 影响因子:2.300
- 作者:
Darryl Colenbrander;Clemens Driessen;Michael Fisch;Jun Mizukawa;Philip Steinberg;Renzo Taddei;Stefan Helmreich - 通讯作者:
Stefan Helmreich
Phenomenology, Practical Ontologies and the Link Between Experience and Practices
现象学、实践本体论以及经验与实践之间的联系
- DOI:
- 发表时间:
2019 - 期刊:
- 影响因子:0
- 作者:
Michael Fisch - 通讯作者:
Michael Fisch
An International Pain Classification System: How Reliable Are the Assessments Across Different Raters? (315-C)
- DOI:
10.1016/j.jpainsymman.2010.10.056 - 发表时间:
2011-01-01 - 期刊:
- 影响因子:
- 作者:
Cheryl Nekolaichuk;Robin Fainsinger;Odette Spruyt;Lyle Galloway;Michael Fisch;Gina Kaye;John Hanson;Eduardo Bruera;Donna Zhukovsky;Willem Landman;Michaela Bercovitch;Peter Lawlor - 通讯作者:
Peter Lawlor
Michael Fisch的其他文献
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{{ truncateString('Michael Fisch', 18)}}的其他基金
Doctoral Dissertation Research: Assessing the Effects of Environmental Change in Disaster Mental Health
博士论文研究:评估环境变化对灾难心理健康的影响
- 批准号:
1658350 - 财政年份:2017
- 资助金额:
$ 51.19万 - 项目类别:
Standard Grant
Doctoral Dissertation Research: Infrastructural Design Challenges in Municipal Planning Efforts Aimed at Maximizing Energy Efficiency
博士论文研究:旨在最大限度提高能源效率的市政规划工作中的基础设施设计挑战
- 批准号:
1628580 - 财政年份:2016
- 资助金额:
$ 51.19万 - 项目类别:
Standard Grant
RUI: Studies of Surfactant-Surfactant and Surfactant-Alcohol Mixtures
RUI:表面活性剂-表面活性剂和表面活性剂-醇混合物的研究
- 批准号:
9727708 - 财政年份:1998
- 资助金额:
$ 51.19万 - 项目类别:
Continuing Grant
RUI: Studies of Strongly Interacting Self-Assembled Systems
RUI:强相互作用自组装系统的研究
- 批准号:
9321924 - 财政年份:1994
- 资助金额:
$ 51.19万 - 项目类别:
Continuing Grant
RUI: Light Scattering Studies of Zwitterionic Surfactant Solutions
RUI:两性离子表面活性剂溶液的光散射研究
- 批准号:
9007442 - 财政年份:1990
- 资助金额:
$ 51.19万 - 项目类别:
Continuing Grant
Instrumentation for an Undergraduate Materials Science Laboratory
本科生材料科学实验室仪器
- 批准号:
9052055 - 财政年份:1990
- 资助金额:
$ 51.19万 - 项目类别:
Standard Grant
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