Glassy Liquid Crystals for Reflective Coloration and Optical Storage
用于反射着色和光学存储的玻璃状液晶
基本信息
- 批准号:0204827
- 负责人:
- 金额:$ 31.77万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2002
- 资助国家:美国
- 起止时间:2002-06-01 至 2005-11-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Glasses are traditionally classified as amorphous materials having isotropic properties. As a class of noncrystalline solids, glassy liquid crystals are characterized by a uniaxial, lamellar, helical, or columnar molecular arrangement underlying liquid crystalline mesomorphism. Thanks to optical anisotropy and device robustness, glassy liquid crystals are well suited for optics, photonics, and optoelectronics. However, most liquid crystals tend to crystallize on cooling from melts, thereby losing the desired order and yielding grain boundaries that scatter light and limit charge transport. Under prior NSF support, a definitive set of materials has been generated following an empirical approach in which liquid crystalline groups are chemically bonded to a volume-excluding central core. Unique features of glassy liquid crystals include: a well-defined molecular structure with a low to medium molecular weight, superior chemical purity and film-forming ability, and favorable rheological properties that facilitate processing into large area monodomain thin films. In addition, feasibility has been demonstrated for latching electro-optic devices, such as optical switches, attenuators and tunable filters; efficient circular polarizers and polarized light emitters; and high-performance optical notch filters and reflectors. To take on new intellectual and technological challenges, the PI's propose to develop glassy nematics and cholesterics with a high glass transition temperature (80 to 150 C) and a wide mesomorphic fluid temperature range; to furnish molecular-level understanding of vitrification, as opposed to crystallization, of liquid crystals; to functionalize glassy liquid crystals with photoresponsive moieties that are thermallystable and fatigue resistant; and to demonstrate concepts for reversible tunability of reflective coloration and patterning as well as rewritable optical data storage. Glassy liquid crystals are particularly promising because of their ability to undergo repeated heating-cooling cycles across a wide temperature range (through the glass transition temperature) without encountering crystallization. The project involves implementation of deterministic synthesis strategies for multifunctional materials; preparation and characterization of ordered solid films; analysis of material stability against thermally activated crystallization; determination of crystalline lattice structures with x-ray crystallography and powder diffractometry; and reversible modulation of optical properties through photoinduced ring closure ring opening of diarylethene moieties. Aimed at cultivating new knowledge crucial to the development of novel optical materials, the proposed research is highly relevant to optical information technology that is undergoing a rapid growth worldwide. Transition of academic research to civilian and defense applications will be facilitated through collaboration and partnership with government and industry laboratories. From an educational perspective, students participating in the project will develop unique skills from conducting their thesis research in a multidisciplinary environment, gaining a broad perspective in a strategically important area of research and development.
玻璃传统上被分类为具有各向同性性质的无定形材料。玻璃态液晶是一类非晶态固体,其特征在于液晶介晶性下的单轴、层状、螺旋或柱状分子排列。由于光学各向异性和器件鲁棒性,玻璃态液晶非常适合用于光学、光子学和光电子学。然而,大多数液晶倾向于在从熔体冷却时结晶,从而失去所需的顺序并产生散射光并限制电荷传输的晶界。在先前的NSF支持下,根据经验方法已经产生了一组确定的材料,其中液晶基团化学键合到体积排除中心核。玻璃态液晶的独特特征包括:具有低至中等分子量的明确分子结构、上级化学纯度和成膜能力以及有利于加工成大面积单畴薄膜的良好流变性质。此外,已经证明了用于闩锁电光器件的可行性,例如光学开关、衰减器和可调谐滤波器;高效圆偏振器和偏振光发射器;以及高性能光学陷波滤波器和反射器。为了迎接新的智力和技术挑战,PI提出开发具有高玻璃化转变温度的玻璃态向列相和胆甾相化合物(80至150 ℃)和宽的介晶流体温度范围;提供对液晶的玻璃化(与结晶相对)的分子水平的理解;用热稳定和抗疲劳的光响应部分官能化玻璃状液晶;并演示反射着色和图案化的可逆可调谐性以及可编程光学数据存储的概念。玻璃态液晶是特别有前途的,因为它们能够在很宽的温度范围内(通过玻璃化转变温度)经历重复的加热-冷却循环而不会遇到结晶。该项目涉及实施多功能材料的确定性合成策略;有序固体薄膜的制备和表征;分析材料对热激活结晶的稳定性;用X射线晶体学和粉末衍射法确定晶格结构;通过二芳基乙烯部分的光致闭环和开环可逆调节光学性质。该研究旨在培养对新型光学材料开发至关重要的新知识,与全球正在快速发展的光学信息技术高度相关。将通过与政府和行业实验室的合作和伙伴关系,促进学术研究向民用和国防应用的过渡。从教育的角度来看,参加该项目的学生将在多学科环境中进行论文研究,从而培养独特的技能,在具有战略意义的研究和开发领域获得广阔的视野。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Shaw Chen其他文献
Collaborative multidisciplinary workshop report: clinical antimicrobial trials for primary and secondary prevention of atherosclerotic cardiovascular disease.
多学科协作研讨会报告:动脉粥样硬化性心血管疾病一级和二级预防的临床抗菌试验。
- DOI:
- 发表时间:
2000 - 期刊:
- 影响因子:6.4
- 作者:
Henry Rosen;J. Muhlestein;John Bartlett;Shaw Chen;Gary Chikami;Marshall Corson;P. K. Shah;Enrique Gurfinkel;Hunter Handsfield;Lisa Jackson;Charles Knirsch;R. Kronmal;J. Allen McCutchan;Steven Shea - 通讯作者:
Steven Shea
Shaw Chen的其他文献
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{{ truncateString('Shaw Chen', 18)}}的其他基金
Workshop: Fundamental Research Needs in Photonic Materials Synthesis and Processing at the Interface; Rochester, NY; April 28-30, 2003
研讨会:光子材料合成和界面处理的基础研究需求;
- 批准号:
0321839 - 财政年份:2003
- 资助金额:
$ 31.77万 - 项目类别:
Standard Grant
Vitrified Liquid Crystalline Films: Material Synthesis and Optical Properties
玻璃化液晶薄膜:材料合成和光学性能
- 批准号:
9818234 - 财政年份:1999
- 资助金额:
$ 31.77万 - 项目类别:
Continuing Grant
Engineering Research Equipment: Luminescence Spectrometer for Polarized Light Emission from Liquid Crystalline Glassy Films
工程研究设备:液晶玻璃薄膜偏振光发射光谱仪
- 批准号:
9811172 - 财政年份:1998
- 资助金额:
$ 31.77万 - 项目类别:
Standard Grant
Novel Molar Design Concept for Low Molar Mass Glass-Forming Liquid Crystals
低摩尔质量玻璃形成液晶的新颖摩尔设计概念
- 批准号:
9500737 - 财政年份:1996
- 资助金额:
$ 31.77万 - 项目类别:
Continuing Grant
ENGINEERING RESEARCH EQUIPMENT: Differential Scanning Calorimeter for Liquid Crystal Research
工程研究设备:用于液晶研究的差示扫描量热仪
- 批准号:
9411604 - 财政年份:1994
- 资助金额:
$ 31.77万 - 项目类别:
Standard Grant
Engineering Research Equipment Grant: Binary Tracer Diffusion in Near-Critical and Supercritical Dense Gases
工程研究设备资助:近临界和超临界致密气体中的二元示踪剂扩散
- 批准号:
8618176 - 财政年份:1987
- 资助金额:
$ 31.77万 - 项目类别:
Standard Grant
Expedited Award: Thermotropic Behavior and Novel Applications for Polymer Liquid Crystals
加急奖:聚合物液晶的热致行为和新颖应用
- 批准号:
8714924 - 财政年份:1987
- 资助金额:
$ 31.77万 - 项目类别:
Standard Grant
Research Equipment: Diffusion of Aromatic Hydrocarbons in Dense Fluids up to the Supercritical Region
研究设备:芳香烃在稠密流体中的扩散直至超临界区
- 批准号:
8500974 - 财政年份:1985
- 资助金额:
$ 31.77万 - 项目类别:
Standard Grant
Research Initiation: Temperature and Concentration Studies Of Binary Diffusion in Liquids: Equipment Supplement
研究启动:液体中二元扩散的温度和浓度研究:设备补充
- 批准号:
8305649 - 财政年份:1983
- 资助金额:
$ 31.77万 - 项目类别:
Standard Grant
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