Colloidal Dynamics in Fluids with Spatiotemporally Modulated Nematic Order
具有时空调制向列序的流体中的胶体动力学
基本信息
- 批准号:1610875
- 负责人:
- 金额:$ 48.88万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2016
- 资助国家:美国
- 起止时间:2016-07-01 至 2020-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Non-technical abstractLiquid crystals are fluids composed of rod-shaped molecules. The molecules arrange themselves to be more ordered than in an ordinary liquid but less so than in a crystalline solid. Nematic liquid crystal are an important example of this. The molecules in nematics all orient along a common direction. Impurities, like small particles, can disrupt this order and introduce important new effects. These can include important new optical and magnetic properties that potentially enable new technologies. The behavior becomes even richer when the order in the fluid is spatially patterned or changes with time. This project will investigate experimentally several classes of spatially or temporally varying nematic liquid crystals. They include 'active' nematics that undergo internally driven perpetual flow and that are seeded with magnetic particles and nematics with a striped pattern of ordering that should cause particles to sort themselves spontaneously by size. Among the broader impacts of the project will be research training and education for graduate and undergraduate students. The project will also enable a partnership with a local majority-minority magnet science high school to provide talented Baltimore City students with opportunities for research internships.Technical AbstractThe study of inclusions suspended in liquid crystals can lead to important new insight about the viscoelastic and interfacial properties of these materials and can further create novel platforms for manipulation of colloids through unique anisotropic interactions engendered by the fluids. Further, particle-dispersed liquid crystals hold technological promise as composite materials with enhanced properties deriving from coupling of the particles to the liquid crystalline order. This work will seek to advance substantially the understanding of the nature of dynamics in liquid crystalline materials and how the dynamics relates to colloidal transport. The particular goal will be to interrogate fluids with nematic order that are driven from equilibrium, either by internally generated flows in the case of active nematics or by externally imposed electric or stress fields, and to investigate how the spatiotemporal response to this driving couples to the particle motion. The research will focus on three thematically linked projects: (i) active nematic films containing magnetically actuated nano- and micro-particles that will provide new insights into the viscoelastic and hydrodynamic properties of active matter on key intrinsic lengthscales and timescales; (ii) colloidal dynamics in patterned and dynamically modulated liquid crystals configured to test striking predictions for colloidal transport in such environments; and (iii) nanoparticle dynamics in fluids with shear-induced nematic order, where new x-ray scattering techniques can enable novel microscopic perspectives on the structural dynamics of such out-of-equilibrium, driven systems. Broader impacts of the work will include research training for graduate and undergraduate students in physics that will prepare them for careers in academia and industry. The project will also enable a partnership with a local majority-minority magnet science high school to provide talented Baltimore City students with opportunities for research internships.
非技术摘要液晶是由棒状分子组成的流体。 分子排列的有序性比普通液体中的要好,但比晶体固体中的要差。 向列液晶是这方面一个重要例子。 向列相中的分子都沿沿着一个共同的方向取向。 杂质,如小颗粒,可以破坏这种秩序,并引入重要的新效应。 这些特性包括重要的新光学和磁性特性,可能使新技术成为可能。 当流体中的顺序在空间上形成图案或随时间变化时,行为变得更加丰富。 本计画将以实验方式研究数种随时间或空间变化之液晶。它们包括“活跃”的向列相,这些向列相经历内部驱动的永恒流动,并被磁性粒子和具有条纹有序模式的向列相所播种,这种有序模式应该会导致粒子自发地按大小进行排序。 该项目的更广泛影响将包括研究生和本科生的研究培训和教育。该项目还将促成与当地多数人的伙伴关系-少数民族磁铁科学高中,为有才华的巴尔的摩市的学生提供研究实习的机会。技术摘要悬浮在液晶中的夹杂物的研究可以导致重要的新见解有关的粘弹性和界面性质的这些材料,并可以进一步创造新的平台,通过独特的各向异性相互作用产生的操纵胶体液体。此外,颗粒分散液晶具有作为复合材料的技术前景,该复合材料具有源自颗粒与液晶有序的耦合的增强的性质。这项工作将寻求大幅推进液晶材料的动力学性质的理解,以及动力学如何与胶体运输。特定的目标将是询问流体与驱动从平衡,无论是由内部产生的流动的情况下,积极向列型或外部施加的电场或应力场,并调查如何时空响应这种驱动耦合到粒子运动。该研究将侧重于三个主题相关的项目:㈠含有磁驱动纳米和微米颗粒的活性纳米薄膜,这将为活性物质在关键内在长度尺度和时间尺度上的粘弹性和流体动力学特性提供新的见解; ㈡图案化和动态调制液晶中的胶体动力学,以测试对这种环境中胶体运输的惊人预测;和(iii)在流体中的纳米粒子动力学与剪切诱导的有序,其中新的X射线散射技术可以使新的微观视角上的结构动力学的这种平衡,驱动系统。这项工作的更广泛影响将包括为物理学研究生和本科生提供研究培训,为他们在学术界和工业界的职业生涯做好准备。该项目还将与当地一所少数民族磁铁科学高中建立伙伴关系,为有才华的巴尔的摩市学生提供研究实习机会。
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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Robert Leheny其他文献
Robert Leheny的其他文献
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{{ truncateString('Robert Leheny', 18)}}的其他基金
Dynamic coupling to the order and flows in active nematics and living liquid crystals
动态耦合到活性向列相和活性液晶中的有序和流动
- 批准号:
2104747 - 财政年份:2021
- 资助金额:
$ 48.88万 - 项目类别:
Continuing Grant
Uncovering the microscopic origins of nonlinear rheology in glassy nanocolloidal suspensions
揭示玻璃状纳米胶体悬浮液中非线性流变学的微观起源
- 批准号:
1804721 - 财政年份:2018
- 资助金额:
$ 48.88万 - 项目类别:
Standard Grant
Connecting nanoscale structure and dynamics to rheology and flow of glassy nanocolloidal suspensions
将纳米级结构和动力学与玻璃状纳米胶体悬浮液的流变学和流动联系起来
- 批准号:
1336166 - 财政年份:2013
- 资助金额:
$ 48.88万 - 项目类别:
Standard Grant
Dynamics, Transport, and Ordering of Inclusions in Liquid Crystals
液晶中夹杂物的动力学、输运和有序化
- 批准号:
1207117 - 财政年份:2012
- 资助金额:
$ 48.88万 - 项目类别:
Continuing Grant
Colloidal Mobility in Surfactant Films and its Application of the Shear Rheology of Protein Layers
表面活性剂膜中的胶体迁移率及其在蛋白质层剪切流变学中的应用
- 批准号:
1033985 - 财政年份:2010
- 资助金额:
$ 48.88万 - 项目类别:
Standard Grant
Magnetic Probes of Elastic Energy, Dynamics, Interactions, and Shape Transitions of Anisotropic Colloids in Liquid Crystals
液晶中各向异性胶体的弹性能、动力学、相互作用和形状转变的磁探针
- 批准号:
0706021 - 财政年份:2008
- 资助金额:
$ 48.88万 - 项目类别:
Continuing Grant
Interfacial Microrheology of Protein Layers using Magnetic Nanowire Probes
使用磁性纳米线探针进行蛋白质层的界面微流变学
- 批准号:
0651666 - 财政年份:2007
- 资助金额:
$ 48.88万 - 项目类别:
Standard Grant
Acquisition of Particle Tracking Instrumentation for Soft Matter and Biomaterials Research and Education
采购用于软物质和生物材料研究和教育的粒子跟踪仪器
- 批准号:
0315493 - 财政年份:2003
- 资助金额:
$ 48.88万 - 项目类别:
Standard Grant
CAREER: Structure and Dynamics of Disordered and Out-of-Equilibrium Systems
职业:无序和非平衡系统的结构和动力学
- 批准号:
0134377 - 财政年份:2002
- 资助金额:
$ 48.88万 - 项目类别:
Continuing Grant
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