SGER: Microfluidics as a Platform to Study Confinement of Complex Fluid Microstructures at Intermediate Length Scales

SGER：微流体作为研究中等长度尺度复杂流体微结构约束的平台

• 批准号: 0527909
• 负责人: Shelley Anna
• 金额: $ 5万
• 依托单位: Carnegie-Mellon University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0527909&HistoricalAwards=false
• 关键词: SGER; Microfluidics; Platform; Study; Confinement

PROPOSAL NO.: CTS-0527909PRINCIPAL INVESTIGATORS: SHELLEY ANNAINSTITUTION: CARNEGIE MELLON UNIVERSITY SGER: MICROFLUIDICS AS A PLATFORM TO STUDY CONFINEMENT OF COMPLEX FLUIDMICROSTRUCTURES AT INTERMEDIATE LENGTH SCALESThis is an exploratory research program to investigate the structure of liquid crystalline materials when confined at intermediate length scales, well above the molecular length scale, but small enough to significantly impact the defect microstructure. Recent experimental studies suggest that medium range confinement in microfluidic channels with well-defined surface anchoring conditions can lead to the formation of ordered arrays of defects. This new method for generating controlled defect structures offers a unique opportunity for studying the hydrodynamics of smectic materials, and for exploiting the competition between confinement, surface anchoring, and flow to synthesize new materials. This work has the potential to profoundly impact the study of the dynamics of complex liquids, as it will enable quantitative observations of defect dynamics in systems with precisely defined initial conditions. The results of these studies have the potential to impact a very wide range of new and mature applications from displays to pharmaceuticals, as well as to advance a fundamental understanding of the fluid dynamics of self-organizing materials. Preliminary studies will focus on small molecule thermotropic liquid crystals, which exhibit phase changes with temperature and derive their structures solely from packing and anisotropic dispersion forces. The intellectual merit of this work is the coupling between the physics of liquid crystalline self-organization and the mechanics of flow in geometries with dimensions much larger than molecular dimensions, but small enough to strongly influence the defect microstructure. A detailed understanding of this coupling will lead to a greater understanding of the impact of dynamics on self-organizing materials. The broader impact of this work lies in the enhancement of science and engineering infrastructure through development of microfluidics tools for research and education. Modifying these tools for outreach activities will help bring fluid mechanics education to K-12 students and teachers, and the public.

建议没有。项目名称：cst -0527909项目负责人：谢莉·安机构：卡耐基梅隆大学SGER：微流体作为研究复杂流体微观结构中长度尺度约束的平台这是一个探索性研究项目，旨在研究液晶材料在中长度尺度下的结构，远高于分子长度尺度，但足够小，可以显著影响缺陷的微观结构。最近的实验研究表明，在具有明确的表面锚定条件的微流体通道中，中等范围的约束可以导致有序缺陷阵列的形成。这种生成受控缺陷结构的新方法为研究近晶材料的流体动力学，以及利用约束、表面锚定和流动之间的竞争来合成新材料提供了独特的机会。这项工作有可能对复杂液体动力学的研究产生深远的影响，因为它将使精确定义初始条件的系统中的缺陷动力学的定量观察成为可能。这些研究的结果有可能影响从显示器到制药的广泛的新的和成熟的应用，以及推进对自组织材料的流体动力学的基本理解。初步的研究将集中在小分子热致液晶上，这些液晶表现出随温度变化的相，其结构完全来自于填料和各向异性色散力。这项工作的智力价值在于液晶自组织的物理特性与几何流动力学之间的耦合，这些几何结构的尺寸远远大于分子尺寸，但足够小，可以强烈影响缺陷的微观结构。对这种耦合的详细理解将有助于更好地理解动力学对自组织材料的影响。这项工作的更广泛的影响在于通过开发用于研究和教育的微流体工具来增强科学和工程基础设施。修改这些工具用于推广活动将有助于将流体力学教育带给K-12学生和教师以及公众。