CAREER: Fluid Dynamics of Microscopic Defects in Layered Liquids

建议编号：CTS-0547432 PRINCIPAL调查员：雪莱·安纳斯蒂：卡内基梅隆大学职业生涯：层状液体中微观缺陷的流体动力学微观缺陷在层状液体中普遍存在，例如近晶液晶和浓缩表面活性剂溶液。缺陷在决定层状液体的流动行为中起着主导作用；事实上，流动和缺陷是强耦合的，当剪切样品时，往往会形成更多的缺陷。因此，缺陷的存在影响了广泛的工业应用，包括利用层状材料的有序性的新型应用的开发，例如光电子器件和显示器，以及用于包裹药物的生物材料的加工，以及涂料、粘合剂、药品和食品的配方和加工。在这些应用中优化配方和工艺条件的中心问题是，无论是理论还是实验都没有足够的发展来定量描述流动缺陷附近的流体动力学或缺陷与流动的相互作用。这个项目旨在通过开发工具来从实验和理论上对理想化的缺陷进行建模，从而弥合这一差距。该研究计划的中心思想是改变流动装置的长度尺度，以加强对缺陷组织的控制。预期的结果包括：使用几何形状和表面锚定来调整平衡缺陷阵列结构的能力；开发组织观察到的缺陷微观结构的实验相图作为初始缺陷配置、流动强度和时间的函数；通过定标和分析将实验与现有的理论模型进行比较；最后，将这项工作扩展到其他层状液体的初步研究。教育计划的中心目标是激励学生学习工程学，并通过开发基于组件的学习工具来帮助他们培养对热流体概念的物理直觉，这些学习工具围绕一个与工业相关的中央工程硬件示例(如喷墨打印)整合了几项互动学习活动。这种方法为学生提供了几个学习基本概念的视角，并使他们接触到新兴技术。基于组成部分的模块将在教育水平和学科中实施，并将针对K-12外联活动进行简化，旨在鼓励未被充分代表的群体参与工程和科学。

PROPOSAL NO.: CTS-0547432PRINCIPAL INVESTIGATORS: SHELLEY ANNAINSTITUTION: CARNEGIE MELLON UNIVERSITY CAREER: FLUID DYNAMICS OF MICROSCOPIC DEFECTS IN LAYERED LIQUIDS Microscopic defects are ubiquitous in layered liquids such as smectic liquid crystals and concentrated surfactant solutions. Defects play a leading role in determining the flow behavior of layered liquids; indeed flows and defects are strongly coupled and more defects often form when a sample is sheared. The presence of defects therefore impacts a wide variety of industrial applications including the development of novel applications exploiting the ordered nature of lamellar materials, such as optoelectronic devices and displays, as well as processing of biomaterials to encapsulate drugs, and formulation and processing of coatings, adhesives, pharmaceuticals, and food products. The central problem in optimizing formulation and processing conditions for these applications is that neither theory nor experiment are adequately developed to quantitatively describe the fluid dynamics near flowing defects or the interaction of defects with flows. This project aims to bridge this gap by developing tools to model idealized defects both experimentally and theoretically. The central idea of the research plan is to change the length scale of flow devices in order to enhance control over the defect microstructures. The expected outcomes include the ability to tune the equilibrium defect array structure using geometry and surface anchoring, the development of an experimental phase diagram organizing observed defect microstructures as a function of initial defect configuration, flow strength, and time; comparison of experiments with available theoretical models through scaling and analytics; and finally, a preliminary study extending this work to other layered liquids. The central aim of the education plan is to motivate students to study engineering and help them to develop physical intuition for thermal-fluids concepts through the development of component-based learning instruments, which integrate several interactive learning activities around a central, industrially-relevant example of engineering hardware, e.g. inkjet printing. This approach offers students several perspectives from which to learn fundamental concepts, and it exposes them to emerging technologies. The component-based modules will be implemented across education levels and disciplines, and they will be simplified for K-12 outreach activities targeted toward encouraging participation of underrepresented groups in engineering and science.Co-funded by the EHR Research on Learning and Education Program.