CAREER: Dynamics of Confined Colloidal Suspensions

职业：受限胶体悬浮液动力学

• 批准号: 0348175
• 负责人: Jerzy Blawzdziewicz
• 金额: --
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-04-01 至 2010-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0348175&HistoricalAwards=false
• 关键词: CAREER; Dynamics; Confined; Colloidal; Suspensions

AbstractCTS-0348175J. Blawzdziewicz, Yale UniversityThe central goal of my career-development plan is to establish a strong complex-fluids research program focused on macroscopic and particle-scale dynamical phenomena. Due to its technological importance (discussed below) and development of new experimental techniques (optical tweezers, scanning confocal microscopy) the dynamics of complex fluids is a rapidly growing field. The research conducted in my group will be primarily theoretical and computational. However, I plan to have close collaborations with experimental groups; two such collaborations have already been established for some of my projects. My research program is well integrated with the overall needs of the Yale Mechanical Engineering Department which aims at expanding its program in colloids and complex fluids. Broader Impact The objective of my research project is to provide fundamental understanding of the dynamics of colloidal suspensions in confined geometries. This project provides a basis for advanced technological applications of colloidal systems, e.g., using colloidal crystals to producephotonic frequency-gap materials, designing new particle-fractionation methods for microfluidic devices, and development of efficient micro-filtration techniques. My career-development plan has also a significant educational component. Through research in my group and the courses I will teach, my graduate and undergraduate students will learn about physical phenomena that are crucial in emerging technologies. I also plan to reach high-school students through a series of lectures in a Frontiers of Science and Technology program at Yale.Intellectual Merit My goal is to describe the role of hydrodynamic interactions and structural forces in colloidal suspensions bounded by confining walls or fluid interfaces. The interplay of the hydrodynamic and structural phenomena (e.g., particle ordering) is particularly pronounced when the smallest dimension associated with the confinement geometry (e.g., film thickness) is comparable to the particle size. I propose investigations of nonequilibrium hydrodynamic and structural confinement effects in the following colloidal systems:Particles adsorbed at a fluid interface Such particles are often used to stabilize or destabilize emulsions and foams. Our aim is to provide a macroscopic description for the dynamics of a monolayer of adsorbed particles and to evaluate the corresponding macroscopic transport coefficients in terms of the structural evolution on the particle scale.Particle-stabilized thin liquid films Our goal is to develop a nonequilibrium-thermodynamicsformalism for description of the process of the stepwise thinning of such films. The microscopic mechanisms of the effective thermodynamic forces and the corresponding transport phenomena will be investigated, and quantitative results for the transport coefficients will be obtained.Colloidal suspensions in slit pores We will study the dynamics of colloidal particles confined in pores and microfluidic channels of the width comparable to the particle diameter. We will explore the coupling of the microscopic suspension structure with the macroscopic lateral motion. A theory for suspension dynamics in pores with varying width will be developed.Particle deposition on a planar wall We will investigate the effect of many-particle hydrodynamic interactions on the structure of colloidal crystals produced by particle deposition on uniform and chemically patterned walls. The removal of adsorbed particles from a surface by an applied flow will also be studied.My project involves numerical and theoretical components. To perform the proposed numerical investigations we will develop fast Stokesian-dynamics algorithms for colloidal suspensions confined in spaces bounded by planar or nearly-planar surfaces. The applicability of our proposed theoretical and numerical methods will go beyond the research problems outlined above. In future studies we will use these methods to study interactions between particle clusters, filtration processes, thermocapillary phenomena, and bacterial motions. The proposed project will also provide a preliminary basis for launching a new research program for molecular fluids adsorbed in micropores.

摘要CTS-0348175 J。Blawzdziewicz，耶鲁大学我职业发展计划的中心目标是建立一个强大的复杂流体研究计划，专注于宏观和粒子尺度的动力学现象。由于其技术的重要性（下文讨论）和新的实验技术（光镊，扫描共聚焦显微镜）的发展，复杂流体的动力学是一个快速增长的领域。在我的小组进行的研究将主要是理论和计算。然而，我计划与实验小组进行密切合作;我的一些项目已经建立了两个这样的合作。我的研究项目与耶鲁大学机械工程系的总体需求很好地结合在一起，该系旨在扩展其在胶体和复杂流体方面的项目。更广泛的影响我的研究项目的目标是提供胶体悬浮液在有限的几何形状的动力学的基本理解。该项目为胶体系统的先进技术应用提供了基础，例如，利用胶体晶体生产光子频率间隙材料，为微流体装置设计新的颗粒分级方法，以及开发有效的微过滤技术。我的职业发展计划也有一个重要的教育部分。通过在我的团队中的研究和我将教授的课程，我的研究生和本科生将学习在新兴技术中至关重要的物理现象。我还计划通过在耶鲁大学的科学与技术前沿项目中的一系列讲座来接触高中生。智力优势我的目标是描述流体动力学相互作用和结构力在由限制壁或流体界面限制的胶体悬浮液中的作用。流体动力学和结构现象的相互作用（例如，粒子排序）在与限制几何形状相关联的最小尺寸（例如，膜厚度）与粒度相当。我建议调查的非平衡流体动力学和结构限制在以下胶体系统的影响：颗粒吸附在流体界面，这种颗粒通常用于稳定或不稳定的乳液和泡沫。我们的目的是提供一个宏观描述的动态单层的吸附粒子和评估相应的宏观输运系数在粒子尺度上的结构演变。粒子稳定的薄液膜我们的目标是开发一个非平衡-apericsformalism描述的过程中逐步变薄的这种膜。有效的热力学力和相应的运输现象的微观机制将进行调查，并将获得定量结果的运输系数。胶体悬浮液在狭缝孔我们将研究胶体颗粒的动力学限制在孔隙和微流体通道的宽度可比的颗粒直径。我们将探讨微观悬浮结构与宏观横向运动的耦合。悬浮动力学的理论在不同宽度的孔将开发。颗粒沉积在一个平面的墙壁上我们将研究的影响，多个粒子的流体动力学相互作用的结构上的胶体晶体颗粒沉积在均匀和化学图案的墙壁。此外，本课程亦将研究应用流体从表面移除吸附粒子的问题，包括数值与理论两部分。为了进行拟议的数值研究，我们将开发快速斯托克斯动力学算法的胶体悬浮液限制在平面或近平面的表面所界定的空间。我们提出的理论和数值方法的适用性将超越上述研究问题。在未来的研究中，我们将使用这些方法来研究粒子簇，过滤过程，热毛细现象和细菌运动之间的相互作用。该项目还将为开展微孔吸附分子流体的新研究计划提供初步基础。