Presidential Young Investigators Award: Mechanistic Studies of Colloidal Interactions

总统青年研究员奖：胶体相互作用的机理研究

• 批准号: 9058078
• 负责人: Stacy Bike
• 金额: $ 32.9万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-15 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9058078&HistoricalAwards=false
• 关键词: Presidential; Young; Investigators; Award; Mechanistic

The focus of this PYI-directed research program will be on colloidal particles and the focus associated with their transport. One force of fundamental interest is electrokinetic lift, which arises from the relative motion of charged bodies in electrolyte solutions. Electrokinetic lift is significant to all particle transport processes including hydrodynamic chromatography, deep-bed filtration, suspension rheology, and the detachment of particles from surfaces during fluid flow. Given the broad applicability of this force, it is essential that one assesses the importance of electrokinetic lift in a given system. Previous analyses of this force have focused on two bodies bearing thin, equilibrium double layers. Such simplified models, while easy to theoretically characterize, are not technologically relevant. For example, the analyses have shown that electrokinetic lift is more important in nonaqueous media, which are characterized by thick, nonequilibrium double layers. The PI will initiate an in- depth analysis of this force, removing first the equilibrium double-layer restriction and, second, the thin double-layer restriction. These theoretical studies will be coupled with experimental observation of lift. Later, transport studies will then be extended to focus on the role of colloidal forces in the rheology of dispersions with application to coatings and films. The results of this work will greatly enrich the fundamental understanding of the transport of colloidal particles.

这个由保华投资指导的研究项目的重点将是 胶体颗粒及其相关的焦点 运输 一种基本的力是电动升力， 它产生于带电体的相对运动 电解质溶液 电动升力对于 所有颗粒传输过程，包括流体动力学 色谱法，深床过滤，悬浮液流变学，和 在流体流动过程中颗粒从表面脱离。 鉴于这支部队的广泛适用性， 人们评估电动升力的重要性， 给定系统。 以前对这种力量的分析集中在 两个身体轴承薄，平衡双层。 等 简化的模型，虽然容易在理论上表征， 与技术无关。 例如，分析 已经表明电动升力在 非水介质，其特征在于厚， 非平衡双层 私家侦探会发起一个- 深入分析这种力量，首先消除平衡， 第二，薄双层 限制. 这些理论研究将与 电梯的实验观察 后来，交通研究 然后将扩展到专注于胶体力的作用 用于涂料的分散体流变学 和电影。 这项工作的成果将大大丰富 基本了解胶体的运输 粒子