Interactions, Dynamics and Phase Transitions of Charge-Stabilized Colloidal Suspensions

电荷稳定胶体悬浮液的相互作用、动力学和相变

• 批准号: 9730189
• 负责人: David Grier
• 金额: $ 28.5万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9730189&HistoricalAwards=false
• 关键词: Interactions; Dynamics; Phase; Transitions; Charge

9730189 Grier This continuation proposal by Prof. David G. Grier of the James Franck Institute of the University of Chicago describes a research program to study the microscopic origins of bulk properties in charge-stabilized colloidal suspensions. The experimental methods to be employed for these studies will include the use of a combination of optical trapping techniques in conjunction with high- resolution digital video microscopy. There are two thrusts. The primary thrust involves a systematic study of how the pairwise interaction potential depends on key control parameters already identified in previous work by the PI. This will involve the use of the "blinking optical tweezer" technique developed by the PI for measuring colloidal pair potentials. This comprehensive study will provide a basis for reformulating the theory of colloidal interactions. A valid theory of colloidal interactions is of major importance not only for colloid science in general but also for the critical role it plays in applied, industrial problems, such as the stability of suspensions. The second thrust centers on the phase transitions in mono-disperse charge-stabilized suspensions. Previous studies of colloidal phase behavior have taken as their starting point the basic understanding that like-charged spheres repel each other. However, systems whose pair potentials are characterized by attractive tails are predicted to undergo structural phase transitions not available to purely repulsive systems. Studies of the phase transitions of such systems are crucial to the understanding of the structure and dynamics of colloids. %%% This continuation proposal by Prof. David G. Grier of the James Franck Institute of the University of Chicago describes a research program to study the microscopic origins of bulk properties in charge-stabilized colloidal suspensions. The experimental methods to be employed for these studies will include the use of a combination of optical trapping techniques in conjunction with high- resolution digital video microscopy. There are two thrusts. The primary thrust involves a systematic study of how the pairwise interaction potential depends on key control parameters already identified in previous work by the PI. This will involve the use of the "blinking optical tweezer" technique developed by the PI for measuring colloidal pair potentials. This comprehensive study will provide a basis for reformulating the theory of colloidal interactions. A valid theory of colloidal interactions is of major importance not only for colloid science in general but also for the critical role it plays in applied, industrial problems, such as the stability of suspensions. The second thrust centers on the phase transitions in mono-disperse charge-stabilized suspensions. Previous studies of colloidal phase behavior have taken as their starting point the basic understanding that like-charged spheres repel each other. However, systems whose pair potentials are characterized by attractive tails are predicted to undergo structural phase transitions not available to purely repulsive systems. Studies of the phase transitions of such systems are crucial to the understanding of the structure and dynamics of colloids. ***

小行星9730189 本论文是由大卫G.詹姆斯的格里尔 弗兰克大学研究所 芝加哥描述了一个研究计划，以研究电荷稳定的胶体悬浮液中的整体性质的微观起源。 用于这些研究的实验方法将包括使用光学捕获技术与 高分辨率数字视频显微镜。 有两个推力。 主要的推力涉及一个系统的研究如何成对相互作用势取决于关键 PI在先前工作中已经确定的控制参数。 这将涉及使用PI开发的“闪烁光镊”技术来测量胶体对电位。 这项全面的研究将为重新制定胶体相互作用理论提供基础。 有效的 胶体相互作用理论是 的 它不仅对胶体科学具有重要意义，而且对它在应用、工业问题（如悬浮液的稳定性）中所起的关键作用也具有重要意义。 第二个推力集中在单分散电荷稳定悬浮液的相变。以前对胶体相行为的研究都是以同电荷球体相互排斥这一基本认识为出发点的。 然而，系统的对潜力的特点是吸引性的尾巴预测进行结构相变不提供给纯粹的排斥系统。 研究这类体系的相变对于理解胶体的结构和动力学是至关重要的。 本续篇由大卫教授G.詹姆斯的格里尔 弗兰克大学研究所 芝加哥描述了一个研究计划，以研究电荷稳定的胶体悬浮液中的整体性质的微观起源。 用于这些研究的实验方法将包括使用光学捕获技术与 高分辨率数字视频显微镜。 有两个推力。 主要的推力涉及一个系统的研究如何成对相互作用势取决于关键 PI在先前工作中已经确定的控制参数。 这将涉及使用PI开发的“闪烁光镊”技术来测量胶体对电位。 这项全面的研究将为重新制定胶体相互作用理论提供基础。 有效的 胶体相互作用理论是 的 它不仅对胶体科学具有重要意义，而且对它在应用、工业问题（如悬浮液的稳定性）中所起的关键作用也具有重要意义。 第二个推力集中在单分散电荷稳定悬浮液的相变。以前对胶体相行为的研究都是以同电荷球体相互排斥这一基本认识为出发点的。 然而，系统的对潜力的特点是吸引性的尾巴预测进行结构相变不提供给纯粹的排斥系统。 研究这类体系的相变对于理解胶体的结构和动力学是至关重要的。 ***