Experimental and Theoretical Investigations of Electrostatic Interactions and Ordering in Highly Charged Colloidal Assemblies

高电荷胶体组件中静电相互作用和有序化的实验和理论研究

• 批准号: 0848265
• 负责人: Sanford Asher
• 金额: $ 75万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0848265&HistoricalAwards=false
• 关键词: Experimental; Theoretical; Investigations; Electrostatic; Interactions

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)." The Analytical and Surface Chemistry (ASC) program of the Division of Chemistry supports the research program of Professor Sanford A. Asher and Professor Rob Coalson of the University of Pittsburgh. Prof. Asher's group is experimentally investigating and the Coalson group is theoretically investigating how electrostatic interactions determine the self assembly and structural ordering of Crystalline Colloidal Arrays (CCA) which form photonic crystal materials. The project will investigate the nature of electrostatic interactions in highly concentrated, low salt suspensions of highly charged, monodisperse colloidal particles. The experimental part of the project aims at unveiling the form of the fundamental electrostatic interactions by direct measurements of electrostatic interactions using Colloidal Probe Atomic Force Microscopy on concentrated, highly charged colloidal particle dispersions. This work examines the charge induced self-assembly of these particles into an fcc CCA array by monitoring light diffraction from the CCA. These experimental results will be rationalized by theoretical calculations that model colloidal particle interactions in high concentration, highly charged particle dispersions. This project will lead to a fundamental understanding of electrostatic interactions in strongly interacting colloids and macromolecules. These interactions are ubiquitous in biological and material systems. Moreover, an increased understanding will enable advances in nanoscience and nanotechnology, especially in the bottom-up fabrication of photonic crystal materials through charge induced self-assembly. The graduate students and postdoctoral researchers who work on this project will be trained to become innovative researchers and leaders in academic science, government research laboratories and in industry. Through this research project, Prof. Asher and Prof. Coalson will provide research training for undergraduate students as well as enrichment opportunities for students of all levels in the greater Pittsburgh community.

“该奖项的资金来源是《2009 年美国复苏和再投资法案》（公法 111-5）。”化学系的分析与表面化学（ASC）项目支持匹兹堡大学Sanford A. Asher教授和Rob Coalson教授的研究项目。 Asher 教授的小组正在进行实验研究，Coalson 小组正在理论上研究静电相互作用如何决定形成光子晶体材料的晶体胶体阵列 (CCA) 的自组装和结构排序。该项目将研究高浓度、低盐悬浮液中高电荷、单分散胶体颗粒的静电相互作用的性质。该项目的实验部分旨在通过使用胶体探针原子力显微镜对浓缩的高电荷胶体颗粒分散体直接测量静电相互作用来揭示基本静电相互作用的形式。 这项工作通过监测 CCA 的光衍射来检查这些颗粒在面心立方 CCA 阵列中的电荷诱导自组装。这些实验结果将通过模拟高浓度、高带电粒子分散体中胶体粒子相互作用的理论计算来合理化。该项目将使人们对强相互作用的胶体和大分子中的静电相互作用有一个基本的了解。 这些相互作用在生物和材料系统中普遍存在。此外，加深了解将促进纳米科学和纳米技术的进步，特别是在通过电荷诱导自组装自下而上制造光子晶体材料方面。从事该项目的研究生和博士后研究人员将被培训成为学术科学、政府研究实验室和工业界的创新研究人员和领导者。通过这个研究项目，阿舍教授和科尔森教授将为本科生提供研究培训，并为大匹兹堡社区各个级别的学生提供丰富的机会。