Single Molecule Spectroscopy Studies of the Nanoscale Properties of Microporous/Mesoporous Silicate Films Prepared by the Sol-Gel Process

溶胶-凝胶法制备微孔/介孔硅酸盐薄膜纳米性能的单分子光谱研究

• 批准号: 0316466
• 负责人: Daniel Higgins
• 金额: --
• 依托单位: Kansas State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0316466&HistoricalAwards=false
• 关键词: Single; Molecule; Spectroscopy; Studies; Nanoscale

Professors Daniel Higgins and Maryanne Collinson of Kansas State University are supported by the Analytical and Surface Chemistry Program to study microporous silicate thin films prepared using the sol-gel process using single molecule spectroscopy. These include inorganic silicates, organically modified silicates (ORMOSILS) and silicate films containing surfactant-templated mesopores. These materials are being used to develop new catalytic supports, chemical sensors, and chemical separations media. Important film properties to be explored include local diffusion rates of entrapped molecules, the local pH and site-specific variations in the pKa's of acidic surface groups, such as silanols, and intrinsic local polarity of the silicate matrix. Time- and frequency-resolved optical work utilizing pH-sensitive flurophores is a key approach. These studies will also allow the exploration of phase separation of inorganic and organic-rich domains. Single molecule methods are required in these studies because the materials are highly heterogeneous, and averaging over sites as in bulk spectroscopy does not allow one to quantify types of similar sites.This impact of this work lies in materials chemistry, chemical separation, catalysis, and sensor development. Characterization of the chemical sites within the material can lead to more rugged and better performing materials. Applications include environmental engineering and energy storage.

堪萨斯州立大学的丹尼尔·希金斯（Daniel Higgins）和玛丽安·科林森（Maryanne Collinson）得到了分析和表面化学计划的支持，该计划使用单分子光谱研究了使用SOL-GEL工艺制备的微孔硅酸盐薄膜。 这些包括无机硅酸盐，有机修饰的硅酸盐（Ormosil）和含有表面活性剂膜的中孔的硅酸盐膜。 这些材料用于开发新的催化支持，化学传感器和化学分离培养基。 要探索的重要膜特性包括酸性表面基团的PKA的局部pH和位点特异性变化的局部扩散速率，例如硅二醇，以及硅酸盐基质的内在局部极性。 利用pH敏感的荧光团的时间和频率分辨的光学工作是关键方法。 这些研究还将允许探索无机和有机富集结构域的相位分离。 在这些研究中需要单分子方法，因为材料是高度异质性的，并且在地点上平均，因为在批量光谱中，不允许人们量化类似地点的类型。这项工作的影响在于材料化学，化学分离，催化和传感器的发展。 材料中化学位点的表征会导致更坚固且性能更好的材料。 应用包括环境工程和储能。