Collaborative Research: New Routes for the Preparation and Characterization of Functionally-Graded and Mesoporous Silica Thin Films

合作研究：功能梯度和介孔二氧化硅薄膜制备和表征的新途径

• 批准号: 0647849
• 负责人: Daniel Higgins
• 金额: $ 27.15万
• 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: 2007
• 资助国家: 美国
• 起止时间: 2007-04-01 至 2010-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0647849&HistoricalAwards=false
• 关键词: Collaborative; Research; New; Routes; Preparation

Professor Daniel A. Higgins of Kansas State University and Professor Maryanne M. Collinson of Virginia Commonwealth University are supported by the Analytical and Surface Chemistry Program to explore the synthesis and properties of novel mesoporous films. The preparation of films and surfaces incorporating compositional gradients is a topic of contemporary scientific interest. Such "functionally graded" materials incorporating gradients in polarity, porosity, and ionic site density have potential applications as stationary phases for separations, as absorbent/adsorbent layers for use in chemical or biological sensors, and as a means to regulate surface adhesion of cells, to direct the growth of neurons, and even to drive the transport of liquids. In this collaborative proposal, a unique approach is being studied for creating silica films that incorporate gradients in thickness, porosity, and composition using sol-gel chemistry and contemporary electrochemical deposition techniques. The inherent complexity and the variable nature of these materials inspired the use of single molecule imaging and spectroscopy (SMS) to obtain detailed information at the nanoscale and molecular level. SMS methods will be developed to obtain information on variations in pore size and microenvironment polarity along the gradients. In addition to these new functionally graded materials, mesoporous materials that exhibit reversible shrinkage in response to drying or changes in solution properties will also be made and characterized at the single pore level. Materials that exhibit reversible shrinking and expansion are potentially useful for the capture and sequestration of pollutants and for the controlled release of drugs, pesticides and fertilizers. Novel single-molecule fluorescence resonance energy transfer (FRET) methods will be used to monitor pore size variations in these materials with nanometer-scale sensitivity. Students participating in this research at Kansas State and Virginia Commonwealth will receive an unusually broad experience in synthesis, materials science and single molecule spectroscopy. All the participants involved in this research will benefit from the comprehensive education provided by this program via the sharing of knowledge, data and materials in weekly web conferences and periodic site visits to the collaborating laboratories.

堪萨斯州立大学的Daniel A. Higgins教授和弗吉尼亚联邦大学的Maryanne M. Collinson教授得到了分析和表面化学计划的支持，以探索新型介孔电影的综合和特性。结合构图梯度的薄膜和表面的制备是当代科学兴趣的话题。 这种“功能分级”的材料在极性，孔隙率和离子位点密度中具有潜在的应用作为分离的固定相，作为用于化学或生物学传感器的吸收/吸附层，作为用于化学或生物学传感器的一种方法，并作为调节细胞表面粘附的一种手段，以指导神经元的生长，甚至可以驱动液体的运输。 在这项协作提案中，正在研究一种独特的方法，用于创建二氧化硅膜，该二氧化硅膜使用溶胶 - 凝胶化学和当代电化学沉积技术的厚度，孔隙率和组成中的梯度。 这些材料的固有复杂性和可变性质启发了单分子成像和光谱（SMS）在纳米级和分子水平上获取详细信息。将开发SMS方法以获取有关沿梯度沿孔径和微环境极性变化的信息。 除了这些新的功能分级材料外，还将在单个孔隙水平上制定和表征响应干燥或溶液特性变化的介孔材料。 表现出可逆收缩和膨胀的材料可能可用于捕获和隔离污染物以及药物，农药和肥料的受控释放。 新型的单分子荧光共振能量转移（FRET）方法将用于监测具有纳米尺度敏感性的这些材料中的孔径变化。 参加堪萨斯州立大学和弗吉尼亚州研究的这项研究的学生将在合成，材料科学和单分子光谱方面具有异常广泛的经验。参与这项研究的所有参与者将通过本计划提供的全面教育，通过在每周网络会议上共享知识，数据和材料提供的全面教育，并定期访问合作实验室。