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

合作研究：功能级和介孔二氧化硅薄膜制备和表征的新途径

• 批准号: 0648716
• 负责人: Maryanne Collinson
• 金额: --
• 依托单位: Virginia Commonwealth 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 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0648716&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教授在分析和表面化学项目的支持下，探索了新型介孔膜的合成和性能。制备包含成分梯度的薄膜和表面是当代科学兴趣的一个话题。这种包含极性、孔隙度和离子位点密度梯度的“功能梯度”材料具有潜在的应用前景，可作为分离的固定相，用于化学或生物传感器的吸收/吸附层，以及调节细胞表面粘附，指导神经元生长，甚至驱动液体运输的手段。在这项合作提案中，研究人员正在研究一种独特的方法，利用溶胶-凝胶化学和当代电化学沉积技术，创造出具有厚度、孔隙度和成分梯度的二氧化硅薄膜。这些材料固有的复杂性和多变的性质激发了单分子成像和光谱学（SMS）的使用，以获得纳米尺度和分子水平的详细信息。SMS方法将发展，以获得有关孔径变化和微环境极性沿梯度的信息。除了这些新的功能梯度材料，在干燥或溶液性质变化时表现出可逆收缩的介孔材料也将在单孔水平上被制造和表征。具有可逆收缩和膨胀特性的材料在捕获和隔离污染物以及控制药物、农药和化肥的释放方面具有潜在的用途。新型的单分子荧光共振能量转移（FRET）方法将用于监测这些材料的孔径变化，具有纳米级的灵敏度。在堪萨斯州立大学和弗吉尼亚联邦大学参加这项研究的学生将在合成、材料科学和单分子光谱学方面获得不同寻常的广泛经验。所有参与这项研究的参与者都将受益于该计划提供的全面教育，通过每周网络会议分享知识、数据和材料，并定期到合作实验室实地考察。