Electroanalytical Applications of Organically Modified Sol-Gel Materials

这项由分析和表面化学计划支持的学院早期职业发展(CALEAR)项目旨在探索和表征有机改性溶胶-凝胶的形成、性质和应用。这些无机-有机杂化材料的独特性能有待充分开发。我们将研究溶质被包裹在这些材料中的机理以及对这一过程的控制。超微电极循环伏安法将用于跟踪烷氧基硅烷在这些材料表面的水解和缩合过程中发生的局部物理和化学变化。循环伏安法和电致化学发光法将被用来表征在加工条件下包埋在溶胶-凝胶基质中的带电氧化还原小探针的迁移率和可及性。这一职业研究项目的实际成果将集中在用于电分析研究的渗透选择涂层的开发和电化学发光传感器的制造上。柯林森教授将把这些研究成果与一项教育计划结合起来，其中包括为本科生和研究生开发一门科学伦理课程。还计划对化学分析本科课程的实验室部分进行重大修订。为了培养学生的兴趣，本课程还将采用更具创造性和现实性的样本进行分析，特别要注意取证和环境应用。发展对作为进行化学的环境的溶胶-凝胶基质的特性的基本了解是这项职业研究提案的重要目标。从长远来看，能够使用有机改性硅酸盐为特定应用量身定做这些基质将具有战略意义。在溶胶-凝胶干燥时产生的干凝胶本身具有有趣的性质，这可能导致在电子、磁性、光学材料和衍生产品中的有用应用。柯林森教授旨在正式介绍科学伦理和科学行为的当代问题是及时的，这门课程将使堪萨斯州立大学的学生更清楚地理解这一主题。

This Faculty Early Career Development (CAREER) project, supported in the Analytical and Surface Chemistry Program, aims to explore and characterize the formation, properties and applications of organically modified sol-gels. The unique properties of these hybrid inorganic-organic materials remain to be exploited fully. The mechanism by which solutes become entrapped in these materials and the control of this process will be studied. Cyclic voltammetry (CV) with ultramicroelectrodes will be used to follow local physical and chemical changes that occur during hydrolysis and condensation of alkoxysilanes on the surfaces of these materials. CV and electrogenerated chemiluminescence will be used to characterize the mobility and accessibility of small charged redox probes entrapped in the sol-gel matrix under processing conditions. Practical results from this CAREER research project will focus on the development of permselective coatings for electroanalytical investigations and the fabrication of electrochemiluminscent sensors. Professor Collinson will combine these research thrusts with an educational plan that includes the development of a course in scientific ethics for both undergraduate and graduate students. A major revision of the laboratory component of an undergraduate course in chemical analysis is also planned. Student interest is to be cultivated by also employing more creative and realistic samples for analysis in this course with particular attention to forensic and environmental applications. The development of a fundamental understanding of the characteristics of the sol-gel matrix as an environment in which to do chemistry is an important objective of this CAREER research proposal. In the long term being able to tailor these matrices to a particular application using organically modified silicates will have strategic impact. The xerogels that are produced upon drying of sol-gels have interesting properties in their own right which could lead to useful applications in electronic, magnetic, optical materials and derived products. Professor Collinson's aim to introduce formally contemporary issues in scientific ethics and scientific conduct is timely, and this course will enable the students at Kansas State University to more clearly understand this topic.