ICC: Size and Structure Sensitivity of Metal Nanoparticle Reactivity in the Aerosol State

由美国国家科学基金会国际科学与工程办公室（OISE）和德国研究基金会（DFG）资助的分析和表面化学（ASC）项目将支持美国明尼苏达大学Jeffrey Roberts教授和德国卡尔斯鲁厄大学Gerhard Kasper教授的国际化学合作（ICC）研究项目。这两个小组将研究与催化相关的小分子（如氧、氢、一氧化碳和简单的不饱和碳氢化合物）在雾化金纳米颗粒上的吸收和反应。明尼苏达小组将使用透射电子显微镜（TEM）和傅立叶变换红外光谱（FTIR）测量4-20 nm粒径范围内分析相关分子的粒径依赖摄取概率。卡尔斯鲁厄大学的研究人员将通过FTIR探测颗粒介导反应过程中的气相组成，直接测量金气溶胶颗粒的催化活性。他们还将应用气溶胶光电子能谱（APES）技术来研究催化反应过程中粒子的光电响应，该技术在全球只有不到5个实验室可用。由于这些共同的努力，明尼苏达和卡尔斯鲁厄的研究小组将能够提供一个更完整的金属气溶胶反应性的图像。国际合作项目将为学生提供良好的培训机会，这些学生将开展一项基础研究项目，旨在开发研究和思考气溶胶表面化学的新方法，特别是在纳米尺度的气溶胶颗粒中。

The Analytical and Surface Chemistry (ASC) Program with contribution from the NSF Office of International Science and Engineering (OISE), and the German Research Foundation (DFG) will support the international collaboration in chemistry (ICC) research project of Prof. Jeffrey Roberts of the University of Minnesota and Prof. Dr. Gerhard Kasper at the University of Karlsruhe in Germany. The two groups will study the uptake and reaction of small, catalytically relevant molecules- e.g., oxygen, hydrogen, carbon monoxide, and simple unsaturated hydrocarbons- onto aerosolized gold nanoparticles. The Minnesota group will measure particle size-dependent uptake probabilities of analytically relevant molecules in the particle size range of 4-20 nm using transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Researchers at Karlsruhe will directly measure catalytic activity of gold aerosol particles by using FTIR to probe gas-phase composition during particle-mediated reactions. They will also apply the technique of aerosol photoelectron spectroscopy (APES), which is available in fewer than 5 laboratories worldwide, to study the photoelectric response of particles during catalytic reactions. As a result of these combined efforts, the Minnesota and Karlsruhe teams will be able to provide a much more complete picture of metal aerosol reactivity. The international collaborative project will provide excellent training opportunities to students who will carry out a fundamental research project aiming to develop new methods for studying and thinking about aerosol surface chemistry, especially in nanometer-dimension aerosol particles.