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

由NSF国际科学与工程办公室(OISE)和德国研究基金会(DFG)贡献的分析和表面化学(ASC)计划将支持明尼苏达大学的杰弗里·罗伯茨教授和德国卡尔斯鲁厄大学的格哈德·卡斯珀教授的国际化学合作(ICC)研究项目。这两个小组将研究小的、催化相关的分子--例如，氧、氢、一氧化碳和简单的不饱和碳氢化合物--在气雾化的金纳米颗粒上的吸收和反应。明尼苏达州的研究小组将使用透射电子显微镜和傅里叶变换红外光谱技术，在4-20纳米的粒度范围内测量与颗粒大小相关的分析相关分子的吸收概率。卡尔斯鲁厄大学的研究人员将通过使用FTIR来探测粒子介导的反应中的气相组成，从而直接测量金气溶胶粒子的催化活性。他们还将应用全球不到5个实验室可用的气溶胶光电子能谱(APES)技术来研究催化反应期间颗粒的光电响应。作为这些共同努力的结果，明尼苏达和卡尔斯鲁厄团队将能够提供更完整的金属气溶胶反应性图景。这一国际合作项目将为学生提供极好的培训机会，他们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，特别是纳米气溶胶颗粒。

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.