CAREER: Particle Morphology and Composition Effects on Chemical Reaction Rates in Aerosols

该项目将使用两种互补的技术来研究气溶胶中的化学反应：气溶胶化学电离质谱仪(气溶胶化学电离质谱仪)和单粒子质谱仪(SPMS)。我们将研究气相臭氧与不饱和有机物在不同模型颗粒中的“探测”反应，以确定不同类型的颗粒如何影响反应速率。这些模型粒子由有机、腐殖质、烟尘和无机成分组成，将用于表示大气中发现的不同类型的气溶胶。这些颗粒的形态将使用透射电子显微镜(TEM)进行研究，以寻找物理特征(例如，分形性、孔隙率等)之间的相关性。以及粒子的反应性。其目标是通过阐明颗粒形态和潜在颗粒底物如何影响反应性来帮助降低环境颗粒物的复杂性。将与亚特兰大芬班克科学中心的教师和工作人员一起开展教育和推广活动，以帮助所有年龄段的学生了解特定的大气化学和空气质量问题。这些活动包括在亚特兰大芬班克科学中心的科学磁铁计划的课程中引入大气化学部分，在科学中心开发关于全球变暖或烟雾形成等问题的大气科学展览，以及创建教师资源包，作为教师的独立资源，每个包侧重于与大气化学或空气污染有关的特定主题。

This project will use two complementary techniques to investigate chemical reactions in aerosols: Aerosol Chemical Ionization Mass Spectrometry (Aerosol CIMS) and Single-Particle Mass Spectrometry (SPMS). A "probe" reaction between gas-phase ozone and unsaturated organics in various model particles will be studied to determine how different types of particles can influence reaction rates. These model particles, consisting of organic, humic, soot and inorganic components, will be used to represent different types of aerosols found in the atmosphere. The morphology of these particles will be studied using a Transmission Electron Microscope (TEM), to seek correlations between the physical features (e.g. fractal nature, porosity, etc.) and the reactivity of the particles. The goals are to help reduce the complexity of ambient particles by elucidating how particle morphology and the underlying particle substrate influence reactivity.Educational and outreach activities will be developed in conjunction with teachers and staff at the Fernbank Science Center in Atlanta in order to help educate students of all ages about specific atmospheric chemistry and air quality issues. The activities include the introduction of an Atmospheric Chemistry component into the curriculum of a science magnet program at the Fernbank Science Center in Atlanta, development of an Atmospheric Sciences exhibit at the Science Center on issues such as global warming or smog formation, and creation of Teacher Resource Kits designed as stand-alone resources for teachers, with each kit focusing on a particular topic related to atmospheric chemistry or air pollution.