Understanding Adsorption, Uptake and Reactive Processes at Aqueous Surfaces of Atmospheric Aerosol Importance

该项目由化学系环境化学科学项目资助，支持俄勒冈州大学的Geraldine里士满教授和她的学生对大气中重要的有机物种在模拟大气中水悬浮微粒的水溶液表面的吸附和反应性进行实验测量和理论计算。地球大气中的大部分化学物质都发生在被称为气溶胶的微小固体颗粒和液滴上。 虽然人们知道大气气溶胶对我们的气候和健康有重大影响，但对这些气溶胶颗粒上发生的吸附和反应过程以及它们在影响这些影响方面所起的作用知之甚少。 这些研究采取了逐步的方法来了解增加盐和有机表面组成和形态的表面气溶胶过程。 这些结果可能满足目前对环境界面的分子水平描述的需求，以及在环境相关条件下进行表面敏感和实时测量的需要。 国家的最先进的激光光谱和表面张力测量被用来测量的详细分子特性的吸附表面物种。分子动力学计算和密度泛函理论相结合的计算研究为这些实验研究提供了补充。 除了这些研究加速了对有助于空气质量的气溶胶表面化学的理解外，里士满教授还将这项研究用于对亚洲和非洲发展中国家科学家的外联活动，这些国家的空气和水质量都是当地和全球关注的问题。

This project funded by the Environmental Chemical Sciences Program in the Chemistry Division supports the efforts of Professor Geraldine Richmond and her students at the University of Oregon to perform experimental measurements and theoretical calculations of the adsorption and reactivity of atmospherically important organic species at the surface of aqueous solutions that mimic aqueous aerosols in the atmosphere. Much of the chemistry in the earth's atmosphere occurs on tiny specks of solid particles and liquid droplets known as aerosols. Although it is known that atmospheric aerosols have major impacts on our climate and our health, little is known about adsorption and reactive processes that occur on these aerosol particles and the role they play in influencing these impacts. The studies take a stepwise approach towards understanding surface aerosol processes of increasing salt and organic surface composition and morphology. The results may fill the current demand for a molecular-level description of environmental interfaces and the need for surface-sensitive and real-time measurements made under environmentally relevant conditions. State-of-the-art laser spectroscopic and surface tensiometry measurements are used to measure the detailed molecular characteristics of the adsorbed surface species. The computational studies that involve a combination of molecular dynamics calculations and density functional theory provide a complement to these experimental studies. In addition to these studies accelerating the understanding of aerosol surface chemistry that contributes to air quality, Professor Richmond uses this research in outreach activities to scientists in developing countries in Asia and Africa where air and water quality are both a local and global concern.