Hydrocarbon Thin Films as Models for Organic Aerosols

有了这个新的奖项，有机和高分子化学计划支持博尔德市科罗拉多大学化学系G.Barney Ellison博士的工作。这项工作将包括研究表面活性分子(如硬脂酸、油酸或1-油氧基-2-棕榈酰基-3-磷环胆碱)镀在氯化钠上并受到羟基自由基(由Ar中的H2O电晕放电产生，并通过静电六极杆过滤)在大气气体如O2、NO、SO2或O3存在下的氧化。在表面的反应之后，将在真空室中进行红外和紫外光谱分析，并使用残留气体分析仪测量释放出的任何小分子。拟在研究中研究的反应涉及固体氯化钠上薄有机层的氧化，是海洋上空大气气溶胶颗粒外表面发生反应的模型，在那里生物表面活性物质分子覆盖着海洋喷雾形成的卤水液滴。了解化学对于模拟气溶胶粒子在云形成、全球变暖和臭氧消耗中的作用是很重要的。

With this new award the Organic and Macromolecular Chemistry Program supports the work of Dr. G. Barney Ellison of the Department of Chemistry at the Universito of Colorado in Boulder. The work will involve studying the oxidation of monolayer films of surfactant molecules (such as stearic acid, oleic acid, or 1-oleoyo-2-palmitoyl-3-phosphatyclcholine) plated on NaCl and bombarded with hydroxyl radicals (generated by a corona discharge of H2O in Ar and filtered by an electrostatic hexapole), in the presence of atmospheric gases such as O2, NO, SO2, or O3. Reactions at the surface will be followed by infrared and ultraviolet spectroscopies in a vacuum chamber, and any small molecules emitted measured with a residual gas analyzer. The reactions to be studied in the research proposed, involving the oxidation of thin organic layers on solid NaCl, are models for the reactions taking place on the outer surfaces of atmospheric aerosol particles over oceans, where biogenic surfactant molecules coat brine droplets formed from ocean spray. Understanding the chemistry is important for modeling the roles of aerosol particles in cloud formation, global warming, and ozone depletion.