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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Reactive uptake of ozone by proxies for organic aerosols: Surface-bound and gas-phase products
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Reactive uptake of ozone by proxies for organic aerosols: Surface-bound and gas-phase products

机译：代理人对有机气溶胶的反应性吸收臭氧：表面结合的和气相的产品

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Gas-phase and surface-bound products were determined for the reaction of ozone with self assembled monolayers of alkanes and terminal alkenes serving as proxies for atmospheric organic aerosols. The organic surfaces were characterized using infrared (IR) spectroscopy (direct absorption and attenuated total reflection) as well as contact angle measurements with water before and after the reaction with ozone. The contact angle of the organic surfaces was reduced by similar to 20 degrees owing to the reaction. Following the reaction, IR absorption due to the presence of carbonyls and carboxylic acids was observed on the surface. Gas-phase products were determined using infrared spectroscopy immediately above the reaction surface. Under dry conditions, gas-phase formaldehyde yields of 0.5+/-0.1 for organic monolayers of allyltrichlorosilane (C-3(=)) and octenyltrichlorosilane (C-8(=)) terminal alkenes were observed, in good agreement with the yields observed for gas phase ozonolysis of terminal alkenes. Surfaces of n-octane (C-8) as well as processed alkene surfaces were nonreactive toward ozone. The reaction mechanism of ozone with the surface alkenes is discussed. Finally, the possible implications for the chemistry of organic aerosols are discussed and studied using a box model and realistic atmospheric scenarios. [References: 61]
机译：确定了气相和表面结合产物，以检测臭氧与烷烃和末端烯烃的自组装单分子层（作为大气有机气溶胶的代理）之间的反应。使用红外（IR）光谱（直接吸收和衰减的全反射）以及与臭氧反应之前和之后与水的接触角测量来表征有机表面。由于该反应，有机表面的接触角减小了约20度。反应后，在表面上观察到由于羰基和羧酸的存在引起的IR吸收。使用红外光谱法在反应表面正上方确定气相产物。在干燥条件下，发现烯丙基三氯硅烷（C-3（=））和辛烯基三氯硅烷（C-8（=））末端烯烃的有机单层气相甲醛产率为0.5 +/- 0.1，与观察到的产率高度吻合用于末端烯烃的气相臭氧分解。正辛烷（C-8）的表面以及加工过的烯烃表面均不与臭氧发生反应。讨论了臭氧与表面烯烃的反应机理。最后，使用盒模型和现实的大气情景讨论和研究了对有机气溶胶化学的潜在影响。 [参考：61]

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