ENVR 8 |
| To help scientists understand the fundamental surface chemistry of aerosols, we synthesized, characterized and reacted tropospherically relevant terpenes bound to silica substrates to model mineral dust aerosol surfaces. Utilizing ester, amide and aniline linker chemistries, the latter of which is spectroscopically silent in the aliphatic C-H stretching region where our terpenes of interest exhibit molecular vibrations of interest, we elucidated the surface orientation of these atmospherically relevant terpenes and tracked their heterogeneous reactions with ozone in real time with broadband vibrational sum frequency generation (SFG). After exposing the terpene-functionalized surfaces to low ppm levels of ozone at 1 atm and 300 K, the initial reaction probabilities of a surface-bound limonene model were determined. SFG spectroscopy was successfully used to determine the reaction probabilities of heterogeneous organic C=C oxidation reactions, bridging the gap between atmospheric chemistry and surface science. Special consideration was given to the role of molecular chirality in these surface processes. |
|
Atmospheric Aerosol Processes
8:30 AM-11:45 AM, Sunday, August 19, 2007 Boston Park Plaza -- Stanbro Rm, Oral
Division of Environmental Chemistry |