COLL 474 |
| Jeffrey T. Roberts and Amanda Nienow. Department of Chemistry, University of Minnesota, 207 Pleasant St. SE, Minneapolis, MN 55455 |
| A method has been developed to conduct surface chemistry and extract surface kinetic rates from size-selected aerosol nanoparticles. The measurements encompass broad ranges of particle size, phase, and composition. Results will be presented on the growth and oxidation of soot nanoparticles of particle radius between 10 and 40 nm. Particles are investigated for changes in surface area and morphology using on-line instrumentation. Experiments emphasize two classes of reactive conditions: high temperature oxidation by O2 and NOx, and room temperature addition of hydrocarbons. We believe these to be the first measurements of soot oxidation and condensation kinetics that have been conducted on size-selected particles. The results are important because soot emission from combustion sources is dictated by the competing surfaces processes of growth and oxidation. More generally, the results represent one of the first kinetic and mechanistic studies of gas-phase nanoparticle reactivity. |
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Symposium in Memory of Arthur W. Adamson
8:30 AM-11:50 AM, Thursday, April 1, 2004 Marriott -- Orange County 3, Oral
Division of Colloid and Surface Chemistry |