AVS 49th International Symposium
    Surface Science Tuesday Sessions
       Session SS2-TuA

Paper SS2-TuA1
Surface Chemistry of Size-Selected Soot Nano-Aerosol Particles

Tuesday, November 5, 2002, 2:00 pm, Room C-110

Session: Atmospheric Surface Chemistry
Presenter: J.T. Roberts, University of Minnesota
Authors: J.T. Roberts, University of Minnesota
K.K. Higgins, University of Minnesota
A. Wensmann, University of Minnesota
M.R. Zachariah, University of Minnesota
Correspondent: Click to Email
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 (particle radius between 10 and 40 nm). The particles are investigated for changes in surface area using on-line nanoparticle characterization instrumentation. Experiments emphasize two classes of reactive conditions: h igh temperature oxidation by O@sub 2@ and NO@sub x@, 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. Th e result s 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.