AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Heterogeneous Nucleation of CO2 on n-Alkane Nanodroplets
YENSIL PARK, Barbara Wyslouzil, The Ohio State University
Abstract Number: 217 Working Group: Aerosol Physics
Abstract In earlier work (Tanimura et al. 2015) we investigated the heterogeneous nucleation of CO2 on small ice particles. Heterogeneous nucleation depended on the size of the particles, but never required supersaturations beyond those defined by of the extrapolated supercooled liquid CO2 line. Here we extend this work to consider heterogeneous nucleation of CO2 on liquid n-pentane droplets and solid n-hexane particles. All experiments are conducted in a supersonic nozzle using pressure trace measurements (PTM), Small Angle X-ray Scattering (SAXS), and Fourier Transform Infrared Spectroscopy (FTIR) to characterize the phase transitions. In both cases, we considered three n-alkane mass fractions and 12% of CO2 in the inlet flow. This talk will summarize how the nature and state of the alkane determines the conditions for the onset of CO2 condensation as well as the final particle structure. In all cases, CO2 condensation onto the n-alkanes required significantly higher supersaturations than CO2 condensation onto water ice.
Reference: Tanimura et al. (2015) RSC Adv., 5, 105537-105550.