AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
Heterogeneous Nucleation of CO2 on H2O Ice Particles
SHINOBU TANIMURA, Yensil Park, Barbara Wyslouzil, The Ohio State University
Abstract Number: 547 Working Group: Aerosol Physics
Abstract Heterogeneous nucleation of CO$_2 on H$_2O ice particles is thought to provide a possible pathway for the formation of CO$_2 clouds in the Martian atmosphere. The same process, when combined with inertial separation, may provide a way to capture CO$_2 from flue gas expanding in a supersonic nozzle. In this work we investigated the heterogeneous nucleation of CO$_2 on H$_2O ice particles in the steady supersonic flows by means of pressure trace measurement and small angle x-ray scattering experiments, and determined the onset conditions for the nucleation of CO$_2 on the H$_2O ice particles as a function of the particle size. The ice particle radius was about 2 to 5 nm and the temperatures at onset ranged from 120 to 150 K. The experimental results suggest that the nucleation of CO$_2 on the H$_2O ice particles starts in the supercooled liquid state, and the subsequent condensation proceeds in the solid state in a time scale of a few tens of micro-seconds.