AAAR 31st Annual Conference
October 8-12, 2012
Hyatt Regency Minneapolis
Minneapolis, Minnesota, USA
Abstract View
Vapor Nucleation Rate Surfaces for Some Systems with Polymorphous Phase Transitions
Michael Anisimov, Elena Fominykh, PHILIP K. HOPKE, Tech. Design Inst. of Scientific Instrument Engr SB RAS
Abstract Number: 64 Working Group: Aerosol Nucleation: From Clusters to Nanoparticles
Abstract The formation of new phase embryos is described by nucleation theory. However, nucleation is not yet fully understood. The goal of the present research is to design nucleation rate surface topologies for systems with Polymorphous Phase Transitions. Substantial inconsistencies have been reported among experimental data that may originate from the use of different experimental approaches. These inconsistencies lead to the hypothesis that typical vapor/liquid nucleation rate measurements include an uncontrolled parameter [M. P. Anisimov, E. G. Fominykh, P. K. Hopke. Vapor-Gas/Liquid Nucleation Experiments: A Review of the Challenges. J. Aerosol Sci. 40, 733-746, 2009]. It looks attractive to develop new ideas to get vision of the nucleation rate surface topology. Our idea for the nucleation rate surface semiempirical design over the phase equilibria diagrams was used [M. P. Anisimov, P. K. Hopke at al. Relation of phase state diagrams and surfaces of new phase nucleation rates. (1998) J. Phys. Chem. V. 109(4) P.1435-1444]. Several nucleation rate topologies for systems with the monotropic and enantiotropic polymorphic phase transitions have been designed. It was found that multichannel vapor nucleation appeared in the all of these cases. Each nucleation channel is associated the individual nucleation rate surface. The traditional use of nucleation rate theory in a one channel approximation for these systems was completely invalid .