TITLE

The influence of particle solubility on heterogeneous nucleation in binary vapor mixtures

AUTHOR(S)
Petersen, D.; Ortner, R.; Vrtala, A.; Laaksonen, A.; Kulmala, M.; Wagner, P. E.
PUB. DATE
August 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p135
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Heterogeneous nucleation of binary n-propanol — water vapor mixtures on non-soluble or partially soluble 8nm Ag and NaCl particles has been investigated experimentally. At constant temperature the vapor activities have been stepwise increased and the number of particles activated to condensational growth shows a comparatively steep increase until all particles have been activated. Onset activities were obtained for various mixing ratios of the binary vapor mixtures. In contrast to homogeneous nucleation, for binary heterogeneous nucleation only a conucleation without significant mutual enhancement was observed. Heterogeneous nucleation calculations based on Fletcher theory using experimentally obtained contact angles have been performed. Satisfactory agreement of the slopes of the nucleation probability curves was observed. However, considerable deviations between experimental and theoretical onset activities indicate problems of the binary nucleation theory based on the capillarity approximation. For NaCl particles and water rich mixtures the Köhler theory is in good agreement with the experimental data. On the other hand, for n-propanol rich mixtures and NaCl particles the heterogeneous nucleation calculations based on Fletcher theory provide a reasonable approximation of the experimental data. It appears that neither Fletcher nor Köhler theory are applicable to NaCl particles in the region of transition from water rich to n-propanol rich mixtures.
ACCESSION #
5669812

 

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    © 2000 American Institute of Physics.

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