Effects of seed particle size and composition on heterogeneous nucleation of n-nonane |
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Authors: | Paul M. Winkler Anca Hienola Gerhard Steiner Gerard Hill Aron Vrtala Georg P. Reischl Markku Kulmala Paul E. Wagner |
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Affiliation: | aFakultät für Physik, Universität Wien, Boltzmanngasse 5, A-1090 Wien, Austria;bDepartment of Physical Sciences, P.O. Box 64, FIN-00014 University of Helsinki, Finland |
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Abstract: | Heterogeneous nucleation of supersaturated n-nonane vapour on seed particles of different size and composition has been investigated using a fast expansion chamber. Monodisperse seed particle sizes were ranging from about 4 nm up to about 24 nm in diameter. By using different types of particle generators WOx, Ag and (NH4)2SO4 particles were generated. For direct comparison between different particle compositions overlapping sizes have been generated for WOx and Ag at about 7 nm particle diameter as well as for Ag and (NH4)2SO4 at about 15 nm. Nucleation temperature was kept constant at about 278 K. Experimental data were compared to Kelvin equation and Fletcher theory including the effect of line tension. It was found that heterogeneous nucleation of n-nonane seems to be independent of seed particle composition and starts well below the Kelvin curve. Good agreement was achieved with Fletcher theory including the effect of line tension. |
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Keywords: | Heterogeneous nucleation n-Nonane Seed particle Fletcher theory |
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