Effects of seed particle size and composition on heterogeneous nucleation of n-nonane

Autor(en)

Paul Winkler, A. I. Hienola, Gerhard Steiner, Gerard Hill, Aron Vrtala, Georg Reischl, Markku Kulmala, Paul Wagner

Abstrakt

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 WO(x), Ag and (NH(4))(2)SO(4) particles were generated. For direct comparison between different particle compositions overlapping sizes have been generated for WO, and Ag at about 7 nm particle diameter as well as for Ag and (NH(4))(2)SO(4) 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.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

University of Helsinki, Universität Wien

Journal

Atmospheric Research

Band

90

Seiten

187-194

Anzahl der Seiten

8

ISSN

0169-8095

DOI

https://doi.org/10.1016/j.atmosres.2008.02.001

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

103008 Experimentalphysik, 210006 Nanotechnologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/fc2f3ad4-1557-42ae-aab3-05e83b2d43fd