edu.ucar.opensky::articles:18145 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T13:41:33.523184 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7rj4m2b Experiments on the temperature dependence of heterogeneous nucleation on nanometer-sized NaCl and Ag particles 2010-12-10T00:00:00Z publication https://n2t.org/ark:/85065/d7rj4m2b https://doi.org/10.1002/cphc.201000417 Schobesberger, S. author Winkler, Paul author Pinterich, T. author Vrtala, A. author Kulmala, M. author Wagner, P. author UCAR/NCAR - Library publisher Experimental investigations on the activation of NaCl and Ag aerosol particles by heterogeneous nucleation of n-propanol vapor at well-defined vapor saturation ratios are presented. Particular emphasis is placed on the temperature dependence of this process from -11 to + 14 degrees C. Aerosols are generated in a tube furnace and electrostatically classified at mean geometric mobility equivalent diameters between 3.6 and 11 nm. Activation probabilities are measured by means of expansion chamber experiments, and onset n-propanol saturation ratios are subsequently determined. The experiments with Ag particles do not produce any unexpected results. The results for NaCl particles, however, show a temperature trend of the onset saturation ratios that is opposite to that predicted by classical nucleation theory. This stresses the important role that surface properties play in heterogeneous nucleation processes. By tentatively assuming a temperature-dependent contact angle, we are able to theoretically reproduce this reversed temperature trend. In addition, the shrinkage of NaCl condensation particles is investigated for varying amounts of n-propanol vapor, and contact angle measurements are performed at temperatures ranging from -7 to + 30 degrees C. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim None eng geoscientificInformation