Abstract
The first experimental study on the temperature dependence (263-288 K) of heterogeneous nucleation of water vapor on neutral insoluble Ag and soluble NaCl particles (3.5-8 nm) is presented. Heterogeneous nucleation probability was measured as a function of saturation ratio for different seed particle diameters and nucleation temperatures by means of an expansion type condensation particle counter (CPC) - the Size Analyzing Nuclei Counter (SANC). Water vapor onset saturation ratios were also determined. Results revealed an unusual temperature trend for Ag particles, while the temperature effect for NaCl seeds was found to be in qualitative agreement with theory. In order to exclude potential experimental artifacts the effect of temperature on homogeneous nucleation of water vapor was investigated as well and agreement with theoretical predictions was observed.
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