Cloud droplet activation and surface tension of mixtures of slightly soluble organics and inorganic salt S. Henning1, T. Rosenørn1, B. D'Anna2, A. A. Gola3, B. Svenningsson1, and M. Bilde1 1Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark 2Department of Chemistry, University of Oslo, N-0315 Oslo, Norway 3Department of Physical Chemistry, Medical University of Wroclaw, pl. Nankiera 1, 50-140 Wroclaw, Poland
Abstract. Critical supersaturations for internally mixed particles of adipic
acid, succinic acid and sodium chloride were determined
experimentally for dry particles sizes in the range
40-130nm. Surface tensions of aqueous solutions of the
dicarboxylic acids and sodium chloride corresponding to
concentrations at activation were measured and parameterized as a
function of carbon content. The activation of solid particles as
well as solution droplets were studied and particle phase was
found to be important for the critical supersaturation.
Experimental data were modelled using Köhler theory modified to
account for limited solubility and surface tension lowering.
Citation: Henning, S., Rosenørn, T., D'Anna, B., Gola, A. A., Svenningsson, B., and Bilde, M.: Cloud droplet activation and surface tension of mixtures of slightly soluble organics and inorganic salt, Atmos. Chem. Phys., 5, 575-582, doi:10.5194/acp-5-575-2005, 2005.