Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 5 2008 10.5194/acpd-8-18295-2008 http://www.atmos-chem-phys-discuss.net/8/18295/2008/ http://www.atmos-chem-phys-discuss.net/8/18295/2008/acpd-8-18295-2008.html http://www.atmos-chem-phys-discuss.net/8/18295/2008/acpd-8-18295-2008.pdf 18295 18321 2008-10-21 Homogeneous vs. heterogeneous nucleation in water-dicarboxylic acid systems A. I. Hienola anca.hienola@helsinki.fi H. Vehkamäki I. Riipinen M. Kulmala Department of Physics, Division of Atmospheric Sciences and Geophysics, University of Helsinki, P.O. Box 64, 00014 University of Helsinki, Finland Binary heterogeneous nucleation of water-succinic/glutaric/malonic/adipic acid on nanometer-sized particles is investigated within the frame of classical heterogeneous nucleation theory. Homogeneous nucleation is also included for comparison. It is found that the nucleation probabilities depend on the contact angle and on the size of the seed particles. New thermodynamical properties, such as saturation vapor pressure, density and surface tension for all the dicarboxylic acid aqueous solutions are included in the calculations. While the new surface tension and density formulations do not bring any significant difference in the computed nucleation rate for homogeneous nucleation for succinic and glutaric acids, the use of the newly derived equations for the vapor pressure decrease the acid concentrations in gas phase with 3 orders of magnitude. According to our calculations, the binary heterogeneous nucleation of succinic acid-water and glutaric acid-water – although it requires a 3–4 orders of magnitude lower vapor concentrations than the homogeneous nucleation – cannot take place in atmospheric conditions. 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