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| Titel |
Homogeneous vs. heterogeneous nucleation in water-dicarboxylic acid systems |
| VerfasserIn |
A. I. Hienola, H. Vehkamäki, I. Riipinen, M. Kulmala  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 6 ; Nr. 9, no. 6 (2009-03-17), S.1873-1881 |
| Datensatznummer |
250007081
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| Publikation (Nr.) |
 copernicus.org/acp-9-1873-2009.pdf |
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| Zusammenfassung |
| 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 by 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 under atmospheric
conditions. On the other hand binary homogeneous nucleation of adipic
acid-water systems might be possible under conditions occuring in upper
boundary layer. However, a more detailed characterization of the interaction
between the surface and the molecules of the nucleating vapor should be
considered in the future. |
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