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| Titel |
Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle |
| VerfasserIn |
M. J. Wheeler, A. K. Bertram |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2012-01-30), S.1189-1201 |
| Datensatznummer |
250010555
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| Publikation (Nr.) |
 copernicus.org/acp-12-1189-2012.pdf |
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| Zusammenfassung |
| Deposition nucleation on two mineral species, kaolinite and illite, was
studied using a flow cell coupled to an optical microscope. The results show
that the Sice conditions when ice first nucleated, defined as the
onset Sice (Sice,onset), is a strong function
of the surface area available for nucleation, varying from 100% to 125%
at temperatures between 242 and 239 K. The surface area dependent data could
not be described accurately using classical nucleation theory and the
assumption of a single contact angle (defined here as the single-α
model). These results suggest that caution should be applied when using
contact angles determined from Sice,onset data and the
single-α model. In contrast to the single-α model, the active
site model, the deterministic model, and a model with a distribution of
contact angles fit the data within experimental uncertainties. Parameters
from the fits to the data are presented. |
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