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- Title
Deposition freezing on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle.
- Authors
Wheeler, M. J.; Bertram, A. K.
- Abstract
Deposition freezing on two mineral species, kaolinite and illite, was studied using a flow cell coupled to an optical microscope at ~240 K. The results show that the onset Sice (defined as the Siceconditions when ice first nucleated) is a strong function of the surface area available for nucleation, varying from 100% to 125 %. 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 onset Sicedata and the single-α model. In contrast to the single-α model, the active site model, the deterministic model, and a model with a normal distribution of contact angles fit the data within experimental uncertainties. Parameters from the fits to the data are presented.
- Subjects
MINERAL dusts -- Environmental aspects; ATMOSPHERIC nucleation; CONTACT angle; KAOLINITE; ILLITE; ATMOSPHERIC aerosols; CONDENSATION
- Publication
Atmospheric Chemistry & Physics Discussions, 2011, Vol 11, Issue 7, p21171
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-11-21171-2011