Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle
Item
Title (Dublin Core)
Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle
Description (Dublin Core)
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 <i>S</i><sub>ice</sub> conditions when ice first nucleated, defined as the onset <i>S</i><sub>ice</sub> (<i>S</i><sub>ice,onset</sub>), 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 <i>S</i><sub>ice,onset</sub> 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.
Creator (Dublin Core)
Wheeler, M. J.
Bertram, A. K.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-12-1189-2012
https://acp.copernicus.org/articles/12/1189/2012/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
