Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle
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 &...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2012-01-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/12/1189/2012/acp-12-1189-2012.pdf |
| _version_ | 1819293326213382144 |
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| author | M. J. Wheeler A. K. Bertram |
| author_facet | M. J. Wheeler A. K. Bertram |
| author_sort | M. J. Wheeler |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-24T04:08:39Z |
| format | Article |
| id | doaj.art-57ba9e1af84b460bafa019bd3dcd9e9e |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-24T04:08:39Z |
| publishDate | 2012-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-57ba9e1af84b460bafa019bd3dcd9e9e2022-12-21T17:16:07ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242012-01-011221189120110.5194/acp-12-1189-2012Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angleM. J. WheelerA. K. BertramDeposition 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.http://www.atmos-chem-phys.net/12/1189/2012/acp-12-1189-2012.pdf |
| spellingShingle | M. J. Wheeler A. K. Bertram Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle Atmospheric Chemistry and Physics |
| title | Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle |
| title_full | Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle |
| title_fullStr | Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle |
| title_full_unstemmed | Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle |
| title_short | Deposition nucleation on mineral dust particles: a case against classical nucleation theory with the assumption of a single contact angle |
| title_sort | deposition nucleation on mineral dust particles a case against classical nucleation theory with the assumption of a single contact angle |
| url | http://www.atmos-chem-phys.net/12/1189/2012/acp-12-1189-2012.pdf |
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