 |
| Titel |
Modeling the surface tension of complex, reactive organic–inorganic mixtures |
| VerfasserIn |
A. N. Schwier, G. A. Viglione, Z. Li, V. Faye McNeill |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 21 ; Nr. 13, no. 21 (2013-11-05), S.10721-10732 |
| Datensatznummer |
250085789
|
| Publikation (Nr.) |
 copernicus.org/acp-13-10721-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Atmospheric aerosols can contain thousands of organic compounds which impact
aerosol surface tension, affecting aerosol properties such as heterogeneous
reactivity, ice nucleation, and cloud droplet formation. We present new
experimental data for the surface tension of complex, reactive
organic–inorganic aqueous mixtures mimicking tropospheric aerosols. Each
solution contained 2–6 organic compounds, including methylglyoxal, glyoxal,
formaldehyde, acetaldehyde, oxalic acid, succinic acid, leucine, alanine,
glycine, and serine, with and without ammonium sulfate. We test two
semi-empirical surface tension models and find that most reactive, complex,
aqueous organic mixtures which do not contain salt are well described by a
weighted Szyszkowski–Langmuir (S-L) model which was first presented by
Henning et al. (2005). Two approaches for modeling the effects of salt were
tested: (1) the Tuckermann approach (an extension of the Henning model with
an additional explicit salt term), and (2) a new implicit method proposed
here which employs experimental surface tension data obtained for each
organic species in the presence of salt used with the Henning model. We
recommend the use of method (2) for surface tension modeling of aerosol
systems because the Henning model (using data obtained from organic–inorganic
systems) and Tuckermann approach provide similar modeling results and
goodness-of-fit (χ2) values, yet the Henning model is a simpler and
more physical approach to modeling the effects of salt, requiring less
empirically determined parameters. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|