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| Titel |
Climate-relevant physical properties of molecular constituents for isoprene-derived secondary organic aerosol material |
| VerfasserIn |
M. A. Upshur, B. F. Strick, V. F. McNeill, R. J. Thomson, F. M. Geiger |
| 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 ; 14, no. 19 ; Nr. 14, no. 19 (2014-10-10), S.10731-10740 |
| Datensatznummer |
250119094
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| Publikation (Nr.) |
 copernicus.org/acp-14-10731-2014.pdf |
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| Zusammenfassung |
| Secondary organic aerosol (SOA) particles, formed from
gas-phase biogenic volatile organic compounds (BVOCs), contribute large
uncertainties to the radiative forcing that is associated with aerosols in
the climate system. Reactive uptake of surface-active organic oxidation
products of BVOCs at the gas–aerosol interface can potentially decrease the
overall aerosol surface tension and therefore influence their propensity to
act as cloud condensation nuclei (CCN). Here, we synthesize and measure some
climate-relevant physical properties of SOA particle constituents consisting
of the isoprene oxidation products α-, δ-, and cis- and
trans-β-IEPOX (isoprene epoxide), as well as syn- and anti-2-methyltetraol.
Following viscosity measurements, we use octanol–water partition
coefficients to quantify the relative hydrophobicity of the oxidation
products while dynamic surface tension measurements indicate that aqueous
solutions of α- and trans-β-IEPOX exhibit significant surface
tension depression. We hypothesize that the surface activity of these
compounds may enhance aerosol CCN activity, and that trans-β-IEPOX may be
highly relevant for surface chemistry of aerosol particles relative to other
IEPOX isomers. |
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