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| Titel |
Surfaces phases of n-butanol and the effect on water uptake |
| VerfasserIn |
Panos Papagiannakopoulos, Erik S. Thomson, Xiangrui Kong, Jan B. C. Pettersson |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250078495
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| Zusammenfassung |
| Water interactions with organic surfaces are of central importance to both biological and
geophysical processes. In the atmosphere the hygroscopicity of primary and secondary
aerosols, and the formation and lifetime of cloud droplets and ice particles can
be influenced by organic coatings. Here we report findings from Environmental
Molecular Beam measurements of butanol surfaces at temperatures relevant in the upper
atmosphere, 160-200 K. Within ±5 K of the bulk melting temperature 184.5 K, surface
butanol is observed to have phase transition behavior distinctly different from what is
expected from a purely bulk viewpoint. The existence and extent of surface disorder
over a 10 K range straddling the bulk melting temperature is observed to affect the
molecular kinetics of impinging water, and leads to identifiable regimes of butanol-water
interaction. The implications for water uptake by atmospheric particles is discussed. |
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