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URN: urn:nbn:de:swb:90-525050
DOI: 10.5194/acpd-15-28575-2015

Observation of viscosity transition in α-pinene secondary organic aerosol

Järvinen, E.; Ignatius, K.; Nichman, L.; Kristensen, T. B.; Fuchs, C.; Höppel, N.; Corbin, J. C.; Craven, J.; Duplissy, J.; Ehrhart, S.; El Haddad, I.; Frege, C.; Gates, S. J.; Gordon, H.; Hoyle, C. R.; Jokinen, T.; Kallinger, P.; Kirkby, J.; Kiselev, A.; Naumann, K.-H.; ... mehr

Under certain conditions, secondary organic aerosol (SOA) particles can exist in the atmosphere in an amorphous solid or semi-solid state. To determine their relevance to processes such as ice nucleation or chemistry occurring within particles requires knowledge of the temperature and relative humidity (RH) range for SOA to exist in these states. In the CLOUD experiment at CERN, we deployed a new in-situ optical method to detect the viscosity of α-pinene SOA particles and measured their transition from the amorphous viscous to liquid state. The method is based on the depolarising properties of laboratory-produced non-spherical SOA particles and their transformation to non-depolarising spherical liquid particles during deliquescence. We found that particles formed and grown in the chamber developed an asymmetric shape through coagulation. A transition to spherical shape was observed as the RH was increased to between 35 % at −10 °C and 80 % at −38 °C, confirming previous calculations of the viscosity transition conditions. Consequently, α-pinene SOA particles exist in a viscous state over a wide range of ambient conditions, including ... mehr

Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7367
KITopen ID: 1000052505
HGF-Programm 12.01.03; LK 01
Erschienen in Atmospheric Chemistry and Physics Discussions
Band 15
Heft 20
Seiten 28575-28617
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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