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UP: Fachverband Umweltphysik

UP 10: Atmosphäre - Spurengase, Aerosole und Labormessungen

UP 10.3: Vortrag

Mittwoch, 27. Februar 2013, 14:30–14:45, HS 5

Deliquescence and Efflorescence Behavior of Ternary Inorganic/Organic/Water Aerosol Particles — •Andreas Peckhaus¹, Stefan Graß², Lennart Treuel², and Reinhard Zellner² — ¹Karlsruher Institut für Technologie (KIT), Karlsruhe, Baden-Württemberg. — ²Universität Duisburg-Essen, Essen, Nordrhein-Westfalen.

The deliquescence behavior of ternary inorganic /organic/water aerosol particles has been investigated at room temperature using a surface aerosol microscopy (SAM) technique. The results obtained for the deliquescence relative humidities (DRH) for deposited particles of variable inorganic/organic contents show a eutectic behavior with the mixed particles showing deliquescence at lower DRH compared to the pure inorganic and organic components, respectively. This behavior has been quantitatively modeled using the extended aerosol inorganics (E-AIM) thermodynamic model of Clegg et al. in combination with the UNIFAC group activity approach to account for organic molecular solutes. In addition, we have investigated the efflorescence behavior of supersatured and formerly deliquesced ternary solution droplets using space resolved Raman spectroscopy. In the efflorescing aerosol particles a partial crystallization of individual components is found. Further drying of such droplets produces solid particles in which the inorganic and organic phases show some spatial separation with the organic component being predominantly found at the outer part of the particle.