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Ccn Activation of Fumed Silica Aerosols Mixed with Soluble Pollutants : Volume 14, Issue 16 (08/09/2014)

By Dalirian, M.

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Book Id: WPLBN0003988943
Format Type: PDF Article :
File Size: Pages 40
Reproduction Date: 2015

Title: Ccn Activation of Fumed Silica Aerosols Mixed with Soluble Pollutants : Volume 14, Issue 16 (08/09/2014)  
Author: Dalirian, M.
Volume: Vol. 14, Issue 16
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Keskinen, H., Dalirian, M., Virtanen, A., Laaksonen, A., Riipinen, I., Ahlm, L.,...Ylisirniö, A. (2014). Ccn Activation of Fumed Silica Aerosols Mixed with Soluble Pollutants : Volume 14, Issue 16 (08/09/2014). Retrieved from

Description: Department of Applied Environmental Science (ITM) and the Bolin Centre for Climate research, Stockholm University, Stockholm, Sweden. Particle-water interactions of completely soluble or insoluble particles are fairly well understood but less is known of aerosols consisting of mixtures of soluble and insoluble components. In this study, laboratory measurements were performed to investigate cloud condensation nuclei (CCN) activity of silica particles coated with ammonium sulphate (a salt), sucrose (a sugar) and bovine serum albumin known as BSA (a protein). In addition, the agglomerated structure of the silica particles was investigated by estimating the surface equivalent diameter based on measurements with a Differential Mobility Analyzer (DMA) and an Aerosol Particle Mass Analyzer (APM). By using the surface equivalent diameter the non-sphericity of the particles containing silica was accounted for when estimating CCN activation. Furthermore, characterizing critical supersaturations of particles consisting of pure soluble on insoluble compounds using existing frameworks showed that the CCN activation of single component particles was in good agreement with Köhler and adsorption theory based models when the agglomerated structure was accounted for. For mixed particles the CCN activation was governed by the soluble components, and the soluble fraction varied considerably with particle size for our wet-generated aerosols. Our results confirm the hypothesis that knowing the soluble fraction is the key parameter needed for describing the CCN activation of mixed aerosols, and highlight the importance of controlled coating techniques for acquiring a detailed understanding of the CCN activation of atmospheric insoluble particles mixed with soluble pollutants.

CCN activation of fumed silica aerosols mixed with soluble pollutants

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