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Gas-particle partitioning of atmospheric aerosols: interplay of physical state, non-ideal mixing and morphology

Shiraiwa, Manabu and Zuend, Andreas and Bertram, Allan K. and Seinfeld, John H. (2013) Gas-particle partitioning of atmospheric aerosols: interplay of physical state, non-ideal mixing and morphology. Physical Chemistry Chemical Physics, 15 (27). pp. 11441-11453. ISSN 1463-9076. http://resolver.caltech.edu/CaltechAUTHORS:20130613-081545477

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Abstract

Atmospheric aerosols, comprising organic compounds and inorganic salts, play a key role in air quality and climate. Mounting evidence exists that these particles frequently exhibit phase separation into predominantly organic and aqueous electrolyte-rich phases. As well, the presence of amorphous semi-solid or glassy particle phases has been established. Using the canonical system of ammonium sulfate mixed with organics from the ozone oxidation of α-pinene, we illustrate theoretically the interplay of physical state, non-ideality, and particle morphology affecting aerosol mass concentration and the characteristic timescale of gas–particle mass transfer. Phase separation can significantly affect overall particle mass and chemical composition. Semi-solid or glassy phases can kinetically inhibit the partitioning of semivolatile components and hygroscopic growth, in contrast to the traditional assumption that organic compounds exist in quasi-instantaneous gas–particle equilibrium. These effects have significant implications for the interpretation of laboratory data and the development of improved atmospheric air quality and climate models.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c3cp51595hDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2013/CP/c3cp51595hPublisherArticle
Additional Information:© 2013 the Owner Societies. Received 14 Apr 2013, Accepted 29 May 2013. First published online 29 May 2013. This work was funded by US National Science Foundation grant AGS-1057183. MS was supported by the Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowship for Research Abroad.
Funders:
Funding AgencyGrant Number
NSFAGS-1057183
Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellowship for Research AbroadUNSPECIFIED
Record Number:CaltechAUTHORS:20130613-081545477
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130613-081545477
Official Citation:Shiraiwa, M., A. Zuend, et al. (2013). "Gas-particle partitioning of atmospheric aerosols: interplay of physical state, non-ideal mixing and morphology." Physical Chemistry Chemical Physics 15(27): 11441-11453.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38934
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:25 Jun 2013 23:59
Last Modified:24 Mar 2014 19:29

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