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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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.
|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.|
|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.|
|Deposited By:||Tony Diaz|
|Deposited On:||25 Jun 2013 23:59|
|Last Modified:||24 Mar 2014 19:29|
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