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On the Mixing and Evaporation of Secondary Organic Aerosol Components

Loza, Christine L. and Coggon, Matthew M. and Nguyen, Tran B. and Zuend, Andreas and Flagan, Richard C. and Seinfeld, John H. (2013) On the Mixing and Evaporation of Secondary Organic Aerosol Components. Environmental Science and Technology, 47 (12). pp. 6173-6180. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20130816-104202754

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Abstract

The physical state and chemical composition of an organic aerosol affect its degree of mixing and its interactions with condensing species. We present here a laboratory chamber procedure for studying the effect of the mixing of organic aerosol components on particle evaporation. The procedure is applied to the formation of secondary organic aerosol (SOA) from α-pinene and toluene photooxidation. SOA evaporation is induced by heating the chamber aerosol from room temperature (25 °C) to 42 °C over 7 h and detected by a shift in the peak diameter of the SOA size distribution. With this protocol, α-pinene SOA is found to be more volatile than toluene SOA. When SOA is formed from the two precursors sequentially, the evaporation behavior of the SOA most closely resembles that of SOA from the second parent hydrocarbon, suggesting that the structure of the mixed SOA resembles a core of SOA from the initial precursor coated by a layer of SOA from the second precursor. Such a core-and-shell configuration of the organic aerosol phases implies limited mixing of the SOA from the two precursors on the time scale of the experiments, consistent with a high viscosity of at least one of the phases.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es400979k DOIArticle
http://pubs.acs.org/doi/abs/10.1021/es400979kPublisherArticle
ORCID:
AuthorORCID
Coggon, Matthew M.0000-0002-5763-1925
Zuend, Andreas0000-0003-3101-8521
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2013 American Chemical Society. Received: March 4, 2013; Revised: May 15, 2013; Accepted: May 20, 2013; Published: May 31, 2013. This work was supported by the Office of Science (Biological and Environmental Research), US Department of Energy Grant DE-SC 0006626. We thank Jill Craven, Rebecca Schwantes, Lindsay Yee, and Xuan Zhang for experimental assistance, Andrew Metcalf and Manabu Shiraiwa for helpful discussions, and Yu Jun Leong and Robert Griffin for lending us their AMS power supply.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0006626
Issue or Number:12
Record Number:CaltechAUTHORS:20130816-104202754
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130816-104202754
Official Citation:On the Mixing and Evaporation of Secondary Organic Aerosol Components Christine L. Loza, Matthew M. Coggon, Tran B. Nguyen, Andreas Zuend, Richard C. Flagan, and John H. Seinfeld Environmental Science & Technology 2013 47 (12), 6173-6180
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40706
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Aug 2013 19:44
Last Modified:03 Oct 2019 05:41

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