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Liquid-liquid phase separation in aerosol particles: Dependence on O:C, organic functionalities, and compositional complexity

Song, M. and Marcolli, C. and Krieger, U. K. and Zuend, A. and Peter, T. (2012) Liquid-liquid phase separation in aerosol particles: Dependence on O:C, organic functionalities, and compositional complexity. Geophysical Research Letters, 39 . Art. No. L19801. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20121109-140101212

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Abstract

Atmospheric aerosol particles may undergo liquid-liquid phase separation (LLPS) when exposed to varying relative humidity. In this study we investigated the occurrence of LLPS for mixtures consisting of up to ten organic compounds, ammonium sulfate, and water in relationship with the organic oxygen-to-carbon (O:C) ratio. LLPS always occurred for O:C < 0.56, never occurred for O:C > 0.80, and depended on the specific types and compositions of organic functional groups in the regime 0.56 < O:C < 0.80. In the intermediate regime, mixtures with a high share of aromatic compounds shifted the limit of occurrence of LLPS to lower O:C ratios. The number of mixture components and the spread of the O:C range did not notably influence the conditions for LLPS to occur. Since in ambient aerosols O:C range typically between 0.2 and 1.0, LLPS is expected to be a common feature of tropospheric aerosols.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2012GL052807DOIArticle
ORCID:
AuthorORCID
Zuend, A.0000-0003-3101-8521
Additional Information:© 2012 American Geophysical Union. Received 19 June 2012; revised 29 August 2012; accepted 4 September 2012; published 5 October 2012. This work was supported by the Swiss National Foundation, project 200020-125151 and by the CCES project IMBALANCE funded by the ETH Domain. The Editor thanks an anonymous reviewer for assisting in the evaluation of this paper.
Funders:
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)200020-125151
CCES project IMBALANCEUNSPECIFIED
ETH Zurich UNSPECIFIED
Subject Keywords:liquid-liquid phase separation
Record Number:CaltechAUTHORS:20121109-140101212
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121109-140101212
Official Citation:Song, M., C. Marcolli, U. K. Krieger, A. Zuend, and T. Peter (2012), Liquid-liquid phase separation in aerosol particles: Dependence on O:C, organic functionalities, and compositional complexity, Geophys. Res. Lett., 39, L19801, doi:10.1029/2012GL052807.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35393
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:09 Nov 2012 22:42
Last Modified:06 Apr 2017 20:16

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