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Near-Unity Mass Accommodation Coefficient of Organic Molecules of Varying Structure
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2014 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 48, no 20, 12083-12089 p.Article in journal (Refereed) Published
Abstract [en]

Atmospheric aerosol particles have a significant effect on global climate, air quality, and consequently human health. Condensation of organic vapors is a key process in the growth of nanometer-sized particles to climate relevant sizes. This growth is very sensitive to the mass accommodation coefficient a, a quantity describing the vapor uptake ability of the particles, but knowledge on a of atmospheric organics is lacking. In this work, we have determined a for four organic molecules with diverse structural properties: adipic acid, succinic acid, naphthalene, and nonane. The coefficients are studied using molecular dynamics simulations, complemented with expansion chamber measurements. Our results are consistent with alpha = 1 (indicating nearly perfect accommodation), regardless of the molecular structural properties, the phase state of the bulk condensed phase, or surface curvature. The results highlight the need for experimental techniques capable of resolving the internal structure of nanoparticles to better constrain the accommodation of atmospheric organics.

Place, publisher, year, edition, pages
2014. Vol. 48, no 20, 12083-12089 p.
National Category
Earth and Related Environmental Sciences
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URN: urn:nbn:se:su:diva-109809DOI: 10.1021/es501816hISI: 000343640900041OAI: oai:DiVA.org:su-109809DiVA: diva2:784044
Note

AuthorCount:5;

Available from: 2015-01-28 Created: 2014-12-01 Last updated: 2017-12-05Bibliographically approved

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Julin, JanDonahue, Neil M.Riipinen, Ilona
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