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HERO ID
3457694
Reference Type
Journal Article
Title
The Reactive-Diffusive Length of OH and Ozone in Model Organic Aerosols
Author(s)
Lee, L; Wilson, K
Year
2016
Is Peer Reviewed?
1
Journal
Journal of Physical Chemistry A
ISSN:
1089-5639
EISSN:
1520-5215
Volume
120
Issue
34
Page Numbers
6800-6812
Language
English
PMID
27509443
DOI
10.1021/acs.jpca.6b05285
Web of Science Id
WOS:000382596800016
Abstract
A key step in the heterogeneous oxidation of atmospheric aerosols is the reaction of ozone (O3) and hydroxyl radicals (OH) at the gas-particle interface. The formation of reaction products and free radical intermediates and their spatial distribution inside the particle is a sensitive function of the length over which these oxidants diffuse prior to reaction. The reactive-diffusive length of OH and ozone at organic aerosol interfaces is determined by observing the change in the effective uptake coefficient for size-selected model aerosols comprising a reactive core and a thin nanometer-sized (0-12 nm) organic shell. The core and shell materials are selected so that they are immiscible and adopt an assumed core-shell configuration. The results indicate a reactive-diffusive length of 1.4 nm for hydroxyl (OH) radicals in squalane and 1.0 nm for ozone in squalene. Measurements for a purely diffusive system allow for an estimate for diffusion constant (1.6 × 10(-6) cm(2)/s) of ozone in squalane to be determined. The reactive-diffusive length offers a simple first order estimate of how shielding of aerosols by immiscible layers can alter estimates of oxidative lifetimes of aerosols in the atmosphere.
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