Modification of cloud condensation nucleus activity of organic aerosols by hydroxyl radical heterogeneous oxidation

被引：39

作者：

George, I. J. ^{[1
]}

Chang, R. Y. -W. ^{[1
]}

Danov, V. ^{[1
]}

Vlasenko, A. ^{[1
]}

Abbatt, J. P. D. ^{[1
]}

机构：

[1] Univ Toronto, Dept Chem, Toronto, ON M5S 3H6, Canada

来源：

ATMOSPHERIC ENVIRONMENT | 2009年 / 43卷 / 32期

基金：

加拿大自然科学与工程研究理事会;

关键词：

OH; CCN; Chemical aging; Surface tension; HUMIC-LIKE SUBSTANCES; SURFACE-TENSION; ACTIVATION; KINETICS; WATER; ACIDS; DENSITY; CCN;

D O I：

10.1016/j.atmosenv.2009.06.043

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The modification of cloud condensation nucleus (CCN) activity of saturated organic particles resulting from heterogeneous oxidation by OH radicals was studied. Submicron Bis-2-ethylhexyl sebacate (BES) and stearic acid particles were exposed to OH radicals in a reactor flow tube and CCN activity was monitored. The hygroscopicity parameter, K, for monodisperse stearic acid and BES particles of 145-150 nm in size increased from <0.008 up to 0.08 as a result of OH exposures equivalent to atmospheric exposure timescales of several days to a week. The oxidation of stearic acid particles led to a 50% reduction in particle volume at high CH exposures, indicating an enhanced degree of volatilization of oxidation products compared to oxidized BES particles, along with possible shape/phase change. Surface tension measurements of water extracts of oxidized BES films showed a significant reduction in surface tension due to oxidation. Kohler calculations modeling the CCN measurements suggest that the surface active oxidation products play an important role. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.

引用

页码：5038 / 5045

页数：8

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