Evaporation kinetics of aqueous acetic acid droplets: effects of soluble organic aerosol components on the mechanism of water evaporation

被引：28
|
作者：
Duffey, Kaitlin C. [1 ,2 ]
Shih, Orion [1 ,2 ]
Wong, Nolan L. [1 ]
Drisdell, Walter S. [3 ]
Saykally, Richard J. [1 ,2 ]
Cohen, Ronald C. [1 ,4 ]
机构：
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA
[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA
[4] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 28期
基金：
美国国家科学基金会;
关键词：
MASS ACCOMMODATION COEFFICIENT; MOLECULAR-DYNAMICS SIMULATIONS; SUM-FREQUENCY SPECTROSCOPY; LIQUID-GAS INTERFACE; CONDENSATION COEFFICIENT; CARBOXYLIC-ACIDS; GROWTH-KINETICS; CLOUD DROPLETS; SURFACE; VAPOR;
D O I：
10.1039/c3cp51148k
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The presence of organic surfactants in atmospheric aerosol may lead to a depression of cloud droplet growth and evaporation rates affecting the radiative properties and lifetime of clouds. Both the magnitude and mechanism of this effect, however, remain poorly constrained. We have used Raman thermometry measurements of freely evaporating micro-droplets to determine evaporation coefficients for several concentrations of acetic acid, which is ubiquitous in atmospheric aerosol and has been shown to adsorb strongly to the air-water interface. We find no suppression of the evaporation kinetics over the concentration range studied (1-5 M). The evaporation coefficient determined for 2 M acetic acid is 0.53 +/- 0.12, indistinguishable from that of pure water (0.62 +/- 0.09).
引用
收藏
页码：11634 / 11639
页数：6
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