The ability of airborne particles to take up water may be
enhanced by surface-active components, but the importance
of this effect is controversial because direct measurement of
the surface tension of microscopic droplets has not been possible.
Here we infer droplet surface tension from water
uptake measurements of mixed organic-inorganic particles
at relative humidities just below saturation (99.399.9%).
The surface tension of droplets formed on particles composed
of NaCl and a-pinene ozonolysis products was
reduced by 5075%, but only when enough organic material
was present to form a film on the droplet surface at least
0.8 nm thick. This study suggests that if atmospheric particles
are predominantly (?80%) composed of surface-active
material, their influence on cloud properties and thus climate
could be enhanced, and their atmospheric lifetimes could be
reduced. Citation: Ruehl, C. R., P. Y. Chuang, A. Nenes, C. D.
Cappa, K. R. Kolesar, and A. H. Goldstein (2012), Strong evidence
of surface tension reduction in microscopic aqueous droplets, Artium PDI-FP 双量程可机载飞行探头 激光相位多普勒干涉仪LDV，PDI，PDPA，PDA 激光诱导白炽光（LII）烟气分析仪
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