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Surfactant properties of atmospheric and model humic‐like substances (HULIS)
Author(s) -
Taraniuk Ilya,
Graber Ellen R.,
Kostinski Alex,
Rudich Yi
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl029576
Subject(s) - aerosol , surface tension , pulmonary surfactant , diffusion , adsorption , environmental chemistry , environmental science , chemistry , thermodynamics , organic chemistry , physics , biochemistry
Surface‐active organics such as humic‐like substances (HULIS) are abundant in aerosol particles and can lower the surface tension of cloud droplets forming on secondary organic and biomass burning aerosols. How fast is the diffusion of these species, relative to the time scale of cloud droplet growth? Here we report surface tension measurements of solutions containing HULIS extracted from smoke and pollution aerosol particles as well those of molecular weight‐fractionated aquatic fulvic acids. Diffusion coefficients are estimated based on the Gibbs adsorption isotherms. The results suggest that HULIS diffusion to the surface of forming droplets is typically more rapid than the time scale of droplet growth so that cloud microphysical properties are affected.