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Issue 11, 2018
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Emerging investigator series: exploring the surface properties of aqueous aerosols coated with mixed surfactants

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Abstract

Mixed Langmuir monolayers of cholesterol with both saturated and unsaturated fatty acids, stearic acid (SA), and oleic acid (OA) spread at the air–seawater surface were studied. The phase behavior, molecular interaction, and conformational order of the monolayers were investigated by surface pressure–area (π–A) isotherms and infrared reflection-absorption spectroscopy (IRRAS) measurements. The thermodynamic parameters of the mixed films, including excess molecular area and excess Gibbs free energy were calculated by using the isotherm data. The interaction between SA (or OA) and cholesterol varied with the molar fraction of the fatty acids and surface pressure. OA/chol monolayers showed the characteristics of miscibility, but they acted as nonideal systems. Cholesterol has been observed to have a stabilizing effect on OA monolayers. The negative values of the excess Gibbs free energy in the entire composition range demonstrated that mixed OA/chol monolayers were thermodynamically stable. IRRAS spectra showed that mixing with cholesterol changes the ordering of fatty acid monolayers at the air–seawater surface. The findings provide general information regarding the structural changes in the monolayer induced by lateral packing. These results help in the understanding of the mixing behavior of fatty acids and cholesterol and provide insights into the fate of the mixed-monolayer-coated sea salt aerosol in the ocean environment.

Graphical abstract: Emerging investigator series: exploring the surface properties of aqueous aerosols coated with mixed surfactants

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Publication details

The article was received on 09 Sep 2018, accepted on 15 Oct 2018 and first published on 16 Oct 2018


Article type: Paper
DOI: 10.1039/C8EM00419F
Citation: Environ. Sci.: Processes Impacts, 2018,20, 1500-1511
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    Emerging investigator series: exploring the surface properties of aqueous aerosols coated with mixed surfactants

    J. Li, S. Li, S. Cheng, N. T. Tsona and L. Du, Environ. Sci.: Processes Impacts, 2018, 20, 1500
    DOI: 10.1039/C8EM00419F

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