Journal
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
Volume 35, Issue 12, Pages 1717-1726Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01932691.2013.871554
Keywords
Diffusion coefficient; dynamic light scattering; dynamic surface tension; mixed surfactant systems; nonionic surfactants; small angle neutron scattering; surface excess
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The adsorption behavior of binary mixtures comprising nonionic surfactants at the air-water interface has been studied by bubble pressure tensiometry at concentrations above and below their critical micelle concentrations. Surfactants with the same hydrocarbon chains but different degree of ethoxylations were chosen as the components to understand their mixing behavior at equilibrium and dynamic conditions. At short times, the adsorption is found to be diffusion limited for individual components as well as for the mixtures, as predicted by the Ward and Tordai model. The effective diffusion coefficient of the monomers in the mixed state displays a dynamic synergism, consistent with the molecular thermodynamic model for dynamic surface tension. However, the equilibrium surface tension and micellar diffusion coefficient of the mixtures exhibit ideal behavior.
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