Influence of conformational free energy of hydrocarbon chains on adsorption of nonionic surfactants at the air/solution interface

Article Abstract:

A new manner of describing the effect of hydrophobic chains on surfactant adsorption based on the explicit formula considering the conformational free energy of surfactant tails adsorbed at an interface is suggested. The model was employed in describing adsorption isotherms of homologous series of dimethyl-n-alkyl phosphine oxides with the alkyl chain length of 7-13 carbon atoms. The resulting isotherm provides a better description of experimental data for the dependence of surface tension of the homologous series of dimethyl-n-alkyl phosphine oxides on their concentration in solution than the usual description in terms of Frumkin isotherm.

Analysis, Hydrocarbons, Surface chemistry

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Surface tension and surface potential of Na n-dodecyl sulfate at the air-solution interface: model and experiment

Article Abstract:

Research was conducted to examine the surface tension and surface potential of Na n-dodecyl sulfate at the air-solution interface using the vibrating plate technique at various concentrations of added salt. Results suggest that the pronounced minimum takes place within the concentration range that corresponds to the transition from the Henry regime of adsorption to the one typical for adsorption of amphiphiles. Results are described in terms of three theoretical models of adsorption of ionic surfactants at the air-solution interface.

Surface tension, Sulfates

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The effect of inhibition of molecular reorientation and the resulting consequences for the dilational elastic modulus

Article Abstract:

The propagation of thermally excited capillary waves on the surface of a surfactant solution was examined using surface light scattering.

Usage, Light scattering

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