On the factor in Gibbs equation for ionic surfactants

Article Abstract:

A study to clarify the nature of the interfacial properties of fluids where the selection of the adsorption layers of soluble surfactants therefore assumes significance. The experiment evaluated the factor m in Gibbs equation for a cationic soluble surfactant. The experimental findings which are discussed can be explained by a coupling of cation and anion within the surface layer and should hold for many other surfactant systems.

Ion exchange, Adsorption, Surface chemistry, Fluids

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On the internal structure of an adsorption layer of an ionic soluble surfactant. The buildup of stern layer monitored by optical means.

Article Abstract:

The widely accepted Stern model of an adsorption layer of an ionic surfactant at the air-water interface consists of a charged topmost amphilic monolayer, the estimation of to what extent ions enter the compact layer and reduce the surface potential. Simulations reveal that the effect of optical anisotropy within the layer on the ellipsometric signal is negligible as compared to the effect of a changing ion distribution.

Simulation methods, Simulation

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Coexistence of spheres and rods in micellar solution of dodecyldimethylamine oxide

Article Abstract:

Micelles of dimethyldodecylamine oxide (DMDAO) are known to exhibit sphere-to-rod transitions as a function of pH and ionic strength. Dynamic light scattering (DLS) was used to follow particle size distribution as a function of pH, ionic strength, and surfactant concentration, and the key finding was the coexistence of spherical micelles with rodlike ones at 4 < pH < 6 and I > 0.2 M.

Micelles, Electrochemistry, Light scattering

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