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Updated: Jun 24, 2026

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
Published on: September 9, 2022
Sodium lauryl sulphate/amphoteric surfactant interactions: selective diffusion through a collagen film
X Domingo1, B M Phillips, J S Leal
1Albright & Wilson Ltd, Albright & Wilson House, P.O. Box 3, Hagley Road West, Oldbury, Warley, West Midlands, B68 0NN, UK.
Abstract:
Synopsis Diffusion tests of anionic, amphoteric and mixtures of amphoteric/anionic surfactants have been performed using a collagen film. A sensitive potentiometric method has been developed to determine the surfactant diffused avoiding the interferences observed in the usual analytical measurements due to the simultaneous presence of amphoteric/anionic surfactants. From the results obtained it is evident that the surfactant mixtures exhibit a synergistic behaviour as there is a mutual inhibition of the surfactant diffused through the collagen film. Empirical equations have been derived to describe the diffusion process of both the individual surfactants and mixtures of surfactants which allow the diffusion of the individual surfactants and the inhibition of diffusion in mixtures to be quantified.
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A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...

