Adsorption kinetic characterization of the effect of surface-active trace components in aqueous solutions of surfactants

✍ Scribed by D. Vollhardt; M. Ziller

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 810 KB
• Volume: 76
• Category: Article
• ISSN: 0927-7757
• DOI: 10.1016/0927-7757(93)80080-x

✦ Synopsis

The diffusion-controlled adsorption kinetics of a multicomponent surfactant system can be calculated on the basis of a collocation solution for the case of a Langmuir isotherm. By introducing effective bulk-surface distribution coefficients, at any instant each component can be considered as a single component.

For two-component surfactant adsorption, the transients of the surface tension and the surface concentrations of both components have been calculated using a stepwise solution with variable surface activities. An approximation and an estimation simplifying the calculation procedure are presented and their validity is discussed.

The experimental data on the surface tension transients of aqueous solutions containing a surfactant as the main component and a minor component of much higher surface activity were described reasonably well by the theoretical model.