Dynamic Surface Tension and Adsorption Kinetics from Micellar Solutions on Planar Surfaces

✍ Scribed by Leonid K. Filippov; Nadezhda L. Filippova

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 213 KB
• Volume: 187
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1996.4701

✦ Synopsis

A qualitative theory of the dynamic surface tension and adsorption kinetics from micellar surfactant solutions on a planar surface is developed for the kinetic-diffusive-controlled adsorption process obeying any adsorption kinetics on a planar surface and any micellization-demicellization kinetics in the bulk. The time-dependent adsorption and dynamic surface tension is obtained in an analytical form for short and long times. It is shown that the adsorption process and dynamic surface tension over a wide range of surfactant (monomer) concentrations is governed by: (I) the adsorption kinetics of monomers and micelles for short times (0 /= tcr2). Formulas were derived to estimate the relaxation times tcr1, tcr2, and the parameters characterizing the adsorption process over a wide range of times. The existence of the (I), (II), and (III) regimes are justified by using the experimental data for the dynamic surface tension of a micellar Brij 58 solution.