Kinetics of surfactant adsorption at fluid/fluid interfaces: non-ionic surfactants
School of Physics and Astronomy,
Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University -
Ramat Aviv, Tel Aviv 69978, Israel
Accepted: 22 April 1996
We present a model treating the kinetics of adsorption of soluble surface-active molecules at the interface between an aqueous solution and another fluid phase. The model accounts for both the diffusive transport inside the solution and the kinetics taking place at the interface using a free-energy formulation. In addition, it offers a general method of calculating dynamic surface tensions. Non-ionic surfactants are shown, in general, to undergo a diffusion-limited adsorption, in accord with experimental findings.
PACS: 68.10.Jy – Kinetics (evaporation, adsorption, condensation, catalysis, etc.) / 68.10.Cr – Surface energy (surface tension, interface tension, angle of contact, etc.) / 82.65.Dp – Thermodynamics of surfaces and interfaces
© EDP Sciences, 1996