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Kinetics of Surfactant Adsorption at Fluid-Fluid Interfaces: Surfactant Mixtures

Summary: Kinetics of Surfactant Adsorption at Fluid-Fluid
Interfaces: Surfactant Mixtures
Gil Ariel, Haim Diamant, and David Andelman*
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences,
Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
Received June 29, 1998. In Final Form: December 8, 1998
The adsorption at the interface between an aqueous solution of several surface-active agents and another
fluid (air or oil) phase is addressed theoretically. We derive the kinetic equations from a variation of the
interfacial free energy, solve them numerically, and provide an analytic solution for the simple case of a
linear adsorption isotherm. Calculating asymptotic solutions analytically, we find the characteristic time
scales of the adsorption process and observe the behavior of the system at various temporal stages. In
particular, we relate the kinetic behavior of the mixture to the properties of its individual constituents
and find good agreement with experiments. In the case of kinetically limited adsorption, the mixture
kinetics is found to be considerably different from that of the single-surfactant solutions because of strong
coupling between the species.
1. Introduction
role in various interfacial phenomena and has been an
active field of research, both experimentally and theoreti-
cally, since the 40s.1


Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University


Collections: Materials Science; Physics