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Adsorption Kinetics of Surfactants at Fluid-Fluid Interfaces

Summary: Adsorption Kinetics of Surfactants
at Fluid-Fluid Interfaces
Haim Diamant and David Andelman
School of Physics and Astronomy
Raymond and Beverly Sackler Faculty of Exact Sciences
Tel Aviv University, Ramat Aviv, 69978 Tel Aviv, Israel
Progr. Colloid Polym. Sci. 103, 51-59 (1997)
Keywords: Fluid-Fluid Interfaces, Adsorption, Adsorption Kinetics, Interfacial Tension.
We review a new theoretical approach to the kinetics of surfactant adsorption at
fluid-fluid interfaces. It yields a more complete description of the kinetics both in
the aqueous solution and at the interface, deriving all equations from a free-energy
functional. It also provides a general method to calculate dynamic surface tensions.
For non-ionic surfactants the results coincide with previous models. Common non-
ionic surfactants are shown to undergo diffusion-limited adsorption, in agreement
with experiments. Strong electrostatic interactions in salt-free ionic surfactant so-
lutions are found to lead to kinetically limited adsorption. In this case the theory
accounts for unusual experimental results which could not be understood using pre-
vious approaches. Added salt screens the electrostatic interactions and makes the


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


Collections: Materials Science; Physics