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Colloids and Surfaces A: Physicochemical and Engineering Aspects 183185 (2001) 259276

Summary: Colloids and Surfaces
A: Physicochemical and Engineering Aspects 183­185 (2001) 259­276
Kinetics of surfactant adsorption: the free energy approach
Haim Diamant 1
, Gil Ariel, David Andelman *
School of Physics and Astronomy, Raymond and Be6erly Sackler Faculty of Exact Sciences, Tel A6i6 Uni6ersity, Ramat A6i6,
69978 Tel A6i6, Israel
We review the free energy approach to the kinetics of surfactant adsorption at fluid­fluid interfaces. The formalism
is applied to several systems. For non-ionic surfactant solutions, the results coincide with earlier models while
indicating their limits of validity. We study the case of surfactant mixtures, focusing on the relation between the
mixture kinetics and the properties of its individual constituents. Strong electrostatic interactions in salt-free ionic
surfactant solutions drastically modify the adsorption kinetics. In this case the theory accounts for experimental
results, which could not be earlier understood. The effect of screening by added salt is studied as well. Our theoretical
predictions are compared with available experiments. Š 2001 Elsevier Science B.V. All rights reserved.
Keywords: Surface tension; Adsorption; Surfactants; Interfacial phenomena; Kinetics
1. Introduction
The kinetics of surfactant adsorption is a fun-
damental problem of interfacial science playing a


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


Collections: Materials Science; Physics