General models for adsorption kinetics and relaxations of surfactants

1 General models for adsorption kinetics and relaxations of surfactants 

The present state of resecirch allows to describe the adsorption kinetics of surfactants at liquid interfaces in most cases quantitatively. The first model for interfaces with constant area was derived by Wend Tordai [3]. It is based on the assumption that the time dependence of interfacial tension, which is directly related to the interfacial concentration T of adsorbed molecules via an equation of state, is mainly caused by the surfactant transport to the interface. In the absence of any external influences this transport is controlled by diffusion and the result, the so-called diffusion controlled adsorption kinetics model, has the following form 

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