Surfactants undergoing 2D-aggregation

As experimental example, the dependencies of dynamic surface tensions for 1-decanol solutions as reported by Lin et al. [83, 84] are compared in Fig. 4.31 with the results calculated from the present aggregation model. 

To summarise, more experimental data have to be produced to demonstrate the suitability of the aggregation model. However, the given example shows impressively, that this model can 

An interesting experimental example for a diffusion-controlled adsorption process are the data for aqueous solutions of the long-chain alkanol, dodecanol, an extremely sparely soluble surfactant [232]. As one can see in Fig. 4.32, the dynamic surface pressure curves show a distinct kink point. Such points, which is shifted at lower temperatures to shorter times and disappears at higher temperatures, indicate a main phase transition of first order in the adsorption layer. 

The analysis of the adsorption kinetics shows that also the dodecanol adsorbs diffusion-controlled, however, the corresponding adsorption isotherm has to be used which allows to cissume a two-dimensional aggregation at the surface (cf paragraph 2.7). 

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