Abstract
The damping coefficient and the wavelength of ripples on the surface of aqueous solutions of dodecylammonium chloride (DAC) and cetyltrimethylammonium chloride (CTAC) have been measured as a function of frequency and surfactant concentration. For DAC solutions, experimental results are in agreement with the theory of capillary waves if the model of a diffusion-controlled adsorption process is used as the basis of the theoretical description. It appears likely that CTAC follows a diffusion-controlled adsorption mechanism also, but in this case the accuracy of the results is insufficient. For substances with high surface activity, the adsorption kinetics only influence slightly the dynamic surface properties at low frequencies, and the CTAC film behaves as an almost insoluble monolayer during the surface wave propagation.
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