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The adsorption kinetics of the non-ionic surfactant C 10  E 4  was studied by maximum bubble pressure (MPT-2) and drop/bubble shape analysis tensiometry (PAT-1). The two methods complement each other and show good agreement in the overlapping time range if the problem of the so-called initial load at the drop/bubble surface is considered properly. The adsorption appears to be diffusion-controlled, giving an average diffusion coefficient of the order of 110 −10  m 2  s −1 . At higher surfactant concentrations, the adsorption rate tends to change to a non-diffusional mechanism, which is possibly caused by surface active impurities.

Revision of the Adsorption Behavior of the Non-ionic Surfactant Tetraoxyethylene Decylether C 10 E 4 at the Water/Air Interface