Abstract
A special measuring cell modifies the maximum bubble pressure tensiometer MPT1 to a drop volume apparatus which allows us to analyze the stability of the formation of single drops and to detect instabilities as observed recently in the form of drop volume bifurcations. This modified apparatus was used to study the adsorption kinetics of different Tritons (X-45, X-100, X-165, and X-405) at the water−nonane interface. The results of the measured dynamic interfacial tensions for long adsorption times are fully in line with a diffusion-controlled adsorption model. The short adsorption time data show adsorption rates faster than expected from diffusion, which may be caused by reorientation processes of the Triton molecules at low interfacial coverage. The experiments performed under different conditions (Triton dissolved in water, in nonane, or in both phases, respectively) allow us to estimate the distribution coefficient of the Tritons between water and oil, which increases with a decrease in the number of EO groups.
Published Version
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