Desorption of ionic-surfactants at liquid/liquid interface

Dynamic interfacial tension at liquid/liquid interface was measured. Surfac tants were supplied to the measured point by a transverse mass-transfer ind uced by Marangoni instability, and we could make a local interface with sur factants where adjacent bulk phases contained almost no surfactant, The dyn amics were dominated by desorption kinetics. A simple model was proposed to explain the results. Attractive interaction between surfactants at the int erface was estimated by the model and the experiments.