Nonlinear Spontaneous Oscillations at the Liquid/Liquid Interface Produced by Surfactant Dissolution in the Bulk Phase

摘要

The results of theoretical and experimental studies of spontaneous nonlinear oscillations produced at the liquid/liquid interface by surfactant transfer from a point source situated in one of the bulk phases are presented.The theoretical analysis is based on the direct numerical simulation of the system evolution.The experiments are performed for the heptane/water interface using middle-chain aliphatic alcohols as surfactants.The results for the oil/water interface are compared with the corresponding data obtained for the air/water interface.The presented results allow the conclusion that auto-oscillations at the air/liquid and liquid/liquid interfaces are governed by very similar mechanisms but their characteristics are strongly dependent on the properties of the two contacting media,in particular,on the surfactant partition coefficient.