油水界面膜探测技术的研究

STUDY OF OIL/WATER INTERFACIAL FILM BY TECHNIQUE OF BILAYER LIPID MEMBRANES

应用人造双层膜测定装置研究了油水界面膜随时间变化时膜电阻与电容的变化 ,考察了薄膜的排液机理 ,测定了不同物化条件下的油水界面膜厚度和膜寿命 ,并将油水界面膜寿命与动态界面张力相关联。

By using a technique of bilayer lipid membranes the thin oil film between two similar water phase is studied through measuring film thickness and film life changes in time and through correlating these data with dynamic interfacial tension values. The oil phase used is normal decane with or without a surfactant added(petroleum sulfonate LH and Cy and nonionic surfactant Span 20) and the water phase—NaCl solutions with or without a surfactant added. it is shown that the oil film thickness depends upon the concentration and the species of the surfactant added to the oil and not upon the alkane carbon number of the normal alkane used as simulation oil phase and the ionic strength of the water phase while the oil film life is correlated to the oil/water dynamic tension behavior and changes with changes in the concentration and the species of the surfactant in oil phase and in the ionic strength of water phase. The drainage of the oil film starts only when the dynamic interfacial tension reaches a relatively low value.