By comparing the dynamic interfacial tension(DIFT)of oil/alkali and oil/alkali-surfactant,it was found that,compared with O/A system,the interfacial tension of O/AS system was higher at lower alkaline concentration and lower at higher alkaline concentration.It was also found that OH-played an important role in increasing oil/Alkali interfacial tension by comparing the DIFTminof Oil/NaOH and oil/NaOH-NaCl under similar ionic concentration.It was also observed that the amount of oil components diffusing into ...