dynamic and equilibrium interfacial tension behavior of crude oil-water in the presence of [c4im-c8-imc4][br2] imidazolium gemini ionic liquid

In this study, the functionality of [c8im-c4-imc8][br2] gemini imidazolium ionic liquid (il), as a new surfactant, on the equilibrium and dynamic interfacial tensions of crude oil-water was investigated# different il concentrations and temperatures were applied# results showed a drastic reduction in equilibrium interfacial tension with the used gemini ionic liquid due to its strong amphiphilic nature and thus, providing high interfacial activity# the highest percentage of the ift reduction was 97#8% at the critical micelle concentration of 0#20 mol dm−3# temperature intensified this effect due to weakening the molecular forces between phases# the maximum decrease with temperature was about 15#2% for the lowest il concentration and temperature effect was not significant at high il concentrations, close to cmc# also, both the il concentration and temperature had effect on the dynamic interfacial tension and by increasing concentration, the required time to reach the equilibrium ift was increased; however, at higher temperatures this time will be shortened#