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Abstract
Water-in-crude oil emulsions are stabilised by the natural surfactants present in the crude oil. The Theological properties of the interface have often been mentioned to control the stability and demulsification of such emulsions. In this work, dynamic interfacial tension at the crude oil / water interface and dilational modulus of such systems have been studied by using a microprocessor controlled drop-volume interfacial tension measurement apparatus and micro videography.