Effect of electrolyte on interfacial dilational properties of chemical flooding systems by relaxation measurements

► Only single reorientation process dominates the interfacial properties in the presence of any electrolyte for 1 × 10−6 mol L−1 377 solution. ► In the case of Gemini surfactant, the contribution of reorientation process at higher frequency decreases after the addition of electrolyte. ► The addition of polymer can significantly modify the dilational properties of adsorbed surfactant layer. ► The normalized Cole-Cole plots of surfactant-polymer films with different types of electrolytes show the similar characteristic.