Correlation of interfacial tension with density and dielectric constant for binary systems containing water and an organic component

Abstract

This work proposes a semi-empirical equation for estimating liquid–liquid interfacial tension (γ_ow) of the systems containing water and an organic component by measuring the basic physical quantities (ε_r and ρ). The equation can estimate interfacial tension data for binary systems containing organic compounds with different chemical functions in equilibrium with water. The average absolute deviation (AAD) and the average relative deviation (ARD) of 41 binary systems obtained from this equation were 2.90 mN m⁻¹ and 14.4%, respectively, being close to other predictive equations available in the literature. Overall, compared with the previous equations, the new equation provides a more convenient way to estimate γ_ow and is more suitable for predicting the γ_ow values range of 30 to 60 mN m⁻¹.