Direct Determination of the Distribution Coefficient of Tridecyl Dimethyl Phosphine Oxide between Water and Hexane

V. B. Fainerman, Altynay A. Sharipova, Saule B. Aidarova, V.I. Kovalchuk, E.V. Aksenenko, Alexander V. Makievski, R. Miller

2018

Full text Open access: Gold Metadata (CSL-JSON)

DOI 10.3390/colloids2030028

Data confidence 70 medium

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Abstract

Drop profile analysis tensiometry is applied to determine the distribution coefficient of a nonionic surfactant for a water/hexane system. The basic idea is to measure the interfacial tension isotherm in two configurations: a hexane drop immersed in the surfactant aqueous solutions at different bulk concentrations, and a water drop immersed into a hexane solution of the same surfactant. Both types of experiments lead to an isotherm for the equilibrium interfacial tensions with the same slope but with a concentration shift between them. This shift refers exactly to the value of the distribution coefficient.