Effects of dodecanol on the adsorption kinetics of SDS at the water-hexane interface

► The “natural” impurity C12OH (dodecanol) in sodium dodecyl sulphate (SDS) solutions have much less effects on the water-oil interfaces in comparison with water-air interface. ► Complementary experiments via direct admixture of dodecanol in hexane indicate negligible effects on interfacial tension at the water-hexane interface for concentrations up to 10−3 mol/l in hexane. ► However for higher concentration significant effects appear. This condition may happen when the oil phase is formed as a small droplet in a high concentrated solution of SDS.