Abstract
The present study reports the effects of non-ionic surfactant Pluronic F-127 on the equilibrium and dynamic oil-water interfacial tension in the presence of ZnO nanoparticles. The results show that in the presence of nanoparticles, the decrease of interfacial tension is more. The cooperative behavior of F-127 and ZnO nanoparticles especially at low concentrations increases the surfactant efficiency in lowering the interfacial tension. Statistical rate theory (SRT) and mixed diffusion-kinetic controlled model were used for modeling the dynamic interfacial tension data. The modeling results show that the mechanism of surfactant adsorption is controlled with the mixed diffusion-kinetic model. In addition, the influence of the solution pH on the interfacial tension was investigated. Finally, the effects of F-127 on the contact angle in the absence and presence of ZnO was compared.
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