title: Synergistic effect of ZnO nanoparticles and triblock copolymer surfactant on the dynamic and equilibrium oil-water interfacial tension.
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.
authors.affiliation: Department of Physical Chemistry, Faculty of Chemistry, Bu-Ali Sina University, 65147, Hamedan, Iran. sazizian@basu.ac.ir sdazizian@yahoo.com.
authors.forename: Tahereh Fereidooni
authors.initials: TF
authors.lastname: Moghadam
authors.forename: Saeid
authors.initials: S
authors.lastname: Azizian