Influence of ZrO2 Nanoparticles Including SDS and CTAB Surfactants Assembly on the Interfacial Properties of Liquid-Liquid, Liquid-Air and Liquid-Solid Surface Layers
This work investigates the effects of nanometric (5-8 nm) ZrO2 nanoparticles on adsorption of two surfactants, SDS (sodium dodecyl sulfate) and C12TAB (dodecyl trimethyl ammonium bromide) into oil/water, air/water and solid/water interfaces. Increasing the concentration of nanoparticles reduces the interfacial tension and surface tension of SDS at low surfactant concentration (< cmc) but it has a minor effect on interfacial and surface tension of C12TAB. Repulsive columbic interactions between SDS molecules and nanoparticles can cause the higher adsorption of surfactant at the oil/water interface. Adsorption of both surfactants on carbonate rock increases by adding nanoparticles to the system. This possibly happened because of the formation of surfactant-nanoparticle negatively charged aggregates that tend to adsorb on positively charged surface layer of carbonate rock. ZrO2 nanoparticles are surface active at the oil/water interface too, as the results of interfacial tension indicate they can decrease the n-heptane/water IFT about 14 units.
Prof. Andreas Öchsner, Prof. Irina V. Belova and Prof. Graeme E. Murch
P. Esmaeilzadeh et al., "Influence of ZrO2 Nanoparticles Including SDS and CTAB Surfactants Assembly on the Interfacial Properties of Liquid-Liquid, Liquid-Air and Liquid-Solid Surface Layers", Journal of Nano Research, Vol. 21, pp. 15-21, 2013