Chemical surfactant injection is one of the EOR (Enhanced Oil Recovery) technologies exhibiting a large potential to recover the undisplaced oil into the porous media. Many techniques to improve this methodology have been proposed recently, such as the use of nanoparticles. However, very few studies have focused on the effect of the surface hydrophobicity of nanoparticles on the surfactant efficiency improvement. Furthermore, most studies focus on the use of a single molecule, but in common field applications, the use of surfactant mixtures is recommended since a lower interfacial tension can be reached.This research work aims to study the use of two different hydrophobicity nanoparticles (Aerosil 308 and Aerosil R812S) to improve an anionic surfactant mix efficiency for EOR processes from the oil/water interfacial reduction and adsorption inhibition. For this purpose, some system stability assays were performed using a direct physical stability analysis equipment and static and dynamic adsorption assessments.Results showed the surface nature of nanoparticles has an effect of the efficiency of oil-water IFT and adsorption behavior of the surfactant mixture. Hydrophilic nanoparticles (Aerosil 380) exhibited a better performance than hydrophobics (Aerosil R812S). Nevertheless, some parameters displayed non monotonic trends, especially in adsorption assessments wherein static and dynamic experiments had different behavior at the same concentrations.