This study explored the effect of [C12mim][Cl] ionic liquid on the equilibrium and dynamic interfacial tensions (IFTs) of n-heptane/water as a typical demonstrative model of oil/water system. The IL and themagnetite nanoparticles were synthesized and characterized in different ways including FTIR, 1HNMR, 13CNMR,mass spectrometry, SEM, TEM, DLS and XRD. The ionic liquid by itself caused an IFT reduction of 85.3% at critical micelle concentration of 0.025 mol/L and presence of nanoparticles intensified this effect, stronger under alkaline pHs. It was while nanoparticles alone had no considerable effect. The results of equilibrium IFT were nicely fitted with the Szyszkowski equation, and corresponding parameters were obtained. From dynamic IFT variations, it was found that the ionic liquid migrationwas adaptedwith the mixed diffusion frombulk to the interface. Therefore, the apparent diffusivity and the activation energy were obtained. Also, the stability of oil/water emulsions was increased in the simultaneous presence of the IL and nanoparticles. Confirming the results, the static contact angle of aqueous phase droplets surrounded by organic phase on the surface of quartzwas raised in the presence of nanoparticles.
