Ionic liquids (ILs) are a new kind of solvents that have recently gained an upsurge in attention in
light of their unique potential for different applications. With respect to this, in the present study,
applicability of an IL called 1-octadecyl-3-methylimidazolium chloride ([C18mim] [Cl]) as a new
class of surfactant was investigated. Different interfacial tension (IFT) measurements were
performed to find the effect of IL concentration and temperature on the IFT of water/crude oil
system. The observed trend was explained based on mass transfer mechanisms including diffusion
and convective mass transfer. In addition, the effect of rotational speed, ranging between 3000
and 9000 rpm, on the IFT was examined with the hypothesis that it can modify the convective
mass transfer. Finally, since it has been reported that the Marangoni effect enhances the mass
transfer flux in the surfactant solutions, two different methods of IFT measurements including
the spinning drop and pendant drop methods were applied to investigate the effects of convective
mass transfer on the equilibrium IFT.
کلید واژگان :
1-Octadecyl-3-methylimidazolium chloride, interfacial tension, ionic liquid, pendant drop, spinning drop
