A group contribution method for the influence of the temperature in the viscosity of magnetic ionic liquids

• Published in: Fluid phase equilibria Vol. 360; pp. 29 - 35
• Main Authors: Daniel, C.I., Albo, J., Santos, E., Portugal, C.A.M., Crespo, J.G., Irabien, A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.12.2013
• Subjects: Group contribution model; Magnetic ionic liquids; Temperature influence; Viscosity; [P66614]2[CoCl4]; MPD; Viscosity; [CoCl4]2; IL; RTILs; VFT; mVFT; [MnCl4]2; FeCl4; [GdCl6]3; Magnetic ionic liquids; Temperature influence; [P66614][FeCl4]; MIL; Group contribution model; [P66614]3[GdCl6]; [P66614]2[MnCl4]; P66614
• ISSN: 0378-3812; 1879-0224
• DOI: 10.1016/j.fluid.2013.08.031

•A first experimental approach to the influence of the temperature in magnetic ionic liquids has been described by the Orrick–Erbar equation.•A group contribution method is developed to describe the influence of the temperature in the viscosity of MILs.•The effect of temperature in the MILs viscosity is more significant in the anions than for the cations. Ionic liquids are widely under research due to their potential properties as solvents. The prediction of their physicochemical properties is an important strategy to achieve a better knowledge for further applications. The present work applies a group contribution method to estimate the viscosity at different temperatures of a new generation of ionic liquids, magnetic ionic liquids (MILs), which are comprised by anions containing transition metal complexes. These new substances have received a high interest due to their response at the presence of a magnetic field. In this study the magnetic ionic liquids are based on the phosphonium cation [P66614]+ with different chain lengths and on the magnetic anions: [GdCl6]3−, [MnCl4]2−, [FeCl4]− and [CoCl4]2−. The database covers a wide range of temperature, 293.15–373.15K, and viscosity 44–123500cP. The modelling estimations show a good agreement with the experimental results, presenting a mean percentage deviation of 7.64%. These results confirm the interest of this model for the estimation of viscosity and the influence of the temperature, which can be extended for a large variety of group combinations in magnetic ionic liquids leading to different applications.