Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

A Study on the Volumetric and Rheological Properties of Binary Mixtures of [bmim]PF6 Ionic Liquid and Aromatic Compounds

Document Type : Research Article

Authors
Majid Moosavi
Fatemeh Zangi
Department of Physical Chemistry, Faculty of Chemistry, University of Isfahan, Isfahan, I.R. IRAN
Abstract
In this work, some thermophysical and transport properties of binary mixtures of ionic liquid 1- butyl -3- methyl imidazolium hexafluoro phosphate ([bmim] PF6) with some aromatic compounds, i.e. toluene and paraxylene, were measured and analyzed. The temperature and composition dependencies of the density and viscosity have been studied in these mixtures. Also, the dependence of viscosity on the shear rate were investigated. The small intercepts of plots of viscosity versus shear rate show that the studied mixtures are moderately non-Newtonian fluids. The viscosities of these mixtures are quadratic functions of temperature. This fact shows that the studied fluids have non-Arrhenius behavior. Temperature dependence of viscosity data was fitted using four known equations, namely, Power-law, Litovitz, VFT, and Ghatee et al. equations. Also, the activation thermodynamic parameters of these mixtures were calculated. The positive values of Gibbs free energy of activation show that the slip of two layers of the fluid is a non-spontaneous process. The composition dependence of these mixtures are fitted well with McAlister equation.
Keywords
Ionic liquid
Aromatic compound
Density
Viscosity
Activation thermodynamic property
Binary mixture
Co-solvent

Subjects

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