Excess Molar Volumes, Excess Molar Isentropic Compressibilities, Viscosity Deviations, and Activation Parameters for 1-Ethyl-3-methyl-imidazolium Trifluoro-methanesulfonate + Dimethyl Sulfoxide and/or Acetonitrile at T = 298.15 to 323.15 K and P = 0.1 MPa

Abstract

The densities, ρ, speeds of sound, u, and dynamic viscosities, η, of pure 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, ([EMIM][CF3SO3]), dimethyl sulfoxide, (DMSO), acetonitrile, (ACN), and their binary and ternary mixtures have been measured experimentally over the entire composition range and at temperatures of 298.15, 303.15, 308.15, 313.15, 318.15, and 323.15 K and at a pressure of 0.1 MPa. The excess molar volume, VE, excess molar isentropic compressibility, Ks,mE, viscosity deviations, Δη, Gibbs energy of activation, ΔG*, and excess Gibbs energy of activation, ΔG*E have been calculated using the experimental ρ, u, and η values of pure [EMIM][CF3SO3], DMSO, ACN, and their binary/ternary mixtures at the studied temperatures and pressure. The excess/deviations properties for the studied binary/ternary systems have been fitted to Redlich–Kister equation. The variations of these parameters with composition and temperature are discussed in terms of ion–ion, ion–dipole, and dipole–dipole interactions prevailing in these mixtures. The excess molar volumes of each binary system have also been correlated to the Prigogine–Flory–Patterson (PFP) theory. Some semiempirical models for correlation/prediction of experimental dynamic viscosity data for studied binary and VE, Ks,mE, Δη, and ΔG*E for ternary mixtures have been applied.