Binary mixtures of ([C4mim][NTf2] + molecular organic solvents): Thermophysical, acoustic and transport properties at various compositions and temperatures

Abstract

In this manuscript, densities, ρ, speeds of sound, u, and viscosities, η for binary mixtures of 1-butyl-3-methylimidazoliumbis(trifluoromethylsulfonyl)imide([C4mim][NTf2]) with molecular organic solvents (MOS) namely butyl acetate (BAC), butan-1-amine (BAM) and butanal (BAL) were measured at entire range of compositions. The measurements were collected at atmospheric pressure and temperature ranges from (298.15 to 323.15)K. The excess molar volumes, VmE, excess molar isentropic compressibilities, KS,mE, and logarithm of viscosity, lnηm were derived from measured values of densities, ρ, speeds of sound, u, and viscosity, η, respectively. The VmE, KS,mE and lnηm were correlated using Redlich–Kister polynomial equation. The non-ideal behaviour of these binary mixtures was discussed in light of temperature, nature of molecular organic solvent, structural effect and extent of molecular interactions exist in the binary mixtures. The VmE and KS,mE were negative and decrease with increasing temperature. The experimental VmE were reviewed by Prigogine–Flory–Patterson (PFP) theory.