Thermophysical properties of aqueous solutions of tetraalkylphosphonium based ionic liquids at different temperatures and atmospheric pressure

摘要: Abstract Densities, speed of sound and viscosities the aqueous solutions three tetraalkylphosphonium based ionic liquids namely Tributylmethylphosphonium methyl sulfate (0 to ∼0.28) mol · kg−1, Triisobutylmehtylphosphonium tosylate ∼0.52) mol · kg−1 Tetrabutylphosphonium chloride ∼0.57) mol · kg−1 have been measured at temperatures (298.15, 303.15, 308.15 313.15) K atmospheric pressure. The apparent molar volume, limiting volume coefficient thermal expansion values obtained from experimental density data whereas relative viscosity A B coefficients determined data. combined with evaluate isothermal isentropic compressibilities. hydration number has also calculated both compressibility are used interpret ion-ion ion-solvent interactions in studied systems we tried explain effect temperature concentration on it. volumetric data, negative BV (the deviation parameter Debye–Huckel theory) large positive for indicate strong solute-solute interaction water structure making liquids. All these discussed terms cation-cation, cation-anion probable alterations structural effects.