Volumetric, viscometric and acoustic properties of binary mixtures of 1-butyl-3-methylimidazolium hexafluorophosfate + organic solvents at several temperatures and atmospheric pressure

H. Hoga1, P. Volpe1 and R. Tôrres2

1Departamento de Físico-Química, Universidade Estadual de Campinas, Campinas, São Paulo, Brazil
2Departamento de Engenharia Química, Centro Universitário da FEI, São Bernardo do Campo, São Paulo, Brazil

Keywords: ionic liquids
property: volumetric, viscometric, acoustic
material: [BMIM][PF6] , organic solvents

In the present work, density, viscosity and speed of sound of the solutions of 1-butyl-3-methylimidazolium hexafluorophosfate [BMIM][PF6] + methanol, or + acetonitrile or + tetrahydrofuran have been measured over the entire composition range at (293.15, 298.15, 303.15 and 308.15 ) K and atmospheric pressure. Both pure liquid and mixture viscosity were measured using a Stabinger viscosimeter (Anton Paar SVM 3000M). Density and speed of sound were measured using a commercial density and speed of sound measurement apparatus (Anton Paar DSA 5000 densimeter and speed of sound analyzer). Excess molar volume, deviation in viscosity and deviation in isentropic compressibility have been calculated from the data and fitted to the Redlich-Kister polynomial. For all properties, the values are negative over the entire composition range. Excess molar volume and deviation in isentropic compressibility decrease whereas deviation in viscosity increases with increasing in temperature. The results obtained are discussed in terms of intermolecular interactions between unlike molecules.

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