AC/DC conductivity and dielectric relaxation behavior of aqueous solutions of 1-butyl-3-methylimidazolium chloride

Rana, V. A.; Barot, D. K.; Vankar, H. P.

Abstract

The complex relative dielectric function ɛ*(f) = ɛ' - jɛ" of aqueous solutions of 1-butyl-3-methylimidazolium chloride [BMiM][Cl] of varying concentrations, has been measured using precision LCR meter in the frequency range 20 Hz to 2 MHz at four different temperatures 293.15, 303.15, 313.15 and 323.15 K. Complex ac conductivity σ*(f) of the liquid samples have been determined from the measured ɛ*(f). DC conductivity σdc of the samples have also been determined. Values of σdc at different concentrations have been fitted to the empirical Casteel-Amis (CA) equation. The influence of concentration and temperature variation on the complex permittivity and electrical conductivity of the solutions of [BMiM][Cl] in distilled water has been discussed. The molar conductivities and the infinite dilution conductance of these ionic liquids have also been determined. Orientational relaxation behavior of the aqueous solutions of [BMiM][Cl] has also been studied by measuring complex permittivity in the frequency range 1 GHz to 20 GHz using vector network analyzer. Various processes contributed to the electrical/dielectric properties of the solutions of [BMiM][Cl] in distilled water have been explored.

Keyword(s)

Ionic liquids; Dielectric properties; Electrical conductivity; Precision LCR meter; Casteel-amis model; Vector network analyzer

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