1 research outputs found
Temperature and Pressure Dependence of the Electrical Conductivity of 1‑Butyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)amide
The
electrical conductivities of the ionic liquid 1-butyl-3-methylimidazolium
bisÂ(trifluoroÂmethanesulfonyl)Âamide ([BMIM]Â[Tf<sub>2</sub>N]) have been determined between (273 and 353) K over an extended
pressure range up to 250 MPa by both electrochemical impedance spectroscopy
and conductance bridge techniques. The results obtained by the two
techniques are generally in good agreement, within 3%, though the
conductance bridge results yield lower values outside the experimental
uncertainties at higher conductivities, that is, at higher temperature
and lower pressures where the maximum deviation is −7%. The
temperature and pressure dependence of both the conductivity and molar
conductivity have been represented by modified Vogel–Fulcher–Tammann
equations. The molar conductivity scales with the viscosity, with
overlapping isobars and isotherms, so that a Walden plot, the logarithmic
projection of molar conductivity versus fluidity (reciprocal viscosity),
is a straight line with a similar slope (0.924) to those obtained
for other 1,3-dialkylimidazolium ionic liquids