Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Temperature dependence of the electrical conductivity in EMIM-based ionic liquids Evidence of Vogel Tamman Fulcher behavior

Vila, J., Gines, P., Pico, J. M., Franjo, C., Jimenez, E., Varela, L. M., Cabeza, O.
Fluid Phase Equilib. 2006, 242, 2, 141-146
ABSTRACT
We present measurements of the electrical conductivity versus temperature for six pure 1-ethyl-3-methyl imidazolium (EMIM) based ionic liquids (ILs) at atmospheric pressure. The temperature range measured goes from 250 to 430 K, although the exact range for each IL varies depending on its melting and vaporisation temperatures. The data measured shows that the electrical conductivity value for all ILs, except EMIM-BF4, increases more than 200 times for temperature increases of 180 K. We have also observed that the temperature dependence of the electrical conductivity for all measured ILs can be fitted with high precision with a Vogel Tamman Fulcher (VTF) type equation. From the fitting parameters we will extract the activation energy and the glass transition temperature.
Compounds
# Formula Name
1 C6H11BrN2 1-ethyl-3-methylimidazolium bromide
2 C6H11ClN2 1-ethyl-3-methylimidazolium chloride
3 C6H11BF4N2 1-ethyl-3-methylimidazolium tetrafluoroborate
4 C8H16N2O4S 1-ethyl-3-methylimidazolium ethyl sulfate
5 AlBr3 aluminum bromide
6 AlCl3 aluminum chloride
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 3
  • Electrical conductivity, S/m ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Alternating current cell with electrodes
  • 36
  • POMD
  • 4
  • Electrical conductivity, S/m ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Alternating current cell with electrodes
  • 36
  • POMD
  • 5
  • 1
  • Electrical conductivity, S/m ; Liquid
  • Mole fraction - 5; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Crystal - 5
  • Alternating current cell with electrodes
  • 61
  • POMD
  • 6
  • 2
  • Electrical conductivity, S/m ; Liquid
  • Mole fraction - 6; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Crystal - 6
  • Alternating current cell with electrodes
  • 60