Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

Thermal Conductivities of [bmim][PF6], [hmim][PF6], and [omim][PF6] from 294 to 335 K at Pressures up to 20 MPa.

Tomida, D., Kenmochi, S., Tsukada, T., Qiao, K., Yokoyama, C.
Int. J. Thermophys. 2007, 28, 4, 1147-1160
ABSTRACT
Thermal conductivities are reported for a series of 1-alkyl-3-methylimidazolium hexafluorophosphates having butyl, hexyl, and octyl groups, which are expressed by [bmim][PF6], [hmim][PF6], and [omim][PF6], respectively. The experimental method used was a transient short hot wire method. Since only a small amount of sample liquid is required, this method was found to be effective for the thermal conductivity measurements of ionic liquids (ILs). The experimental temperatures ranged from 294 to 335 K at pressures up to 20 MPa. The values of the thermal conductivities of ILs at normal pressure are similar to those of benzene. It was found that an effect of the length of the alkyl chain on the thermal conductivities in ILs is negligible. From the data for the thermal conductivity and viscosity at 293.15 K and 0.1 MPa of ILs and normal alkanes, a simple correlation was developed based on the Mohanty theory. From comparisons between the thermal conductivities of ILs and those of organic liquids (n-hexane, benzene, and methanol), the temperature and pressure dependences of the thermal conductivity of ILs are relatively weak.
Compounds
# Formula Name
1 C8H15F6N2P 1-butyl-3-methylimidazolium hexafluorophosphate
2 C10H19F6N2P 1-hexyl-3-methylimidazolium hexafluorophosphate
3 C12H23F6N2P 1-octyl-3-methylimidazolium hexafluorophosphate
4 C7H8 toluene
5 C8H18 octane
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
  • 1
  • Thermal conductivity, W/m/K ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Hot wire method
  • 9
  • POMD
  • 1
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Constant-volume piezometry
  • 9
  • POMD
  • 2
  • Thermal conductivity, W/m/K ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Hot wire method
  • 9
  • POMD
  • 2
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Constant-volume piezometry
  • 9
  • POMD
  • 3
  • Thermal conductivity, W/m/K ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Hot wire method
  • 9
  • POMD
  • 3
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Constant-volume piezometry
  • 9
  • POMD
  • 4
  • Thermal conductivity, W/m/K ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Hot wire method
  • 9
  • POMD
  • 5
  • Thermal conductivity, W/m/K ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Hot wire method
  • 3