New measurements have been made for the viscosity of the room-temperature ionic liquid 1-butyl- 3-methylimidazolium hexafluorophosphate ([BMIM]PF6) between (0 and 80) deg C with a falling-body viscometer. High-pressure measurements were made at (25, 35, 50, 60, and 70) deg C. The overall uncertainty is estimated at ( (2 to 3) %. Atmospheric pressure densities obtained with a vibrating tube densimeter are also reported for temperatures between (0 and 90) deg C with an overall uncertainty estimated at ( 0.00005 gacm-3. The viscosity behavior is qualitatively different from that of molecular liquids, with isotherms being best fitted as functions of the applied pressure rather than as functions of the molar volume. Modified Litovitz and Vogel-Fulcher-Tammann equations have been used to incorporate both the temperature and pressure dependence. Interestingly, the T0 parameter of the VFT equation appears to be independent of pressure within the state point range of the data, but the Angell strength parameter increases with increasing pressure.
Compounds
#
Formula
Name
1
C8H15F6N2P
1-butyl-3-methylimidazolium hexafluorophosphate
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.