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| - Temperature and Pressure Dependence of the Viscosity of the Ionic Liquids1-Methyl-3-octylimidazolium Hexafluorophosphate and1-Methyl-3-octylimidazolium Tetrafluoroborate
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| - The viscosities of the ionic liquids 1-methyl-3-octylimidazolium hexafluorophosphate, [OMIM]PF6, and 1-methyl-3-octylimidazolium tetrafluoroborate [OMIM]BF4, have been measured between (0 and 80) °C and at pressuresto 176 MPa ([OMIM]PF6) and 224 MPa ([OMIM]BF4) with a falling-body viscometer. The overall uncertaintyis estimated at ± (2 to 3) %. Modified Litovitz and Vogel−Fulcher−Tammann equations are used to representthe temperature and pressure dependence. The T0 parameter for the latter is found to be consistent with Angell'srelationship linking T0 and the strength parameter D with the glass temperature Tg. Densities between (0 and 90)°C at atmospheric pressure are also reported for both substances. These have an overall uncertainty estimated at± 0.00005 g·cm-3. The in-built viscosity correction for the Anton-Paar DMA5000 densimeter was confirmedusing high-viscosity reference standards to an upper limit of 16 Pa·s.
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