Thermophysical Properties of 1-Butyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate, [C4mim][(C2F5)3PF3], and of Its IoNanofluid with Multi-Walled Carbon Nanotubes

Carlos Alberto Nieto de Castro, Ana Paula da Costa Ribeiro, Andreia Oliveira Figueiras, Elisa Langa, Salomé Inês Cardoso Vieira, Maria José Vitoriano Lourenço, Ângela Filomena Simões dos Santos, Fernando José Vieira dos Santos, Isabel Maria Santos Lampreia, Peter Goodrich, Christopher Hardacre

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4 Citations (Scopus)

Abstract

Thermophysical properties of 1-butyl-3-methylimidazoliumtris(pentafluoroethyl) trifluorophosphate, [C4mim][(C2F5)3PF3] (CAS RN 917762-91-5) ionic liquid, were measured in the temperature range T = (283.15–353.15) K, at P = 0.1 MPa. These properties include density, isobaric heat capacity, speed of sound, refractive index, viscosity, and thermal conductivity and their correlation as a function of temperature. Data obtained were compared with the available literature, whenever available. Comparison of these results with those reported for ILs with the same cation or anion is presented and discussed. Derived quantities such as isobaric expansivity and isothermal and isentropic compressibility were also estimated. Arrhenius, Ghatee, Vogel–Fulcher–Tammann, and IUPAC equations were applied to correlate viscosity data dependence on temperature, the last one being more effective and accurate. An estimation method for thermal conductivity of ILs was applied. Calculated values by this equation deviate from the experimental data between −15.6% at 293 K and −17.9% at 353 K, within the mutual uncertainty of these data and estimation. The thermal conductivity of the IoNanofluid made from the dispersion of multi-walled carbon nanotubes (1% wt MWCNTs) in [C4mim][(C2F5)3PF3] was determined. The enhancement in thermal conductivity due to the presence of MWCNTs was found to vary between 4% at 293 K and 9.6% at 353 K, an average of 6.2%, weakly dependent on temperature.
Original languageEnglish
Pages (from-to)1717-1729
Number of pages13
JournalJournal of Chemical and Engineering Data
Volume66
Issue number4
DOIs
Publication statusPublished - 08 Apr 2021

Keywords

  • General Chemistry
  • General Chemical Engineering

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