Densities and thermal conductivities of ionic liquids, 1-hexyl-3-methylimidazolium chloride, 1-octyl-3-methylimidazolium chloride, and 1-octyl-3-methylimidazolium bromide, at pressures up to 20 MPa

Daisuke Tomida, Satoshi Kenmochi, Kun Kyo, Chiaki Yokoyama

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Density and thermal conductivity values are reported for 1-hexyl-3-methylimidazolium chloride ([HMIM][Cl]), 1-octyl-3-methylimidazolium chloride ([OMIM][Cl]), and 1-octyl-3-methylimidazolium bromide ([OMIM] [Br]) ionic liquids (ILs). The densities were measured using a vibrating tube densimeter over the temperature range 293-353 K, at pressures ≤20 MPa. The combined standard uncertainty in density was estimated to be 0.1%. The transient short hot-wire method was used to measure the thermal conductivities over the temperature range 294-335 K at pressures ≤20 MPa. The combined standard uncertainty in thermal conductivity is estimated to be 3.0% for [HMIM][Cl] and [OMIM][Cl], and 4.8% for [OMIM][Br]. The measured densities agreed with some of the available literature values, within their experimental uncertainties. The thermal conductivities of these halide-Type ILs are in the same range as those of other ILs and have a very small temperature and pressure dependence as it is for other ILs. The deviations of the experimental values at 293.15 K and 0.1 MPa from the predicted values proposed by Koller et al. were in good agreement for these three ILs.

Original languageEnglish
Pages (from-to)101-114
Number of pages14
JournalHigh Temperatures - High Pressures
Volume46
Issue number2
Publication statusPublished - 2017 Jan 1

Keywords

  • Correlation
  • Density
  • High pressure
  • Ionic liquid
  • Prediction
  • Thermal conductivity
  • Transient short hot-wire method

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Physical and Theoretical Chemistry

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