Journal ArticleDOI
Thermophysical Properties of Imidazolium-Based Ionic Liquids
Christopher P. Fredlake,Jacob M. Crosthwaite,Daniel G. Hert,and Sudhir N. V. K. Aki,Joan F. Brennecke +4 more
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In this paper, the authors present density as a function of temperature, melting temperatures, glass transition temperatures, decomposition temperatures, and heat capacities for 13 ionic liquids, including 1-butyl-3-methylimidazolium trifluoromethanesulfonate.Abstract:
Ionic liquids (ILs) are salts that are liquid at low temperatures, usually including the region around room temperature. They are under intense investigation, especially as replacement solvents for reactions and separations, since they exhibit negligible vapor pressure and would not, therefore, contribute to air pollution. Clearly, basic thermophysical properties are vital for design and evaluation for these applications. We present density as a function of temperature, melting temperatures, glass-transition temperatures, decomposition temperatures, and heat capacities as a function of temperature for a series of 13 of the popular imidazolium-based ILs. The ionic liquids investigated here are 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium chloride, 1-butyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 1-butyl-3-methylimidazolium tris(trifluoromethylsul...read more
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A review of the thermophysical properties and potential of ionic liquids for thermal applications
Elaine Fabre,S. M. Sohel Murshed +1 more
TL;DR: In this paper, a critical review of the main thermophysical properties such as viscosity, density, specific heat capacity, thermal conductivity, thermal stability, and melting point of ionic liquids for their potential application as heat transfer fluids is presented.
Journal ArticleDOI
Understanding the heat capacity enhancement in ionic liquid-based nanofluids (ionanofluids)
Kamil Oster,Kamil Oster,Christopher Hardacre,Christopher Hardacre,Johan Jacquemin,Johan Jacquemin,Ana P. C. Ribeiro,Abdulaziz El-Sinawi +7 more
TL;DR: In this article, the authors discuss the mechanism of heat capacity enhancement of several ionic liquid-based nanofluids doped with carbon nanotubes, boron nitride and graphite.
Journal ArticleDOI
Heat capacity and electrical conductivity of aqueous mixtures of [Bmim][BF4] and [Bmim][PF6]
TL;DR: In this article, aqueous binary system of 1-butyl-3-methylimidazolium tetrafluoroborate, [Bmim][BF 4 ] and 1butyl 3methyloridazilium hexafluorophosphate, [BF 6 ] was measured with a differential scanning calorimeter.
Journal ArticleDOI
Synthesis and Characterization of Functionalized Ionic Liquids for Thermal Storage
TL;DR: In this article, a series of imidazolium-based ionic liquids were synthesized by introducing functional groups in the IMI cation to develop new phase change materials, and the structures of these ionic liquid were determined by nuclear magnetic resonance; the quantum calculation was performed based on density functional theory by Gaussian 09 to determine the number of hydrogen bonds among the ions.
Journal ArticleDOI
Heat capacities and low temperature thermal transitions of 1-hexyl and 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide
TL;DR: In this paper, the authors explored the reason for the discrepancy in differential scanning calorimetry (DSC) measurements of the isobaric heat capacity and low temperature thermal transitions of [Hmim][Tf2N] and 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([Omim] Tf 2N] made by DSC using steps of 10 K and a scan rate of 0.025 K·min−1.
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Journal ArticleDOI
Ionic Liquids-New "Solutions" for Transition Metal Catalysis.
Peter Wasserscheid,Wilhelm Keim +1 more
TL;DR: There are indications that switching from a normal organic solvent to an ionic liquid can lead to novel and unusual chemical reactivity, which opens up a wide field for future investigations into this new class of solvents in catalytic applications.
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Hydrophobic, Highly Conductive Ambient-Temperature Molten Salts
Pierre Bonhote,Ana-Paula Dias,Nicholas Papageorgiou,Kuppuswamy Kalyanasundaram,Michael Grätzel +4 more
TL;DR: New, hydrophobic ionic liquids with low melting points (<−30 °C to ambient temperature) have been synthesized and investigated, based on 1,3-dialkyl imidazolium cations and hydrophilic anions and thus water-soluble.
Journal ArticleDOI
Characterization and comparison of hydrophilic and hydrophobic room temperature ionic liquids incorporating the imidazolium cation
Jonathan G. Huddleston,Ann E. Visser,W. Matthew Reichert,Heather D. Willauer,Grant A. Broker,Robin D. Rogers +5 more
TL;DR: A series of hydrophilic and hydrophobic 1-alkyl-3-methylimidazolium room temperature ionic liquids (RTILs) have been prepared and characterized to determine how water content, density, viscosity, surface tension, melting point, and thermal stability are affected by changes in alkyl chain length and anion.
Journal ArticleDOI
Molecular states of water in room temperature ionic liquids
TL;DR: In this paper, the authors used ATR and transmission IR spectroscopy to investigate the state of water in room temperature ionic liquids (RTILs) based on the 1-alkyl-3-methylimidazolium cation with the anions.