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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Journal ArticleDOI
Density and Heat Capacity as a Function of Temperature for Binary Mixtures of 1-Butyl-3-methylpyridinium Tetrafluoroborate + Water, + Ethanol, and + Nitromethane
TL;DR: In this paper, experimental measurements of density and isobaric molar heat capacity for binary systems containing ionic liquid 1-butyl-3-methylpyridinium tetrafluoroborate + water, + ethanol, and + nitromethane are presented within the temperature range (293.15 to 318.15) K at atmospheric pressure.
Journal ArticleDOI
Noncorrosive ionic liquids composed of (HSO4) as esterification catalysts
TL;DR: In this article, seven Bronsted acidic ionic liquids (BAILs) composed of [HSO4] were prepared, characterized, and used as catalysts of low dosage in various esterification reactions.
Book ChapterDOI
Review of CO2/CH4 Separation Membranes
TL;DR: In this paper, the state-of-the-art membranes for CO 2 /CH 4 separation: inorganic (carbon, zeolite, or silica), polymeric (pure or blend), and composite (mixed-matrix or room-temperature ionic liquid).
Journal ArticleDOI
Density, excess properties, electrical conductivity and viscosity of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide + γ-butyrolactone binary mixtures
TL;DR: In this article, the density, electrical conductivity and viscosity of binary liquid mixtures of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, with γ-butyrolactone (GBL) were measured at temperatures from (293.15 to 323.15) K and at atmospheric pressure over the whole composition range.
Journal ArticleDOI
Volumetric, acoustic and spectroscopic studies for binary mixtures of ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) with alkoxyalkanols at T = (288.15 to 318.15) K
Amalendu Pal,Bhupinder Kumar +1 more
TL;DR: In this article, the authors measured densities and speeds of sound for the binary mixtures of ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate [bmim][PF6] with ethylene glycol monoethyl ether (EGMEE), diethylene gane and di-Di-Gane (DiGane), triethylene glycol polyethylene (Tri-Gene) over the whole composition range at atmospheric pressure.
References
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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.
Journal ArticleDOI
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.