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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Thermodynamic, Dynamic, and Structural Properties of Ionic Liquids Comprised of 1-butyl-3-methylimidazolium Cation and Nitrate, Azide, or Dicyanamide Anions
Dmitry Bedrov,Oleg Borodin +1 more
TL;DR: IL was found to have the lowest enthalpy of vaporization and the weakest ion-ion structural correlation as compared to ILs with the other two ions, and this trend was further manifested in dynamical properties characterized by self-diffusion coefficients and molecular rotational relaxation times, where IL with the N(CN)(2) anion showed the fastest dynamics asCompared to other ILs.
Journal ArticleDOI
New ionic liquids with the bis[bis(pentafluoroethyl)phosphinyl]imide anion, [(C2F5)2P(O)]2N−—Synthesis and characterization
TL;DR: In this article, a series of low melting and hydrophobic ionic liquids (ILs) containing the bis[bis(pentafluoroethyl)phosphinyl]imide anion, [(C 2 F 5 ) 2 P(O)] 2 N − (FPI), and ammonium, phosphonium, imidazolium, pyridinium or pyrrolidiniam cations were prepared and characterized.
Journal ArticleDOI
Ionic liquids as bulk liquid membranes on levulinic acid removal: A design study
Nilay Baylan,Süheyla Çehreli +1 more
TL;DR: In this paper, imidazolium-based ionic liquids were used as a bulk liquid membrane (BILM) for levulinic acid removal, and the optimal conditions for BILM process were performed to obtain the higher removal efficiencies.
Journal ArticleDOI
Rhythmic melting and crystallizing of ionic liquid 1-butyl-3-methylimidazolium bromide
TL;DR: In this article, the authors measured heat flow processes near the melting point of a typical ionic liquid, 1-butyl-3methylimidazolium bromide ([C 4 mim]Br), using a laboratory-made differential scanning calorimeter with the base line stability of ±3 nW.
Journal ArticleDOI
Effects of alkyl group and temperature on the interactions between furfural and alcohol: Insight from density and sound velocity studies
TL;DR: In this paper, the Redlich-Kister polynomial equation was used to fit the excess/deviation properties of furfural and alcohol mixtures, and derived properties such as excess molar volumes, V m E, isentropic compressibility, κs, and deviation in isentropy compressibility Δκs, were also calculated.
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.
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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.
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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.