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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Long-term thermal stabilities of ammonium ionic liquids designed as potential absorbents of ammonia
TL;DR: In this paper, a series of new ammonium ionic liquids related to choline were designed and synthesized, in order to explore their applicability in refrigeration by absorption, their thermal stabilities were studied.
Journal ArticleDOI
Shear Viscosity of Ionic Liquids from Nonequilibrium Molecular Dynamics Simulation
TL;DR: In this article, the authors investigated the viscosity of butyl-3-methylimidazolium hexafluorophosphate by non-equilibrium molecular dynamics simulations with cosine-modulated force in the temperature range from 360 to 480 k. The simulation setting and choice of the force field are discussed in detail.
Journal ArticleDOI
Calorimetric study of polymorphism in 1-butyl-3-methylimidazolium hexafluorophosphate
Eugene Paulechka,Eugene Paulechka,Tatsiana Liavitskaya,Tatsiana Liavitskaya,Andrey V. Blokhin +4 more
TL;DR: In this article, stable and metastable crystal phases of 1-butyl-3-methylimidazolium hexafluorophosphate were obtained in an adiabatic calorimeter providing precise temperature control during crystallization.
Journal ArticleDOI
Buoyancy driven heat transfer behavior of [C4mim][NTf2] ionic liquid: An experimental study
Titan C. Paul,A. K. M. M. Morshed,Elise B. Fox,Ann E. Visser,Nicholas J. Bridges,Jamil A. Khan +5 more
TL;DR: In this article, the experimental results of natural convection heat transfer for 1-butyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}imide ([C 4 mim][NTf 2 ] ionic liquid (IL), in rectangular cavity with different aspect ratios, were presented.
Journal ArticleDOI
Studies of Volumetric and Transport Properties of Ionic Liquid–Water Mixtures and Its Viability To Be Used in Absorption Systems
TL;DR: In this article, the Vogel-Fulcher-Tamman (VFT) equation accurately describes the temperature dependence of viscosity for all systems, and the isobaric coefficient of thermal expansion was calculated to study the volumetric behavior of the mixtures.
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.