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
Reads0
Chats0
TLDR
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
Citations
More filters
Journal ArticleDOI
Activity coefficients at infinite dilution of organic solutes in the ionic liquid 1-butyl-3-methylimidazolium methyl sulfate
TL;DR: In this article, the (gas+ liquid) chromatographic method was used to measure the activity coefficients at infinite dilution (γ i ∞ ) and (gas + liquid) partition coefficients (KL) for organic solutes: alkanes, alkenes, alkyl benzenes, acetonitrile, acetone, tetrahydrofuran, ethyl acetate, and chloromethanes.
Journal ArticleDOI
Torrefaction of ionic-liquid impregnated lignocellulosic biomass and its comparison to dry torrefaction
TL;DR: In this paper, an ionic liquid-impregnated aspen, birch and sawdust were torrefied in the 240-280°C temperature range using [Emim][OTf] and [Hmim][NTf2] ILs.
Journal ArticleDOI
Plastic crystal behaviour in tetraethylammonium dicyanamide
TL;DR: In this article, the plastic crystal tetraethylammonium dicyanamide (N 2,2,2.2 ][dca) has been investigated with an emphasis on structure and dynamics in the plastic phase.
Journal ArticleDOI
The effect of n vs. iso isomerization on the thermophysical properties of aromatic and non-aromatic ionic liquids
Ana S. M. C. Rodrigues,Hugo F. D. Almeida,Mara G. Freire,José A. Lopes-da-Silva,João A. P. Coutinho,Luís M. N. B. F. Santos +5 more
TL;DR: The ILs constituted by non-aromatic piperidinium cation, and iso-alkyl isomers were found to be the most viscous among the studied ILs due to their higher energy barriers for shear stress.
Journal ArticleDOI
Acetate- and lactate-based ionic liquids: Synthesis, characterisation and electrochemical properties
TL;DR: In this article, the Vogel-Tammann-Fulcher (VTF) equation was used to describe the dependence of conductivity on temperature with high precision, and the electrochemical properties of all synthesized ionic liquids in a form of mixtures with acetonitrile were also determined.
References
More filters
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.