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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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
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Ab initio simulations of thermal decomposition and of electron transfer reactions in room temperature ionic liquids
TL;DR: Selected aspects of the ab initio modelling of room temperature ionic liquids are discussed, focusing on thermal decomposition reactions, and on the determination of the electrochemical stability window of these compounds.
Journal ArticleDOI
Unusual trend of viscosities and densities for four ionic liquids containing a tetraalkyl phosphonium cation and the anion bis(2,4,4-trimethylpentyl) phosphinate
Xiangyang Liu,Xiangyang Liu,Waheed Afzal,Waheed Afzal,Waheed Afzal,John M. Prausnitz,John M. Prausnitz +6 more
TL;DR: In this paper, densities and viscosities were reported for three similar ionic liquids, all with anion bis(2,4,4-trimethylpentyl) phosphinate [TMPP] and showed a monotonic trend with the length of the hydrocarbon chains attached to the phosphonium cation.
Journal ArticleDOI
The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte
Petr Sedlak,Adam Gajdoš,R. Macku,Jiri Majzner,Vladimir Holcman,Vlasta Sedlakova,Petr Kubersky +6 more
TL;DR: Investigation of the effect of diverse crystallinity of imidazolium ionic-liquid-based SPE on conductivity and current fluctuations showed that flicker noise, thermal noise and shot noise seems to be major noise sources in all samples.
Journal ArticleDOI
Mass spectral evaluation of column bleeding for imidazolium-based ionic liquids as GC liquid phases.
M. V. Shashkov,V. N. Sidelnikov +1 more
TL;DR: Mass spectra were obtained to evaluate the use of numerous single-cation and dicationic ionic liquids as stationary liquid phases in GC/MS at high temperature, including the detailed fragmentation pathway of the 1,2-dimethyl-3-propylimidazole cation.
Journal ArticleDOI
The effects of counterion composition on the rheological and conductive properties of mono- and diphosphonium ionic liquids
Reimi Yonekura,Mark W. Grinstaff +1 more
TL;DR: The monocationic phosphonium ionic liquids have higher conductivity than their dicationic analogs at all measured temperatures and showed minimal side chain dependence.
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.