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http://dx.doi.org/10.9713/kcer.2012.50.4.708

Physical and Thermodynamic Properties of Imidazolium Ionic Liquids  

Oh, Sooyeoun (Department of Chemical and Biological Engineering, Korea National University of Transportation)
Kang, Jeong Won (Department of Computer Engineering, Korea National University of Transportation)
Park, Byung Heung (Department of Chemical and Biological Engineering, Korea National University of Transportation)
Kim, Ki-Sub (Department of Chemical and Biological Engineering, Korea National University of Transportation)
Publication Information
Korean Chemical Engineering Research / v.50, no.4, 2012 , pp. 708-712 More about this Journal
Abstract
Ionic liquids (ILs) existing as liquid state at room temperature are composed of a immense heterocyclic cation and inorganic anion which is smaller than cation's size. Thus, the species of cation and anion as well as the length of alkyl group on the cation have influence on their physical properties. Their outstanding properties such as non-volatility, thermal stability and wide range of electrochemical stability make these materials excellent candidates for green solvent which can substitute the conventional organic solvents. In this study, ILs based on imidazolium cation have been synthesized such as 1-butyl-3-methylimidazolium bromide ([BMIM][Br]), 1-butyl-3-methylimidazolium chloride ([BMIM] [Cl]), 1-butyl-3-methylimidazolium iodide ([BMIM][I]), and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][$BF_4$]). The density, viscosity, refractive index, heat capacity and ionic conductivity of [BMIM][Br], [BMIM][I], and [BMIM] [$BF_4$] were measured over range of temperature of 293.2 to 323.2 K. The density and refractive index values of [BMIM][I] were the highest among three ILs and the viscosity values of [BMIM][Br] were the highest among three ILs. The heat capacities [BMIM][$BF_4$] were higher than those of [BMIM][Br]. The ionic conductivities of [BMIM][$BF_4$] were higher than those of [BMIM][I].
Keywords
Ionic Liquid; Imidazolium Salt; Physical Property; Ionic Liquid Synthesis;
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Times Cited By KSCI : 1  (Citation Analysis)
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