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The Thermodynamic Estimation and Viscosity, Electrical Conductivity Characteristics of 1-Alkyl-3-Methylimidazolium Thiocyanate Ionic Liquids
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2014
Year
Materials ScienceWalden RuleSolid-state IonicEngineeringMolecular ThermodynamicsIonic LiquidsDynamic ViscosityIonic ConductorElectrical Conductivity CharacteristicsPhysical ChemistryTransport PhenomenaExperimental ThermodynamicsThermodynamicsChemistryThermodynamic EstimationDeep Eutectic SolventFunctional MaterialsThermophysical Property
Abstract A series of 1-alkyl-3-methylimidazolium thiocyanate [C n mim][SCN] ( n = 2–5) ionic liquids (ILs) with low dynamic viscosity were synthesized by a two-step method and characterized by IR and 1 H NMR spectroscopy. The physicochemical properties of the ILs such as density, surface tension, dynamic viscosity, and electrical conductivity were measured. The significant thermodynamic parameters of the ILs such as molecular volume, standard molar entropy, lattice energy, parachor, interstice parameters, and thermal expansion coefficient were estimated according to semi-empirical/empirical methods. Subsequently, the viscosity and electrical conductivity characteristics of the [C 2–5 mim][SCN] were described by the Vogel–Fulcher–Tamman (VFT) equation. The results showed that the VFT equation was a proper fit for the ILs. Moreover, the transport properties of ILs were discussed based on the Walden rule and the relationships between molar conductivities and dynamic viscosities were evaluated.