Temperature-Dependent Density and Viscosity of the Ionic Liquids 1-Alkyl-3-methylimidazolium Iodides: Experiment and Molecular Dynamics Simulation

The density and viscosity of synthesized 1-alkyl-3-methylimidazolium iodide ([Cnmim]I, n = 4, 6, 8) were measured in the wide range of temperature of (298 to 393) K. Using a vacuum line, measurements of the viscosity were made under a water-vapor free atmosphere. The viscosity decreases sharply with temperature and increases as the alkyl chain length increases. The molecular dynamics simulation was performed for the densities of these ionic liquids to remedy the lack of literature experimental data. The results are quite in agreement with the experiments, with a maximum deviation of 3.00 % due to [C8mim]I at 358 K. The viscosities fit best in the modified Arrhenius, Vogel−Fulcher−Tammann (VFT), and Litovitz equations. The viscosities also fit in the simple linear equation we proposed recently with accuracies comparable with Litovitz and VFT.

[1]  J. Tojo,et al.  Dynamic Viscosities of a Series of 1-Alkyl-3-methylimidazolium Chloride Ionic Liquids and Their Binary Mixtures with Water at Several Temperatures , 2006 .

[2]  K. Seddon,et al.  Viscosity and Density of 1-Alkyl-3-methylimidazolium Ionic Liquids , 2002 .

[3]  Morteza Zare,et al.  Temperature dependence of viscosity and relation with the surface tension of ionic liquids , 2010 .

[4]  Huen Lee,et al.  Physical and electrochemical properties of 1-butyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium iodide, and 1-butyl-3-methylimidazolium tetrafluoroborate , 2004 .

[5]  K. R. Harris,et al.  Temperature and Pressure Dependence of the Viscosity of the Ionic Liquids 1-Methyl-3-octylimidazolium Hexafluorophosphate and 1-Methyl-3-octylimidazolium Tetrafluoroborate , 2006 .

[6]  Johan Jacquemin,et al.  Density and viscosity of several pure and water-saturated ionic liquids , 2006 .

[7]  Hui Jin,et al.  Physical properties of ionic liquids consisting of the 1-butyl-3-methylimidazolium cation with various anions and the bis(trifluoromethylsulfonyl)imide anion with various cations. , 2008, The journal of physical chemistry. B.

[8]  J. Magee,et al.  The effect of dissolved water on the viscosities of hydrophobic room-temperature ionic liquids. , 2005, Chemical communications.

[9]  E. Castner,et al.  Why are viscosities lower for ionic liquids with -CH2Si(CH3)3 vs -CH2C(CH3)3 substitutions on the imidazolium cations? , 2005, The journal of physical chemistry. B.

[10]  K. R. Harris,et al.  Temperature and Pressure Dependence of the Viscosity of the Ionic Liquids 1-Hexyl-3-methylimidazolium Hexafluorophosphate and 1-Butyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide , 2007 .

[11]  A. Pensado,et al.  Study of the effects of pressure on the viscosity and density of diisodecyl phthalate , 2009 .

[12]  S. Singh,et al.  Viscosities and densities of ternary liquid mixtures of DEHPA, benzene and ortho-xylene , 2000 .

[13]  W. M. Haynes.  CRC Handbook of Chemistry and Physics , 1990 .

[14]  J. Brennecke,et al.  Solution Thermodynamics of Imidazolium-Based Ionic Liquids and Water , 2001 .

[15]  K. Seddon,et al.  Influence of chloride, water, and organic solvents on the physical properties of ionic liquids , 2000 .

[16]  Jia-zhen Yang,et al.  Studies on the thermodynamic properties of new ionic liquids: 1-Methyl-3-pentylimidazolium salts containing metal of group III , 2006 .

[17]  Robin D. Rogers,et al.  Characterization and comparison of hydrophilic and hydrophobic room temperature ionic liquids incorporating the imidazolium cation , 2001 .

[18]  Jong-Ho Cha,et al.  Surface tension and viscosity of 1-butyl-3-methylimidazolium iodide and 1-butyl-3-methylimidazolium tetrafluoroborate, and solubility of lithium bromide+1-butyl-3-methylimidazolium bromide in water , 2006 .

[19]  Jacobo Troncoso,et al.  Viscosity-induced errors in the density determination of room temperature ionic liquids using vibrating tube densitometry , 2007 .

[20]  M. Ghatee,et al.  Surface tension measurements of imidazolium-based ionic liquids at liquid–vapor equilibrium , 2008 .

[21]  C. Comminges,et al.  Determination of Viscosity, Ionic Conductivity, and Diffusion Coefficients in Some Binary Systems: Ionic Liquids + Molecular Solvents , 2006 .

[22]  T. Vandernoot,et al.  Temperature dependence of viscosity for room temperature ionic liquids , 2004 .

[23]  P. Watson,et al.  Surface orientation in ionic liquids , 2001 .

[24]  K. R. Harris,et al.  Temperature and pressure dependence of the viscosity of the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate , 2005 .

[25]  Jiangtao Wu,et al.  Density and viscosity measurements of diethyl ether from 243 to 373 K and up to 20 MPa , 2008 .