A novel hydrophobic ionic liquid N-butyl-3-methyl pyridinium bis(trifluoromethylsulfonyl)imide([C4M3Py][NTf2]) is synthesized and characterized.The electrical conductivities of three binary sys-tems composed of the ionic liquid and methanol,ethanol,and isopropanol are determined respectively.The re-sults show the electrical conductivities of the binary systems are greater than that of the pure ionic liquid and thestrength sequence of the conductivities is: k([C4M3Py][NTf2]+ methanol) > k([C4M3Py][NTf2 + etha-nol) > k([C4M3Py][NTf2 + isopropanol).The relationship between the ionic liquid concentrations and theconductivities of the mixed systems is described by an empirical Castell-Amisequation.

A novel ionic liquid electrolyte of 1-Pentyl-3-methylimidazolium thiocyanate salts ((Pmim)(SCN)) was synthesized by two-steps methods. The fundamental physico-chemical properties of the ionic liquid electrolyte were investigated. A supercapacitor composed of the activated carbon electrode and the ionic liquid electrolyte was prepared. The electrochemical performance of the supercapacitor was studied. The results show that prepared (Pmim)(SCN) has higher electrical conductivity than common ionic liquids, and the density and the surface tension of the ionic liquid decrease with the increase of temperature. The working voltage of the supercapacitor reaches to 4.0 V. The specific capacitance of the supercapacitor is as high as 421.05 F/cm 3 , and the charge-discharge efficiency is 96.3 %. In addition, the prepared ionic

An air- and water-stable hydrophobic ionic liquid N-butyl-3-methylpyridinium bis(trifluoromethylsulfonyl)imide ([c(4)3mpy][NTf2]) was synthesized and characterized. Density, surface tension, dynamic viscosity, and electrical conductivity of the IL were measured and calculated from (278.15 to 353.15) K. The glass transition temperature and decomposition temperature were determined by the differential scanning calorimetry and thermogravimatric analysis. The physicochemical properties like molecular volume, standard molar entropy, lattice energy, parachor, molar enthalpy of vaporization, interstice volume, thermal expansion coefficient, interstice fraction, etc. of the IL were estimated by the reported empirical and semiempirical equations. The dynamic viscosity and electrical conductivity data of the IL were described by Vogel-Fulcher-Tamman and Arrhenius equations, respectively. Then, the relationship between the molar conductivity and dynamic viscosity of this IL was expressed through the Walden rule.

Air- and water-stable hydrophobic ionic liquids N-alkylpyridinium bis(trifluoromethylsulfonyl)imide ([C(n)py][NTf2], n = 3, 6) were synthesized. The density, surface tension, dynamic viscosity, and electrical conductivity of [C(6)py][NTf2] were measured in the range of T = (283.15 to 338.15) K. The density, dynamic viscosity, and electrical conductivity of [C(3)py][NTf2] were measured in the range of T = (308.15 to 338.15) K. The melting and glass transition temperatures of the two ILs were determined according to the differential scanning calorimetry (DSC). The physicochemical properties, including molecular volume, standard molar entropy, lattice energy, parachor, molar enthalpy of vaporization, interstice volume, interstice fraction, and thermal expansion coefficient, were estimated in terms of empirical and semiempirical equations, as well as the interstice model theory on the base of the experimental values. The dynamic viscosity and electrical conductivity values were fitted by Vogel-Fulcher-Tammann (VFT) and Arrhenius equations for [C(6)py][NTf2] and the Arrhenius equation for [C(3)py][NTE2].

A series of solutions composed of air- and water-stable hydrophobic ionic liquids (ILs) [Etpy] [Tf2N], [Bupy][Tf2N], [PepY] [Tf2N], [EtM(4)py] [Tf2N], and [BuM(4)py][Tf2N] were prepared. The electrical conductivity of the solutions was investigated at T = 298.15 K, respectively. Then the electrical conductivity of solutions of [Bupy] [Tf2N] and [HePY][Tf2N] in acetonitrile/propylene carbonate were investigated at temperature range from (283.15 to 313.15) K. The correlation of concentration and electrical conductivity was fitted according to the empirical Casteel-Amis (CA) equation. The maximum electrical conductivity was extrapolated by the fitted result. The influence of the successive methylene (-CH2-) group and the organic solvent to the electrical conductivity was discussed. The temperature dependence of the electrical conductivity of the solutions, ILs [BupY] [Tf2N] and [Hepy][Tf2N] in acetonitrile/propylene carbonate, was fitted by the empirical Vogel-Fulcher-Tamman (VFT) equation at a volume ratio of 50%.

The molar enthalpies of solution, Delta H-sol(m)(wc), of a new amino acid ionic liquid 1-butyl-3-methylimidazolium glutamine [Bmim][Glu], containing various amounts of water and with various aqueous molalities, were measured with a solution-reaction isoperibol calorimeter at (298.15 +/- 0.01) K, where wc denotes water content. The standard molar enthalpies of solution of [Bmim][Glu] with given amounts of water, Delta H-sol(m)0(wc) were obtained according to Archer's method. To eliminate the effect of the small amount of water in [Bmim][Glu], a linear fitting of Delta H-sol(m)0(wc) versus the water content was carried out, and the intercept, Delta H-sol(m)0 (Pure ionic liquid) = (40.55 +/- 0.06) kJ.mol(-1), is the standard molar enthalpy of solution of anhydrous [Bmim][Glu]. Furthermore, the Glasser's theory of lattice energy was used to estimate the hydration enthalpy of glutamine anion [Glu](-).