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258 results on '"Yang Jia-Zhen"'

45. Studies on the properties of ionic liquid BMIInCl4

Author

Huang Ming, Yang Jia-Zhen, Xue Feng, Zhang Qing-guo, and Zang Shuliang

Subjects
Standard molar entropy, Chemistry, Ionic bonding, Thermodynamics, General Chemistry, Surface energy, Thermal expansion, Surface tension, Crystal, chemistry.chemical_compound, Ionic potential, Ionic liquid, Physics::Atomic and Molecular Clusters, Organic chemistry
Abstract

An ionic liquid (IL) was prepared by directly mixing InCl3 and 1-methyl-3-butylimidazolium chloride(BMIC) with molar ratio 1:1 under dry argon atmosphere. The densities, and surface tension of pure IL were determined at temperature range of (278.15 to 343.15±0.1K). The properties for ionic liquid based on group III were discussed using Glasser’s theory. The standard entropy, the surface energy and the crystal energy of ionic liquid were calculated, respectively. The crystal energy of ionic liquid is much lower than ionic solid and this is the underlying reason for forming ionic liquid at room temperature. In addition, a new theoretical model of IL, that is interstice model, was applied to calculate the thermal expansion coefficient of BMIInCl4. The order of magnitude for the thermal expansion coefficient, a, calculated by the theoretical model is in good agreement with experimental value. The result shows that there is much reasonableness for the interstice model of ionic liquid.

Published
2006

46. Thermodynamic investigation of room temperature ionic liquid: The heat capacity and standard enthalpy of formation of EMIES

Author

Xue-Chuan Lv, Zhi-Cheng Tan, Lixian Sun, Quan Shi, Yang Jia-Zhen, and Zhi-Heng Zhang

Subjects
Chemistry, Phase (matter), Enthalpy, Physical chemistry, Calorimetry, Physical and Theoretical Chemistry, Atmospheric temperature range, Condensed Matter Physics, Thermal analysis, Instrumentation, Heat capacity, Standard enthalpy of formation, Calorimeter
Abstract

The molar heat capacities of the room temperature ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate (EMIES) were measured by an adiabatic calorimeter in temperature range from 78 to 390 K. The dependence of the molar heat capacity on temperature was given as a function of the reduced temperature X by polynomial equations, Cp,m (J K−1 mol−1) = 178.6 + 50.28X + 2.886X2 − 1.362X3 + 0.6616X4 + 7.155X5 [X = (T − 132.5)/54.5] for the solid phase (78–187 K) and Cp,m (J K−1 mol−1) = 376.2 + 25.94X − 3.397X2 − 0.6407X3 + 0.8091X4 + 0.9869X5 [X = (T − 292.5)/97.5] for the liquid phase (195–390 K), respectively. According to the polynomial equations and thermodynamic relationship, the values of thermodynamic function of the EMIES relative to 298.15 K were calculated in temperature range from 80 to 390 K with an interval of 5 K. The glass translation of EMIES was observed at 192.85 K. Using oxygen-bomb combustion calorimeter, the molar enthalpy of combustion of EMIES was determined to be Δ c H m ° = − 5152.6 ± 4.6 kJ mo l − 1 . The standard molar enthalpy of formation of EMIES was evaluated to be Δ f H m ° = − 579.13 ± 0.51 kJ mo l − 1 at T = 298.150 ± 0.001 K.

Published
2006

47. Thermodynamic Properties of Ionic Liquid BMIAlCl4

Author

Yang Jia-Zhen, Zhang Qing-guo, Hong Mei, and Tong Jing

Subjects
chemistry.chemical_compound, Materials science, chemistry, Ionic liquid, Thermodynamics, Physical and Theoretical Chemistry
Published
2006

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