An ionic liquid was prepared by mixing AlCl3 and 1-methyl-3-ethylimidazolum bromide(EMIM)Br under dry argon atmosphere.Electrodeposition of aluminum on magnesium was conducted at 298.15 K for 1 h by the ionic liquid a...An ionic liquid was prepared by mixing AlCl3 and 1-methyl-3-ethylimidazolum bromide(EMIM)Br under dry argon atmosphere.Electrodeposition of aluminum on magnesium was conducted at 298.15 K for 1 h by the ionic liquid and the electrochemical behavior was discussed.The results show that the aluminium deposition occurs at a potential about-0.1 V.Cathode surface was analyzed by SEM,XRD and EDS.Aluminum is successfully electrodeposited on magnesium from(EMIM)Br-AlC13 ionic liquid,and the crystal grain quality of the deposit at 15 mA/cm2is ideal with the perfect boundary of crystal grain.展开更多
In this paper,AgBF_4/[emim][BF_4] supported ionic liquid membranes(SILMs) were prepared successfully for CO/N_2 separation using nitrogen pressure immobilization procedures.The incorporation of AgBF_4 could decrease m...In this paper,AgBF_4/[emim][BF_4] supported ionic liquid membranes(SILMs) were prepared successfully for CO/N_2 separation using nitrogen pressure immobilization procedures.The incorporation of AgBF_4 could decrease membrane weight loss,improve the pressure-resistant ability,and keep the critical pressure(0.45 MPa) of the SILMs.The high viscosity and undissolved Ag BF_4 solids in membrane liquid would disturb gas molecular transport through membrane and give rise to the gas transport resistance.Therefore,the gas permeability decreased remarkably with increasing AgBF_4 carrier content in the membrane.When the molar ratio of AgBF_4 to [emim][BF_4] increased from 0:1 to 0.3:1,the CO/N_2 selectivity of the SILMs showed a great increase from ～1 to ～9 at 20 °C and 0.4 MPa,suggesting that AgBF_4 was an effective carrier for CO facilitated transport.The permeabilities of N_2 and CO increased at higher transmembrane pressure,indicating that molecular transport would dominate the transport process at high pressure.The temperature-dependent gas permeability followed the Arrhenius equation.Moreover,the differences between the activation energies of CO and N_2 became larger after introducing AgBF_4,resulting in more obvious decrease in the CO/N_2 selectivity at higher operating temperature.展开更多
The Hartree-Fock and DFT/B3LYP methods have been employed to investigate the electronic structures of 1-ethyl-3-methyl-imidazolium cation （EMIM＋）, BF4^-, PF6^-, EMIM＋BF4^-, and EMIM＋-PF6^- using the Gaussian-94 s...The Hartree-Fock and DFT/B3LYP methods have been employed to investigate the electronic structures of 1-ethyl-3-methyl-imidazolium cation （EMIM＋）, BF4^-, PF6^-, EMIM＋BF4^-, and EMIM＋-PF6^- using the Gaussian-94 soft-package at 6-31＋G（d,p） basis set level for hydrogen, carbon, nitrogen, boron, phosphorus, and fluorine atoms. Comparison of the electronic structures of the lowest energy of EMIM＋- BF4^- and EMIM＋-PF6^- pairs, and single EMIM＋, BF4^- and PF6^- showed that the optimized EMIM＋-BF4^- and EMIM＋-PF6^- pair conformers were BF4^- and PF6^- outside the 5-ring plane between the ethyl group and the methyl group. The cohesion of C H. … F hydrogen bond between cation and anion is reinforced by charge assistance. The interaction energy between EMIM＋ and PF6 is 328.8 kJ/mol at the B3LYP level and 326.6 kJ/mol at the Hartree-Fock level, whereas that between EMIM＋ and BF4 is 353.5 kJ/mol at the B3LYP level and 350.5 kJ/mol at the Hartree-Fock level. The low energy interactions caused by bulky asymmetric EMIM＋, and charge dispersion of cation and anion give rise to the low melting point of ionic liquid EMIM＋-BF4^- and EMIM＋-PF6^-. The two hydrogen bonding models of single hydrogen bond formation, and the hydrogen transfer between C2 in EMIM＋ and F in BF4^- or PF6^- were principally depicted.展开更多
The falling film of an ionic liquid([EMIM][DMP]+H_(2)O)and its effect on a refrigeration system are numerically simulated in the framework of a Volume of Fluid(VOF)method(as available in the ANSYS Fluent computational...The falling film of an ionic liquid([EMIM][DMP]+H_(2)O)and its effect on a refrigeration system are numerically simulated in the framework of a Volume of Fluid(VOF)method(as available in the ANSYS Fluent computational platform).The properties of the liquid film and the wall shear stress(WSS)are compared with those obtained for a potassium bromide solution.Different working conditions are considered.It is noted that the ionic liquid demonstrates a better absorption capability,with a coefficient of performance(COP)of 0.55.It is proved that the[EMIM][DMP]+H_(2)O ionic liquid working substance is superior to the potassium bromide solution in terms of heat and mass transfer.展开更多
基金Project(50374045)supported by the National Natural Science Foundation of ChinaProject(Y2007F60)supported by the Natural Science Foundation of Shandong Province,China+2 种基金Project(J09LB59)supported by the High Education Science Technology of Shandong Province,ChinaProject(BS2009NJ007)supported by the Midlife-Youth Scientists Research Encouraging Foundation of Shandong Province,ChinaProject(2008)supported by the Zibo Science Technology Development of Shandong Province,China
文摘An ionic liquid was prepared by mixing AlCl3 and 1-methyl-3-ethylimidazolum bromide(EMIM)Br under dry argon atmosphere.Electrodeposition of aluminum on magnesium was conducted at 298.15 K for 1 h by the ionic liquid and the electrochemical behavior was discussed.The results show that the aluminium deposition occurs at a potential about-0.1 V.Cathode surface was analyzed by SEM,XRD and EDS.Aluminum is successfully electrodeposited on magnesium from(EMIM)Br-AlC13 ionic liquid,and the crystal grain quality of the deposit at 15 mA/cm2is ideal with the perfect boundary of crystal grain.
基金Financial support from the National Natural Science Foundation of China (21406235)
文摘In this paper,AgBF_4/[emim][BF_4] supported ionic liquid membranes(SILMs) were prepared successfully for CO/N_2 separation using nitrogen pressure immobilization procedures.The incorporation of AgBF_4 could decrease membrane weight loss,improve the pressure-resistant ability,and keep the critical pressure(0.45 MPa) of the SILMs.The high viscosity and undissolved Ag BF_4 solids in membrane liquid would disturb gas molecular transport through membrane and give rise to the gas transport resistance.Therefore,the gas permeability decreased remarkably with increasing AgBF_4 carrier content in the membrane.When the molar ratio of AgBF_4 to [emim][BF_4] increased from 0:1 to 0.3:1,the CO/N_2 selectivity of the SILMs showed a great increase from ～1 to ～9 at 20 °C and 0.4 MPa,suggesting that AgBF_4 was an effective carrier for CO facilitated transport.The permeabilities of N_2 and CO increased at higher transmembrane pressure,indicating that molecular transport would dominate the transport process at high pressure.The temperature-dependent gas permeability followed the Arrhenius equation.Moreover,the differences between the activation energies of CO and N_2 became larger after introducing AgBF_4,resulting in more obvious decrease in the CO/N_2 selectivity at higher operating temperature.
文摘The Hartree-Fock and DFT/B3LYP methods have been employed to investigate the electronic structures of 1-ethyl-3-methyl-imidazolium cation （EMIM＋）, BF4^-, PF6^-, EMIM＋BF4^-, and EMIM＋-PF6^- using the Gaussian-94 soft-package at 6-31＋G（d,p） basis set level for hydrogen, carbon, nitrogen, boron, phosphorus, and fluorine atoms. Comparison of the electronic structures of the lowest energy of EMIM＋- BF4^- and EMIM＋-PF6^- pairs, and single EMIM＋, BF4^- and PF6^- showed that the optimized EMIM＋-BF4^- and EMIM＋-PF6^- pair conformers were BF4^- and PF6^- outside the 5-ring plane between the ethyl group and the methyl group. The cohesion of C H. … F hydrogen bond between cation and anion is reinforced by charge assistance. The interaction energy between EMIM＋ and PF6 is 328.8 kJ/mol at the B3LYP level and 326.6 kJ/mol at the Hartree-Fock level, whereas that between EMIM＋ and BF4 is 353.5 kJ/mol at the B3LYP level and 350.5 kJ/mol at the Hartree-Fock level. The low energy interactions caused by bulky asymmetric EMIM＋, and charge dispersion of cation and anion give rise to the low melting point of ionic liquid EMIM＋-BF4^- and EMIM＋-PF6^-. The two hydrogen bonding models of single hydrogen bond formation, and the hydrogen transfer between C2 in EMIM＋ and F in BF4^- or PF6^- were principally depicted.
文摘The falling film of an ionic liquid([EMIM][DMP]+H_(2)O)and its effect on a refrigeration system are numerically simulated in the framework of a Volume of Fluid(VOF)method(as available in the ANSYS Fluent computational platform).The properties of the liquid film and the wall shear stress(WSS)are compared with those obtained for a potassium bromide solution.Different working conditions are considered.It is noted that the ionic liquid demonstrates a better absorption capability,with a coefficient of performance(COP)of 0.55.It is proved that the[EMIM][DMP]+H_(2)O ionic liquid working substance is superior to the potassium bromide solution in terms of heat and mass transfer.
