In order to study the electrodeposition process of iridium in composite ionic liquid, the effects of N, N-dimethylacetamide（DMAC） on the viscosity, conductivity and electrochemical stability of composite ionic liqui...In order to study the electrodeposition process of iridium in composite ionic liquid, the effects of N, N-dimethylacetamide（DMAC） on the viscosity, conductivity and electrochemical stability of composite ionic liquid BMIC-BMIBF4, as well as the electrochemical behavior of Ir Cl3 in this system were studied. Iridium（Ir） coatings were deposited at different constant potentials and characterized by SEM and XRD. The results show that the addition of DMAC can evidently decrease the viscosity of the composite system, increase conductivity and improve electrochemical stability of the composite system. Cyclic voltammograms of a Au electrode illustrate that the process controlled by diffusion rate is irreversible with the average charge transfer coefficient of 0.170 and average diffusion coefficient of 1.096×10-6 cm^2/s. In addition, SEM image shows that Ir film deposited at the reduction peak potential is dense and even, while XRD pattern shows that Ir deposit is polycrystalline structure.展开更多
Terephthalic acid(PTA) is practically one of the main materials of polyester. Its corresponding solid-liquid equilibrium data will provide essential support for industry design and further theoretical studies. In this...Terephthalic acid(PTA) is practically one of the main materials of polyester. Its corresponding solid-liquid equilibrium data will provide essential support for industry design and further theoretical studies. In this work,solid-liquid equilibriums of terephthalic acid in four solvents, N,N-dimethylformamide, N,N-dimethylacetamide,dimethylsulphoxide and N-methyl-2-ketopyrrolidene, were determined in the temperature range from 293.15 K to 364.6 K by dynamic method. All these data were regressed by λh model, Wilson model and NRTL model, average absolute relative deviations of which are 1.25%, 15.02% and 7.22% respectively. It indicates that λh model is mostsuitable for description of the solid-liquid equilibrium containing PTA.展开更多
The decay dynamics of N, N-dimethylthioacetamide after excitation to the S3（ππ＊） state was studied by using the resonance Raman spectroscopy and complete active space self- consistent field method calculations. T...The decay dynamics of N, N-dimethylthioacetamide after excitation to the S3（ππ＊） state was studied by using the resonance Raman spectroscopy and complete active space self- consistent field method calculations. The UV-absorption and vibrational spectra were as- signed. The A-band resonance Raman spectra were obtained in acetonitrile, methanol and water with the laser excitation wavelengths in resonance with the first intense absorption band to probe the Franck-Condon region structural dynamics. The CASSCF calculations were carried out to determine the excitation energies and optimized structures of the lower- lying singlet states and conical intersection point. The A-band structural dynamics and the corresponding decay mechanism were obtained by the analysis of the resonance Raman in- tensity pattern and the CASSCF calculated structural parameters. The major decay channel of S3,FC （ππ＊）→S3（ππ＊）/S1 （nπ＊）→S1（nπ＊） is proposed.展开更多
Monophasic mullite gel with composition 3Al2O3·2SiO2 was prepared by the sol-gel method using aluminium nitrate nonahydrate, aluminium-tri-isopropoxide, and tetraethylorthosili-cate as reagents. Gels with differe...Monophasic mullite gel with composition 3Al2O3·2SiO2 was prepared by the sol-gel method using aluminium nitrate nonahydrate, aluminium-tri-isopropoxide, and tetraethylorthosili-cate as reagents. Gels with different drying control chemical additives(DCCAs) and polyvinylpyrrolidone(PVP) as spinning assistant were dried at several temperatures. The influences of temperature, DCCAs and PVP in the drying process were investigated. N,N-dimethylformamide(DMF) was the optimum DCCA at 70℃ in the drying process. PVP decreased the solvent volatilization speed and prevented gel crack to a certain extent. FTIR results revealed that free water, ethanol, and isopropanol were completely removed by the drying procedure.展开更多
A microporous luminescent metal-organic framework [Zn4L2（H2O）2]＇（H2O）m（DMA）n （1） （H4L=5,5＇-（（1H-pyrazole-3,5-di- carbonyl）bis（azanediyl））diisophthalic acid, DMA=N,N-dimethylacetamide） was synthesized...A microporous luminescent metal-organic framework [Zn4L2（H2O）2]＇（H2O）m（DMA）n （1） （H4L=5,5＇-（（1H-pyrazole-3,5-di- carbonyl）bis（azanediyl））diisophthalic acid, DMA=N,N-dimethylacetamide） was synthesized and characterized by infrared ra- diation （IR）, thermogravimetric analyses （TGA）, powder X-ray diffraction spectra （PXRD） and X-ray diffraction. Complex 1 has a three dimensional （3D） framework, which can be simplified as 5,5,5,5-c net with the Schlafi symbol of {43.64.83} {44.65.8 } {45.65 }2. This luminescent metal-organic framework （MOF） shows selectively sensitive to nitrobenzene and series of nitroaromatic explosives such as 4-nitrotoluene, 1,4-dinitrobenzene, 1,3-dinitrobenzene and 2,4-dinitrotoluene, and exhibits well recyclability. So complex 1 could be used to detect nitroaromatic explosives as a selective sensing material.展开更多
Various polysulfonamide （PSA） statistical copolymers were synthesized by polycondensation of three aromatic diamines and terephthaloyl chloride. The inherent viscosities of the resulting PSA copolymers range from 1....Various polysulfonamide （PSA） statistical copolymers were synthesized by polycondensation of three aromatic diamines and terephthaloyl chloride. The inherent viscosities of the resulting PSA copolymers range from 1.54 to 1.66 dL/g. The precipitated PSA copolymers with feed content of p-phenylene diamine （PPD） being less than 50% （mole fraction） can be redissolved in N-methyl-2-pryrrolidone （NMP） or N, N-dimethylacetamide （DMAc） with lithium chloride of WLiC1 ： 0.02. All of the PSA copolymers exhibit enhanced tensile strength in comparison with PSA and still maintain excellent thermal stability in either air or nitrogen atmosphere展开更多
基金Project(51071014)supported by the National Natural Science Foundation of ChinaProject(2010ZE51055)supported by the Aviation Science Foundation of China
文摘In order to study the electrodeposition process of iridium in composite ionic liquid, the effects of N, N-dimethylacetamide（DMAC） on the viscosity, conductivity and electrochemical stability of composite ionic liquid BMIC-BMIBF4, as well as the electrochemical behavior of Ir Cl3 in this system were studied. Iridium（Ir） coatings were deposited at different constant potentials and characterized by SEM and XRD. The results show that the addition of DMAC can evidently decrease the viscosity of the composite system, increase conductivity and improve electrochemical stability of the composite system. Cyclic voltammograms of a Au electrode illustrate that the process controlled by diffusion rate is irreversible with the average charge transfer coefficient of 0.170 and average diffusion coefficient of 1.096×10-6 cm^2/s. In addition, SEM image shows that Ir film deposited at the reduction peak potential is dense and even, while XRD pattern shows that Ir deposit is polycrystalline structure.
基金Supported by China Petroleum & Chemical Corporation(No.200049).
文摘Terephthalic acid(PTA) is practically one of the main materials of polyester. Its corresponding solid-liquid equilibrium data will provide essential support for industry design and further theoretical studies. In this work,solid-liquid equilibriums of terephthalic acid in four solvents, N,N-dimethylformamide, N,N-dimethylacetamide,dimethylsulphoxide and N-methyl-2-ketopyrrolidene, were determined in the temperature range from 293.15 K to 364.6 K by dynamic method. All these data were regressed by λh model, Wilson model and NRTL model, average absolute relative deviations of which are 1.25%, 15.02% and 7.22% respectively. It indicates that λh model is mostsuitable for description of the solid-liquid equilibrium containing PTA.
基金This work was supported by the National Natu- ral Science Foundation of China （No.21033002 and No.21202032） and the National Basic Research Pro- gram of China （No.2013CB834604）.
文摘The decay dynamics of N, N-dimethylthioacetamide after excitation to the S3（ππ＊） state was studied by using the resonance Raman spectroscopy and complete active space self- consistent field method calculations. The UV-absorption and vibrational spectra were as- signed. The A-band resonance Raman spectra were obtained in acetonitrile, methanol and water with the laser excitation wavelengths in resonance with the first intense absorption band to probe the Franck-Condon region structural dynamics. The CASSCF calculations were carried out to determine the excitation energies and optimized structures of the lower- lying singlet states and conical intersection point. The A-band structural dynamics and the corresponding decay mechanism were obtained by the analysis of the resonance Raman in- tensity pattern and the CASSCF calculated structural parameters. The major decay channel of S3,FC （ππ＊）→S3（ππ＊）/S1 （nπ＊）→S1（nπ＊） is proposed.
文摘Monophasic mullite gel with composition 3Al2O3·2SiO2 was prepared by the sol-gel method using aluminium nitrate nonahydrate, aluminium-tri-isopropoxide, and tetraethylorthosili-cate as reagents. Gels with different drying control chemical additives(DCCAs) and polyvinylpyrrolidone(PVP) as spinning assistant were dried at several temperatures. The influences of temperature, DCCAs and PVP in the drying process were investigated. N,N-dimethylformamide(DMF) was the optimum DCCA at 70℃ in the drying process. PVP decreased the solvent volatilization speed and prevented gel crack to a certain extent. FTIR results revealed that free water, ethanol, and isopropanol were completely removed by the drying procedure.
基金supported by the National Basic Research Program of China (2014CB845600)the National Natural Science of Foundation of China (21371102, 21421001)+1 种基金the MOE Innovation Team of China (IRT13022)the China Postdoctoral Science Foundation funded project (2015M571260)
文摘A microporous luminescent metal-organic framework [Zn4L2（H2O）2]＇（H2O）m（DMA）n （1） （H4L=5,5＇-（（1H-pyrazole-3,5-di- carbonyl）bis（azanediyl））diisophthalic acid, DMA=N,N-dimethylacetamide） was synthesized and characterized by infrared ra- diation （IR）, thermogravimetric analyses （TGA）, powder X-ray diffraction spectra （PXRD） and X-ray diffraction. Complex 1 has a three dimensional （3D） framework, which can be simplified as 5,5,5,5-c net with the Schlafi symbol of {43.64.83} {44.65.8 } {45.65 }2. This luminescent metal-organic framework （MOF） shows selectively sensitive to nitrobenzene and series of nitroaromatic explosives such as 4-nitrotoluene, 1,4-dinitrobenzene, 1,3-dinitrobenzene and 2,4-dinitrotoluene, and exhibits well recyclability. So complex 1 could be used to detect nitroaromatic explosives as a selective sensing material.
基金the National Natural Science Foundation of China (No. 50973059)the Scientific Research Foundation of 2009 Graduate School of Shanghai University
文摘Various polysulfonamide （PSA） statistical copolymers were synthesized by polycondensation of three aromatic diamines and terephthaloyl chloride. The inherent viscosities of the resulting PSA copolymers range from 1.54 to 1.66 dL/g. The precipitated PSA copolymers with feed content of p-phenylene diamine （PPD） being less than 50% （mole fraction） can be redissolved in N-methyl-2-pryrrolidone （NMP） or N, N-dimethylacetamide （DMAc） with lithium chloride of WLiC1 ： 0.02. All of the PSA copolymers exhibit enhanced tensile strength in comparison with PSA and still maintain excellent thermal stability in either air or nitrogen atmosphere
