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Start Over Author "Du, Jin" Journal advanced materials research
40 results on '"Du, Jin"'

37. Synthesis of Ionic Liquids [BMIM]BF4 and [BMIM]PF6 under Microwave Irradiation by One-Pot

Author

Du, Xi Gang, Du, Jin Ping, Zhang, Jun, Guo, Xu Ming, Lu, Wei Wei, and Yang, Zhen Yu

Abstract

Ionic liquids 1-brutyl-3-methylimidazolium Tetrafluoroborate [BMIM]BF4 and 1-brutyl-3-methylimidazolium hexafluorophosphate [BMIM]PF6 were synthesized directly from 1-butylbromide, 1-methylimidazole, sodium tetrafluoroborate or hexafluorophosphate using microwave by one-pot under solvent-free conditions in an unmodified household oven. This method requires only a few minutes of reaction time, in contrast to the several hours needed using conventional methods by two pots that requires a lot of organic solvent. The reaction yield of ionic liquids with intermittent microwave heating is much higher than that of ionic liquids with conventional microwave heating. Thus the intermittent microwave heating is a good method for the reaction. The yield of the two ionic liquids increased slightly with increment of molar ratio of sodium tetrafluoroborate or potassium hexafluorophosphate.

Published
2012
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38. Effect of Sintering Temperature on Properties of NiFe2O4-Matrix Inert Anode for Aluminum Electrolysis by Adding Nanopowder

Author

Zhang, Zhi Gang, Liu, Yi Han, Yao, Guang Chun, Wu, Di, and Du, Jin Jing

Abstract

Conventional cold pressing-sintering technique was utilized to fabricate NiFe2O4-matrix inert anode for aluminum electrolysis by adding NiFe2O4 spinel nanopowder. The effect of sintering temperature on properties of NiFe2O4-matrix ceramics was investigated especially. The results indicate that the density increases and the porosity decreases with the sintering temperature increasing, due to the higher diffusion coefficient enhanced by higher temperature. The bending strength and fracture toughness reach maximum values of 55.39MPa and 2.53MPa•m1/2 respectively, when the sintering temperature is 1400℃.

Published
2012
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39. Properties of SnO-B2O3-SiO2 Lead-Free Glass Powder

Author

Zhu, Hua, Gan, Guo You, Yan, Ji Kang, Du, Jin Hong, Yi, Jian Hong, Zhang, Jia Min, and Zhang, Dai Bing

Abstract

SnO-B2O3-SiO2 glass powders, in which the different contents of SnO and B2O3 were 35% ~ 70%wt and 26% ~ 61% wt respectively, were prepared through high-temperature melting, water quenching and Ball milling. XRD showed that the performance of forming glass was very good and the range of extension was very wide. The effect of the contents of SnO and B2O3 on Tg, acidoresistant and density of prepared glass was studied. IR showed that it generates the heavy metal oxide generated glass. The density of glass powder decrease with increase of B2O3 content, but increase with increasing SnO content. SnO-B2O3-SiO2 glass had excellent chemical stability. Differential thermal analysis (DTA) shown that, with increasing SnO content, glass transition temperature first lower and then decreased.

Published
2011
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40. Epoxidation of Styrene with Molecular Oxygen on Co3O4/SiO2 Catalyst

Author

Shen, Yang Yi, Zhu, Ming Qiao, Du, Jin Pei, Yang, Yang Yang, and Tang, Yue

Abstract

A series of supported catalysts Co3O4/SiO2 were prepared by deposition precipitation method. ICP-AES, XRD and TEM data revealed that the Co3O4 active site was highly dispersed on the surface of SiO2. The catalysts were evaluated for selective epoxidation of styrene with molecular oxygen. The results showed that the catalysts were of good catalytic activity for styrene epoxidation and many factors had an evident effect on the catalytic epoxidation activity. The best catalyst was 3% Co3O4/SiO2 on which 96.3% conversion of styrene and 52.7% selectivity of styrene oxide were obtained under the flow rate of O2 20mL/min, 100℃, 10h with solvent.

Published
2011
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