检索结果-内蒙古大学图书馆

Corrosion behavior of ZrB2ceramics in H2SO4and NaOH solutions

Rengong Jingti Xuebao/Journal of Synthetic Crystals 2015年 44卷 30-34and46页

作者： Yang, Hai-Tao Li, Jun-Guo Wang, Bo Chen, Liang Shen, Qiang Zhang, Lian-Meng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

The corrosion behavior of ZrB2ceramics in closed system was studied in 4 mol·L-1H2SO4and 14 mol·L-1NaOH solutions. The phase composition and microstructure were investigated by X-ray diffraction (XRD) and field emmision scanning electron microscope (FE-SEM). The results show that the electrochemical corrosion of ZrB2ceramics in H2SO4or NaOH solution is controlled by the anode. ZrB2ceramics in H2SO4are corroded along the crystallographic plane (101) which causes that the corrosion of the end surface (001) of the grain is more serious than the side face (100);the grains of which z axis is not parallel to the polished surface will be corroded into the hexagonal pyramid;with the gradual corrosion, the end surface (001) of the grains of which z axis is parallel to the polished surface are exposed, so that the grains perimeter are corroded into the jagged. ZrB2ceramics in NaOH solution are corroded along the crystallographic plane (110) which causes that both the end surface (001) and the side face (100) of the grain are seriously corroded;the grains of which z axis are not parallel to the polished surface will be corroded into the acicular and the grains of which z axis is parallel to the polished surface will be corroded into the palisaded. © 2015, Chinese Ceramic Society. All right reserved.

关键词： Sodium hydroxide

来源：评论

学校读者我要写书评

暂无评论

Preparation of NiO doped zirconia ceramics and exploration color-causing mechanism of nickel ion

引用

Rengong Jingti Xuebao/Journal of Synthetic Crystals 2015年 44卷 35-38and46页

作者： Zou, Li-Jie Liu, Hui Jin, Dong-Qin Chen, Fei Jin, Yu Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

A series of zirconia based ceramics were prepared by mixing different content of NiO and 3Y-ZrO2powder together, using pressureless sintering process under 1400. The influence of NiO content on phase composition, color of the ceramics and microstructure were studied. The relationship between microscopic structure and density was established. The relationship between the UV-VIS absorption peak caused by the electron transition and the material color was researched. Phase composition was tested by XRD, SEM and ultraviolet-visible spectrophotometer. Results show that the main phase of the materials are tetragonal and cubic phase zirconia. Nickel oxide does not react with zirconium oxide generating new phase. With the increase of the content of the NiO, diffraction peak intensity of NiO increases. Sintering at 1400, crystal grain grows closely and grain size is uniform. The density is about 99.8% at that temperature. After doping NiO, zirconia ceramics show green. The ultraviolet-visible absorption peaks are in 700-750 nm and 300-400 nm, corresponding to the energy level transition of Ni2+. © 2015, Chinese Ceramic Society. All right reserved.

关键词： Color

来源：评论

学校读者我要写书评

暂无评论

Preparation of B4C-ZrB2-SiC ternary eutectic composites by arc melting and their properties

引用

materials Research Innovations 2015年 19卷 26-29页

作者： Tu, R. Li, N. Li, Q.Z. Zhang, S. Goto, T. Zhang, L.M. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan430070 China Institute for Materials Research Tohoku University Sendai980-8577 Japan

B4C-ZrB2-SiC composites were synthesised by arc melting in Ar atmosphere using B4C, ZrB2 and β-SiC powders as starting materials. The ternary eutectic composition of 40B4C-20ZrB2-40SiC (mol-%) was first identified and a lamellar eutectic texture was observed. SiC and ZrB2 grains about 1 μm in thickness were uniformly dispersed in B4C matrix of B4C-ZrB2-SiC eutectic composite. B4C (003) and ZrB2 (100) planes were perpendicular to the growth direction. The Vickers hardness of B4C-ZrB2-SiC ternary eutectic composite was 30-34 GPa. The fracture toughness of B4C-ZrB2-SiC composite increased with the decrease of B4C content and the rise of ZrB2 content. © 2015 W. S. Maney & Son Ltd.

关键词： Silicon carbide

来源：评论

学校读者我要写书评

暂无评论

synthesis and optoelectronic properties of a novel molecular semiconductor of dithieno[5,6-b:11,12-b']coronene-2,3,8,9-tetracarboxylic tetraester

引用

Chinese Chemical Letters 2014年第1期25卷 65-68页

作者： Chun Zhan You-Yu Jiang Ming-Yan Yang Lu-Hua Lu Sheng-Qiang Xiao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology WUT-USG Joint Laboratory of Advanced Optoelectronic Materials and Devices Wuhan University of Technology Center for Chemical and Materials Engineering Wuhan University of Technology

A facile procedure for the synthesis ofdithieno[5,6-b：11,12-b＇]coronene-2,3,8,9-tetracarboxylic tetra（2- ethylhexyl）ester （DTCTI＇E-EH） from readily available perylene-3,4,9,10-tetracaroboxylic dianhydride is described. The electronic properties of DTCTTE-EH were elucidated on the basis of UV-vis spectra, emission spectrum and electrochemical measurement, which demonstrate that DTCTTE is a new class of components for promising semiconducting materials.

关键词： Polycyclic aromatic molecules Coronene tetracarboxylic tetraester Semiconductor Optoelectronic property

来源：评论

学校读者我要写书评

暂无评论

RGD Gifted PDLLA-PRGD Conduits Promotes the Sciatic Nerve Regeneration

引用

Journal of Wuhan University of technology(materials Science) 2014年第3期29卷 620-625页

作者：方晓青邱彤 XIE Lijuan YIN Yixia LI Binbin YAN Qiongjiao DAI Honglian WANG Xinyu LI Shipu Department of Paediatrics Wuhan General Hospital of Guangzhou Military Biomedical Materials and Engineering Center Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Schwann cells play a key role in peripheral nerve growth and regeneration. The aim of this study was to evaluate the effects of RGD peptides on Schwann cell behavior, and to identify the effects of the modified PDLLA films with RGD in vivo. The results revealed that RGD coating with the concentration of 100-500 ug/mL promoted the cell proliferation and boosted the cell migration. Molecularly, RGD coating also enhanced the expression of the proliferation related genes （c-fos and c-jun） and the cell behavior related genes （actin, tublin, tau and MAP1） at first stages of the seeding, which is similar to the effects from laminin coating. In vivo, RGD addition improved the recovery efficiency of the transected nerve in regard of the more survived Schwann cells in vivo and the formation of more mature myelin sheath. Taken together, RGD peptides are good candidates to enhance the biocompatibility of the biomaterials and facilitate the peripheral nerve regeneration by prompting responses in Schwann ceils.

关键词： ROD Schwann cells cell behavior PDLLA-PRGD conduit sciatic nerve regeneration

来源：评论

学校读者我要写书评

暂无评论

Preparation of ultra-thick β-SiC films using different carbon sources

引用

materials Research Innovations 2015年 19卷 397-402页

作者： Tu, R. Zheng, D.H. Cheng, H. Han, M.X. Zhang, S. Goto, T. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai980-8577 Japan

Polycrystalline ultra-thick β-SiC films have been grown on graphite substrates via halide chemical vapour deposition method by using tetrachlorosilane (SiCl4) as silicon source, whereas methane (CH4), acetylene (C2H2), propane (C3H8) and liquid petroleum gas as carbon sources, respectively. The effects of deposition temperature (Tdep) and carbon source on the orientations, microstructures and deposition rate (Rdep) were investigated. Rdep of β-SiC films dramatically increased with increasing Tdep. In the case of C2H2, it provides a sufficient source of carbon and results in the maximum Rdep under identical Tdep compared to the other carbon sources. Conversely, CH4 decomposition in the Si-C-Cl-H system was proved to be inactive with SiCl4 in the entire range of Tdep. The orientations of the β-SiC films transform from 〈111〉 to random to 〈110〉 with increasing Tdep, and highly 〈111〉- and 〈110〉-oriented β-SiC films were fabricated at 1473 and 1773 K, respectively. © 2015 W. S. Maney & Son Ltd.

关键词： Microstructure

来源：评论

学校读者我要写书评

暂无评论

Quantitative detection of molds counts in cigarette cut tobacco at early stages by an electronic nose

引用

Sensor Letters 2014年第1期12卷 56-63页

作者： Zhu, Chao Huang, Kaijin Yuan, Fangli Xie, Changsheng State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Science Beijing 100190 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Cigarette cut tobacco mildew will cause tremendous economic loss and human health. An improved electronic nose was developed to detect cigarette cut tobacco mildew at early stages. After storing 96 h at 30 °C and 90% RH, the molds counts in dry cigarette cut tobacco was 1.6×104 CFU/g which is much higher than the mildew threshold of 2.5×103 ˜ 3.0×103 CFU/g. Cluster analysis and loading analysis were applied to optimize the gas sensor array. For the results of canonical discriminant function analysis (DFA), both of the original sensor array and the optimized sensor array had high overall correct classification rate (96.7%). For the results of multilayer perceptron neural network (MLPNN), the correlation coefficient of the real molds counts and the prediction molds counts increased from 0.99508 to 0.99612 and the average relative error decreased from 0.42% to 0.25%. The excellent performance of the electronic nose makes it a good choice to play as a rapid and effective method to quantitatively detect molds counts in cigarette cut tobacco at early stages. Copyright © 2014 American Scientific Publishers.

关键词： Tobacco

来源：评论

学校读者我要写书评

暂无评论

Effect of 2,2′-dipyridyl on the plating rate, microstructure and performance of copper-coated tungsten composite powders prepared using electroless plating

Effect of 2,2′-dipyridyl on the plating rate, microstructur...

引用

作者： Chen, Wenshu Luo, Guoqiang Li, Meijuan Shen, Qiang Wang, Chuanbin Zhang, Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Highly pure copper-coated tungsten powders were successfully prepared in fixed quantities using electroless plating, via the addition of an appropriate amount of 2,2′-dipyridyl to the plating bath. The effect of 2,2′-dipyridyl on the plating Cu rate, microstructure and performance of the coated Cu layer was studied systematically. Changing the concentration of 2,2′-dipyridyl had significant effects on the plating Cu rate, surface morphology, average grain size, purity and quantity of coated Cu. With a 2,2′-dipyridyl concentration of approximately 20-40 mg/L, the coated Cu was highly pure, with very little oxygen content (less than 0.1 wt.%). The complexation of the 2,2′-dipyridyl with cuprous ions and the absorption of the 2,2′-dipyridyl on the coated Cu surface can explain these findings. With increase in the concentration of 2,2′-dipyridyl in the plating bath, the plating Cu rate, microstructure and performance of the coated Cu layer changed steadily, indicating that the complexation and absorption of 2,2′-dipyridyl gradually approached a saturation level. High thermal performance W-Cu composite can be fabricated by using these composite powders. © 2014 Published by Elsevier B.V.

关键词： Electroless plating

来源：评论

学校读者我要写书评

暂无评论

Effect of flow-field dimensions on the formability of Fe-Ni-Cr alloy as bipolar plate for PEM Fuel Cell 20

Effect of flow-field dimensions on the formability of Fe-Ni-...

引用

20th World Hydrogen Energy Conference, WHEC 2014

作者： Hu, Qinghui Zhang, Dongming Fu, Hao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

The Fe-Ni-Cr alloy is a potential material as bipolar plate for proton exchange membrane fuel cell, and the stamped metal bipolar plate is a promising candidate for the traditional graphite due to the advantages of mass production, low cost and excellent performance. The flow-channel geometrical dimensions, including channel width, rib width, channel depth, draft angle and radius of the fillet, have vital influences on the formability of the alloy during the stamping process. This paper numerically investigates how the serpentine flow-field geometrical dimensions affect the formability of the alloy plate by the finite element software. The finite element model was established with different channel dimensions in this study. The results predict the proper scope of flow-field dimension for alloy used for bipolar plate, further, the stamping process of alloy plate is also optimized to obtain better performance.

关键词： Proton exchange membrane fuel cells (PEMFC)

来源：评论

学校读者我要写书评

暂无评论

Theoretical Study on the C-H Activation in Decarbonylation of Acetaldehyde by NiL_2(L=SO_3CH_3) Using Density Functional Theory

引用

Journal of Wuhan University of technology(materials Science) 2014年第6期29卷 1170-1172页

作者：刘红飞 JIA Tiekun MIN Xinmin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Physics and Electrical Information Engineering Ningxia University Department of Materials Science and Engineering Luoyang Institute of Science and Technology

Density functional theory calculations were carried out to explore the potential energy surface（PES） associated with the gas-phase reaction of Ni L2（L=SO3CH3） with acetone. The geometries and energies of the reactants, intermediates, products and transition states of the triplet ground potential energy surfaces of [Ni, O, C2, H4] were obtained at the B3LYP/6-311＋＋G（d,p） levels in C,H,O atoms and B3LYP/ Lanl2 dz in Ni atom. It was found through our calculations that the decabonylation of acetaldehyde contains four steps including encounter complexation, C-C activation, aldehyde H-shift and nonreactive dissociation. The results revealed that C-C activation induced by Ni L2（L=SO3CH3） led to the decarbonylation of acetaldehyde.

关键词： density functional theory decarbonylation transition state energy C-C activation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：