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synthesis of single-crystalline silicon nitride (α-Si 3N4) nanowires with controlled diameters by nitriding cryomilled nanocrystalline silicon powder

Synthesis of single-crystalline silicon nitride (α-Si 3N4) ...

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作者： Chen, Fei Wang, Zhihao Shen, Qiang Huang, Zhixiong Zhang, Lianmeng Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology Wuhan 430070 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9781605112565

In the present work, silicon nitride nanowires (SNNWs) have been synthesized via nitriding cryomilled nanocrystalline silicon powder. The silicon powder exhibits a fine polycrystalline structure after the cryomilling process, with an average grain size of 25 to 125 nm at various cryomilling times. The SNNWs that form after the nitridation of the cryomilled silicon powder exhibit single crystal structure and are 20 to 100 nm in diameter and ∼10 μm in length. The diameter of the nanowires is in agreement with the grain size of the cryomilled Si powder. Microstructural characterization reveals that the as-synthesized nanowires have a hexagonal structure and their primary growth direction is along the [0001] direction. The formation of the Si-N-Si bond during the cryomilling process, as investigated theoretically with density functional theory, promotes the subsequent synthesis of the α-Si 3N4 nanowires. The mechanism for nanowire formation appears to be a vapor-solid (VS) reaction. © 2010 materials Research Society.

关键词： Nanocrystals

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Investigation on the effect of test parameters on small punch creep tests by finite element method

Investigation on the effect of test parameters on small punc...

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10th International Symposium on Multiscale, Multifunctional and Functionally Graded materials, MM and FGMs

作者： Wang, JianPing Chen, Gang Zhai, PengCheng Zhang, QingJie School of Architecture Engineering Guizhou University for Nationalities Guiyang 550025 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

ISBN: (纸本)0878493077

The small punch creep (SP-C) test technique is a new method which is applied to evaluate the high temperature creep properties of materials by using miniature specimen. In the present paper, the Finite Element Method (FEM) is employed to simulate the SP-C test in order to investigate the effects of test parameters on testing results of the SP-C test. In this attempt, we perform systematic numerical simulations of SP-C tests by changing friction coefficient, specimen thickness, the diameter of punch ball and the inner diameter of lower die, and discuss the effects of the variation of test parameters on test results in detail. The resulting regression equations for assessing the effects of testing parameters on test results are obtained. It is found that the test results are influenced significantly by the specimen thickness, the diameter of punch ball and the inner diameter of lower die. However, the effects of friction coefficient on the results of the SP-C test can be neglected. © (2010) Trans Tech Publications.

关键词： Creep

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V2O5/polypyrrole core-shell nanotubes for Gas sensor

V2O5/polypyrrole core-shell nanotubes for Gas sensor

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IEEE International Nanoelectronics Conference (INEC)

作者： Wei Jin Wen Chen Yu Lu Chunxia Zhao Ying Dai State Key Laboratory of Advanced Technology Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology Wuhan China State Key Laboratory of Advanced Technology Materials Synthesis and Processing Wuhan University of Technology China

ISBN: (纸本)9781424435432;9781424435449

Polypyrrole-coated V 2 O 5 nanotubes hybrid materials have been synthesized through an in situ polymerization of pyrrole monomers in the presence of prepared V 2 O 5 nanotubes. The hybrids were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Experimental data showed that polypyrrole was uniformly coated on the surface of the V 2 O 5 nanotubes, and the polypyrrole coating is 30 nm thick. Gas sensing tests showed that the hybrids possessed very high sensitivity to ethanol gas at room temperature, implying its potential application for gas sensors.

关键词： Nanotubes Polymers Scanning electron microscopy Gas detectors materials science and technology Transmission electron microscopy Educational technology Composite materials Temperature sensors Conducting materials

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Chirality‐Triggered Protein Adsorption: Chiral Design for Polymeric Biointerface: The Influence of Surface Chirality on Protein Adsorption (Adv. Funct. Mater. 17/2011)

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advanced Functional materials 2011年第17期21卷

作者： Xing Wang Hui Gan Taolei Sun Physicalisches Institut Muenster University Wilhelm‐Klemm‐Str. 10 D‐48149 Muenster Germany Beijing Institute of Transfusion Medicine Beijing 100850 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

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Microstructures of Nanotubes Reinforced Alumina Fabricated by Two Fast-Sintering Methods

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IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： L W Huang Z Y Fu H Wang S W Lee K Niihara State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Extreme Energy-Density Research Institute Nagaoka University of Technology Niigata 940-2188 Japan

Spark plasma sintering (SPS) and Self-propagating High-temperature synthesis/ quick pressing (SHS/QP) methods were used to fabricate nanotubes reinforced alumina. The difference in microstructure was discussed. In the SHS/QP process, the maximum densification temperature is 1660°C and the heating rate is about 1600°C /min. The whole densification process in SHS/QP is very short, which is much beneficial to protect the nanotubes and restrain the growing of grains. The fracture toughness of the sample prepared by SHS/QP is up to 4.9MPam½ for 1mass% CNTs/Al2O3 composites, which shows excellent toughening effects of nanotubes.

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Improved carbon nanotube supported Pt nanocatalyts with lyophilization method

Improved carbon nanotube supported Pt nanocatalyts with lyop...

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IEEE International Nanoelectronics Conference (INEC)

作者： Daping He Shichun Mu Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

ISBN: (纸本)9781424435432

The lyophilization method was used to enhance platinum (Pt) nanoparticle distribution on single-walled cabon nanotube (SWCNT). The results indicate that this method is very available to uniformly disperse nanotubes and effectively prevent Pt metal particles from agglomeration. The Platinum nanoparticle size ranging from 2 to 5 nm in diameter and uniformly deposited on SWCNT characterized by both transmission electron microscopy (TEM) and X-ray diffraction (XRD), instead, Pt/ SWCNT catalysts fabricated by drying method present a lower dispersion degree compared with that by lyophilization method. The as-prepared catalysts have higher electrochemical active surface area and higher ORR activity as compared to that by drying method characterized by cyclic voltammetry (CV) and oxygen reduction reaction (ORR).

关键词： Carbon nanotubes Nanoparticles Fuel cells Platinum Pollution measurement Carbon dioxide Helium Laboratories Organic materials Dispersion

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SiO2-CNTs doped nafion membranes applied in high temperature PEM fuel cells

SiO2-CNTs doped nafion membranes applied in high temperature...

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IEEE International Nanoelectronics Conference (INEC)

作者： Feng Xu Shichun Mu Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

ISBN: (纸本)9781424435432;9781424435449

We prepared a novel hybrid membrane by doping recast Nafion @ membrane with SiO 2 -CNTs composites where carbon nanotubes (CNTs) were decorated with SiO 2 nano-particles. SiO 2 -CNTs were prepared via sol-gel method, and then mixed with nafion resin through sonication. Hydrophilic SiO 2 nano-particles were chosed to increase the water uptake of hybrid membrane, and the CNTs were chosed to improve the mechanical property of hybrid membrane. A series of tests show that water uptake and thermal performance¿two key performance of proton exchange membrane (PEM) are improved.

关键词： Biomembranes Fuel cells Protons Carbon nanotubes Resins Testing Temperature dependence Humidity Laboratories Composite materials

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Annealing effects on structure and mechanical properties of CoCrFeNiTiAlx high-entropy alloys

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IOP Conference Series: materials Science and Engineering 2011年第1期20卷

作者： K B Zhang Z Y Fu J Y Zhang W M Wang S W Lee K Niihara State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Engineering SunMoon University Asan ChungNam 336-708 South Korea Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Nagaoka Niigata 940-2188 Japan

Novel CoCrFeNiTiAlx(x:molar ratio, other elements are equimolar) high-entropy alloys were prepared by vacuum arc melting and these alloys were subsequently annealed at 1000 °C for 2 h. The annealing effects on structure and mechanical properties were investigated. Compared with the as-cast alloys, there are many complex intermetallic phases precipitated from the solid solution matrix in the as-annealed alloys with Al content lower than Al1.0. Only simple BCC solid solution structure appears in the as-annealed Al1.5 and Al2.0 alloys. This kind of alloys exhibit high resistance to anneal softening. Most as-annealed alloys possess even higher Visker hardness than the as-cast ones. The as-annealed Al0.5 alloys shows the highest compressive strength while the Al0 alloy exhibits the best ductility, which is about 2.6 GPa and 13%, respectively. The CoCrFeNiTiAlx high-entropy alloys possess integrated high temperature mechanical property as well.

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Photocatalytic decompositions of gaseous HCHO over Ag/TiO2 nanotube arrays

Photocatalytic decompositions of gaseous HCHO over Ag/TiO2 n...

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IEEE International Nanoelectronics Conference (INEC)

作者： Jingjing Du Wen Chen Chunxia Zhao Ying Dai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology Wuhan China

ISBN: (纸本)9781424435432;9781424435449

Highly ordered TiO 2 nanotube arrays prepared by electrochemical anodization gets considerable interest as a practical air purifier, since the nanotube arrays can form a TiO 2 film with a porous surface and straight gas diffusion channel. Here, we investigate photocatalytic decompositions of HCHO over TiO 2 and Ag/TiO 2 nanotube arrays. Compared with the pure TiO 2 nanotube arrays with similar thickness and geometric area, the results showed that Ag loading TiO 2 nanotube arrays within a certain range could significantly improve the degradation rate of HCHO, the main product of HCHO degradation was detected to be CO 2 .

关键词： Degradation Titanium Oxidation materials science and technology Hafnium Temperature Electrodes Annealing Nanoparticles Inductors

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Structural Analysis and Optimal Design for Water Tube Panel in an Alkali Recovery Boiler

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Engineering（科研） 2010年第5期2卷 353-359页

作者： Zaili Zhao Jinsheng Xiao Ying Wu Xiaojun Zhang Zhiming Wang School of Energy and Power Engineering Wuhan University of Technology School of Automobile Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology W

Alkali recovery aiming at recovering NaOH is the best available technology in China's pulp and paper industry;an alkali recovery boiler is a popular one among all alkali recovery units. For the purpose of designing the most reasonable tube-panel of an evaporator in a 1500 t/d alkali recovery boiler, a total of 8 kinds of cases are put forward for finite element analysis. The modeling, meshing and calculation are carried out for each case. The stress values and their distribution rules are revealed in this paper. The slotting size for the water tubes panel is analyzed by using the optimum design module of ANSYS. After all cases are compared with each other, the optimal one is developed and exemplified in conclusion.

关键词： Alkali Recovery Boiler Water Tubes Panel Finite Element Thermal Stress Optimum Design

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