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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)

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Fabrication and properties of W-Cu functionally graded material by tape-casting

Fabrication and properties of W-Cu functionally graded mater...

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5th International Symposium on advanced Ceramics, ISAC 2013 and 3rd International Symposium on advanced synthesis and processing technology for materials, ASPT 2013

作者： Luo, Guoqiang Dai, Yang Liu, Shulong Yu, Kan Shen, Qiang Zhang, Lianmeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9783038351306

In this paper, the W-Cu functionally graded material (FGM) was prepared by using the non- Aqueous tape-casting technique combined with vacuum hot-pressing sintering. The graded composite material with high density, uniform transition and graded component was designed by 7 layers with the copper content range from 40 to 100 wt. %. Then the structures and properties of the composite were characterized. The scanning acoustic microscope (SAM) results for the W-Cu graded material showed that the interface between different layers was of high smoothness and parallel. The SEM-EDS results of cross section show that the W and Cu content changed gradually along the laminating direction after sintering. The equivalent electrical conductivity and the equivalent thermal conductivity of the W-Cu graded material were 0.3976×108 S/m and 323.5 W/(m·K), respectively, which were much higher than that of the W-40 wt. % Cu homogeneous composite. The Vickers hardness of the high tungsten content surface and the high copper surface were 163 HV and 80 HV, respectively, which were same with that of the homogeneous material. © (2014) Trans Tech Publications, Switzerland.

关键词： Functionally graded materials

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Investigation of stamping process of metallic bipolar plates in PEM fuel cell - Numerical simulation and experiments

Investigation of stamping process of metallic bipolar plates...

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作者： Hu, Qinghui Zhang, Dongming Fu, Hao Huang, Kaikai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Flow channel in bipolar plate for PEMFC has the function of transporting the fuel and oxygen and water. Stamping process for flow channel on metallic bipolar plates is an economic and convenient method for mass production. It is extremely important to predict and prevent the tearing, wrinkling, thinning, skid mark and spring back in stamping process. In this study, finite element method is used to predict the imperfection and analyze thickness variation during the stamping process. Dynaform software is employed to predict the performance of a stamping process. Forming Limit Diagrams are used to determine the safe limit of the metallic bipolar plates. In simulation, the dimension of flow channels, punch speed, radius of punch and die and draft angle were selected as variable process parameters. Experiments were conducted to compare with the simulation results. It is demonstrated that the simulation results are in good agreement with the experimental ones for ss304 metal sheets. So simulation model could be employed as a predictive tool to provide optimal parameters for better performance of the stamping process. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Skids

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The activity influence of isopropyl alcohol for flat plant Pt and Pt/C electrode

The activity influence of isopropyl alcohol for flat plant P...

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2014 Electrochemical Conference on Energy and the Environment, ECEE 2014

作者： Sun, Shuang Pan, Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9781607685555

Pt, as a precious metal, is an important component of fuel cell catalyst, however the impurities in polymer electrolyte membrane fuel cell(PEMFC) has a great influence on the electrochemical activity. This paper studies the electrochemical activity influence of isopropyl alcohol(IPA) on a flat plate Pt and Pt/C electrodes by means of cyclic voltammograms and oxygen reduction test methods, the influence of the research results show that the addition of isopropyl alcohol will not change the stripping potentials of hydrogen, but it will obviously block the absorption of proton at the Hads potentials, and the biggest oxidation current on the Pt/C electrode was larger than that on the flat plate Pt electrode;we also find that the present of IPA reduces the limit current density of the plate Pt electrode, thus further influence on the performance of the catalyst in PEMFC. © The Electrochemical Society.

关键词： Proton exchange membrane fuel cells (PEMFC)

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Effects of the Interaction between Hydroxyapatite Nanoparticles and Hepatoma Cells

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Journal of Wuhan University of technology(materials Science) 2014年第3期29卷 635-642页

作者：尹美珍 XU Weiguo CUI Bingcun 戴红莲 HAN Yingchao YIN Yixia LI Shipu School of Medicine Hubei Polytechnic University Tongji Hospital Tongji Medical College Huazhong University of Science and Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Biomedical Materials and Engineering Center Wuhan University of Technology

To gain a better understanding of the anticancer effects of hydroxyapatite （HAP） nanoparticles in vivo and in vitro, the effects of the interaction of HAP nanoparticles with hepatoma cells were explored. HAP nanoparticles were prepared by homogeneous precipitation and characterized by laser particle analysis and transmission electron microscopy （TEM）. HAP nanoparticles were observed to be uniformly distributed, with rod-like shapes and diameters in the range of 42.1-87.1 nm. Overnight attached, suspended, and proliferating Bel-7402 cells were incubated with HAP nanoparticles. Inverted microscopy observation revealed that HAP nanoparticles with a cell membrane showed good adsorption. TEM demonstrated that HAP nanoparticles were present on the surface of cells, continuously taken up by cells through endocytosis, and transported in vesicles close to the nucleus. Fluorescence microscopy showed that the concentrations of intracellular Ca2＋ labeled with Fluo-3 calcium fluorescent probe were significantly enhanced. In addition, inverted microscopy observation revealed that suspended cells treated with HAP nanoparticles did not adhere to the culture bottle, resulting in cell death. After the overnight attached cells were treated with HAP nanoparticles for 96 h with increasing doses of HAP nanoparticles, inverted microscopy observation revealed that cell proliferation was slowed and ceU-ceU adhesion was weakened. Feulgen staining and image analysis indicated that the nuclear DNA content of the cells was markedly reduced, and argyrophilic nucleolar organizer region （AgNOR） staining and image analysis indicated that the number of AgNORs was significantly decreased. Therefore, hepatoma cells brought about the adsorption, uptake, transport and degradation of HAP nanoparticles. In addition, HAP nanoparticles affected hepatoma cells with regard to cell-cell adhesion, cell and extracellular matrix adhesion, and DNA and protein synthesis; thus inhibiting cell proliferation. This und

关键词： hydroxyapatite nanoparticles hepatoma cells interaction effects cell adhesion

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Novel 3DOM BiVO4/TiO2 nanocomposites for highly enhanced photocatalytic activity

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Journal of materials Chemistry A 2015年第42期3卷 21244-21256页

作者： Zalfani, Meryam Van Der Schueren, Benoit Hu, Zhi-Yi Rooke, Joanna C. Bourguiga, Ramzi Wu, Min Li, Yu Van Tendeloo, Gustaaf Su, Bao-Lian 61 rue de Bruxelles NamurB-5000 Belgium Laboratoire de Physique des Matériaux: Structure et Propriétés Groupe Physique des Composants et Dispositifs Nanométriques Faculté des Sciences de Bizerte University of Carthage Jarzouna-Bizerte7021 Tunisia University of Antwerp Groenenborgerlaan 171 AntwerpB-2020 Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Luoshi Road 122 WuhanHubei430070 China Department of Chemistry and Clare Hall College University of Cambridge Lensfield Road Cambridge United Kingdom

Novel 3DOM BiVO4/TiO2 nanocomposites with intimate contact were for the first time synthesized by a hydrothermal method in order to elucidate their visible-light-driven photocatalytic performances. BiVO4 nanoparticles and 3DOM TiO2 inverse opal were fabricated respectively. These materials were characterized by XRD, XPS, SEM, TEM, N2 adsorption-desorption and UV-vis diffuse (UV-vis) and photoluminescence spectroscopies. A references for comparison, a physical mixture of BiVO4 nanoparticles and 3DOM TiO2 inverse opal powder (0.08:1), and a BiVO4/P25 TiO2 (0.08:1) nanocomposite made also by the hydrothermal method were prepared. The photocatalytic performance of all the prepared materials was evaluated by the degradation of rhodamine B (RhB) as a model pollutant molecule under visible light irradiation. The highly ordered 3D macroporous inverse opal structure can provide more active surface areas and increased mass transfer because of its highly accessible 3D porosity. The results show that 3DOM BiVO4/TiO2 nanocomposites possess a highly prolonged lifetime and increased separation of visible light generated charges and extraordinarily high photocatalytic activity. Owing to the intimate contact between BiVO4 and large surface area 3DOM TiO2, the photogenerated high energy charges can be easily transferred from BiVO4 to the 3DOM TiO2 support. BiVO4 nanoparticles in the 3DOM TiO2 inverse opal structure act thus as a sensitizer to absorb visible light and to transfer efficiently high energy electrons to TiO2 to ensure long lifetime of the photogenerated charges and keep them well separated, owing to the direct bandgap of BiVO4 of 2.4 eV, favourably positioned band edges, very low recombination rate of electron-hole pairs and stability when coupled with photocatalysts, explaining the extraordinarily high photocatalytic performance of 3DOM BiVO4/TiO2 nanocomposites. It is found that larger the amount of BiVO4 in the nanocomposite, longer the duration of photogenerated charg

关键词： Bismuth compounds

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Microstructural evolution and mechanism of grain growth in magnesia ceramics prepared by high pressure and temperature with ultra-high heating rate

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Science China(Technological Sciences) 2014年第6期57卷 1085-1092页

作者： LIU JiangHao FU ZhengYi WANG WeiMin ZHANG JinYong WANG Hao WANG YuCheng LEE SooWohn NIIHARA Koichi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Environmental Engineering Sun Moon University Extreme Energy-Density Research Institute Nagaoka University of Technology1603-1 KamitomiokaNagaokaNiigata 940-2188Japan

The fast densification method of combustion reaction plus quick pressing was adopted to prepare nanocrystalline *** densification process of magnesia compact with a particle size of 100 nm was investigated,under the applied pressure of up to 170 MPa,and the temperature range of 1740–2080 K with ultra-high heating rate(above 1700 K/min).High-purity magnesia ceramics with a relative density of 98.8%and an average grain size of 120 nm was obtained at 1740 K,and the grain growth during the densification process was effectively *** characteristic morphology of evaporation-condensation was observed in the compact prepared at 2080 K,which revealed the actual process of mass transfer by gas ***,the investigation on the microstructure evolution and mechanism of grain growth was carried out,on the basis of as-preserved nanocrystalline *** result indicated that the grain growth of the nanocrystalline MgO was controlled by the mechanism of evaporation-condensation rather than surface ***,the pressure had an influence of restraining the grain growth based on solid diffusion and strengthening the effect of gas diffusion with the increasing *** the particular conditions,there existed an appropriate temperature for the densification of nanocrystalline magnesia,while the excessive temperature would exaggerate grain growth and impede densification.

关键词： grain growth densification heating rate evaporation-condensation surface diffusion nanocrystalline ceramics

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Electrical Characteristics: High—Performance Solar‐Blind Deep Ultraviolet Photodetector Based on Individual Single‐Crystalline Zn2GeO4Nanowire (Adv. Funct. Mater. 5/2016)

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advanced Functional materials 2016年第5期26卷

作者： Xing Zhou Qi Zhang Lin Gan Xin Li Huiqiao Li Yue Zhang Dmitri Golberg Tianyou Zhai State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology (HUST) Wuhan 430074 P. R. China State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing (USTB) Beijing 100083 P. R. China International Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science (NIMS) Namiki 1‐1 Tsukuba Ibaraki 305‐0044 Japan

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Mussel‐Directed synthesis of Nitrogen‐Doped Anatase TiO2

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Angewandte Chemie 2016年第9期128卷

作者： Jingjing Xie Hao Xie Bao‐Lian Su Yi‐bing Cheng Xiaodong Du Hui Zeng Menghu Wang Weimin Wang Hao Wang Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P.R. China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 P.R. China Laboratory of Inorganic Materials Chemistry University of Namur B-5000 Namur Belgium Department of Materials Engineering Monash University Victoria 3800 Australia Department of Pearl Research Guangdong Ocean University Zhanjiang 524025 P.R. China

Structure‐forming processes leading to biominerals are well worth learning in pursuit of new synthetic techniques. Strategies that attempt to mimic nature in vitro cannot replace an entire complex natural organism, requiring ingenuity beyond chemists′ hands. A “bioprocess‐inspired synthesis” is demonstrated for fabrication of N‐doped TiO 2 materials at ambient temperature by direct implantation of precursor into living mussels. The amorphous precursor transforms into N‐doped anatase TiO 2 with a hierarchical nanostructure. Synthetic TiO 2 exhibits high phase stability and enhanced visible‐light photocatalytic activity as a result of modifications to its band gap during in vivo mineralization. Intracellular proteins were found to be involved in TiO 2 mineralization. Our findings may inspire material production by new synthetic techniques, especially under environmentally benign conditions.

关键词： Raumtemperatur Biologisch inspirierte Synthesen Intrazelluläre Proteine Organismen Stickstoffdotiertes TiO2

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Carbon nanotubes suspended in ethylene glycol yield nanofluids with enhanced heat transfer properties 13

Carbon nanotubes suspended in ethylene glycol yield nanoflui...

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13th International Conference on Simulation and Experiments in Heat and Mass Transfer, HT 2014

作者： Cheng, H.B. Ma, W.T. Hu, W. Wu, J.F. Xiao, J. Chen, Z.B. Zhang, Q.J. Wereley, N.M. State Key Laboratory of Advanced technology for Materials Synthesis and Processing Wuhan University of Technology China Department of Aerospace Engineering University of Maryland United States

ISBN: (纸本)9781845647940

Nanofluids (NFs) consisting of carbon nanotubes (CNTs) suspended in ethylene glycol (EG) were synthesized, and their stability and thermal conductivity enhancement rate were investigated. Stability of the CNT/EG-based NFs was enhanced by adding gum Arabic (GA). The increase in suspension stability was experimentally characterized using static and centrifugal testing processes. The mechanisms of GA in enhancing the fluid stability were characterized and the optimal mass ratio of GA to CNT was found to be about 11% by weight. Thermal conductivity was measured for varying CNT volume fraction under different fluid temperatures, and a nearly linear relationship between the thermal conductivity and the CNT volume fraction and temperature was observed. © 2014 WIT Press.

关键词： Stability

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