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2005 MRS Spring Meeting

作者： Dai, Ying Zhou, Long Q. Sun, Yue L. Chen, Wen Zhang, Yue State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Department of Materials Physics University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)1558998306

Highly oriented plate-like rod/tube arrays of ZnO arc synthesized by a solution-based approach at low temperature. The ZnO rod/tube arrays grow oriented vertically on silicon substrate and the intersectant ZnO nanosheets stand on the backbones of ZnO rods/tubes. The constructions of plate-like rod or tube arrays depend on the processing conditions. The growth mechanisms are investigated based on the nucleation and growth process. The initial ZnO film formed on substrate is crucial for the growth of ZnO rods/tubes perpendicular to the substrate. The nanosheets grow around the ZnO rods/tubes by the secondary nucleation and growth process. The ZnO tubes are formed by the etching of the ZnO polar faces. The novel ZnO structures are expected to have great potential for electronics, photoclectronics, sensors, and catalysis etc. © 2005 materials Research Society.

关键词： Zinc oxide

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A flow-based network monitoring system used for CSCW in design

A flow-based network monitoring system used for CSCW in desi...

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International Conference on Computer Supported Cooperative Work in Design

作者： Bo Yang Yi Li Yuehui Chen Runzhang Yuan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Science and Engineering China School of Information Science and Technology Jinan University China

ISBN: (纸本)184000025

technology trends in today's cooperative design environments are making it more and more important to monitor the network performance and ensure the network security. This paper describes the design and implementation of a distributed network traffic monitoring system based on embedded NetFlow hardware and software engines. The system architecture and design principles were introduced in the paper, some discussions were also presented about the NetFlow-based network monitoring technologies. The system had been successfully used to monitor highspeed campus networks at full wire speed without packet sampling in scenarios where commercial NetFlow collectors could not be used due to their limitations. Results show that this is an effective mechanism to identify, diagnose, and determine controls for network activities in CSCW environments and other network-based applications.

关键词： Monitoring Intelligent networks Telecommunication traffic Switches materials science and technology Sampling methods Probes Protocols Network synthesis Information science

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Recent development in nano and graded thermoelectric materials

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8th International Symposium on Multifunctional and Functionally Graded materials, FGM2004

作者： Zhang, Qing-Jie Tang, Xin-Feng Zhai, Peng-Cheng Niino, Masayuki Endo, Cyoji State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China Japan Aerospace Exploration Agency 1 Kimigaya-Koganezawa Kakuda Miyagi 981-1525 Japan Foundation for Promotion of Japanese Aerospace Technology 1-16-6 Izumi Chou Sendai Miyagi 981-3133 Japan

ISBN: (纸本)0878499709

In 2003, a joint research project entitled "Nano and graded thermoelectric materials/Photovoltaic-thermoelectric-wind power generation" is established in cooperation among research institutes from Japan and China. The major research institutes include state key laboratory of advanced technology for materials synthesis and processing (Wuhan University of technology, China), Shanghai Institute of Ceramics (Chinese Academy of Sciences, China), state key laboratory of New Ceramics and Fine processing (Tsinghua University, China), Japan Aerospace Exploration Agency (JAXA, Japan) and Foundation for Promotion of Japanese Aerospace technology (JAST, Japan). The main aim of this project is to develop a photovoltaic-thermoelectric-wind power generation system with high efficiency solar energy conversion. The key works of the project include: (1) fabrication of high efficiency nano thermoelectric materials with a maximum figure of merit Z≥ 1.3;(2) design and fabrication of nano graded thermoelectric material/component with efficiency conversion larger than 12% for wide temperature range and (3) design and construction of photovoltaic- thermoelectric coupled power generation system. The recent progress about the joint research project is reported in this paper. Emphasis is put on the mechanism, design and fabrication of high efficiency nano graded thermoelectric materials. The future research plan is also mentioned in brief.

关键词： Nanostructured materials

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Performance of hydrogen storage of carbon nanotubes decorated with palladium

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中国有色金属学会会刊：英文版 2004年第5期14卷 996-999页

作者：木士春唐浩林钱胜浩潘牧袁润章 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Carbon nanotubes（CNTs） decorated with palladium were synthesized and applied to hydrogen storage of gas phase. The results show that the amount of hydrogen storage of the decorated CNTs is up to 3.9%（mass fraction）, of which, almost 85% H2 can be desorbed at ambient temperature and pressure, while the non-decorated CNTs has a poor performance of hydrogen storage（only about 0.5%H2, mass fraction）. These indicate that it is feasible to enhance the performance of hydrogen storage of CNTs by further decoration with hydrogen-storing metals or alloys.

关键词：钯 CNTs 储氢合金碳 pb 储氢性能

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synthesis, Crystal Structures and Characterization of Ba5LiTiNb9O30

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Chinese Journal of Chemistry 2004年第5期22卷 434-436+406页

作者：刘韩星邹龙周建方亮张高科欧阳世翕 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Tech-nology Hubei 430070 China

A new niobate compound with the chemical composition of Ba5LiTiNb9O30 was synthesized by doping Li+ into the system BaO-TiO2-Nb2O5 in conventional solid state reaction method. The crystalline structure was determined by X-ray diffraction analysis (XRD). The results showed that crystal structure of Ba5LiTiNb9O30 belongs to tetrago-nal tungsten bronze structure with space group P4bm and its unit cell parameters: a=b=1.2512(2) nm, c=0.4008(5) nm. The microstructure of reaction products was observed by scanning electron microscopy (SEM).

关键词： niobate tungsten bronze structure XRD solid state reaction SEM

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synthesis, Crystal Structures and Characterization of Ba_5LiTiNb_9O_(30)

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Chinese Journal of Chemistry 2004年第5期22卷 434-436页

作者：刘韩星邹龙周建方亮张高科欧阳世翕 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Tech-nology Wuhan Hubei 430070 China

关键词： niobate tungsten bronze structure XRD solid state reaction SEM

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synthesis and Thermoelectric Properties of Polyaniline

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Journal of Wuhan University of technology(materials Science) 2003年第3期18卷 53-55页

作者：刘军 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Electrical conductivity and seebeck coefficient at different temperatures,and thermal conductivity at room temperature for various doped polyaniline (PAn) samples were measured,and the thermoelectric figure of merit ZT was *** effects of preparation methods and temperature on thermoelectric properties were *** results show that the electrical conductivity and the seebeck coefficient of PAn are strongly dependent on the preparation conditions and *** electrical conductivity becomes larger and the seebeck coefficient becomes smaller as PAn molecular weight *** by organic acid and HCl results in an increase in both electrical conductivity and Seebeck coefficient of PAn,and therefore ZT *** electrical conductivity increases and the seebeck coefficient decreases as the temperature increases when TT *** thermal conductivity is lower,and insensitive to the sample preparation conditions.

关键词： polyaniline electrical conductivity Seebeck coefficient thermal conductivity thermoelectric figure of merit

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Mold Filling Analysis in Vacuum Infusion Molding Process Based on a High-Permeable Medium

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Journal of materials Science & technology 2003年第5期19卷 467-471页

作者： Yingdan ZHU, Hua TAN and Jihui WANGstate key laboratory of advanced technology for materials synthesis and processing, Wuhan University of technology, Wuhan 430070, China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The objective of this paper is to understand the flow mechanism through visualization experiments and discuss theinfluence of process parameters on mold filling process. A 2D leakage flow model is developed to simulat... 详细信息

关键词： Vacuum infusion molding process (VIMP) High-permeable medium Mold filling Simulation

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Microstructure and Thermal Properties of (1-x) As_2S_3-xCdCl_2 Glassy System

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Journal of Wuhan University of technology(materials Science) 2003年第3期18卷 43-45页

作者：陶海征 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology

The homogeneous glass samples of the (1-x)As 2S 3 xCdCl 2 where x=0 and 0.05 were prepared by the conventional melt quenched *** addition of 5mol% CdCl 2 enhanced the glass transition temperature of pure As 2S 3 glass sample by about 30℃.Based on the experimental data,the microstructure is considered to be that the discrete molecule species of AsCl 3 and nanocrystal CdS is homogeneously dispersed in the disordered polymer network formed by AsS 3 pyramids interconnected by sulfur bridges.

关键词： chalcohalide microstructure thermal property

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Preparation and characterization of highly photoactive nanocrystalline TiO_(2)powders by solvent evaporation-induced crystallization method

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Science China Chemistry 2003年第6期46卷 549-557页

作者：余家国余济美程蓓赵修建 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070 China Department of Chemistry The Chinese University of Hong KongHong Kong China

Highly photoactive bi-phase nanocrystalline TiO2 photocatalyst was prepared by a solvent evaporation-induced crystallization (SEIC) method, and calcined at different temperatures. The obtained TiO2 photocatalyst was characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface areas. The photocatalytic activity was evaluated by the photocatalytic oxidation of acetone in air. The results show that solvent evaporation can promote the crystallization and phase transformation of TiO2 at 100°C. When calcination temperatures are below 600°C, the prepared TiO2 powders show bimodal pore size distributions in the mesoporous region. At 700°C, the pore size distributions exhibit monomodal distribution of the inter-aggregated pores due to the collapse of the intra-aggregated pores. At 100°C, the obtained TiO2 photocatalyst by this method shows good photocatalytic activity, and at 400°C, its photocatalytic activity exceeds that of Degussa P25. This may be attributed to the fact that the prepared TiO2 photocatalyst has higher specific surface areas, smaller crystallite size and bimodal pore size distribution.

关键词： nanocrystalline, TiO2, photocatalyst, preparation, solvent evaporation-induced crystallization method.

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