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5th Annual Meeting on Testing and Evaluation of Inorganic materials, TEIM 2014

作者： Song, Jieguang Hua, Lin Shen, Qiang Wang, Fang Zhang, Lianmeng Hubei Key Lab of Advanced Technology of Automotive Components School of Automotive Engineering Wuhan University of Technology Wuhan430070 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Materials Engineering Jiujiang University Jiujiang Jiangxi332005 China

ISBN: (纸本)9783038353331

The study of dye-sensitized solar cells (DSCs) based on nano-crystalline films of high band gap semiconductors is a progressive field of research that is being carried out by scientists in a wide range of laboratories. To improve the conversion efficiency of the DSCs, the SnO2 nanorots photocurrent is prepared via the hydrothermal method, and characterized by XRD, FESEM, BET and Absorption spectrum. Though analysis the results, the conclusion is shown the pure SnO2 is preparation, the SnO2 nano-crystalline both shows the single phase that SnO2 from the sule solution to kalin solution. The prepared SnO2 nano-crystalline under pH=3 shows the particle-shape crystalline, the surface area of SnO2 nano-crystalline is 86.3412m2/g. The prepared SnO2 nano-crystalline under pH=7 shows the short rod-shape crystalline, the surface area of SnO2 nano-crystalline is 58.3408m2/g. The absorbance of SnO2 nano-crystalline shows the strong absorption in the ultraviolet ray range, the absorbance of synthesized SnO2 nano-crystalline under pH=11 shows the highest value. © (2015) Trans Tech Publications, Switzerland.

关键词： Dye-sensitized solar cells

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Electrochemical Nanowire Devices for Energy Storage

Electrochemical Nanowire Devices for Energy Storage

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主题：引领工业革命新浪潮——2014第四届国际纳米科技大会

作者： Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key Laboratory Wuhan University of Technology

To understand intrinsic reason of capacity fading of nanowire elctrode, we designed the single nanowire electrochemical devices for in situ probing the direct relationship between electrical transport, structure, and electrochemical properties of the single nanowire electrode. Results show that conductivity of the nanowire electrode decreased during the electrochemical reaction, which limits the cycle life. Based on this conclusion, a series of hierarchical structures nanowires have been obtained, including hierarchical MnMoO4/CoMoO4 heterostructured nanowires and hierarchical mesoporous La0.5Sr0.5CoO2.91 nanowires which show enhanced performance in Li-air batteries and supercapacitors.1 In our present work, a series of novel nanowire architectures have been designed and synthesized, including kinked hierarchical nanowires, hierarchical heterostructured nanowires and hierarchical scrolled nanowires which show great electrochemical and biological probe performances.2-4 It is expected that our research may extend effective methods in directions that will solve the challenge of property degradation in energy storage and open new applications.5

关键词： Electrochemical Nanowire Devices for Energy Storage

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Bending properties of laser welded web-core steel sandwich plates

Bending properties of laser welded web-core steel sandwich p...

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2014 International Conference on materials Science and Engineering technology, MSET 2014

作者： Jiang, Xiao-Xia Zhu, Liang Qiao, Ji-Sen Wu, Yi-Xiong Li, Zhu-Guo Chen, Jian-Hong State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou 730050 China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong University Shanghai 201100 China

ISBN: (纸本)9783038351023

This paper presents a detailed discussion of the bending properties of laser welded web-core steel sandwich plates and the influence of weld width on stiffness and strength. The over-hanging three point bending test was conducted on the laser welded web-core steel sandwich plates with various welds width by self-designed device, together with the finite element simulations. A good agreement is obtained between the 2D FE analyses and experiment results. The stiffness and strength of the sandwich plates increased with the increasing of weld width, especially for the weld width lower than 60% thickness of the core plate. It is necessary to consider the weld width in the design and evaluation of the stiffness and strength of the laser welded web-core sandwich plate. Base on the results, the FEM is the priority to analysis bending properties of laser welded web-core steel sandwich plates. © (2014) Trans Tech Publications, Switzerland.

关键词： Stiffness

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Design and Production of Filament-Wound Composite Pressure Vessels

Design and Production of Filament-Wound Composite Pressure V...

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第十一届中日复合材料学术会议（CJJCC-11）

作者： Lei Zu Jihui Wang Shuxin Li State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

One of the most important issues for the design of filament-wound pressure vessels reflects on the determination of the most efficient meridian profiles and related fiber architectures. To better understand the design and production of filament-wound pressure vessels, in this paper we present an overview and comprehensive treatment for a variety of composite pressure vessels produced using filament winding. A generalized optimality criterion that is adapted to various optimal design problems for pressure vessels is elaborated. A new possibility to improve the vessel performance can be offered by the application of adapted cross-sectional shapes instead of the conventional shapes. The isotensoid design, which leads to equal fiber tension throughout the whole vessel, is conducted to determine the netting-based optimal cross-sectional shapes. In addition, a simplified method for designing isotensoid pressure vessels with unequal polar opening is also outlined, with the aid of non-geodesic trajectories. The optimal design, based on orthotropic plate theory, is divided into two basic approaches: numerical and semi-analytical methods. A numerical optimization method is specially designed for determining the optimal meridian profiles of bellow-shaped pressure vessels. The semi-analytical design methods are presented for the determination of the optimal meridian profiles for continuum-based domes and toroids, respectively. The optimal cross sectional shapes lead to significantly improved structural performance of filament-wound products.

关键词： Composite pressure vessels Filament winding Fiber architecture Geodesic Non-geodesic

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Probing Enhanced Light Absorption of Titania Inverse Opal Films by Photonic Effect for Dye Degradation

Probing Enhanced Light Absorption of Titania Inverse Opal Fi...

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2nd International Conference on Clean Energy Science(第二届清洁能源科学国际会议)

作者： Yu Li Min Wu Bao-Lian Su Laboratory of Inorganic Materials Chemistry University of NamurB-5500 NamurBelgium Laboratory of Living Materials at the State Key laboratory of Advanced technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanHubeiChina Laboratory of Living Materials at the State Key laboratory of Advanced technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhanHubeiChina

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POLYELECTROLYTE BRUSH AS AN EFFECTIVE PROTON CONDUCTOR

POLYELECTROLYTE BRUSH AS AN EFFECTIVE PROTON CONDUCTOR

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10th IUPAC International Conference on Novel materials and their synthesis NMS-X(IUPAC第十届新材料及其合成国际会议)

作者： X.ZHENG J.FENG Y.Q.HUANG H.N.ZHANG State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070P.R.China

Proton conducting materials having reasonable proton conductivity at low humidification conditions are critical for decrease in system complexity and improvement of power density for polymer electrolyte membrane fuel cells. Thus, construction of new materials to improve the efficiency of proton transportation is one of the very important research areas. Herein, we described a new type of proton conductors based on polyelectrolyte brushes which were synthesized through in situ free radical polymerization either from metal oxide nanotubes. The grafting density and grafted chain length can be precisely controlled by controlling the polymerization parameters. The large density of proton conducting moieties and well-distribution of ionic groups makes the free volume inside the materials relatively small and reduces the proton transporting distance. Accordingly, proton conductivity is rather less humidity-dependant. However, both grafting distance and molecular weight of surface-attached polymer electrolyte chains exhibit significant influence on proton conductivity of the formed polymer brushes. With the decrease in average grafting distance of surface-attached polymer chains, the proton conductivity of the synthesized polymer brushes initially increases and then decreases after reaching a maximum value. Non-monotonic behavior of proton conductivity with the increase in molecular weight is also observed. Under optimized conditions, the proton conductivity values of the formed polymer electrolyte brush reach 0.095 Scm~(-1) under 100% relative humidity and 0.01 Scm~(-1) under anhydrous conditions at 140 ℃. Nevertheless, this kind of channelless material has the potential to low-humidity polymer electrolyte membrane applications. This work was financially supported by the National Natural Science Foundation of China (No. 51372192) and Open Foundation from state key laboratory of advanced technology for materials synthesis and processing of WHUT (2014-KF-14).

关键词： polymer brush ion conduction free radical polymerization grafting from

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Graphene-based composite photocatalyst for solar fuel production

Graphene-based composite photocatalyst for solar fuel produc...

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中国化学会第29届学术年会

作者： Jiaguo Yu State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

The production of solar fuels by solar energy conversion is considered to be one of major strategies for solving the global energy and environmental problems in the future. Photocatalytic water splitting for H2 production and CO2 reduction for methane formation have become important and promising methods for clean, economical, and renewal production of solar fuels by using solar light since Fujishima and Honda first reported the photoelectrochemical water splitting on a TiO2 electrode in 1972. Among various semiconductors, titania(TiO2) has attracted special attention because of its strong oxidizing and reduction power, cost effectiveness, lack of toxicity, and high photochemical corrosive resistance. Usually, the photocatalytic H2-production activity on TiO2 is significantly dependent on the type and amount of co-catalyst because bare TiO2 has poor photocatalytic H2-Production activity. It is well-known that the loading of Pt as a co-catalyst on TiO2 significantly enhances H2-production activity for photocatalytic water splitting in the presence of sacrificial reagents. However, Pt is a rare and expensive noble metal. Therefore, alternative co-catalysts based on non-precious metals and earth-abundant materials have been actively pursued. Graphene-based nanocpmposite photocatalysts have recently caused tremendous interest as a viable alternate to increase photocatalytic H2-production and CO2-reduction performance in converting solar energy into chemical energy. The use of graphene as cocatalyst and support to enhance the H2-production activity of photocatalysts has been confirmed due to its unique two-dimensional conjugated structure and electronic properties. In this talk, I will present our recent work on the design and fabrication of graphene-based nanocomposite photocatalytic materials for H2 production and CO2 reduction. The rational designs for high-performance photocatalytic materials using graphene-based materials are described. Our work also demonstrates gr

关键词： Graphene-based composite photocatalyst for solar fuel production

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Adherence and interaction of cationic quantum dots on bacterial surfaces

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Journal of colloid and interface science 2015年 450卷 388-395页

作者： Cheng Yang Hao Xie Qi-Chang Li En-Jie Sun Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. Electronic address: h.xie@***. School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. Laboratory of Inorganic Materials Chemistry University of Namur 61 rue de Bruxelles Namur B-5000 Belgium. Electronic address: bao-lian.su@fundp.ac.be.

Understanding molecular mechanisms of interactions between nanoparticles and bacteria is important and essential to develop nanotechnology for medical and environmental applications. Quantum dots (QDs) are specific nanoparticles with unique optical properties and high photochemical stability. In the present study, direct interactions were observed between cationic QDs and bacteria. Distinct fluorescence quenching patterns were developed when cationic QDs interacted with Gram negative and Gram positive bacteria. The aggregation of QDs on bacterial surface as well as fluorescence quenching depends upon the chemical composition and structure of the bacterial cell envelopes. The presence of lipopolysaccharide is unique to Gram-negative bacterial surface and provides negatively charge areas for absorbing cationic QDs. The effects of lipopolysaccharide were proved on fluorescence quenching of cationic QDs. In contrast to Gram-negative bacteria, the presence of teichoic acids is unique to Gram-positive bacterial cell wall and provides negatively charged sites for cationic QDs along the chain of teichoic-acid molecules, which may protect QDs from aggregation and fluorescence quenching. This study may not only provide insight into behaviors of QDs on bacterial cell surfaces but also open a new avenue for designing and applying QDs as biosensors in microbiology, medicine, and environmental science.

关键词： Bacterial cell wall Bacterial surface Cell membrane Fluorescence quenching Gram-negative bacteria Gram-positive bacteria Lipopolysaccharides (LPS) Nanoparticles Quantum dots (QDs) Teichoic-acids

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Fluorescence and Judd-Ofelt Analysis of Er3+Doped CaF2 Transparent Ceramic

Fluorescence and Judd-Ofelt Analysis of Er3+Doped CaF2 Trans...

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The 2012 International Conference on advanced Material and Manufacturing Science(ICAMMS 2012)

作者： Ruzhen Xing Bingchu Mei Jinghong Song Xiaonv Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Center of Materials Research and Analysis Wuhan University of Technology

In this paper,we evaluated the spectra parameters of *** absorption spectra of Er:CaF2 transparent ceramic was measured at room temperature（RT）.Based on the Judd-Ofelt theory,the intensity parameters were Ω= 5.02×10 cm,Ω = 3.40×10 cm and Ω = 0.38×10cm,and then the values of the radiative transition probabilities,radiative lifetimes and integrated emission cross-sections of excited states were *** width at half maximum（FWHM） of the fluorescence spectra for I→I transition was investigated,being 17 *** decay time was found to be 24.3ms,which is longer than the theoretically calculated value indicating a radiation trapping effect in this work.

关键词： CaF2 transparent ceramic Er3+ Spectroscopic properties Judd-Ofelt theory laser material

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The ring's axial deformation control method of vertical hot ring rolling process

The ring's axial deformation control method of vertical hot ...

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作者： Hu, Ke Wang, Xiao Kai Luo, Jian Lan Wu, Xi Jun School of Automotive Engineering Hubei Key Laboratory of Advanced Technology of Automotive Parts Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783038351214

Axial deformation of the ring during the traditional vertical hot ring rolling (VHRR) process has a considerable effect on the ring products' quality. In this paper, the ring's axial deformation of VHRR process of three different rolling modes, that is, open-die mode, close-die mode and open-die mode with conical rolls like the radial-axial ring rolling (RARR) process is analyzed. Three groups of 3D coupled thermo-mechanical FE models of VHRR process are established in software ABAQUS, and the axial deformation and the width spread of the rings are studied in detail. Finally, a special conical roll device was designed and equipped on the traditional VHRR mill, and series of VHRR experiments are conducted, the results of both simulation and VHRR process show that the formed rings utilizing open-die rolling with a special pair of conical rolls has lower axial deformation, smoother end surface and higher precision than the formed rings utilizing open-die rolling and close-die rolling. The research results can supply an effective approach to axial deformation control of traditional VHRR process. © (2014) Trans Tech Publications, Switzerland.

关键词： Dies

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