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2014功能材料国际会议

作者： Mengyu Yan Xu Xu Lin Xu Yunlong Zhao Chunhua Han Liang He Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key Laboratory Wuhan University of Technology Department of Chemistry and Biology Harvard University

Nanowires have attracted increasing interests because one-dimensional(1-D)nanomaterials can offer a range of unique advantages in many energy related *** previous lithium battery applications,bulk materials made of na...

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Further Understanding of Conjugated Polymers for High Efficiency Solar Cells: A Case Study of PBnDT-FTAZ

Further Understanding of Conjugated Polymers for High Effici...

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中国化学会第29届学术年会

作者： Wei You State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Chemistry University of North Carolina at Chapel Hill

PBnDT-FTAZ, a "weak donor-strong acceptor" polymer that combines benzodithiophene（BnDT） and fluorinated benzotriazole（FTAZ）, has received significant amount of attention because it is a peculiar material with many outstanding features that need to be further explained. For example, with a medium band gap of 2.0 V, PBnDT-FTAZ can still generate over 7% power conversion efficiency with a noticeably high fill factor over 70% in its BHJ cells with a relatively thick film（200 – 300 nm）. In this talk, I will discuss our ongoing efforts to further understand this interesting polymer. First, we discovered that all these interesting properties shown by PBnDT-FTAZ can only be obtained with polymers of a quite narrow range of molecular weight. Second, molecular engineering of PBnDT-FTAZ by substituting alkylthiol and selenophene in PBnDT-FTAZ give mixed results: Voc seems fixed around 0.8 V;however, Jsc can be further increased.

关键词： Conjugated Polymer Solar Cell

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Impedance analysis of Nb2O5 doped BaTiO3-Na0.5Bi0.5TiO3 ceramics

Impedance analysis of Nb2O5 doped BaTiO3-Na0.5Bi0.5TiO3 cera...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Yue Sun Hanxing Liu Hua Hao Shujun Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Material Research Institute The Pennsylvania State University USA

BaTiO 3 -based MLCC materials were limited for high temperature applications (temperature range up to 200°C), due to their low Curie temperatures. The addition of Na 0.5 Bi 0.5 TiO 3 (NBT) component in BaTiO 3 (BT) based ceramics was found to increase the Curie temperature, without sacrificing the dielectric constant. The Curie temperature was reported to increase from 125°C to 156°C with addition up to 10mol%, making it possible to satisfy the X8R or X9R criterions. In addition, the small amount of Nb 2 O 5 dopant in the system leads to a diffused dielectric maxima and improved temperature stability. The NBT-BT with 2wt% Nb 2 O 5 addition was found to exhibit a core-shell structure, while maintaining the dielectric constant at about 2500. To analyze the electrical microstructure variation, the obtained impedance data was fitted by a 4RC equivalent circuit, corresponding to the core, shell, grain boundary, and ceramic/electrode interface regions. All the electrical properties, including the capacitance, activation energy, and conductivity could be well explained by using this equivalent circuit.

关键词： Niobium Ceramics Grain boundaries Dielectrics Impedance Temperature Conductivity

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Effects of van der Waals interactions and quasiparticle corrections on the electronic and transport properties of Bi2Te3

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Physical Review B 2014年第8期90卷 085118-085118页

作者： L. Cheng H. J. Liu J. Zhang J. Wei J. H. Liang J. Shi X. F. Tang Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education and School of Physics and Technology Wuhan University Wuhan 430072 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

We present a theoretical study of the structural, electronic, and transport properties of bulk Bi2Te3 within density functional theory taking into account the van der Waals interactions (vdW) and the quasiparticle self-energy corrections. It is found that the optB86b-vdW functional can well reproduce the experimental lattice constants and interlayer distances for Bi2Te3. Based on the fully optimized structure, the band structure of Bi2Te3 is obtained from first-principles calculations with the GW approximation and the Wannier function interpolation method. The global band extrema are found to be off the high-symmetry lines, and the real energy band calculated is in good agreement with that measured experimentally. In combination with the Boltzmann theory, the GW calculations also give accurate prediction of the transport properties, and the calculated thermoelectric coefficients of Bi2Te3 almost coincide with the experimental data.

关键词： VAN der Waals forces QUASIPARTICLES (Physics) ELECTRON transport BOLTZMANN'S constant WANNIER-stark effect THERMOELECTRIC effects

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Preparation of PMMA/graphene oxide microcellular foams using supercritical carbon dioxide

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IOP Conference Series: Materials Science and Engineering 2015年第1期87卷

作者： Meijuan Li Ping Cheng Ruizhi Zhang Guoqiang Luo Qiang Shen Lianmeng Zhang Department of Chemistry School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Wuhan Hubei 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 China

Microcellular foams have a widely applications in many industries due to their superior properties. In this paper, the polymethymethacrylate (PMMA)/graphene oxide (GO) microcellular foams were prepared by supercritical carbon dioxide as a friendly foaming agent. The effect of graphene oxide amount on cellular structure and mechanical strength of foams had been investigated. Microstructure characterization bases on scanning electron microscopy (SEM). The cell size and cell density were calculated via image analysis. It was found that the average foam cell size was decreased from 20.1 μm to 2.2 μm and the cell density was increased from 2.8×108 to 3.3×1010 when 1.5wt.% GO sheets were added into PMMA matrix. In addition, the compression strength of polymeric foams was increased from 13 MPa to 39 MPa.

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Preparation and properties of Zn4Sb3Inδ thermoelectric compounds

Preparation and properties of Zn4Sb3Inδ thermoelectric comp...

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2014国际纳米技术和新能源材料研讨会——暨世界著名科学家来鄂讲学计划武汉论坛

作者： Dingguo Tang Wenyu Zhao Jian Yu Ping Wei Hongyu Zhou Wanting Zhu Qingjie Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Catalysis and Materials Science of the State Ethnic Affair Commission & Ministry of Education South-Central University for Nationalities

Thermoelectric materials are capable of interconverting heat and electricity directly. The high thermoelectric performance of β-Zn4 Sb3 has drawn much attention for its application in the intermediate temperature ran... 详细信息

关键词： thermoelectric compounds Preparation and properties of Zn4Sb3In

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Efficient catalytic removal of formaldehyde at room temperature using AlOOH nanoflakes with deposited Pt

Efficient catalytic removal of formaldehyde at room temperat...

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第十七届全国催化学术会议

作者： Zhihua Xua Zhaoxiong Yana Zhengfang Tian Shuibing Yang Hubei Key Laboratory for Processing and Application of Catalytic Materials Huanggang Normal UniversityHuanggang 438000 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070 Hubei Key Laboratory for Processing and Application of Catalytic MaterialsHuanggang Normal UniversityHuanggang 438000

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A polymer-network gel coating method for BaTiO3-based dielectric ceramics with a multilayer core-shell structure

A polymer-network gel coating method for BaTiO3-based dielec...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Ting Wang Mengying Liu Hua Hao Zhonghua Ya Minghe Cao Hanxing Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan People's Republic of China Wuhan University of Technology Wuhan Hubei CN

A modified polymer-network gel route has been developed to prepare a multilayer core-shell structure of BaTiO 3 -based dielectric ceramics, which greatly improved the efficiency of gelation process. The core particles are BaTiO 3 , while 0.7 BaTiO 3 -0.3Bi(Zn 1/2 Ti 1/2 )O 3 (0.7 BT-0.3BZT) and Nb oxides were coated in order as the shell material. The influences of core-shell structure and ratios on the dielectric properties were studied. The samples of coated BaTiO 3 were found to possess optimized temperature stability of dielectric behavior in the temperature range of -55 to 200°C (ΔC/C≤ ± 15%), the dielectric constant at room temperature could reach 1190, with a low dielectric loss at about 1.3%.

关键词： Ceramics Temperature Dielectric constant Dielectric losses Capacitance Coatings

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Repair, protection and regeneration of peripheral nerve injury

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Neural Regeneration Research 2015年第11期10卷 1777-1798页

作者： Shan-lin Chen Zeng-gan Chen Hong-lian Dai Jian-xun Ding Jia-song Guo Na Han Bao-guo Jiang Hua-jun Jiang Juan Li Shi-pu Li Wen-jun Li Jing Liu Yang Liu Jun-xiong Ma Jiang Peng Yun-dong Shen Guang-wei Sun Pei-fu Tang Gu-heng Wang Xiang-hai Wang Liang-bi Xiang Ren-guo Xie Jian-guang Xu Bin Yu Li-cheng Zhang Pei-xun Zhang Song-lin Zhou Department of Hand Surgery Beijing Jishuitan Hospital Department of Orthopedic Surgery Zhongshan Hospital Fudan University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Biomedical Materials and Engineering Research Center of Hubei Province Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences Department of Histology and Embryology Southern Medical University Key Laboratory of Tissue Construction and Detection of Guangdong Province Institute of Bone Biology Academy of Orthopedics Peking University People's Hospital Department of Orthopedics First Affiliated Hospital of Dalian Medical University The First Affiliated Hospital of Dalian Medical University Laboratory of Biotechnology Dalian Institute of Chemical PhysicsChinese Academy of Sciences Department of Orthopedics General Hospital of Shenyang Military Area Command of Chinese PLA Rescue Center of Severe Wound and Trauma of Chinese PLA Institute of Orthopedics Chinese PLA General Hospital The Neural Regeneration Co-innovation Center of Jiangsu Province Department of Hand Surgery Huashan Hospital Fudan University Department of Hand and Upper Extremity Surgery Jing’an District Centre Hospital Department of Orthopedics General Hospital of People's Liberation Army Department of Hand Surgery Affiliated Hospital of Nantong University Trauma Center Department of Orthopedic Surgery Shanghai First People’s Hospital Shanghai Jiao Tong University School of Medicine Jiangsu Key Laboratory of Neuroregeneration Co-innovation Center of Neuroregeneration Nantong University

Reading guide 1778Repair of long-segment peripheral nerve defects1779Bionic reconstruction of hand function after adult brachial plexus root avulsion1780Optimized design of regeneration material for the treatment of peripheral nerve injury1781Synergism of electroactive polymeric materials and electrical stimulation promotes peripheral nerve repair1783Schwann cell effect on peripheral nerve repair and regeneration .

关键词： cell protection and regeneration of peripheral nerve injury Repair

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Heterogeneous Acid Catalytic Esterification by Porous Polyoxometalate-tantalum Pentoxide Nanocomposites

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Journal of Wuhan University of technology(Materials Science) 2013年第3期28卷 580-585页

作者：许蕾蕾 GUOYihang MA Huiru 官建国 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Chemistry Northeast Normal University

Polyoxometalates （POMs） are useful catalysts in both redox and acid catalysis reactions since its catalytic features can be controlled at a molecular level. We investigated POM （POM = H3PW12040） on tantalum pentoxide （Ta2O5） via hydrolysis of tantalum pentachloride （TaCl5） in the presence of POM using the sol-gel method for acid catalytic reaction. All obtained amorphous materials have been characterized by inductively coupled plasma atomic emission spectroscopy （ICP-AES）, Fourier transform infrared （FT-IR） spectra, Raman scattering spectroscopy, 31P magic-angle spinning （MAS） NMR, field emission scanning electron microscopy （FESEM）, and nitrogen adsorption/desorption analysis, in order to confirm the structure integrity of the Keggin unit in as-prepared composites and investigate the morphology and surface textural property of the composites. Catalytic activity of the catalysts has been evaluated for esterification of acetic acid with ethanol as a model reaction with different catalytic reaction parameters such as POM loading, reaction time, catalyst dose, molar ratio of the reactants, etc. The conversion of ethanol reached 87.4 % and the turnover frequency （TOF） was 2.9x ***, it is easy to separate and recover POM/Ta205 from the reaction system.

关键词： esterification polyoxometalate tantalum pentoxide sol-gel porous mataterials

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