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12th IUMRS International Conference on advanced materials, IUMRS-ICAM 2013

作者： Huang, Ben Zhai, Peng Cheng Liu, Li Sheng Department of Engineering Structure and Mechanics Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology of Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ISBN: (纸本)9783038350873

The shear property of the thermoelectric material Bi2Te3 is inextricably linked with its layer structure. By the molecular dynamics method, the mechanism of shearing deformation was studied in this paper. In the simulation, cubic single-crystal simulation cells with different layer directions inside were adopted, ensuring that the c axis of crystal lattice can be along, across and 45° deviated from the shear stress. Compared with all the calculation models, the results show that when the shear stress increases, slip occurs along the Te1-Te1 adjacent layers which are connected by the weak van der Waals bonding, and ultimately leads to structural fracture. Furthermore, size effect and loading modes can also impact the behavior of shearing deformation, however, in very different ways. Future efforts should be focused on the influence of the creation and motion of defects during the deformation as well as temperature effect and strain rate effect. © (2014) Trans Tech Publications, Switzerland.

关键词： Molecular dynamics

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Molecular dynamics simulation on mechanical properties of crystalline CoSb3 with nanopores

Molecular dynamics simulation on mechanical properties of cr...

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作者： Li, W. Zhai, P. Li, G. Yang, X. Liu, L. Department of Engineering Structure and Mechanics Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology of Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Mechanical stability is of vital significance in commercial application of thermoelectric materials. The essential mechanical behaviours of a nanoporous skutterudite thermoelectric material have been studied by the molecular dynamics method. The research results reveal that the nanoporous skutterudite is a typical non-linear elastic brittle material, and that the existence of nanopores can remarkably reduce the mechanical properties of the skutterudite. Further research results reveal that the elastic modulus of the nanoporous skutterudite decreases with the growing porosity, and the relationship between the elastic modulus and the porosity can be summarised by an inversely proportional scaling law. The ultimate stress reduces gradually with the decreasing inner nanopore spacing. The fracture strain first decreases and then levels off, which can be attributed to the interplay between the increased porosity and the reduced inner nanopore spacing. © W. S. Maney & Son Ltd. 2014.

关键词： Molecular dynamics

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Positron annihilation study of Fe-ion irradiated reactor pressure vessel model alloys

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Journal of Physics: Conference Series 2016年第1期674卷

作者： L Chen Z C Li H Schut N Sekimura State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Nuclear Engineering and Management The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China To whom any correspondence should be addressed. Department of Radiation Science and Technology Delft University of Technology Mekelweg 15 2629 JB Delft the Netherlands

The degradation of reactor pressure vessel steels under irradiation, which results from the hardening and embrittlement caused by a high number density of nanometer scale damage, is of increasingly crucial concern for safe nuclear power plant operation and possible reactor lifetime prolongation. In this paper, the radiation damage in model alloys with increasing chemical complexity (Fe, Fe-Cu, Fe-Cu-Si, Fe-Cu-Ni and Fe-Cu-Ni-Mn) has been studied by Positron Annihilation Doppler Broadening spectroscopy after 1.5 MeV Fe-ion implantation at room temperature or high temperature (290 oC). It is found that the room temperature irradiation generally leads to the formation of vacancy-type defects in the Fe matrix. The high temperature irradiation exhibits an additional annealing effect for the radiation damage. Besides the Cu-rich clusters observed by the positron probe, the results show formation of vacancy-Mn complexes for implantation at low temperatures.

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Nanowire material and its application in electrochemical energy storage field

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Gongneng Cailiao/Journal of Functional materials 2014年第12期45卷 12010-12018页

作者： Ren, Wen-Hao Zhao, Kang-Ning Zheng, Zhi-Ping Mai, Li-Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key Laboratory Wuhan University of Technology Wuhan 430070 China

It was still a worldwide challenge to improve capacity, cycling stability and rate performance in consideration of the intrinsic properties and structure of material. Compared with other nanostructure, nanowire have demonstrated better electrochemical performance in regard of electrochemical energy storage devices such as Li-ion battery, Li-air battery and supercapacitor, since it has unique anisotropy, large specific surface area, facile strain relaxation, fast axial electron transport and radial ion diffusion. Moreover, nanowire have shown the advantages in facile assembly and in-situ characterization of electrochemical energy storage devices. Based on the latest progress in nanowire materials, we mainly summarize the design, assembly and characterization of single nanowire electrochemical energy storage device and the optimization strategy of nanowire materials. In this article, we review the strategy in improving the electrochemical performance of one-dimensional structure. This article lays a foundation for the development and applications of nanowire materials in electrochemical energy storage field.

关键词： Nanowires

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Preparation of ATO thin films from SPS-derived large size ATO ceramic targets by PVD methods

Preparation of ATO thin films from SPS-derived large size AT...

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8th International Conference on processing and Manufacturing of advanced materials, THERMEC 2013

作者： Chen, Fei Wu, Jun Yan Shen, Qiang Schoenung, Julie M. Zhang, Lian Meng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology Wuhan 430070 China Department of Chemical Engineering and Materials Science University of California Davis CA 95616 United States

ISBN: (纸本)9783038350736

Good crystalline of ATO thin films is necessary to improve the electrical and optical properties. In this paper, ATO thin films were fabricated using PLD method at high temperature of 550 °C, and the effect of laser energy density on the microstructure, electrical property and optical property of the ATO films is discussed. The results suggest that ATO films show good crystalline when deposited at high temperature of 550 °C. Both the electrical and optical properties have been enhanced with the increasing of laser energy density. When the laser energy density is 5.4 J/cm2, the lowest resistivity of ATO thin film is obtained with the value of 6.52×10-4 Ω·cm and the average optical transmittances is 82.0%. © (2014) Trans Tech Publications, Switzerland.

关键词： Pulsed laser deposition

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Mechanical alloying and spark plasma sintering of CoCrFeNiMnAl high-entropy alloy

Mechanical alloying and spark plasma sintering of CoCrFeNiMn...

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作者： Wang, Chao Ji, Wei Fu, Zhengyi Department of Architecture and Material Engineering Hubei University of Education Wuhan430205 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

An equiatomic CoCrFeNiMnAl high-entropy alloy was synthesized by mechanical alloying, and alloying behaviors, microstructure and annealing behaviors were investigated. It was found that a solid solution with refined microstructure of 20 nm in grain size could be obtained after 30 h milling. As-milled powder transformed into a face-centered cubic phase above 500 °C. The as-milled powder was subsequently consolidated by spark plasma sintering at 800 °C, BCC phase and FCC phase coexisted in the consolidated HEA, which had excellent properties in Vickers hardness of 662 HV and compressive strength of 2142 MPa. © 2014 The Society of Powder technology Japan. Published by Elsevier B.V. and The Society of Powder technology Japan. All rights reserved.

关键词： Mechanical alloying

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Dynamic biointerfaces: from recognition to function

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Small (Weinheim an der Bergstrasse, Germany) 2015年第9-10期11卷 1097-112页

作者： Baisong Chang Mingxi Zhang Guangyan Qing Taolei Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China.

The transformation of recognition signals into regulating macroscopic behaviors of biological entities (e.g., biomolecules and cells) is an extraordinarily challenging task in engineering interfacial properties of artificial materials. Recently, there has been extensive research for dynamic biointerfaces driven by biomimetic techniques. Weak interactions and chirality are two crucial routes that nature uses to achieve its functions, including protein folding, the DNA double helix, phospholipid membranes, photosystems, and shell and tooth growths. Learning from nature inspires us to design dynamic biointerfaces, which usually take advantage of highly selective weak interactions (e.g., synergetic chiral H-bonding interactions) to tailor their molecular assemblies on external stimuli. Biomolecules can induce the conformational transitions of dynamic biointerfaces, then drive a switching of surface characteristics (topographic structure, wettability, etc.), and eventually achieve macroscopic functions. The emerging progresses of dynamic biointerfaces are reviewed and its role from molecular recognitions to biological functions highlighted. Finally, a discussion is presented of the integration of dynamic biointerfaces with the basic biochemical processes, possibly solving the big challenges in life science.

关键词： H-bonding interactions biointerfaces biological functions chirality dynamic biointerfaces molecular recognition

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Nanowire Thin Film Devices for Electrochemical Energy Storage

Nanowire Thin Film Devices for Electrochemical Energy Storag...

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第十四届全国固体薄膜学术会议

作者： Xiujuan Wei Mengyu Yan Lin Xu Yunlong Zhao Chunhua Han Liang He Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing.WUT-Harvard Joint State Key Laboratory of Advanced Technology for Materials Synthesis and Processing.WUT-Harvard Joint

Nanowires have attracted increasing interests because one-dimensional (1-D) nanomaterials can offer a range of unique advantages in many energy related fields.[1-6] For previous Iithium battery applications, bulk materials made of nanowires were usually used as the *** the electrochemical properties could be improved, the fast capacity fading is still one of the key issues and the intrinsic reasons are not clear until *** situ probing has been increasingly employed in nanotechnology.[7-8] To understand intrinsic reason of capacity fading,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, which may push the fundamental limits of the nanowire materials for energy storage applications.[9] Our results show that conductivity of the nanowire electrode decreased during theelectrochemical reaction, which limits the cycle life of the devices.

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Effects of PRGD/PDLLA/β-TCP conduit on peripheral nerve regeneration and neuroma formation

Effects of PRGD/PDLLA/β-TCP conduit on peripheral nerve reg...

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第四届国际神经再生高峰论坛(INRS2014)暨第九届亚太神经再生论坛(APSNR2014)暨第六届脊髓损伤治疗与临床试验国际交流会(ISCITT2014)

作者： Yixia Yin Jiling Yi Tong Qiu Qiongjiao Yan Honglian Dai Shipu Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Peripheral nerve injury is the common cause that leads to disability. Large nerve defect and traumatic neuroma are two main bottleneck problems during repairing after peripheral nerve injury. So far, there is very limited research on neuroma inhibition with nerve conduit. Our group previously found that a PDLLA/PRGD/β-TCP composite conduit had beneficial effect on nerve regeneration, and no obvious neuroma formation was found in 00 experimental animals（Huang et al., 2013;Qiu et al., 2014）. Neuroma formation is based on excessively sedimentary collagen proliferation. We hypothesized that PDLLA/PRGD/β-TCP composite had the effect on the neural scar formation-related cytokines such as NGF, IFN-γ, etc., gene expression and protein level of collagen. In in vitro test, PRGD/PDLLA/β-TCP membranes showed better cytocompatibility with Schwann cells. In vivo tests demonstrated that PRGD/PDLLA/β-TCP conduits effectively promoted axonal regeneration of 10 mm rat sciatic nerve defect, which was close to the success of autograft. After an observation period of 1, 3, 6 month, PRGD/PDLLA/β-TCP conduit-implanted showed no neuroma and significantly improving on the neurophysiological and neuropathological levels compared with the PDLLA conduit as control group. The microenvironment of the inner conduit, containing an appropriate concentration of calcium ion, growth factors and immunologic factors（Figure 1）, played an important role in the inhibition of neuroma formation. The effect of the conduit on neural scar distributionand scar ratio, nerve function recovery, and structure of regenerated myelin sheath has been studied. The neural scar distribution is perineural scarring and the scar ratio is lower than the control of PDLLA group（Figure 2）. The study revealed that PRGD/PDLLA/β-TCP conduits promoted nerve regeneration and inhibited neuroma formation. It will provide experimental basis for future studies in nerve conduits for inhibition of neuroma formation and promoting long-distan

关键词： anerve repairing composite neural scar cytokine inhibition neuroma formation

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Design and synthesis of Artificial Photosynthesis Bioreactor for Carbon Dioxide Conversion

Design and Synthesis of Artificial Photosynthesis Bioreactor...

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2014第七届国际工业生物技术大会

作者： Xiao-Yu Yang Nan Jiang Wei Geng Guo-Liang Ting Shao-Yin Liu Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

It is of great importance to utilize solar energy and convert CO in the fields of energy,environment and sustainable *** photosynthetic bioreactor has been paid more attention due to its "green and natural" photosynthesis process,which can directly eliminate CO and convert CO to biomass by using ***,photosynthetic bioentities used in artificial photosynthesis bioreactor are often unstable,especially in adverse *** technology is an essential approach to improve the stability and reusability of photosynthetic bioentities for further applications in biosensors,biofuel cells,such as layer-by-layer and sol-gel ***,the stability and reusability of photosynthesis bioreactor have proven *** approach is to design a biocompatible biohybrid shell for the encapsulation and stabilization of single photosynthesis cell as the core of artificial photosynthesis *** material as the shell is advantageous for protecting photosynthetic bioentities from chemical and physical affection and beneficial for mass diffusion as well as endowing photosynthetic bioentities with exogenous properties such as anti-UV,heat-tolerance,acid-alkaline ***,this method can also be extended to diverse living organisms,which is essential for the potential applications in the development of energy exploitation,water treatment,and environment *** instance,in the technology for removal of organic sulfur from fossil fuels,the high stability of encapsulated desulphurizing bacteria could have greater desulfurizing activity and operational stability and may be potential for large-scale industrial ***,the strategy will also beneficial for the stability of artificial hydrogen bio-production *** believe that it will open up a new door to use a simple and green approach to fabricate stable artificial photosynthesis bioreactors for CO conversion,energy and environment m

关键词： Design and synthesis of Artificial Photosynthesis Bioreactor for Carbon Dioxide Conversion

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