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International Conference on Machine Tool technology and Mechatronics Engineering, ICMTTME 2014

作者： Huang, Kai Jin Wang, Yu Yue Lin, Xin State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an China State Key Laboratory of Solidification Processing Northwestern Polytechnic University Xi’an China

ISBN: (纸本)9783038352464

To improve the wear properties of AZ91D magnesium alloys, a AlFeCuCoNiCrTi1. 5 high entropy alloy (HEA) coating was fabricated on AZ91D magnesium alloys by laser cladding using mixed powders of Al, Fe, Cu, Co, Ni, Cr, and Ti. The microstructure of the HEA coating was characterized by OM, SEM, and XRD. The wear resistance of the HEA coating was evaluated under dry sliding wear test condition at room temperature. The results show that the HEA coating mainly consists of a simple BCC solid solution phase. The HEA coating exhibits excellent wear resistance. The main wear mechanisms of the HEA coating and the AZ91D substrate were different, the former dominated by oxidative abrasive wear and the latter suffered from both adhesive and abrasive wear. © (2014) Trans Tech Publications, Switzerland.

关键词： Titanium alloys

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Three-dimensional porous graphene sponges assembled with the combination of surfactant and freeze-drying

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Nano Research 2014年第10期7卷 1477-1487页

作者： Rujing Zhang Yachang Cao Peixu Li Xiaobei Zang Pengzhan Sun Kunlin wang Minlin Zhong Jinquan Wei Dehai Wu Feiyu Kang Hongwei Zhu School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Materials Processing Technology of MOE Tsinghua University Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China Advanced Materials Institute Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China

With the combination of surfactant and freeze-drying, we have developed two kinds of graphene spongy structures. On the one hand, using foams of soap bubbles as templates, three-dimensional porous graphene sponges with rich hierarchical pores have been synthesized. Pores of the material contain three levels of length scales, including millimeter, micrometer and nanometer. The structure can be tuned by changing the freezing media, adjusting the stirring rate or adding functional additives. On the other hand, by direct freeze-drying of a graphene oxide/surfactant suspension, a porous framework with directionally aligned pores is prepared. The surfactant gives a better dispersion of graphene oxide sheets, resulting in a high specific surface area. Both of the obtained materials exhibit excellent absorption capacity and good compression performance, providing a broad range of possible applications, such as absorbents, storage media, and carriers.

关键词： graphene sponge hierarchical freezing media porous foams

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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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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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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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Preparation and Properties of Triazine DithiolSilane Composite Self-assembled hydrophobility Films on Stainless steel surfaces

Preparation and Properties of Triazine DithiolSilane Composi...

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2014中国功能材料科技与产业高层论坛

作者： Ming-ming Hu Dong-ming Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Self-assembled method for controllable fabrication of a hydrophobic triazine dithiol-silane composite film on 304 stainless steel(SS)is reported in this *** structure composed of micro/nano-featherlike surface was obtained by acid *** modification with 2-(Dibutylamino)-4,6-dimercapto-1,3,5-triazine(DB)and n-octadecyltrichlorosilane(OTS),the suface became *** applying SEM,FTIR-RAS,and water contact angle analysis,the surface morphology and hydrophobicity of the as-prepared surfaces were studied in *** results indicated that at the optimal condition,the surface showed a good hydrophobicity with a water contact angle as high as 152±3°.Possible growth mechanism of featherlike hierarchical structure was ***,the anticorrosion effect of the hydrophobic surface was studied by potentiodynamic polarization *** showed that the surface covered with hydrophobic composite film was found to be more positive than bare and monolayer,the corrosion current was significantly lower to 1.68nA/cm2,and the corrosion potential shifted positivelyfrom-253 mV to-118 mV(vs SEC).

关键词： Self-assemble Hydrophobic Corrosion 304 Stainless Steel

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synthesis and Characterization of Bismuth Nanowires via Seeded Growth Approach

Synthesis and Characterization of Bismuth Nanowires via Seed...

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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： Xin Mu Wenyu Zhao Danqi He Hongyu Zhou Wanting Zhu Qingjie Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Nanowires have attracted extensive attention in improving the thermoelectric figure of m erit ZT due to quantum confinement effect and enhanced phonon scattering. In this work, a seeded growth approach composed of seed synthesis and seed growth was first proposed to synthesize of bismuth nanowires. Bismuth seeds, as nucleation center of growing bismuth nanowires, were first synthesized by reducing BiCl3 in the ice

关键词： synthesis and Characterization of Bismuth Nanowires via Seeded Growth Approach

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Isolation and Crystallographic Characterization of the Labile Isomer of Y@C82Cocrystallized with Ni(OEP): Unprecedented Dimerization of Pristine Metallofullerenes

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Angewandte Chemie 2016年第32期128卷

作者： Lipiao Bao Changwang Pan Zdenek Slanina Filip Uhlik Takeshi Akasaka Xing Lu State Key Laboratory of Materials Processing and Die & Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 P.R. China Life Science Center of Tsukuba Advanced Research Alliance University of Tsukuba Tsukuba Ibaraki 305-8577 Japan Department of Physical and Macromolecular Chemistry Charles University in Prague 12843 Prague 2 Czech Republic

Although the major isomers of M@C 82 (namely M@ C 2 v (9)‐C 82 , where M is a trivalent rare‐earth metal) have been intensively investigated, the lability of the minor isomers has meant that they have been little studied. Herein, the first isolation and crystallographic characterization of the minor Y@C 82 isomer, unambiguously assigned as Y@ C s (6)‐C 82 by cocrystallization with Ni(octaethylporphyrin), is reported. Unexpectedly, a regioselective dimerization is observed in the crystalline state of Y@ C s (6)‐C 82 . In sharp contrast, no dimerization occurs for the major isomer Y@ C 2 v (9)‐C 82 under the same conditions, indicating a cage‐symmetry‐induced dimerization process. Further experimental and theoretical results disclose that the regioselective dimer formation is a consequence of the localization of high spin density on a special cage‐carbon atom of Y@ C s (6)‐C 82 which is caused by the steady displacement of the Y atom inside the C s (6)‐C 82 cage.

关键词： Dichtefunktionalrechnungen Dimerisierungen Metallofullerene Strukturaufklärung Yttrium

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Microstructure and wear resistance of Cu0.9NiAlCoCrFe high entropy alloy coating on AZ91D magnesium alloys by laser cladding

Microstructure and wear resistance of Cu0.9NiAlCoCrFe high e...

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4th International Conference on materials Science and Information technology, MSIT 2014

作者： Huang, Kai Jin Wang, Yu Yue Lin, Xin State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Solidification Processing Northwestern Polytechnic University Xi'an 710072 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou 730050 China

ISBN: (纸本)9783038351733

To improve the wear properties of AZ91D magnesium alloys, a Cu0.9NiAlCoCrFe high entropy alloy (HEA) coating was fabricated on AZ91D magnesium alloys by laser cladding using prealloyed Cu0.9NiAlCoCrFe powders. The microstructure of the HEA coating was characterized by OM, SEM and XRD. The wear resistance of the HEA coating was evaluated under dry sliding wear test condition at room temperature. The results show that the HEA coating mainly consists of a simple BCC solid solution phase. The HEA coating exhibits excellent wear resistance. The main wear mechanisms of the HEA coating and the AZ91D substrate were different, the former dominated by oxidative abrasive wear and the latter suffered from both adhesive and abrasive wear. © (2014) Trans Tech Publications, Switzerland.

关键词： Microstructure

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Fabrication of flexible α-MnO_2 nanowire membranes with superior mechanical strength

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Chinese Science Bulletin 2014年第13期59卷 1454-1458页

作者： Xingyue Zhao Xiaochong Zhao Jianbao Li Xiangyun Deng Hong Lin State Key Laboratory of New Ceramics & Fine Processing School of Materials Science and Engineering Tsinghua University Science and Technology on Surface Physics and Chemistry Laboratory Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources Hainan University College of Physics and Electronic Information Tianjin Normal University

The Assembly of one-dimensional(1D)nanostructures such as nanowires/nanorods/nanotubes into twodimensional(2D)macrostructured films is attracting considerable research interest because of their unique properties and wide *** this study,flexible membranes were successfully fabricated using a-MnO2nanowires synthesized through a hydrothermal *** effects of thickness and post-annealing temperature on the mechanical properties of the membranes were investigated in ***-indentation measurements showed that the modulus of the as-prepared 11.75 lm-thick membrane reached5.765 GPa,and the modulus increased with the increasing post-annealing ***,the fabricated membranes with superior mechanical strength can have potential applications such as in photocatalysis,filtering,and supporting substrates.

关键词：机械强度二氧化锰纳米线制造膜退火温度机械性能水热法合成

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