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Chinese Materials Congress, CMC 2014

作者： Liu, Bao Lin Liu, Rong Jun Zhang, Chang Rui Cao, Ying Bin Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology ChangshaHunan Province410073 China

ISBN: (纸本)9783038353959

2.5D SiC/SiC composites with and without BN interphase coating were fabricated by VSI process from SiC/C preforms that were produced after 3, 4 and 5. PIP C cycles, respectively. The effect of the BN interphase coating and PIP C cycles on the mechanical properties and microstructure of the composites was investigated. The results indicated that the composites with or without BN interphase coating exhibited catastrophic fracture behavior. Both the excess residual carbon and BN interphase coating played a positive role in protecting the SiC fibers from silication by vapor silicon, which accounted for the less obvious fibers pull-out phenomenon that occurred in the composites. The PIP cycles had an influence on the residual porosity and the content of the newly developed SiC in the composites, and therefore the mechanical properties of the composites were influenced. The composites fabricated from preforms after 4. PIP C cycles and containing BN interphase coating have a flexural strength of 122.5. MPa and a modulus of 86.5. GPa. © (2015) Trans Tech Publications, Switzerland.

关键词： Coatings

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Heat transfer performance of a novel double-layer mini-channel heat sink

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Heat and Mass Transfer 2016年第3期53卷 929-936页

作者： Tang, Biao Zhou, Rui Bai, Pengfei Fu, Ting Lu, Longsheng Zhou, Guofu Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou China The Key Laboratory of Metallurgical Equipment and Control of Education Ministry Wuhan University of Science and Technology Wuhan China Key Laboratory of Surface Functional Structure Manufacturing of Guangdong Higher Education Institutes South China University of Technology Guangzhou China

High pressure drop and significant non-uniformity in temperature distribution along the streamwise direction are still challenges to the design of mini-channel heat sink. High density mini-channel arrays with high liquid-wall contact area are usually pursued in a conventional single-layer design of heat sink, which also inevitably brings high pressure drop. A novel double-layer structured heat sink is proposed in this paper. Four heat sinks with various designs in mini-channel density and flow direction were fabricated and studied experimentally on the heat transfer performance. The single factor of heat load does not show obvious effect on the overall thermal resistance of the heat sinks. On the other hand, slight decrease in thermal resistance was found with the increase in heat load at high flow rates. Moreover, a computational fluid dynamics modeling work was conducted. The results indicate that the parallel cross-flow field regulated by the double-layer structure enhances the heat exchange in both horizontal and vertical directions and consequently gives an uniform temperature distribution and high heat transfer efficiency.

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Fluorescence Switches: Ferrocene-Grafted Photochromic Triads Based on a Sterically Hindered Ethene Bridge: Redox-Switchable Fluorescence and Gated Photochromism (advanced Optical Materials 9/2016)

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advanced Optical Materials 2016年第9期4卷 1313-1313页

作者： Cai, Yunsong Gao, Ya Luo, Qianfu Li, Mengqi Zhang, Junji Tian, He Zhu, Wei-Hong Key Laboratory for Advanced Materials and Institute of Fine Chemicals Shanghai Key Laboratory of Functional Materials Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai200237 China College of Fundamental Studies Shanghai University of Engineering Science Shanghai201620 China

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Human walking-driven wearable all-fiber triboelectric nanogenerator containing electrospun polyvinylidene fluoride piezoelectric nanofibers

Human walking-driven wearable all-fiber triboelectric nanoge...

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中国纺织工程学会化纤专业委员会2016年年会暨中国化纤科技大会

作者： Tao Huang Cheng Wang Hao Yu Hongzhi Wang Qinghong Zhang Meifang Zhu State Key Laboratory for Modification of Chemical Fibers & Polymer Materials College of Materials S Shanghai Key Laboratory of Functional Hybrid Materials College of Materials Science and Engineering Engineering Research Center of Advanced Glasses Manufacturing Technology College of Materials Scien

A simple-to-fabricate, high-performance, wearable all-fiber triboelectric nanogenerator (TENG)-based insole composed of electrospun piezoelectric polyvinylidene fluoride (PVDF) nanofibers sandwiched between a pair of conducting fabric electrodes that effectively harvests energy during human walking is *** surface of the nanofibers is roughened with secondary nanostructure to enhance insole *** maximum output voltage, instantaneous power and output current from the insole reach 210 V, 2.1 mW and 45 μA, *** role of the piezoelectric effect in the electrospun PVDF nanofibers in this TENG-based insole is then systematically *** device is shown to be a reliable power source that can be used to light up 214 serially connected light-emitting diodes *** soft fiber-based electric power generator demonstrated in this paper is capable of meeting the requirements of wearable devices because of its efficient energy-conversion performance, high durability, user comfort, and low cost.

关键词： Wearable nanogenerators Triboelectricity Electrospinning Polyvinylidene fluoride

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An air-stable supported Cu(?) catalyst for azide-alkyne click polymerization

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science China Chemistry 2015年第11期58卷 1748-1752页

作者： Haiqiang Wu Wenhui Dong Zongtan Wang Bicheng Yao Ming Chen Jingzhi Sun Anjun Qin Ben Zhong Tang Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Guangdong Innovative Research Team State Key Laboratory of Luminescent Materials and Devices South China University of Technology Department of Chemistry Institute for Advanced Study Institute of Molecular Functional Materials and State Key Laboratory of Molecular Neuroscience the Hong Kong University of Science and Technology

An air-stable supported Cu(I) catalyst, Cu I@PS-Phen, was designed and synthesized. Cu I@PS-Phen can efficiently catalyze the click polymerization of diynes a and diazides b to produce soluble and thermally stable polytriazoles with high molecular weights(Mw up to 30800), and low copper residue content(down to 190 ppm) in high yields(up to 94.2%) under mild reaction conditions without the exclusion of oxygen.

关键词： azide-alkyne click polymerization copper residue polytriazole supported Cu（I） catalyst

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Microstructure and mechanical properties of BN nanotubes reinforced Si3N4 porous composites

Microstructure and mechanical properties of BN nanotubes rei...

引用

Chinese Materials Congress, CMC 2014

作者： Liu, Hai Kuan Li, Bin Zhang, Chang Rui Wang, Si Qing Liu, Kun Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology ChangshaHunan Province410073 China

ISBN: (纸本)9783038353959

The high dielectric constant of Si3N4 ceramic limited its application as wave-transparent materials, thus Si3N4 ceramics always been prepared as porous ceramics to enhance the properties of wave transparent. While the mechanical properties would be declined in this way, so the BNNTs were used to improve the properties of the composites in this paper. The porous BNNTs/ Si3N4 composites were prepared by normal pressure sintering in nitrogen atmosphere. Then the effects of sintering temperature and contents of BNNTs to Si3N4 porous ceramics and composites were investigated. The results show that the Si3N4 phase was transformed to β-Si3N4 completely when the sintering temperature was raised to 1750℃. The BNNTs and rod-like β-Si3N4 guaranteed the considerable mechanical properties of the composites, and the mechanical properties increased with the increase of the sintering temperature and the addition of the BNNTs. When the sintering temperature was 1750℃ and the content of BNNTs was 0.5wt.%, the porosity and density of the composite are 35% and 2.0g/cm3, respectively. While the flexural strength and the elastic modulus of the composite are 231.8MPa and 62.04GPa, respectively. © (2015) Trans Tech Publications, Switzerland.

关键词： Silicon nitride

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Graphene oxide enabled polymeric shape memory composites for enhanced electro-actuation

Graphene oxide enabled polymeric shape memory composites for...

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作者： Lu, Haibao Liang, Fei Zhu, Shipeng Yang, Yunhua Yao, Yongtao Fu, Y.Q. Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology Harbin China Composite Materials and Structures Laboratory Department of Mechanical Materials and Aerospace Engineering University of Central Florida OrlandoFL United States Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing China Department of Physics and Electrical Engineering Faculty of Engineering and Environment University of Northumbria Newcastle-Upon-Tyne United Kingdom

An effective approach to improve the electrical properties and electro-activated performance of shape memory polymer (SMP) nanocomposites has been demonstrated via a synergistic effect from carbon fibre and self-assembled graphene oxide (GO). The surface modified GO has been grafted onto carbon fibre to enhance the interfacial strength with SMP matrix through van-der-Waals bonds and covalent crosslinking. Carbon fibre enhances the performance of electrical actuation of SMP through Joule heating. Furthermore, the temperature distribution within the SMP nanocomposite during Joule heating becomes uniform, resulting in a significant enhancement of shape recovery and electro-actuation performance of high recovery speed. Copyright © 2015 American Scientific Publishers All rights reserved.

关键词： Graphene

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Origin of the kink in the band dispersion of the ferromagnetic perovskite SrRuO3: Electron-phonon coupling

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Physical Review B 2016年第12期93卷 121102(R)-121102(R)页

作者： H. F. Yang Z. T. Liu C. C. Fan Q. Yao P. Xiang K. L. Zhang M. Y. Li H. Li J. S. Liu D. W. Shen M. H. Jiang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Shanghai 200050 China CAS-Shanghai Science Research Center Shanghai 201203 China State Key Laboratory of Surface Physics Department of Physics and Advanced Materials Laboratory Fudan University Shanghai 200433 China

Perovskite SrRuO3, a prototypical conductive ferromagnetic oxide, exhibits a kink in its band dispersion signaling the unusual electron dynamics therein. However, the origin of this kink remains elusive. By taking advantage of the combo of reactive molecular beam epitaxy and in situ angle-resolved photoemission spectroscopy, we systematically studied the evolution of the low-energy electronic structure of SrRuO3 films with thickness thinning down to a nearly two-dimensional limit in a well-controlled way. The kink structure persists even in the four-unit-cell-thick film. Moreover, through quantitative self-energy analysis, we observed the negligible thickness dependence of the binding energy of the kink, which is in sharp contrast to the downward trend of the Curie temperature with reducing the film thickness. Together with previously reported transport and Raman studies, this finding suggests that the kink of perovskite SrRuO3 should originate from the electron-phonon coupling rather than magnetic collective modes, and the in-plane phonons may play a dominant role. Considering such a kink structure of SrRuO3 is similar to those of many other correlated oxides, we suggest the possible ubiquity of the coupling of electrons to oxygen-related phonons in correlated oxides.

关键词： Electronic structure Growth Phonons Quasiparticles & collective excitations Oxides Ruthenates Thin films Angle-resolved photoemission spectroscopy

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Modified plastic optical fiber coated graphene/polyaniline nanocompositefor ammonia sensing 6

Modified plastic optical fiber coated graphene/polyaniline n...

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6th IEEE International Conference on Photonics, ICP 2016

作者： Khalaf, A.L. Mohamad, F.S. Arasu, P.T. Shabaneh, A.A. Abdul Rahman, N. Lim, H.N. Paiman, S. Yusof, N.A. Mahdi, M.A. Yaacob, M.H. Wireless and Photonics Network Research Centre Engineering and Technology Complex University Putra Malaysia Serdang Selangor43400 Malaysia Department of Computer and Communications Systems Engineering Faculty of Engineering University Putra Malaysia Serdang Selangor43400 Malaysia Department of Physics Faculty of Science University Putra Malaysia Serdang Selangor43400 Malaysia Department of Chemistry Faculty of Science University Putra Malaysia Serdang Selangor43400 Malaysia Functional Devices Laboratory Institute of Advanced Technology University Putra Malaysia Serdang Selangor43400 Malaysia

ISBN: (纸本)9781467381536

In this paper, a side polished multimode plastic optical fiber gas sensor coated with graphene/polyaniline nanocomposite is developed for ammonia gas sensing application. Graphene/polyaniline nanocomposite is deposited onto side polished plastic optical fiber by drop-casting method. The proposed sensor is exposed to different concentration of ammonia varies from 1% to 0.25 % at room temperature. Absorbance response of the gas sensor is monitored and recorded using spectrophotometer system. The absorbance increase linearly with the increase in the ammonia concentrations. The response and recovery time are 24 s and 71.8 s, respectively. © 2016 IEEE.

关键词： Ammonia

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Enhanced electron correlations in the new binary stannide PdSn4: a homologue of the Dirac nodal arc semimetal PtSn4

arXiv

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arXiv 2017年

作者： Xu, C.Q. Zhou, W. Sankar, R. Xing, X.Z. Shi, Z.X. Han, Z.D. Qian, B. Wang, J.H. Zhu, Zengwei Zhang, J.L. Bangura, A.F. Hussey, N.E. Xu, Xiaofeng Advanced Functional Materials Lab Department of Physics Changshu Institute of Technology Changshu215500 China Department of Physics Hangzhou Normal University Hangzhou310036 China Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan School of Physics Key Laboratory of MEMS of the Ministry of Education Southeast University Nanjing211189 China Wuhan National High Magnetic Field Center School of Physics Huazhong University of Science and Technology Wuhan430074 China High Magnetic Field Laboratory Chinese Academy of Sciences Hefei230031 China Max-Planck-Institut fur Festkorperforschung Heisenbergstr. 1 StuttgartD-70569 Germany Radboud University Toernooiveld 7 Nijmegen6525ED Netherlands

The advent of nodal-line semi-metals, i.e. systems in which the conduction and valence bands cross each other along a closed trajectory (line or loop) inside the Brillouin zone, has opened up a new arena for the exploration of topological condensed matter in which, due to a vanishing density of states near the Fermi level, electron correlation effects may also play an important role. In spite of this conceptual richness however, material realization of nodal-line (loop) fermions is rare, with PbTaSe2, ZrSiS and PtSn4 the only promising known candidates. Here we report the synthesis and physical properties of a new compound PdSn4 that is isostructural with PtSn4 yet possesses quasiparticles with significantly enhanced effective masses. In addition, PdSn4 displays an unusual polar angular magnetoresistance which at a certain field orientation, varies linearly with field up to 55 Tesla. Our study suggests that, in association with its homologue PtSn4 whose low-lying excitations were recently claimed to possess Dirac node arcs, PdSn4 may be a promising candidate in the search for novel topological states with enhanced correlation effects. Copyright © 2017, The Authors. All rights reserved.

关键词： Binary alloys

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