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Quantum Dots: CsPbX3Quantum Dots for Lighting and Displays: Room‐Temperature Synthesis, Photoluminescence Superiorities, Underlying Origins and White Light‐Emitting Diodes (Adv. Funct. Mater. 15/2016)

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Advanced Functional materials 2016年第15期26卷

作者： Xiaoming Li Ye Wu Shengli Zhang Bo Cai Yu Gu Jizhong Song Haibo Zeng Institute of Optoelectronics and Nanomaterials Jiangsu Key Laboratory of Advanced Micro and Nano Materials and Technology College of Material science and Engineering Nanjing University of science and Technology Nanjing 210094 P.R. China State Key Laboratory of Mechanics and Control of Mechanical Structures College of Materials science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 P.R. China

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Extreme biomimetic approach for developing novel chitin-GeO2 nanocomposites with photoluminescent properties

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Nano Research 2015年第7期8卷 2288-2301页

作者： Marcin Wysokowski Mykhailo Motylenko Jan Beyer Anna Makarova Hartmut Stocker Juliane Walter Roberta Galli Sabine Kaiser Denis Vyalikh Vasilii V. Bazhenov laroslav Petrenko Allison L Stelling Serguei L. Molodtsovs Dawid Stawski Krzysztof J.Kurzydfowski Enrico Langer Mikhail V Tsurkan Teofil Jesionowski Johannes Heitmann Dirk C. Meyer Hermann Ehrlich Institute of Chemical Technology and Engineering Poznan University of Technology 60965 Poznan Poland Institute of Materials Science TU Bergakademie Freiberg 09599 Freiberg Germany Institute of Applied Physics TU Bergakademie Freiberg 09599 Freiberg Germany Institute of Solid State Physics Dresden University of Technology 01069 Dresden Germany Institute of Experimental Physics TU Bergakademie Freiberg 09599 Freiberg Germany Faculty of Medicine Carl Gustav Carus Department of Anaesthesiology and Intensive Care Medicine Clinical Sensoring and Monitoring TU Dresden 01069 Dresden Germany epartment of Physics St. Petersburg State University 198504 St. Petersburg Russia Department of Mechanical Engineering and Materials Science Duke University 27708 Durham NC USA European X-Ray Free-Electron Laser Facility (XFEL) GmbH 22761 Hamburg Germany ITMO University 197101 St. Petersburg Russia Department of Commodity and Material Sciences and Textile Metrology Technical University of Lodz 90924 LSdz Poland Materials Design Group Faculty of Materials Science and Engineering Warsaw University of Technology PL-02507 Warsaw Poland Institute of Semiconductors and Microsystems TU Dresden 01062 Dresden Germany Leibniz Institute of Polymer Research Max Bergmann Centre for Biomaterials 01062 Dresden Germany

This work presents an extreme biomimetics route for the creation of nano- structured biocomposites utilizing a chitinous template of poriferan origin. The specific thermal stability of the nanostructured chitinous template allowed for the formation under hydrothermal conditions of a novel germanium oxide- chitin composite with a defined nanoscale structure. Using a variety of analytical techniques （FTIR, Raman, energy dispersive X-ray （EDX）, near-edge X-ray absorption fine structure （NEXAFS）, and photoluminescence （PL） spectroscopy, EDS-mapping, selected area for the electron diffraction pattern （SAEDP）, and transmission electron microscopy （TEM））, we showed that this bioorganic scaffold induces the growth of GeO2 nanocrystals with a narrow （150-300 nm） size distri- bution and predominantly hexagonal phase, demonstrating the chitin template＇s control over the crystal morphology. The formed GeO2-chitin composite showed several specific physical properties, such as a striking enhancement in photo- luminescence exceeding values previously reported in GeOR-based biomaterials. These data demonstrate the potential of extreme biomimetics for developing new-generation nanostructured materials.

关键词： extreme biomimetics, chitin-GeO2 photoluminescence, near-edge X-ray absorption fine structure (NEXAFS) spectroscopy

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First-principles Explorations of Low-dimensional Nanostructures:Ferroelectricity,Moire Superlattice,and Polymorph Structures

First-principles Explorations of Low-dimensional Nanostructu...

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The 6th International Conference on Nanoscience and Technology, China 2015 (第六届中国国际纳米科学技术会议)

作者： Menghao Wu Xiao Cheng Zeng Puru Jena Ju Li Department of Nuclear Science and Engineering and Department of Material Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139United States Department of Chemistry and Department of Mechanical & Materials Engineering University of Nebraska-LincolnLincolnNebraska 68588United States Department of Physics Virginia Commonwealth UniversityRichmondVirginia 23284United States School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhanHubei 430074China

Theoretical simulation has become an important method for guiding the design and synthesis of new materials,and in this talk I will introduce our recent results on low-dimensional materials: *** organic nanomaterials are shown to become ferroelectric or even multiferroic through chemical functionalizations,where proton-transfer may induce a giant polarization that is three times larger than the current highest value of organic ferroelectricity.

关键词： first-principles calculations low-dimensional naonstructures ferroelectricity moire superlattice phosphorene polymorphs

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Temperature Control for Nano-Scale Films by Spatially-Separated Atomic Layer Deposition Based on Generalized Predictive Control

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IEEE Transactions on Nanotechnology 2015年第6期14卷 1094-1103页

作者： He, Wen-Jie Zhang, Hai-Tao Chen, Zhiyong Lin, Ji-Long Tian, Kan Shan, Bin Chen, Rong State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Image Processing and Intelligent Control School of Automation State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan430074 China School of Electrical Engineering and Computer Science University of Newcastle CallaghanNSW2308 Australia China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

This paper established a closed-loop temperature control system for a spatially-separated atomic layer deposition (S-ALD) reactor using generalized predictive control (GPC) algorithm. The GPC-based closed-loop control system rapidly and precisely stabilized the reactor temperature in the presence of thermal field disturbances. Compared with the proportion-integration differentiation (PID) control commonly used for S-ALD, the closed-loop GPC system attenuated reaction temperature oscillations when producing two-element nano-scale thin films. Furthermore, the proposed GPC system demonstrated the superiority in multi-element nano-laminates depositing efficiency by reducing the settling time with a substrate moving between different reactors. Electrical and optical properties of films verified the feasibility of the proposed GPC system. Finally, experimental results presented that the microstructure of the deposited ALD nanometer thin film was improved with the developed GPC system, compared with the PID strategy. © 2002-2012 IEEE.

关键词： Atomic layer deposition

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Microstructural analysis of biodegradable Mg-0.9Ca-1.2Zr alloy

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IOP Conference Series: materials science and engineering 2016年第1期147卷

作者： B Istrate C Munteanu V Geanta S Baltatu S Focsaneanu K Earar 'Gheorghe Asachi' Technical University of Iasi Faculty of Mechanical Engineering 43 'D. Mangeron' Street 700050 Iasi Romania Politehnica University of Bucharest Faculty of Materials Science and Engineering 313 Splaiul Independentei 060042 Bucharest Romania 'Gheorghe Asachi' Technical University of Iasi Faculty of Material Science and Engineering 61-63'D. Mangeron' Street 700050 Iasi Romania 'Dunarea de Jos' University of Galati Faculty of Medicine Dental Medicine Al. I. Cuza 35 Street Galati Romania

Magnesium alloys have applications in aerospace and medical applications as biodegradable orthopedic implants. Alloying with biocompatible elements, such as calcium or zirconium contribute to refining the the microstructure and improves corrosion resistance with the formation of an eutectic compound - Mg2Ca at boundary alpha-Mg grains. The purpose of this paper is to present the microstructure throw optical and scanning electron methods and phase and constituents identification with X-ray analysis. The results showed the presence of alpha-Mg grains with formation of a mechanical compound - Mg2Ca and appearance of alpha- Zr phase relatively uniformly distributed in nests.

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Atomically Controllable Pd@Pt Core–Shell Nanoparticles towards Preferential Oxidation of CO in Hydrogen Reactions Modulated by Platinum Shell Thickness

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ChemCatChem 2015年第2期8卷 326-330页

作者： Kun Cao Xiao Liu Qianqian Zhu Prof. Dr. Bin Shan Prof. Dr. Rong Chen State Key Laboratory of Digital of Manufacturing Equipment and Technology Mechanical Science and Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 P.R. China State Key Laboratory of Material Processing and Die & Mould Technology Materials Science and Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 P.R. China School of Optical and Electronic Information Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 P.R. China

The shell-thickness effect of Pd@Pt core–shell nanoparticles (NPs) towards the preferential oxidation of CO in the presence of excess H 2 (PROX) was investigated. Atomically controllable Pd@Pt core–shell nanoparticles were fabricated by using an area-selective atomic layer deposition (ALD) method. A linear growth rate of Pt on a Pd surface monitored with in situ quartz crystal microbalance indicated that the shell thickness could be controlled by varying the number of ALD cycles. The core–shell Pd@Pt NPs showed better activity and selectivity than monometallic NPs. The catalyst with a monolayer Pt shell showed optimal performance and minimal Pt loading. The mechanism of the Pt shell on Pd core catalyzed PROX reactions was studied by DFT simulations. The energy barriers to CO oxidation significantly decreased upon coating the catalyst with Pt, which led to enhanced activity and selectivity, and Pd/Pt 1 monolayer showed the lowest barrier.

关键词： atomic layer deposition core–shell structures nanoparticles oxidation planar model catalysts

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Lubricities of environmentally acceptable lubricants with zinc dialkyldithiophosphate and dibenzyl disulfide on tribological properties of plasma electrolytic oxidation coated A6061-T6 alloy under mixed/boundary lubrication

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Tribology Online 2015年第1期10卷 56-63页

作者： Nakase, Takuya Kato, Shinji Woydt, Mathias Sasaki, Shinya Material Engineering Section Basic Technology R and D Center KYB Corporation Japan 1-12-1 Asamizodai Minami-ku Sagamihara-shi Kanagawa-ken252-0328 Japan Unter den Eichen 87 Berlin12489 Germany Department of Mechanical Engineering Tokyo University of Science 6-3-1 Niijuku Katsushika-ku Tokyo125-8585 Japan

3 different base-stocks (poly-α-olefin, polypropylene glycol and unsaturated TMP ester) and additionally formulations with 2 different additives (1 mass% ZnDTP or 1 mass% dibenzyl disulfide (DBDS)) were used as lubricants to evaluate the tribological properties of A6061-T6 treated by means of plasma electrolytic oxidation in a SRV tribometer (Toil = 80°C, FN = 50 N, v = 50 Hz, 2 mm stroke, 2 hrs). The base oils of PPG and the TMP-ester had better lubricities than the PAO with/without the additives. ZnDTP tend to reduce wear, but when added to PAO and PPG increased the friction. The unsaturated TMP-ester +1 mass% DBDS showed 45% lower friction than PAO + ZnDTP (reference), whereas PPG + DBDS had 30% lower friction. Copyright © 2015 Japanese Society of Tribologists.

关键词： Friction

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Space charge properties of UHMWPE/OibPOSS composites

Space charge properties of UHMWPE/OibPOSS composites

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Zhiqiang Xu George Chen Meng Guo Éric David Michel Fréchette Department of Electronics and Computer Science University of Southampton Southampton UK Department of Mechanical Engineering École de technologie supérieure Montréal Québec Canada Department of Material Science Institut de recherche d'Hydro-Québec Varennes Québec Canada

POSS (Polyhedral Oligomeric SilSesquioxanes) is a type of filler of great interest in the field of polymeric micro and nanodielctrics. The thermal and mechanical properties after incorporation of POSS into polymer via chemical cross-linking or physical blending have been paid much attention to recently. In this paper, the space charge property of microstructured composites consisting of UHMWPE (ultra-high-molecular weight polyethylene) and OibPOSS (OctalsoButyl Polyhedral Oligomeric SilSesquioxanes) was studied. The high-energy shaker mill was used to obtain the composites. Briefly this paper show the space charge profiles for samples with 0wt%, 1wt%, 5wt% OibPOSS contents. The charge injection in all the samples under different applied voltages is not significant. Some homocharge can be observed from the interface between electrode and sample, only in the case of 1wt% and 5wt% composites. The charge injection and decay processing is inactive in the composites samples.

关键词： Space charge Polyethylene Dielectrics Anodes Ball milling

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Study on microstructure and property in heat-affected zone of X80 pipeline steel

Study on microstructure and property in heat-affected zone o...

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作者： Huo, Xiang Dong Tian, Zhen Zhuo Li, Lie Jun School of Material Science and Engineering Jiangsu University Zhenjiang 212013 China School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510641 China

ISBN: (纸本)9783038351214

Experimental methods, such as OM, TEM and property testing, were used to study the HAZ microstructure and property of X80 pipeline steel. HAZ can be divided into three regions, such as coarse grain zone, transition zone and fine grain zone. Granular bainite of CGHAZ consists of bainite ferrite (BF) lath and M/A constituents. Charpy impact energy of the HAZ is much lower than that of base metal, for the grain size of CGHAZ is much larger than that of BM, and crack formation and propagation of granular bainite is easy. © (2014) Trans Tech Publications, Switzerland.

关键词： Heat affected zone

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Growth, structure, and electronic properties of nonpolar thin films on a polar substrate: Cr2O3 on ZnO (0001) and ZnO (0001¯)

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Physical Review B 2015年第16期92卷 165414-165414页

作者： X. Zhu M. D. Morales-Acosta J. Shen F. J. Walker J. J. Cha E. I. Altman Center for Research on Interface Structures and Phenomena (CRISP) Yale University New Haven Connecticut 06520 USA Department of Chemical and Environmental Engineering Yale University New Haven Connecticut 06520 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA Department of Mechanical Engineering and Material Science Yale University New Haven Connecticut 06520 USA

The growth and geometric and electronic structures of Cr2O3 layers on the polar ZnO surfaces were characterized to determine how polar substrates can influence the properties of nonpolar films. X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy (UPS), high resolution transmission electron microscopy (HRTEM), reflection high energy electron diffraction, low energy electron diffraction, x-ray diffraction (XRD), and x-ray reflectivity (XRR) were employed to characterize the growth mode, film quality, and interfacial electronic properties. Chromium oxide growth on ZnO (0001¯) and (0001) followed the same trends: two-dimensional growth with initial disorder followed by the formation of epitaxial Cr2O3 (0001). Despite the initial disorder, HRTEM and XRD/XRR measurements on thicker films revealed an abrupt interface with the Cr2O3 lattice extending all the way to the interface. This indicates that above a critical thickness of 10–15 Cr−O3−Cr repeat units, the entire film reorganizes into an ordered structure. It is postulated that the oxygen remained ordered throughout the growth but that the chromium initially filled interstices randomly in the oxygen sublattice, which allowed the film to eventually grow with a well-defined epitaxial relationship with the substrate. The polar interfaces showed a small band offset that decayed with increasing film thickness, suggesting that the compensating charges at the interface may partially migrate to the film surface. No evidence of formal changes in the Cr oxidation state at the interfaces was seen. On the other hand, statistical analyses of UPS valence band spectra revealed an enhanced density of states near the valence band edge for Cr2O3 on ZnO (0001), consistent with stabilization of the positive interface by filling surface electronic states. In contrast, no significant valence band differences were observed between bulk Cr2O3 and thin Cr2O3 layers on ZnO (0001¯), suggesting a different charge compensation

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