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synthesis of cubic yttrium aluminum garnet (YAG) powders by co-precipitation and two-step calcinations

AIP Conference Proceedings 2017年第1期1829卷

作者： H. N. Girish C. Zhu F. F. Ma G. Q. Shao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

YAG powders were synthesized by co-precipitation and two-step moderate calcinations at 600/800 °C or 600/900 °C in air, respectively. Two kinds of the synthesized powders both possess pure cubic YAG phases without any secondary phases such as YAH, YAP and YAM, etc.. The former has low agglomeration with nano-sized primary particles and large active energy, and the latter has homogeneously dispersed and well-crystallized particles, with a narrow particle size distribution of 8 - 13 µm.

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The microanalysis of copper-coated diamond composite powders prepared by electroless plating

The microanalysis of copper-coated diamond composite powders...

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International Conference on (ICEPT) Electronic Packaging technology

作者： Lianmeng Zhang Shuya Xiong Ruxia Liu Jian Zhang Guoqiang Luo Qiang Shen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

ISBN: (纸本)9781509013975

Diamond-Cu matrix composite with high thermal conductivity and low coefficient of thermal expansion has been the high-performance thermal management materials. High-performance copper-coated diamond composite powders were successfully prepared using electroless plating at an appropriate bath temperature, pH value, copper ions concentration. The XRD results showed the coated Cu was highly pure with very little oxygen content. The SEM results that the particle size and surface roughness increased, with the increase of bath temperature, pH value, copper ions concentration separately. Finally, diamond-Cu composite powers with dense Cu coating and homogeneous Cu particles could be obtained under the optimum process conditions at the reaction temperature of 45 °C, pH value of 12.5 and copper ions concentration of 0.10 mol/L.

关键词： Copper Ions Surface treatment Diamond Surface morphology Plating Powders

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Superstrengthening Bi2Te3 through Nanotwinning

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Physical Review Letters 2017年第8期119卷 085501-085501页

作者： Guodong Li Umut Aydemir Sergey I. Morozov Max Wood Qi An Pengcheng Zhai Qingjie Zhang William A. Goddard, III G. Jeffrey Snyder State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Chemistry Koc University Sariyer Istanbul 34450 Turkey Department of Computer Simulation and Nanotechnology South Ural State University Chelyabinsk 454080 Russia Department of Chemical and Materials Engineering University of Nevada Reno Reno Nevada 89557 USA Materials and Process Simulation Center California Institute of Technology Pasadena California 91125 USA

Bismuth telluride (Bi2Te3) based thermoelectric (TE) materials have been commercialized successfully as solid-state power generators, but their low mechanical strength suggests that these materials may not be reliable for long-term use in TE devices. Here we use density functional theory to show that the ideal shear strength of Bi2Te3 can be significantly enhanced up to 215% by imposing nanoscale twins. We reveal that the origin of the low strength in single crystalline Bi2Te3 is the weak van der Waals interaction between the Te1 coupling two Te1─Bi─Te2─Bi─Te1 five-layer quint substructures. However, we demonstrate here a surprising result that forming twin boundaries between the Te1 atoms of adjacent quints greatly strengthens the interaction between them, leading to a tripling of the ideal shear strength in nanotwinned Bi2Te3 (0.6 GPa) compared to that in the single crystalline material (0.19 GPa). This grain boundary engineering strategy opens a new pathway for designing robust Bi2Te3 TE semiconductors for high-performance TE devices.

关键词： First-principles calculations material failure Mechanical deformation Semiconductors Stress

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RuP2‐Based Catalysts with Platinum‐like Activity and Higher Durability for the Hydrogen Evolution Reaction at All pH Values

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Angewandte Chemie 2017年第38期129卷

作者： Zonghua Pu Ibrahim Saana Amiinu Zongkui Kou Wenqiang Li Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 Wuhan China

Highly active, stable, and cheap Pt‐free catalysts for the hydrogen evolution reaction (HER) are under increasing demand for future energy conversion systems. However, developing HER electrocatalysts with Pt‐like activity that can function at all pH values still remains as a great challenge. Herein, based on our theoretical predictions, we design and synthesize a novel N,P dual‐doped carbon‐encapsulated ruthenium diphosphide (RuP 2 @NPC) nanoparticle electrocatalyst for HER. Electrochemical tests reveal that, compared with the Pt/C catalyst, RuP 2 @NPC not only has Pt‐like HER activity with small overpotentials at 10 mA cm −2 (38 mV in 0.5 m H 2 SO 4 , 57 mV in 1.0 m PBS and 52 mV in 1.0 m KOH), but demonstrates superior stability at all pH values, as well as 100 % Faradaic yields. Therefore, this work adds to the growing family of transition‐metal phosphides/heteroatom‐doped carbon heterostructures with advanced performance in HER.

关键词： Elektrokatalysatoren N,P-dotierter Kohlenstoff Rutheniumdiphosphid Wasserstoffentwicklung

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Developing an Inositol-Phosphate-Actuated Nanochannel System by Mimicking Biological Calcium Ion Channels

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ACS applied materials & interfaces 2017年第38期9卷 32554-32564页

作者： Qi Lu Qiuhan Tang Zhonghui Chen Shilong Zhao Guangyan Qing Taolei Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China. School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology 122 Luoshi Road Wuhan 430070 P. R. China. Tsinghua-Berkeley Shenzhen Institute Tsinghua University 2279 Lishui Road Shenzhen 518000 P. R. China.

In eukaryotic cells, ion channels, which ubiquitously present as polypeptides or proteins, usually regulate the ion transport across biological membranes by conformational switching of the channel proteins in response to the binding of diverse signaling molecules (e.g., inositol phosphate, abbreviated to InsP). To mimic the gating behaviors of natural Ca channels manipulated by InsPs, a smart poly[(N-isopropylacrylamide-co-4-(3-acryloylthioureido) benzoic acid)] (denoted as PNI-co-ATBA) was integrated onto a porous anodic alumina (PAA) membrane, building an InsP-actuated nanochannel system. Driven by the intensive hydrogen bonding complexation of ATBA monomer with InsP, the copolymer chains displayed a remarkable and reversible conformational transition from a contracted state to a swollen one, accompanied with significant changes in surface morphology, wettability, and viscoelasticity. Benefiting from these features, dynamic gating behaviors of the nanochannels located on the copolymer-modified PAA membrane could be precisely manipulated by InsPs, reflected as a satisfactory linear relationship between real-time variation in transmembrane ionic current and the InsP concentration over a wide range from 1 nmol L to 10 μmol L, as well as a clear discrimination among InsP, InsP, and InsP. This study indicates the great potential of biomolecule-responsive polymers in the fabrication of biomimetic ion nanochannels and other nanoscale biodevices.

关键词： biointerfaces calcium ion channel gating behavior inositol phosphate porous alumina membrane smart polymer

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Cover Feature: Tuning Expanded Pores in Metal–Organic Frameworks for Selective Capture and Catalytic Conversion of Carbon Dioxide (ChemSusChem 21/2018)

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ChemSusChem 2018年第21期11卷 3691-3691页

作者： Wei Meng Prof. Dr. Yongfei Zeng Zibin Liang Wenhan Guo Chenxu Zhi Yingxiao Wu Prof. Dr. Ruiqin Zhong Chong Qu Prof. Dr. Ruqiang Zou Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China Tianjin Key Laboratory of Structure and Performance for Functional Molecules Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Ministry of Education) College of Chemistry Tianjin Normal University Tianjin 300387 China State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China

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Effect of Al and Si additions on the synthesis of spark plasma sintered Zr2Al4C5 ceramic 9th

Effect of Al and Si additions on the synthesis of spark plas...

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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Guo, Qilong Pei, Junjun Gan, Jizhong Li, Junguo Zhang, Lianmeng Key Laboratory of New Building Materials and Building Energy Efficiency of Gansu Province School of Civil Engineering Northwest University for Nationalities Lanzhou730124 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783035710656

The Zr2Al4C5 ceramic was successfully fabricated by the spark plasma sintering at 1800°C for 10 min under uniaxial 20 MPa pressure in vacuum using a mixed raw materials of Zr, Al, Si and graphite powders. The X-ray diffraction analysis results showed that the unexpected Zr2Al3C5 phase rather than target compound Zr2Al4C5 formed in the sintered samples. An initial Zr: Al: C molar ratio of 2:4.2:4.8 for raw powders, and even 55 mol.% excess Al, did not lead to a phase transformation from Zr2Al3C5 to Zr2Al4C5. When 4 wt.% Si was induced in the starting powders, the major phase became Zr2Al4C5 and no obvious Zr2Al3C5 was detected in the sintered samples with an initial Zr: Al: C molar ratio of 2: 6.2: 4.8 (55 mol.% excess Al). The introduction of Si could suppress and even remove additional ZrC, and Si atoms would exclusively occupy the site of Al to make Zr2Al4C5 become a stable solid solution. The scanning electron microscopy observation showed that the as-synthesized Zr2Al4C5 grains had elongated, rod-like and/or plate-like shapes. The mechanical properties of the sintered Zr2Al4C5 ceramic were also investigated, and it showed a hardness of 11.06±0.34 GPa and a fracture toughness of 4.6 ± 0.4 MPa m1/2. © 2016 Trans Tech Publications, Switzerland.

关键词： Scanning electron microscopy

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Binding of Streptavidin to Surface-attached Biotin with Different Spacer Thicknesses

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Journal of Wuhan University of technology(materials Science) 2015年第6期30卷 1304-1309页

作者：李易非张海宁 Wuhan University of Technology Hospital State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The specific binding of receptor to ligand covalently attached to surface with different surface densities was studied using streptavidin-biotin model pair. Biotinylated substrates with different spacer thicknesses as formed through a simple reaction between amine immobilized surfaces and N-hydroxysucciimide groups at the end of biotin modifi ed PEG in anhydrous organic solutions（＂grafting to＂ technique）. The amount of the specifi cally adsorbed protein was measured as a function of spacer thickness between hard surface and biotin moieties. It has been shown that the amount of specifically adsorbed streptavidin decreases with the increase spacer thickness and the protein adsorbs onto the functionalized surfaces in a single molecular manner. It provides an interesting model system for studying single molecular interactions.

关键词： specifi c interaction biotin streptavidin polymer monolayer spacer thickness

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Macromol. Rapid Commun. 5/2018

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Macromolecular Rapid Communications 2018年第5期39卷

作者： Zhengbang Wang Cong Liang Haolin Tang Sylvain Grosjean Artak Shahnas Joerg Lahann Stefan Bräse Christof Wöll Institute of Functional Interfaces Karlsruhe Institute of Technology Hermann‐von‐Helmholtz‐Platz 1 76344 Eggenstein‐Leopoldshafen Germany Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Key Laboratory for the Green Preparation and Application of Functional Materials Ministry‐of‐Education Hubei Key Laboratory of Polymer Materials Hubei University Wuhan 430062 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China China Automotive Technology and Research Center Tianjin 300300 China Institute for Organic Chemistry (IOC) Karlsruhe Institute of Technology (KIT) Fritz‐Haber‐Weg 6 76131 Karlsruhe Germany

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Grain Boundaries Enriched Hierarchically Mesoporous MnO/Carbon Microspheres for Superior Lithium Ion Battery Anode

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Electrochimica Acta 2016年 222卷 561-569页

作者： Huang, Shao-Zhuan Zhang, Qian Yu, Wenbei Yang, Xiao-Yu Wang, Chao Li, Yu Su, Bao-Lian Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road WuhanHubei430070 China Institute for Integrative Nanosciences IFW Dresden Helmholtzstraße 20 01069 Germany University of Namur 61 rue de Bruxelles NamurB-5000 Belgium Department of Chemistry and Clare Hall College University of Cambridge United Kingdom

To develop high-performance anode materials of lithium ion batteries (LIBs) for practical high energy application, a grain boundaries enriched hierarchically mesoporous MnO/C microsphere composite has been fabricated by an in-situ carbonization process. The mesoporous MnO/C microsphere is constructed by abundant grains and grain boundaries that are uniformly embedded in a carbon matrix. Such unique nanoarchitecture exhibits high tap density and structural stability, and provides 3D continuous transport pathways for electrons and Li-ions, enabling high electrochemical stability and improved lithium storage kinetics. As a consequence, the mesoporous MnO/C electrode delivers ever-increasing specific capacity (1200 mAh g−1 after 100 cycles at 100 mA g−1) and excellent rate capability (588 mAh g−1 at 2 A g−1). Such superior lithium storage performance suggests that the hierarchically mesoporous MnO/C microsphere electrode should be one of the most promising anode materials for electric vehicle and grid energy storage application. © 2016 Elsevier Ltd

关键词： Manganese oxide

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