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Effect of Coated PHB on Properties of Abradable Seal Coating

Journal of Wuhan University of technology(materials Science) 2014年第3期29卷 417-421页

作者：程旭东 XIANG Hongyu YE Weiping MENG Xiaoming MIN Jie LIU Minzhi ZHANG Pu LU Wei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology College of Materials Science and Engineering Wuhan University of Technology

As pore-forming materials, the coated polyop-hydroxybenzoate（short for PHB） and h-BN can be applied in the preparation of abradable seal coatings at high temperature. The characteristics of coating such as morphology, thermal stability and composition were studied by SEM, EDS and FTIR. The results show that the modified PHB will change the remained carbon amount, porosity and pore morphology of the coating, which can affect the properties of coatings. If the pore is small enough in uniform distribution, the coating with 5 MPa bond strength, 30-55 HR45Y superficial hardness and certain of carbon can be suitable to well abradability.

关键词： coated-PHB pore morphology seal coating

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New approach for chiral separation: from polysaccharide-based materials to chirality-responsive polymers

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Science China Chemistry 2014年第11期57卷 1492-1506页

作者： DING Peng CHANG BaiSong QING GuangYan SUN TaoLei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology

Chiral separation that is closely related to daily life is a meaningful research. Polysaccharide-(e.g., cellulose, amylose derivatives) based chiral packing materials afford powerful chiral stationary phases(CSPs) toward a broad range of racemic compounds. However, considering the explosive growth of specific chiral drugs, the separation efficiencies of these CSPs need further improvement, which calls for new approaches and strategies. Smart polymers can change their physical or chemical properties dynamically and reversibly according to the external stimuli(e.g., thermo-, pH, solvent, ion, light, critical parameters for chromatographic separation) exerted on them, subsequently resulting in tunable changes in the macroscopic properties of materials. In addition to their excellent controllability, the introduction of chiral characteristics into the backbones or side-chains of smart polymers provides a promising route to realize reversibly conformational transition in response to the chiral analytes. This dramatic transition may significantly improve the performance of materials in chiral separation through modulating the enantioselective interactions between materials and analytes. With the help of chirality-responsive polymers, intelligent and switchable CSPs could be developed and applied in column-liquid chromatography. In these systems, the elution order or enantioselectivity of chiral drugs can be precisely modulated, which will help to solve many challenging problems that involve complicated enantiomers. In this paper we introduce some typical examples of smart polymers that serve as the basis for a discussion of emerging developments of CPSs, and then briefly outline the recent CSPs based on natural and certain synthetic polymers.

关键词： chiral separation chiral stationary phases（CSPs） enantioseparation HPLC smart polymer

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Chemical equilibrium controlled synthesis of polyoxymethylene dimethyl ethers over sulfated titania

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Journal of Energy Chemistry 2015年第2期24卷 239-244页

作者： Huaju Li Huanling Song Feng Zhao Liwei Chen Chungu Xia Laboratory for Nano-Catalytic Material & Technology Division of Advanced Nano?materials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences

The chemical equilibrium and reaction kinetic behavior in the synthesis of polyoxymethylene dimethyl ethers （DMMn） were investigated over sulfated titania in order to reveal the decisive factor controlling the reaction. The results showed that the molar ratio of adjacent DMMn products in equilibrium solution had the same value, which depended absolutely on the reaction temperature. Meanwhile, the reactions had the same DMMn products distributions under varied reaction conditions. The equilibrium constants of the related step-wise reactions for DMMn formation were equal, which were calculated based on the bulk compositions of the reaction solution. And thus, the selectivity to DMMn was mainly controlled by the chemical equilibrium, i.e., thermodynamic control. In brief, the present results provide some guidance for future synthesis of DMMn.

关键词： polyoxymethylene dimethyl ethers sulfated titania chemical equilibrium reaction kinetic molar ratio

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Effects of Al Addition on the Microstructure and Properties of Nb/Nb_5Si_3 in situ Composites Fabricated via Spark Plasma Sintering

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Journal of Wuhan University of technology(materials Science) 2014年第5期29卷 1036-1038页

作者：龙文元 YAO Junping FU Zhengyi College of Aeronautical Manufacuring Engineering Nanchang Hangkong University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Dense Nb/Nb5Si3 composites were fabricated via spark plasma sintering technology using Nb, Si, and Al elemental powders as raw materials. The microstructttres of the synthesised composites were analyzed through scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results show that the composites consisted of residual Nb particle phase and Nb5Si3 phase. The microstructure of the Nb/ Nb5Si3 in situ composites was evidently affected by Al addition, which prompted the formation of the Al3Nb10Si3 phase. In addition, the Rockwell hardness of the composites decreased with the increase in AI additions. The Rockwell hardness of Nb-20Si is 60HRC, which decreased to approximately 52.7 HRC when the Al content increased to 15 at%. The oxidation resistance of the Nb/NbsSi3 in situ composites significantly improved with the increase in Al addition.

关键词： spark plasma sintering Nb/Nb5Si3 composites oxidation resistance microstructure

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In-situ synthesis and sintering of mullite glass composites by SPS

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Journal of advanced Ceramics 2014年第2期3卷 165-170页

作者： Jinyong ZHANG Hai ZHAN Zhengyi FU Richard TODD State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Materials University of OxfordOxfordUK

The main subject of this work is an investigation of the effects of heating rate and current on the crystallisation of amorphous precursors in spark plasma sintering(SPS).For this,dry gel of Al_(2)O_(3)-SiO_(2) with a molar ratio of 1:1,was synthesized and sintered in-situ by SPS,and also by hot pressing(HP)for *** analysis showed that the only crystalline product in both cases was mullite,whose Al_(2)O_(3) content was lower in the SPS *** microstructures showed a low volume fraction of large mullite fibers in the SPS specimens,whereas a high volume fraction of fine equiaxed grains was present in the HP *** main difference in microstructure between HP and SPS specimens could be explained in terms of the higher heating rate of the SPS *** size of the SPS die also affected the size and aspect ratio of the mullite fibers produced,which might have been due to either the different electrical current required or a difference in specimen temperature profile.

关键词： spark plasma sintering(SPS) synthesis extra-field mullite

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Corrosion behavior of ZrB2ceramics in H2SO4and NaOH solutions

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Rengong Jingti Xuebao/Journal of Synthetic Crystals 2015年 44卷 30-34and46页

作者： Yang, Hai-Tao Li, Jun-Guo Wang, Bo Chen, Liang Shen, Qiang Zhang, Lian-Meng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

The corrosion behavior of ZrB2ceramics in closed system was studied in 4 mol·L-1H2SO4and 14 mol·L-1NaOH solutions. The phase composition and microstructure were investigated by X-ray diffraction (XRD) and field emmision scanning electron microscope (FE-SEM). The results show that the electrochemical corrosion of ZrB2ceramics in H2SO4or NaOH solution is controlled by the anode. ZrB2ceramics in H2SO4are corroded along the crystallographic plane (101) which causes that the corrosion of the end surface (001) of the grain is more serious than the side face (100);the grains of which z axis is not parallel to the polished surface will be corroded into the hexagonal pyramid;with the gradual corrosion, the end surface (001) of the grains of which z axis is parallel to the polished surface are exposed, so that the grains perimeter are corroded into the jagged. ZrB2ceramics in NaOH solution are corroded along the crystallographic plane (110) which causes that both the end surface (001) and the side face (100) of the grain are seriously corroded;the grains of which z axis are not parallel to the polished surface will be corroded into the acicular and the grains of which z axis is parallel to the polished surface will be corroded into the palisaded. © 2015, Chinese Ceramic Society. All right reserved.

关键词： Sodium hydroxide

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Preparation of NiO doped zirconia ceramics and exploration color-causing mechanism of nickel ion

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Rengong Jingti Xuebao/Journal of Synthetic Crystals 2015年 44卷 35-38and46页

作者： Zou, Li-Jie Liu, Hui Jin, Dong-Qin Chen, Fei Jin, Yu Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

A series of zirconia based ceramics were prepared by mixing different content of NiO and 3Y-ZrO2powder together, using pressureless sintering process under 1400. The influence of NiO content on phase composition, color of the ceramics and microstructure were studied. The relationship between microscopic structure and density was established. The relationship between the UV-VIS absorption peak caused by the electron transition and the material color was researched. Phase composition was tested by XRD, SEM and ultraviolet-visible spectrophotometer. Results show that the main phase of the materials are tetragonal and cubic phase zirconia. Nickel oxide does not react with zirconium oxide generating new phase. With the increase of the content of the NiO, diffraction peak intensity of NiO increases. Sintering at 1400, crystal grain grows closely and grain size is uniform. The density is about 99.8% at that temperature. After doping NiO, zirconia ceramics show green. The ultraviolet-visible absorption peaks are in 700-750 nm and 300-400 nm, corresponding to the energy level transition of Ni2+. © 2015, Chinese Ceramic Society. All right reserved.

关键词： Color

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Preparation of B4C-ZrB2-SiC ternary eutectic composites by arc melting and their properties

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materials Research Innovations 2015年 19卷 26-29页

作者： Tu, R. Li, N. Li, Q.Z. Zhang, S. Goto, T. Zhang, L.M. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan430070 China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan430070 China Institute for Materials Research Tohoku University Sendai980-8577 Japan

B4C-ZrB2-SiC composites were synthesised by arc melting in Ar atmosphere using B4C, ZrB2 and β-SiC powders as starting materials. The ternary eutectic composition of 40B4C-20ZrB2-40SiC (mol-%) was first identified and a lamellar eutectic texture was observed. SiC and ZrB2 grains about 1 μm in thickness were uniformly dispersed in B4C matrix of B4C-ZrB2-SiC eutectic composite. B4C (003) and ZrB2 (100) planes were perpendicular to the growth direction. The Vickers hardness of B4C-ZrB2-SiC ternary eutectic composite was 30-34 GPa. The fracture toughness of B4C-ZrB2-SiC composite increased with the decrease of B4C content and the rise of ZrB2 content. © 2015 W. S. Maney & Son Ltd.

关键词： Silicon carbide

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synthesis and optoelectronic properties of a novel molecular semiconductor of dithieno[5,6-b:11,12-b']coronene-2,3,8,9-tetracarboxylic tetraester

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Chinese Chemical Letters 2014年第1期25卷 65-68页

作者： Chun Zhan You-Yu Jiang Ming-Yan Yang Lu-Hua Lu Sheng-Qiang Xiao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology WUT-USG Joint Laboratory of Advanced Optoelectronic Materials and Devices Wuhan University of Technology Center for Chemical and Materials Engineering Wuhan University of Technology

A facile procedure for the synthesis ofdithieno[5,6-b：11,12-b＇]coronene-2,3,8,9-tetracarboxylic tetra（2- ethylhexyl）ester （DTCTI＇E-EH） from readily available perylene-3,4,9,10-tetracaroboxylic dianhydride is described. The electronic properties of DTCTTE-EH were elucidated on the basis of UV-vis spectra, emission spectrum and electrochemical measurement, which demonstrate that DTCTTE is a new class of components for promising semiconducting materials.

关键词： Polycyclic aromatic molecules Coronene tetracarboxylic tetraester Semiconductor Optoelectronic property

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RGD Gifted PDLLA-PRGD Conduits Promotes the Sciatic Nerve Regeneration

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Journal of Wuhan University of technology(materials Science) 2014年第3期29卷 620-625页

作者：方晓青邱彤 XIE Lijuan YIN Yixia LI Binbin YAN Qiongjiao DAI Honglian WANG Xinyu LI Shipu Department of Paediatrics Wuhan General Hospital of Guangzhou Military Biomedical Materials and Engineering Center Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Schwann cells play a key role in peripheral nerve growth and regeneration. The aim of this study was to evaluate the effects of RGD peptides on Schwann cell behavior, and to identify the effects of the modified PDLLA films with RGD in vivo. The results revealed that RGD coating with the concentration of 100-500 ug/mL promoted the cell proliferation and boosted the cell migration. Molecularly, RGD coating also enhanced the expression of the proliferation related genes （c-fos and c-jun） and the cell behavior related genes （actin, tublin, tau and MAP1） at first stages of the seeding, which is similar to the effects from laminin coating. In vivo, RGD addition improved the recovery efficiency of the transected nerve in regard of the more survived Schwann cells in vivo and the formation of more mature myelin sheath. Taken together, RGD peptides are good candidates to enhance the biocompatibility of the biomaterials and facilitate the peripheral nerve regeneration by prompting responses in Schwann ceils.

关键词： ROD Schwann cells cell behavior PDLLA-PRGD conduit sciatic nerve regeneration

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