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technology and properties of YAG porous ceramics sintered by pressureless sintering method

Cailiao Rechuli Xuebao/Transactions of materials and Heat Treatment 2014年第SUPPL.1期35卷 8-12页

作者： Song, Jie-Guang Wang, Fang Du, Da-Ming Xu, Ming-Han Li, Shi-Bin Ji, Gang-Chang Chen, Fei School of Mechanical and Materials Engineering Jiujiang 332005 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Hubei Key Laboratory of Advanced Technology of Automotive Components School of Automotive Engineering Wuhan University of Technology Wuhan 430070 China

In order to obtain more function materials sorts using the excellent properties of YAG, the YAG porous ceramics were successfully prepared by pressureless sintering method. The results show that the porosity of YAG porous ceramics sintered at 1500°C is similar with that of YAG porous ceramics sintered at 1550°C, however, the compressive strength of YAG porous ceramics sintered at 1550°C with more sintered necks is higher than that of YAG porous ceramics sintered at 1500°C. The porosity and the compressive strength of YAG porous ceramics sintered with holding time of 2 h are higher than that of YAG porous ceramics sintered with holding time of 1 h. The porosity and the compressive strength of YAG porous ceramics sintered with heating rate of 5°C/min are higher than that of YAG porous ceramics sintered with heating rate of 10°C/min. The porosity and the compressive strength of YAG porous ceramics sintered with removing carbon temperature of 800°C are higher than that of YAG porous ceramics sintered with removing carbon temperature of 1000°C. The suitable technology is sintering at 1550°C, holding for 2 h, heating rate of 5°C/min and removing carbon at 800°C, the porosity and the compressive strength of YAG porous ceramics are 59.4% and 8.55 MPa, respectively.

关键词： Porosity

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Preface photocatalytic materials for energy and environmental applications

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Applied Surface Science 2014年第1期319卷 1-1页

作者： Yu, Jiaguo Jaroniec, Mietek State Key Laboratory of Advanced Technology For Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122# Wuhan430070 China Department of Chemistry and Biochemistry KentState University KentOH44242 United States

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Study on preparation and thermal conductivity of high stability magnetorheological fluids

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Journal of the Chinese advanced materials Society 2014年第2期2卷 130-137页

作者： Haibin Cheng[a] Wang Hong[a] Chaosheng Liu[a][b][*] [a]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China[b]Zhuzhou Lince Group Co. Ltd. Zhuzhou China

A surface modifier, which has lipophilic groups and chelating groups, was synthesized, and used to modify the surface characteristics of carbonyl iron particles and prepare composite magnetic particles (CMPs). Then a set of oil-based magnetorheological (MR) fluids based on the CMPs were prepared. Finally, the relationship between thermal conductivity and concentration of MR fluids were studied, and an analysis model on thermal conductivity and concentration of MR fluids was built. The result shows that there is a linear correlation between thermal conductivity and concentration of MR fluids, namelykeff= 0.0245 Φ − 0.08 andkeff/kf= 0.167 Φ − 0.53 (10 ≤ Φ ≤ 50). Applying this model, the concentration variation of the MR fluids can be acquired on the basis of the thermal conductivity variation, and the model can be used to evaluate the sedimentation stability of the MR fluids.

关键词： magnetorheological fluids composite particles sedimentation thermal conductivity

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Adherence and interaction of cationic quantum dots on bacterial surfaces

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Journal of colloid and interface science 2015年 450卷 388-395页

作者： Cheng Yang Hao Xie Qi-Chang Li En-Jie Sun Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. Electronic address: h.xie@***. School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 PR China. Laboratory of Inorganic Materials Chemistry University of Namur 61 rue de Bruxelles Namur B-5000 Belgium. Electronic address: bao-lian.su@fundp.ac.be.

Understanding molecular mechanisms of interactions between nanoparticles and bacteria is important and essential to develop nanotechnology for medical and environmental applications. Quantum dots (QDs) are specific nanoparticles with unique optical properties and high photochemical stability. In the present study, direct interactions were observed between cationic QDs and bacteria. Distinct fluorescence quenching patterns were developed when cationic QDs interacted with Gram negative and Gram positive bacteria. The aggregation of QDs on bacterial surface as well as fluorescence quenching depends upon the chemical composition and structure of the bacterial cell envelopes. The presence of lipopolysaccharide is unique to Gram-negative bacterial surface and provides negatively charge areas for absorbing cationic QDs. The effects of lipopolysaccharide were proved on fluorescence quenching of cationic QDs. In contrast to Gram-negative bacteria, the presence of teichoic acids is unique to Gram-positive bacterial cell wall and provides negatively charged sites for cationic QDs along the chain of teichoic-acid molecules, which may protect QDs from aggregation and fluorescence quenching. This study may not only provide insight into behaviors of QDs on bacterial cell surfaces but also open a new avenue for designing and applying QDs as biosensors in microbiology, medicine, and environmental science.

关键词： Bacterial cell wall Bacterial surface Cell membrane Fluorescence quenching Gram-negative bacteria Gram-positive bacteria Lipopolysaccharides (LPS) Nanoparticles Quantum dots (QDs) Teichoic-acids

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HIGHLY EFFICIENT GRAPHENE BASED CATALYST FOR OXYGEN REDUCTION REACTION

HIGHLY EFFICIENT GRAPHENE BASED CATALYST FOR OXYGEN REDUCTIO...

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10th IUPAC International Conference on Novel materials and their synthesis NMS-X(IUPAC第十届新材料及其合成国际会议)

作者： Daping He Peng Wu Xu Chen Hui Wu Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070P.R.China

Hitherto, the low electrochemical stability of the catalyst is one of the big issues hindering the commercial application of proton exchange membrane fuel cells (PEMFCs) . In this work, more stable support materials based on functionalized graphene nanosheets (GNS), porous GNS, heteroatom doped GNS, and alternative GNS composites including GNS/nano-carbon (or nano-ceramics) sandwiches, nanoceramic wedged GNS, and core-shell graphene and amorphous carbon composites are prepared and applied in catalysts towards oxygen reduction reaction (ORR). based on the idea of bifunction of GNS to Pt catalysts, highly active and stable Pt/reduced graphene oxide (RGO) catalysts are developed by tuning the O/C atom ratio of RGO supports where the optimized O/C atom ratio of 0.14 is determined. Meantime, both perfluorosulfonic acid (PFSA) functionalized GNS and sulfonic acid group-grafted RGO supported Pt catalysts show a higher catalytic activity and a lower loss rate of electrochemical active area (ECA) in comparison with that of the plain Pt/GNS and conventional Pt/C catalysts. In addition, the N-doped RGO supported Pt catalyst (Pt/NRGO) is synthesized using a lyophilisation-assisted N-doping method, revealing a higher catalytic activity and a lower ECA loss of the Pt/NRGO catalyst to compare with that of the Pt/GO and Pt/C catalysts. In addition, to tackle the stacking issues of GNS which leads to the low mass transport property, the porous GNS are synthesized. Besides, we also describe a new strategy to synthesize GNS hybrids including GNS/nano-carbon (nano-creamics) sandwiches and nano-ceramic wedged GNS architectures. These unique architectures with highly dispersed Pt NPs exhibit much high catalytic activities towards ORR and an excellent electrochemical stability. At last, a new graphene @ amorphous carbon core-shell material also shows an excellent electrochemical property. This work was supported financially by the National Natural Science Foundation of China (NSFC) (No. 5

关键词： catalysts graphene oxygen reduction fuel cells

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Preparation and Effect of Oxygen Annealing on the Electrical and Magnetic Properties of Epitaxial (0001) Zn_(1-x)Co_xO Thin Films

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Journal of Wuhan University of technology(materials Science) 2013年第5期28卷 893-897页

作者：罗嗣俊张联盟 WANG Chuanbin ZHOU Xuan SHEN Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Epitaxial （0001）-oriented Zn1-xCoxO （x= 0.01, 0.05 and 0.1） thin films were grown on c-sapphire substrates by pulsed laser deposition. The XRD analysis, optical transmittance and XPS measurements revealed that the Co2＋ substituted Zn2＋ ions were incorporated into the lattice of ZnO in Zn1-xCoxO thin films. The electrical properties measurements revealed that the Co concentration had a non- monotonic influence on the electrical properties of the Zn1-xCoxO thin films due to the defects resulted from imperfections induced by Co substitution. The resistivity remarkably increased and the carrier concentration remarkably decreased in Zn1-x CoxO thin films after oxygen annealing at 600 ℃ under 15 Pa O2 pressure for 60 mins. Room-temperature ferromagnetic was observed and the ferromagnetic Co amount was smaller than the nominal Co concentration for Zn1-xCoxO samples before oxygen annealing. After oxygen annealing, the Zn1-x CoxO thin films exhibited paramagnetic behavior. It is suggested that the room-temperature ferromagnetic ofZn1-x CoxO thin films may attribute to defects or carriers induced mechanism.

关键词： Zn1-xCoxO thin film pulsed laser deposition oxygen annealing electrical properties magnetic property

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Fluorescence and Judd-Ofelt Analysis of Er3+Doped CaF2 Transparent Ceramic

Fluorescence and Judd-Ofelt Analysis of Er3+Doped CaF2 Trans...

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The 2012 International Conference on advanced material and Manufacturing Science(ICAMMS 2012)

作者： Ruzhen Xing Bingchu Mei Jinghong Song Xiaonv Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Center of Materials Research and Analysis Wuhan University of Technology

In this paper,we evaluated the spectra parameters of *** absorption spectra of Er:CaF2 transparent ceramic was measured at room temperature（RT）.Based on the Judd-Ofelt theory,the intensity parameters were Ω= 5.02×10 cm,Ω = 3.40×10 cm and Ω = 0.38×10cm,and then the values of the radiative transition probabilities,radiative lifetimes and integrated emission cross-sections of excited states were *** width at half maximum（FWHM） of the fluorescence spectra for I→I transition was investigated,being 17 *** decay time was found to be 24.3ms,which is longer than the theoretically calculated value indicating a radiation trapping effect in this work.

关键词： CaF2 transparent ceramic Er3+ Spectroscopic properties Judd-Ofelt theory laser material

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Probing Enhanced Light Absorption of Titania Inverse Opal Films by Photonic Effect for Dye Degradation

Probing Enhanced Light Absorption of Titania Inverse Opal Fi...

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2nd International Conference on Clean Energy Science(第二届清洁能源科学国际会议)

作者： Yu Li Min Wu Bao-Lian Su Laboratory of Inorganic Materials Chemistry University of NamurB-5500 NamurBelgium Laboratory of Living Materials at the State Key laboratory of Advanced technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanHubeiChina Laboratory of Living Materials at the State Key laboratory of Advanced technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhanHubeiChina

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Preparation and study of 0.7(Mg0.8Zn0.2)TiO3·0.3{Ba4Nd28/3Ti18O54·zBi2O3} microwave dielectric ceramics

Preparation and study of 0.7(Mg0.8Zn0.2)TiO3·0.3{Ba4Nd28/3T...

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12th China International Nanoscience and technology Symposium, and the Nano-Products Exposition, CINSTS 2013

作者： Ji, Xiao Li Zhai, Cheng Cheng Zhang, Song State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

ISBN: (纸本)9783038350569

The (Mg0.8Zn0.2)TiO3(MZT) as the foundation is mainly studied to join high dielectric material Ba4Nd28/3Ti18O54·zBi2O3(BNT) to preparation microwave dielectric ceramic 0.7(Mg0.8Zn0.2)TiO3·0.3{Ba4Nd28/3Ti18O54·zBi2O3}(z=0.15, 0.18, 0.2) to improve dielectric properties of MZT. While Bi3+ could reduce the sintering temperature to make MZT and BNT composite in a lower sintering temperature (1200~1230 °C). According to the results of the dielectric properties, density, XRD and SEM tests of the obtained ceramics, we can find out that the amount of doped Bi3+ and the sintering temperature affected the structure and properties of the ceramics. The results show that when z=0.18, 0.7(Mg0.8Zn0.2)TiO3·0.3{Ba4Nd28/3Ti18O54·zBi2O3} sintering at 1230°C can get good dielectric properties: Εr =35.56, Qf =5811GHz, τf =-3.225 ppm/ °C. © (2014) Trans Tech Publications, Switzerland.

关键词： Dielectric properties

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Na(+) intercalation pseudocapacitance in graphene-coupled titanium oxide enabling ultra-fast sodium storage and long-term cycling

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Nature communications 2015年第1期6卷 6929页

作者： Chaoji Chen Yanwei Wen Xianluo Hu Xiulei Ji Mengyu Yan Liqiang Mai Pei Hu Bin Shan Yunhui Huang State Key Laboratory of Materials Processing and Die &Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China. Department of Chemistry Oregon State University Corvallis Oregon 97331-4003 USA. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key Laboratory Wuhan University of Technology Wuhan 430070 China.

Sodium-ion batteries are emerging as a highly promising technology for large-scale energy storage applications. However, it remains a significant challenge to develop an anode with superior long-term cycling stability and high-rate capability. Here we demonstrate that the Na(+) intercalation pseudocapacitance in TiO2/graphene nanocomposites enables high-rate capability and long cycle life in a sodium-ion battery. This hybrid electrode exhibits a specific capacity of above 90 mA h g(-1) at 12,000 mA g(-1) (∼36 C). The capacity is highly reversible for more than 4,000 cycles, the longest demonstrated cyclability to date. First-principle calculations demonstrate that the intimate integration of graphene with TiO2 reduces the diffusion energy barrier, thus enhancing the Na(+) intercalation pseudocapacitive process. The Na-ion intercalation pseudocapacitance enabled by tailor-deigned nanostructures represents a promising strategy for developing electrode materials with high power density and long cycle life.

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