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Magnetism Regulation of (In_(1-x)Fe_x)_2O_3 Semiconductors Prepared by Sol-gel Method

Journal of Wuhan University of technology(materials Science) 2010年第1期25卷 20-23页

作者：高洪孙志刚 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Fe doped In2O3 samples （In1-xFex）2O3 （x=0, 0.05, 0.1, 0.2 and 0.3） on glass substrate were prepared by sol-gel method. The XRD results demonstrate that the solubility of Fe ions in In2O3 matrix is around 20%, above which impurity phase can be observed. The transmittance of the samples with x=0, 0.05, 0.1 and 0.2 are above 80% in the visible region while the transimittance of the glass is 90%. The transmittance curves slightly red-shifts as x increasing. All of the samples except x=0 are ferromagnetic at room temperature. The highest saturation magnetization moment is reached in the sample x=0.2 with 330 emu/cm3, and the coercive force is 169 Oe which is also the largest in our samples. The results indicate that the addition of Fe ions could tune the structure, the ferromagnetism and optical property in the In2O3 matrix.

关键词： Fe doped In2O3 thin films magnetism sol-gel

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The Properties of Solution Precursor Plasma Spray Nanostructured Thermal Barrier Coatings

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Journal of Wuhan University of technology(materials Science) 2010年第6期25卷 924-928页

作者：闵捷 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

About 300 μm thickness uniform thermal barrier coatings （TBCs） were deposited on the 1Cr18Ni9Ti samples by solution precursor plasma spray （SPPS）.The analysis methods,such as TEM,SEM,and XRD were used to characterize the coatings in the aspects of microstructure and phase *** samples were quenched from 1121 ℃ to room temperature by forced-air to measure the thermal cycling *** density were measured by means of water *** experimental results show that grain size of the SPPS TBCs is about 30 nm with desired tetragonal phase ZrO2,and the SPPS TBCs（with 16% porosity） consist of arcuate pores,gelatin and melted *** hardness of the coatings is HR45Y38.5 and bond strength between coatings and substrates is 24.2 *** thermal shock test show the coatings have a average life of 500 cycles which is about 2.5 times than that of conventional air plasma spray （APS） TBCs.

关键词： SPPS TBCs nanostructure properties

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Preparation, Characterization and Dielectric Properties of Sr_5RTi_3Ta_7O_(30) (R=Pr and Eu) Ferroelectric Ceramics

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Journal of Wuhan University of technology(materials Science) 2010年第2期25卷 291-294页

作者：胡长征方亮 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of Education Guilin University of Technology

Polycrystalline samples of Sr5PrTi3Ta7O30 （SPTT） and Sr5EuTi3Ta7O30 （SETT） compounds were prepared by high-temperature solid-state reaction method and their formation, structure and dielectric properties were studied. They are found to be ferroelectric phase of filled tetragonal tungsten bronze （TB） structure at room temperature and undergoes diffuse type of ferroelectric-paraelectric phase transition around 34 ℃ and 31 ℃, respectively. At 1 MHz SPTT exhibits high dielectric constants of 177 and low dielectric losses of 3.5×10^-4 and SETT has high dielectric constants of 125 and low dielectric losses of 2.4×10^-3.

关键词： dielectrics ceramic ferroelectric tungsten-bronze

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Fl–DFO [email protected] silica materials: Highly sensitive and selective nanosensor for dosing with iron ions

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Journal of Colloid and Interface Science 2011年第1期358卷 136-145页

作者： Bao-Lian Su Nicolas Moniotte Noan Nivarlet Li-Hua Chen Zheng-Yi Fu Jonathan Desmet Jing Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Hongshan Luoshi Road 430070 Wuhan China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur (FUNDP) 61 rue de Bruxelles B-5000 Namur Belgium Fonds National de la Recherche Scientifique Rue d’Egmont 5 B-1000 Brussels Belgium

Highly sensitive and selective nanosensor for labile iron pool (LIP) determination, has been designed and prepared by immobilization of Fluoresceine–Desferrioxamine (Fl–DFO), a bifunctional fluoro-siderophore probe molecule with great affinity for iron ions (pK f = 30.7), into highly ordered mesoporous silica structure. Different immobilization methods of Fl–DFO molecules, such as their encapsulation in surfactant micelles used as templating agents for the synthesis of mesoporous silica, direct impregnation into the mesochannels of as-synthesized mesoporous silica and their surface anchoring by covalent binding with propylamine groups implanted by post-synthesis on the internal surface of mesochannels, have been explored. Each nanohybrid has been fully characterized by small angle XRD, TEM, SEM, solid state 29 Si and 13 C MAS NMR and N 2 adsorption–desorption. The fluorescence properties of nanohybrids obtained have been correlated with the immobilization methods, generating interesting information concerning the localization of Fl–DFO molecules in the channels of mesoporous silica. The leaching of Fl–DFO molecules from mesoporous materials has been investigated. The nanosensor prepared by surface anchoring of Fl–DFO at the internal surface of mesochannels showed high performances with no leaching effect and high sensitivity in regards to its responses to ferric ions. Its fluorescence intensity decreased as soon as first Fe III ions are in contact with this nanosensor. A linear relationship between the fluorescence intensity and the ferric ions concentration was observed in low micromolar range. The selectivity of this nanosensor towards other metal ions has also been tested and shown its high affinity to ferric ions. This study can allow the design of a stable, portable, simple, regenerable and cost-effective nanosensor highly sensitive and selective for iron ions with detection limits in the range of cellular LIP in cells, e.g. lower micromolar range.

关键词： Fluoresceine–Desferrioxamine (Fl–DFO) Sensor molecule Mesoporous silica Nanosensor Dosing with iron ions

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Fabrication of low thermal expansion SiC/ZrW2O8 porous ceramics

Fabrication of low thermal expansion SiC/ZrW2O8 porous ceram...

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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Poowancum, A. Matsumaru, K. Juárez-Ramírez, I. Torres-Martínez, L.M. Fu, Z.Y. Lee, S.W. Ishizaki, K. Department of Mechanical Engineering Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka Niigata 940-2188 Japan Universidad Autónoma de Nuevo León Av. Universidad s/n San Nicolás de los Garza NL C.P. 66451 Mexico State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 China Department of Environment Engineering Sun Moon University 100 Kalsan-ri Tangjeong-myeon Asan Chungnam 336-708 Korea Republic of

Low or zero thermal expansion porous ceramics are required for several applications. In this work near zero thermal expansion porous ceramics were fabricated by using SiC and ZrW2O8 as positive and negative thermal expansion materials, respectively, bonded by soda lime glass. The mixture of SiC, ZrW2O8 and soda lime glass was sintered by Pulsed Electric Current Sintering (PECS, or sometimes called Spark Plasma Sintering, SPS) at 700°C. Sintered samples with ZrW2O 8 particle size smaller than 25 μm have high thermal expansion coefficient, because ZrW2O8 has the reaction with soda lime glass to form Na2ZrW3O12 during sintering process. The reaction between soda lime glass and ZrW2O8 is reduced by increasing particle size of ZrW2O8. Sintered sample with ZrW2O8 particle size 45-90 μm shows near zero thermal expansion.

关键词： Silicon carbide

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Photochromic Azo Polysemicarbazides with Biocompatibility Behavior

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Journal of Wuhan University of technology(materials Science) 2010年第6期25卷 979-983页

作者：刘芸熊传溪 School of Materials Science and Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Two kinds of azo polysemicarbazides were prepared based on 3,3＇-azobis（benzoylhydrazide）（ABH） and two kinds of diisocyanates via solution *** structures were characterized by Fourier-transform infrared（FT-IR） technique and elemental *** viscosities of the polymers were 0.32 and 0.29 dL/g and both could be dissolved in H2SO4 and polar organic *** gravimetric analysis（TGA） presented a multi-step degradation and a decomposition temperature range of 230-280 ℃.And photoisomerization of the azo polymers in solvent of N,N-dimethyl acetamide（DMAc） was confirmed by Ultraviolet-visible spectroscopy（UV-Vis）,suggested the isomerization appearing under the ultraviolet irradiation at 365 nm and recovering completely by visible light irradiation or kept in the *** electron microscopy（TEM） of polysemicarbazides before and after soaking in bovine serum albumin（BSA） solution confirmed the biocompatibility of azo polymers.

关键词： azo polysemicarbazides isomerization photochromism biocompatibility

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Dynamic Mechanical and Thermal Properties of Cross-linked Polystyrene/Glass Fiber Composites

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Journal of Wuhan University of technology(materials Science) 2010年第5期25卷 780-784页

作者：朱泉峣陈文 School of Materials Science and Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Cross-linked polystyrene/glass fiber composites were fabricated using cross-linked polystyrene （CLPS） as matrix and E-glass fiber as the reinforcement. Surfaces of E-glass fibers were modified by vinyl triethoxysilane （VTES）, vinyl trimethoxysilane （VTMS） and γ-methacryloylpropyl trimethoxysilane （MPS）. The treated glass fibers were analyzed by fourier transform infrared spectroscopy （FTIR）. Dynamic mechanical thermal analysis （DMTA） and thermo-gravimetric analysis （TGA） were employed to investigate the effect of glass fibers surface modification on viscoelastic behavior and thermal properties. The morphology of fracture surfaces of various composites was observed by scanning electron microscopy （SEM）. The results revealed that these coupling agents were connected to the surfaces of the fibers by chemical bonding. Dynamic mechanical properties as well as thermal stability of the composites were improved considerablely, but to varying degrees depending on the fiber modification. The diversities of improvement of properties were attributed to the different interfacial adhesion between CLPS matrix and the glass fibers.

关键词： polymer-matrix composite cross-linked polystyrene （CLPS） fiber/matrix bond dynamic mechanical thermal analysis.

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Design of leaf-like materials capable of energy conversion and CO2 assimilation

Design of leaf-like materials capable of energy conversion a...

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International Conference on Clean Energy Science 2011年国际清洁能源科学会议(ICCES2011)

作者： Christophe F.Meunier Pierre Van Cutsem Baolian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 WuhanChina Laboratory of Inorganic Materials Chemistry University of NamurB-5000 NamurBelgium Unit of Research in Plant Cellular and Molecular BiologyUniversity of NamurB-5000 NamurBelgium Laboratory of Inorganic Materials ChemistryUniversity of NamurB-5000 NamurBelgium

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Silver Hollow Microspheres: Large-scale synthesis, Characterization and Electromagnetic Shielding Property

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Chinese Journal of Structural Chemistry 2010年第4期29卷 555-564页

作者：王一龙章桥新邵寒梅官建国 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Chemistry School of Sciences Wuhan University of Technology

A facile and large-scale synthesis method to fabricate silver hollow microspheres with controllable morphologies and shell thickness is described using low-cost glass microspheres as templates. The method mainly involves two steps of the preparation of silver-coated glass microsphere core–shell particles by a controllable liquid reduced reaction of Ag[（NH3）2]＋ solution, which only produces silver nanoparticles anchored on the surface of the thiolated glass microsphere templates, and the removal of glass microspheres by wet chemical etching with HF solution. The products are well characterized by field emitted scanning electron microscopy （SEM）, transmitted electron microscopy （TEM）, X-ray photoelectron spectra （XPS）, X-ray diffraction （XRD） and energy dispersive X-ray （EDX） etc. The as-prepared core-shell particles and hollow particles have even and compact silver shells. The electromagnetic shielding coatings based on the silver hollow microspheres are demonstrated to have high conductivity, excellent shielding effectiveness and long durability, suggesting that the silver hollow microspheres obtained here are a novel light-weight electromagnetic shielding filler and will have extensive applications in the electromagnetic compatibility fields.

关键词： electroless plating core-shell particles silver hollow microsphere electromagnetic shielding

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Rapid growth of ZnO hexagonal tubes by direct microwave heating

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International Journal of Minerals,Metallurgy and materials 2010年第1期17卷 80-85页

作者： Zhen-qi Zhu Jian Zhou School of Materials Science and Technology Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Zinc oxide hexagonal tubular crystals were synthesized by direct microwave heating from ZnO powders within 5 min without any metal catalysts or transport agents. ZnO source materials were evaporated from the high-temperature zone in an enclosure, and crystals were grown on the self-source substrate in an appropriate condition. The ZnO vapor formed in the high-temperature zone can deposit and grow on the powders located in the low-temperature zone to form crystals. The scanning electron microscopy （SEM） reveals that these products are hexagonal tube crystals with 80 ~rn in diameter and 250 μm in length, having a well faceted end and side surface. A possible growth mechanism and the influence of reaction temperature on the formation of crystalline ZnO hexagonal tubes were presented. The photoluminescence （PL） exhibits strong ultraviolet emission at room temperature, indicating the potential applications in short-wave light-emitting photonic devices.

关键词： ZnO crystal microwave heating vapor growth photoluminescence （PL）

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