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Structural,Optical,Antibacterial and Antifungal Properties of Zirconia Nanoparticles by Biobased Protocol

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Journal of Materials Science & Technology 2014年第8期30卷 782-790页

作者： S. Gowri R. Rajiv Ganhi M. Sundrarajan Advanced green Chemistry lab Department of Industrial ChemistrySchool of Chemical SciencesAlagappa University

Biological entities and inorganic materials have been in constant touch with each other ever since inception of life on *** method has lots of merits such as not requiring complex procedures,template supporting *** this work,Aloe vera plant mediated synthesis of tetragonal zirconia nanoparticles has been performed and thermogravimetric and differential thermal analysis（TG/DTA）,X-ray diffraction（XRD）,scanning electron microscopy（SEM） with energy dispersive X-ray spectroscopy（EDX）,atomic force microscopy（AFM）,ultraviolet—visible（UV—VIS） technique and Fourier transform infrared spectroscopy（FTIR） have been provided for characterizing the *** of homogeneously distributed spherical zirconia nanoparticles of 50—100 nm in size is *** antimicrobial and antifungal properties are also investigated for synthesis of zirconia nanoparticles and the treated cotton by agar diffusion method against Staphylococcus aureus and Escherichia coli bacterial pathogens and fungal strains Candida albicans and Aspergillus niger,respectively.

关键词： Zirconia nanoparticles Biosynthesis Aloe vera Cotton Antibacterial property

Water Soluble Amino Grafted Silicon Nanoparticles and Their Use in Polymer Solar Cells

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Chinese Journal of Polymer Science 2014年第4期32卷 395-401页

作者： Quan-xiang Yan Zhuo-wei Gu Qi Li Wei-fei Fu Xiao-qiang Chen Wen-qing Liu Hong-bin Pan Mang Wang 陈红征 State Key lab of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang University

Stable aqueous amino-grafted silicon nanoparticles （SiNPs-NH2） were prepared via one-pot solution method. By grafting amino groups on the particle surface, the dispersion of SiNPs in water became very stable and clear aqueous solutions could be obtained. By incorporating SiNPs-NH2 into the hole transport layer of poly（3,4- ethylenedioxythiophene）/polystyrene sulfonic acid （PEDOT＇PSS）, the performance of polymer solar cells composed of poly[2-methoxy,5-（2＇-ethylhexyloxy）-1,4-phenylene vinylene] （MEH-PPV）：[6,6]-phenyl-C61-butyric acid methyl ester （PCBM） as active layer can be improved. SiNPs-NH2 are dispersed uniformly in the PEDOT：PSS solution and help form morphologies with small-sized domains in the PEDOT：PSS film. SiNPs-NH2 serve as screens between conducting polymer PEDOT and ionomer PSS to improve the phase separation and charge transport of the hole transport layer. As a result, the sheet resistance of PEDOT：PSS thin films is decreased from （93 ±5） × 10^5 to （13 ± 3） × 10^5 Ω/□. The power conversion efficiency （PCE） of polymer solar cells was thus improved by 9.8% for devices fabricated with PEDOT＇PSS containing 1 wt% of SiNPs-NH2, compared with the devices fabricated by original PEDOT：PSS.

关键词： SiNPs-NH2 Water-soluble Phase separation Polymer solar cells Transport.

Densification of the Tungsten Heavy Alloys at 1473 K and Fabrication of W-Mo System FGM with Density Gradient

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Journal of Materials Science & Technology 1999年第3期15卷 229-232页

作者： Xiong, HP Zhang, LM Li, JG Yuan, RZ Wuhan Univ Technol State Key Lab Adv Technol Mat Synthesis & Proc Wuhan 430070 Peoples R China

The tungsten heavy alloys with Hi-Al and Fe-Al additives were sintered by hot-press method at 1473 K for 1 h. It was found that the relative density of the W-Fe alloy could be increased evidently by addition of Al. However, the relative density of W-Ni-Al alloy with low content of Al was conversely decreased considerably compared with that of W-Ni alloy. The causes have been studied. The sintering experiments of Mo alloy and W-Mo alloys with 3 wt pet Fe-1.5 wt pet Al additives were also carried out under the same sintering condition of low temperature. Finally, W-Mo system FGM with density gradient was successfully fabricated. Its density changed gradually from 17.0x10(3) kg/m(3) to 9.5x10(3) kg/m(3) within the middle 1.1 mm thickness range.

关键词： Tungsten alloys

INFLUENCE OF TEMPERATURE-DEPENDENT PROPERTIES ON THERMAL STRESSES RESPONSE AND OPTIMUM DESIGN OF C/M FGMS UNDER THERMAL CYCLIC LOADING

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Journal of Wuhan University of Technology(Materials Science) 1997年第4期12卷 7-13页

作者：翟鹏程 State Key lab. Mat. synthesis Proc. Wuhan University of Technology Wuhan 430070 China

The influence of temperature-dependent properties on thermal stresses response and optimum design of newly developed ceramic-metal functionally graded materials under cyclic thermal loaning and high temperature gradient environment is studied. The thermal conductivity of material is considered to be dependent on the temperature. In this paper, the thermal stresses response of the material is calculated rising a nonlinear finite element method. Emphasis is placed on the influence of temperature-dependent properties on the thermal stresses response characteristics, the thermal stresses relaxation property and the thermal stresses history under the different graded compositional distributions and different heat flux magnitudes. Through tile analysis. it is suggested that the influence of temperature-dependent properties can not be neglected In the thermal stresses response analysis and the optimum design process of the material must be based on the temperature-dependent thermo-elastic-plastic theory.

关键词： functionally graded materials temperature-dependent properties cyclic thermal loading thermal stresses response

Influence of Inclusion Shape on Thermoelasto-Plastic Optimun Design of Ceramic Metal Functionally Graded Materials

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Journal of Wuhan University of Technology(Materials Science) 2001年第1期16卷 19-24,29页

作者：王继辉 State Key lab. Mat. synthesis/Proc. Wuhan University of Technology Wuhan 430070 China

A nonlinear finite element method is applied to observe how inclusion shape influence the thermal response of a ceramic-metal functionally graded material (FGM). The elastic and plastic behaviors of the layers which are two-phase isotropic composites consisting of randomly oriented elastic spheroidal Inclusions and a ductile matrix are predicted by cc mean field method. The prediction results show that inclusion shape has remarkable influence on the overall behavior of the composite. The consequences of the thermal response analysis of the FGM are that the response is dependent on inclusion shape and its composition profile cooperatively and that the plastic behavior of each layer should be taken into account in optimum design of a ceramic-metal FGM.

关键词： inclusion shape ceramic-metal functionally graded material mean field method elastoplastic behavior

Liquid Phase Sintering (LPS) and Dielectric Constant of α-Silicon Nitride Ceramic

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Journal of Wuhan University of Technology(Materials Science) 2006年第2期21卷 98-100页

作者：陈常连 State Key lab of Advanced Technology for Materials synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The spark plasma sintering （SPS） was applied to prepare α-Si3 N4 ceramics of different densities with magnesia, silicon dioxide, alumina as the sintering aids. The mechanism of liquid phase sintering （LPS） wus discussed and the factors influencing the density of the prepared samples were analyzed. The dielectric constant of sintered samples was tested. The experimental results show that the density can be controlled from 2.48 g/ cm^3 to 3.09 g/ cm^3 while the content of the sintering aids and the sintering temperature alter and the dielectric constant is closely dependent on the density of obtained samples.

关键词： liquid phase sintering (LPS) spark plasma sintering (SPS) α-silicon nitride sintering aids dielectric constant

Microwave Permeability Change of FeCo Nanocrystalline During High Energy Ball Milling

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Journal of Wuhan University of Technology(Materials Science) 2006年第1期21卷 16-18页

作者：王维官建国 State Key lab of Advanced Technology for Materials synthesis and Processing Wuhan University of Technology Wuhan 430070China

The microwave magnetic properties of the ball milled FeCo panicles were investigated as functions of ball milling time （ t ） using microwave electromagnetic parameters analysis techniques. The results show that the imaginary part of intrinsic dynamic permeability （ ui ） of the ball- milled panicles is much bigger than that of raw powders. ui strongly depends on t and exhibits several slightly damped ferromagnetic resonances. These phenomena are in qualitative agreement with the formation of the corresponding microstructure or the Aharoni ＇ s model of non-uniform exchange resonance modes. The present microwave permeabilhy behavior indicates that nanocrystalline materials with the same grain size may exhibit different properties that depend upon the microstructure, which provides a possibility for manufacturing high performance microwave absorber.

关键词： high energy ball milling carbonyl iron cobalt alloy nanocrystalline microwave electromagnetic parameters

Numerical Simulation of the Temperature Field in Sintering of TiB_2-BN by SPS

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Journal of Wuhan University of Technology(Materials Science) 2006年第3期21卷 126-128页

作者：王玉成 State Key lab of Advanced Technology for Materials synthesis and Processing Wuhan University of TechnologyWuhan 430070 China

The temperature field during the whole process of SPS sintering TiB2 -BN sample was numerically simulated based on the simplification of the temperature rising process. The result shows that the highest temperature is found in the punch and the heat flows from punch to sample and die in SPS sintering system. In the radial direction, the center temperature of the sample is much higher than the circumference temperature of the sampie. In the axial direction, the center temperature of the sample is lower than the border temperature of the sampie. The temperature difference in the sample is growing bigger in the sintering process and reaches the maximum at the end of the heating-up process.

关键词： numerical simulation temperature field SPS TiB2 -BN

Electrorheological Properties of Suspensions of PAn-PEO-PAn Triblock Copolymer Particles

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Journal of Wuhan University of Technology(Materials Science) 2005年第4期20卷 43-45页

作者：马会茹 State Key lab of Advanced Technology for Materials synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The PAn-PEO-PAn triblock copolymer with the PEG chain length of 400 was synthesized by chemical oxidation copolymerization of aniline and α,ω-bis（p-aminophenyl）poly（ethylene glycol）and characterized by FT-IR and *** experimental results show that the copolymer particles are of μtypical core-shell structure after the self-assembly process in *** conductivity is much lower than that of the pure *** suspension containing 20 vol% PAn-PEO-PAn tiblock copolymer in silicone oil exhibits.a typical electrorheological （ER） effect in DC electric *** it shows a lower leakage current density than that of the pure PAn-based ER ***,the PEO shell hinders the electric hop among PANI chains and decreases the current density of ER fluids in an external electric *** the same time the interface polarity improves the ER effects.

关键词： PAn-PEO-PAn triblock copolymer core-shell particles ER properties