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ISSN 1005-0302
CN 21-1315/TG
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      20 November 2014, Volume 30 Issue 11 Previous Issue    Next Issue
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    Orginal Article
    Effect of Graphene Nanoplate and Silicon Carbide Nanoparticle Reinforcement on Mechanical and Tribological Properties of Spark Plasma Sintered Magnesium Matrix Composites
    Aniruddha Das, Sandip P.Harimkar
    J. Mater. Sci. Technol., 2014, 30 (11): 1059-1070.  DOI: 10.1016/j.jmst.2014.08.002
    Abstract   HTML   PDF
    Processing of magnesium (Mg) matrix composites reinforced with low reinforcement content (up to 4-5 vol.%) of graphene nanoplates (GNPs) and silicon carbide (SiC) nanoparticles using ball milling and spark pasma sintering (SPS) is reported.Near full densification was observed for all the composite compositions at the sintering temperature of 450 °C (soaking time of 5 min and applied pressure of 50 MPa).Detailed analysis of the microstructure and mechanical and tribological (under dry sliding contact with alumina counter-face) properties with reinforcement content in Mg-GNP and Mg-SiC is presented.Mg-GNP and Mg-SiC composites reinforced with bout 2 vol.% of reinforcement content exhibited significant improvement in microhardness and wear resistance as compared with Mg compacts.
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    Facile Synthesis of Bimetallic Au@Pd Nanoparticles with Core-shell Structures on Graphene Nanosheets
    Nanting Li, Shaochun Tang, Xiangkang Meng
    J. Mater. Sci. Technol., 2014, 30 (11): 1071-1077.  DOI: 10.1016/j.jmst.2014.07.018
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    In this paper,we report a simple one-step thermal reducing method for synthesis of bimetallic Au@Pd nanoparticles with core-shell structures on the graphene surface.This new type of Au@Pd-G composites is characterized by transmission electron microscopy,high resolution transmission electron microscopy,X-ray photoelectron spectroscopy and X-ray diffraction.It is found that Au@Pd nanoparticles with an average diameter of 11 nm are well dispersed on the graphene surface,and the Au core quantity as well as the Pd shell thickness can be quantitatively controlled by loading different amounts of metallic precursors,and the involved core-shell structure formation mechanism is also discussed.The ternary Pt/Au@Pd-G composites can also be synthetized by the subsequent Pt doping.The catalytic performance of Au@Pd-G composites toward methanol electro-oxidation in acidic media is investigated.The results show that Au@Pd-G composites exhibit higher catalytic activity,better stability and stronger tolerance to CO poisoning than Pd-G and Au-G counterparts.
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    Facile Synthesis of NiFe2O4/Reduced Graphene Oxide Hybrid with Enhanced Electrochemical Lithium Storage Performance
    Peiyi Zhu, Shuangyu Liu, Jian Xie, Shichao Zhang, Gaoshao Cao, Xinbing Zhao
    J. Mater. Sci. Technol., 2014, 30 (11): 1078-1083.  DOI: 10.1016/j.jmst.2014.08.009
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    In this work,a facile,one-pot route has been applied to synthesize nanohybrids based on mixed oxide NiFe2O4 and reduced graphene oxide (rGO).The hybrid is constructed by nanosized NiFe2O4 crystals confined by few-layered rGO sheets.The formation mechanism and microstructure of the hybrids have been clarified by X-ray diffraction,Raman spectroscopy,scanning electron microscopy,and transmission electron microscopy.Electrochemical tests show that the performance of NiFe2O4 can be considerably improved by rGO incorporation.The performance improvement can be attributed to the two-dimensional conductive channels and the unique hybrid structure rGO constructed.The easy synthesis and good electrochemical performance of NiFe2O4/rGO hybrid make it a promising anode material for Li-ion batteries.
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    Multilayer Graphene:A Potential Anti-oxidation Barrier in Simulated Primary Water
    Hongliang Ming, Jianqiu Wang, Zhiming Zhang, Siyan Wang, En-Hou Han, Wei Ke
    J. Mater. Sci. Technol., 2014, 30 (11): 1084-1087.  DOI: 10.1016/j.jmst.2014.08.011
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    Multilayer graphene as a potential anti-oxidation barrier to protect nickel foils from oxidation was studied in simulated primary water of pressurized water reactors (PWRs).The results show that after immersion for 1000 h,the structure of the multilayer graphene remains unchanged and no obvious oxide film formed on the graphene coated nickel foils,indicating multilayer graphene can effectively act as the anti-oxidation barrier to protect the substrate from oxidation and hence can improve the heat transfer efficiency of the substrate in simulated primary water of PWRs.
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    High Temperature Phase Transitions of Graphene Oxide Paper from Graphite Oxide Solution
    Yan-Jia Liou, Wu-Jang Huang
    J. Mater. Sci. Technol., 2014, 30 (11): 1088-1091.  DOI: 10.1016/j.jmst.2014.08.006
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    Graphene oxide paper (GOP) can be prepared through simplified filtration of a graphite oxide solution.It possesses similar properties to graphene.In this study,the graphite oxide solution was synthesized from commercial graphite by means of Hummer's method.It corresponds to the dried GOP that was prepared by deposition on a cellulose filter.It is found that the mesophase of the dried graphene oxide papers obtained from the graphite was thermotropic hexagonal columnar liquid crystal.Its higher temperature transitions were found at 80 °C,150 °C and 170 °C-180 °C.Therefore,it could be used for thermal storage and conductive materials in the future.
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    Carbon-coated Li4Ti5O12 Anode Materials Synthesized Using H2TiO3as Ti Source
    Lijun Gong, Yuxi Chen, Hongjiang Yu, Hongbo Liu, Caifu Li, Zhi-Quan Liu
    J. Mater. Sci. Technol., 2014, 30 (11): 1092-1095.  DOI: 10.1016/j.jmst.2014.02.002
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    Two low-cost synthesis routes have been developed to fabricate carbon-coated Li4Ti5O12 by using H2TiO3 instead of anatase TiO2 as Ti source through solid-state reaction process.One route is a direct solid mixture of H2TiO3,Li2CO3 and pitch followed by high-temperature solid-state reaction.The other includes mixture of H2TiO3 and Li2CO3 with pitch dissolved in furanidine under vacuum and the same solid-state reaction procedure is followed after the mixture is totally dried.Microstructural investigations indicate that H2TiO3 exhibits secondary aggregates morphology with primary particle sizes of 10-20 nm.Carbon-coating layers with thickness of 2-3 nm have been observed on Li4Ti5O12 synthesized by the two routes.Cyclic performance,rate capability and electrochemical impedance spectrum of the two Li4Ti5O12/C composites have been performed,which indicate that Li4Ti5O12/C obtained by furanidine-assisted mixture exhibits better electrochemical performance than Li4Ti5O12/C synthesized by direct solid mixture.The possible reasons have been discussed.The low-cost synthesis routes of Li4Ti5O12/C using H2TiO3 as Ti source are expected to be more competitive than the traditional one for practical applications.
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    Effect of Grain Size on Phase Transformation and Photoluminescence Property of the Nanocrystalline ZrO2 Powders Prepared by Sol-Gel Method
    Qiong Chen, Yongqin Chang, Changjing Shao, Jing Zhang, Jun Chen, Mingwen Wang, Yi Long
    J. Mater. Sci. Technol., 2014, 30 (11): 1103-1107.  DOI: 10.1016/j.jmst.2014.05.009
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    Nanocrystalline zirconia (ZrO2) powders were prepared by a sol-gel process followed by annealing treatments from 500 to 1200 °C.Phase transformation,microstructural features and photoluminescence properties were characterized by X-ray diffraction,transmission election microscopy and photoluminescence spectra,respectively.The results show that both monoclinic phase and tetragonal phase exist in the nanocrystalline ZrO2 powders at annealing temperature in the range of 500-900 °C,and the concentration of monoclinic phase increases with increasing the annealing temperature.Tetragonal phase is totally transformed to monoclinic phase when annealing temperature is up to 900 °C.The average grain size of the powders also increases when annealing temperature increases.Two emission peaks centered at 390 nm (named as I390) and 470 nm (named as I470) exist in the photoluminescence spectra,and the intensity ratio of I390 to I470 decreases with increasing annealing temperature.The grain size is proposed to be responsible for the phase transformation in the nanocrystalline ZrO2 powders.
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    Co-Doped ZnO Nanoparticles:Structural,Morphological,Optical,Magnetic and Antibacterial Studies
    N.Mohamed Basith, J.Judith Vijaya, L.John Kennedy, M.Bououdina, S.Jenefar, V.Kaviyarasan
    J. Mater. Sci. Technol., 2014, 30 (11): 1108-1117.  DOI: 10.1016/j.jmst.2014.07.013
    Abstract   HTML   PDF
    Un-doped and Co-doped ZnO nanoparticles (NPs) with different weight ratios (0.5,1.0,1.5,and 2.0 wt% of Co) were synthesized by a facile and rapid microwave-assisted combustion method using urea as a fuel.The prepared NPs were characterized by X-ray diffraction (XRD),high resolution scanning electron microscopy (HR-SEM),energy dispersive X-ray analysis (EDX),diffuse reflectance spectroscopy (DRS),photoluminescence (PL) spectroscopy and vibrating sample magnetometry (VSM).XRD patterns refined by the Rietveld method indicated that Co-doped ZnO had a single pure phase with wurtzite structure suggesting that Co2+ ions would occupy Zn2+ ionic sites within the ZnO crystal lattice.Interestingly,the morphology was found to convert substantially from grains to nanoparticles with close-packed periodic array of hexagonal-like shape and then into randomly distributed spherical NPs with the variation of Co-content.The optical band gap estimated using DRS was found to be red-shifted from 3.22 eV for the un-doped ZnO NPs then decrease up to 2.88 eV with increasing Co-content.PL spectra showed a strong green emission band thus confirming the formation of pure single ZnO phase.Magnetic studies showed that Co-doped ZnO NPs exhibited room temperature ferromagnetism (RTFM) and that the saturation magnetization attained a maximum value of 2.203 × 10−3 emu/g for the highest Co-content.The antibacterial studies performed against a set of bacterial strains showed that the 2.0 wt% Co-doped ZnO NPs possessed a greater antibacterial effect.
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    Controllable Synthesis of Well-aligned ZnO Nanorod Arrays on Varying Substrates via Rapid Electrodeposition
    Haibao Zhang, Shaowei Jin, Guotao Duan, Jingjing Wang, Weiping Cai
    J. Mater. Sci. Technol., 2014, 30 (11): 1118-1123.  DOI: 10.1016/j.jmst.2014.04.006
    Abstract   HTML   PDF
    A facile and rapid electrodeposition route was developed to controllably synthesize well-aligned ZnO nanorod arrays on diverse substrates,such as seed-layer pre-formed,pristine indium tin oxide (ITO) and Si,using Zn(NO3)2·6H2O and hexamethylenetetramine (HMT) as the precursors.X-ray diffraction (XRD) and transmission electron microscopy (TEM) results indicated that seed-layer pre-modified of ZnO nanorod arrays (ZNRs) possessed single crystalline,a wurtzite crystal structure with preferential growth orientation along [0001] direction.The ZNRs on pre-modified ZnO seed-layer (ZSL) had diameters of 30-50 nm,and aligned vertically to the substrates.ZNRs on ZSL/ITO substrate exhibited a high transmittance (above 80%) in visible wavelength range and the red-shift of band gap energy.An electrochemical reaction model was proposed to explain the growth process of ZnO nanorods.Importantly,the rapid synthesis of ZNRs provided the feasibility of preparation of SERS (surface enhanced Raman scattering) nanocomposite within shorter time by a subsequent electrochemical etching.
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    Visible Light Photocatalytic Properties and Thermochromic Phenomena of Nanostructured BiOCl Microspheres
    Jiushan Cheng, Cong Wang, Yinfang Cui, Ying Sun, Ying Zuo
    J. Mater. Sci. Technol., 2014, 30 (11): 1130-1133.  DOI: 10.1016/j.jmst.2014.05.011
    Abstract   HTML   PDF
    Black nanostructured BiOCl microspheres were directly synthesized by a hydrothermal method.The black ball-like BiOCl microspheres and black flower-like BiOCl microspheres were obtained using different surfactant.The color of the BiOCl microspheres turned from black to white when being annealed at 400 °C in air for 3 h and could be recovered to black by exposure to ultraviolet light for a few hours.The photocatalytic activity of both the black and the white BiOCl microspheres was characterized by the photo-degradation of methyl orange dye under visible light irradiation.The black ball-like nanostructure BiOCl displayed the best photocatalytic activity,compared with the white BiOCl and the black flower-like BiOCl.It can degrade the methyl orange dye to 20% within 70 min under visible light irradiation.The high activity of the BiOCl ball-like sphere may own to its special morphology,strong absorption in visible light range and the existence of oxygen vacancies.
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    Thermoelectric Transport Properties of RyFe3NiSb12 (R = Ba,Nd and Yb)
    Ruiheng Liu, Jung Young Cho, Jiong Yang, Wenqing Zhang, Lidong Chen
    J. Mater. Sci. Technol., 2014, 30 (11): 1134-1140.  DOI: 10.1016/j.jmst.2014.05.007
    Abstract   HTML   PDF
    To evaluate the influence of Ni substitution on electrical transport properties,the thermoelectric transport properties of the p-type skutterudites RyFe3NiSb12 (R = Ba,Nd and Yb) are systematically investigated from 2.5 K to 800 K.By carefully modifying the filling fractions of the three fillers,Ba,Nd and Yb,the carrier concentration is precisely adjusted,which changes proportionally to the nominal value calculated by valence counting rule.The carrier concentration dependences of mobility and Seebeck coefficient represent two band contribution in the valence band,and the optimized carrier concentration for thermoelectric performance is between (5-9) × 1020 cm−3.The lattice thermal conductivity of samples filled with rare-earth elements (Nd and Yb) are significantly lower as compared to Ba-filled,due to the lower resonant frequency and partial filling.Compared with Co substitution,Ni substitution tends to close the band gap,which results in heavier bipolar diffusion at high temperature for RyFe3NiSb12.However,due to the enhancement of the density of state,when the carrier concentrations are similar,RyFe3NiSb12 possess higher thermal power and thus higher power factor than RyFe2Co2Sb12 in the lower temperature range.A ZT value of 0.73 is obtained for Yb0.77Fe3NiSb12 at 600 K.
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    Short-Term Synaptic Plasticity Mimicked on Ionic/Electronic Hybrid Oxide Synaptic Transistor Gated by Nanogranular SiO2 Films
    Zhaojun Guo, Liqiang Guo, Liqiang Zhu, Yuejin Zhu
    J. Mater. Sci. Technol., 2014, 30 (11): 1141-1144.  DOI: 10.1016/j.jmst.2014.04.015
    Abstract   HTML   PDF
    An indium-zinc-oxide (IZO) based ionic/electronic hybrid synaptic transistor gated by field-configurable nanogranular SiO2 films was reported.The devices exhibited a high current ON/OFF ratio of above 107,a high electron mobility of ~14 cm2 V−1 s−1 and a low subthreshold swing of ~80 mV/decade.The gate bias would modulate the interplay between protons and electrons at the channel/dielectric interface.Due to the dynamic modulation of the transient protons flux within the nanogranular SiO2 films,the channel current would be modified dynamically.Short-term synaptic plasticities,such as short-term potentiation and short-term depression,were mimicked on the proposed IZO synaptic transistor.The results indicate that the synaptic transistor proposed here has potential applications in future neuromorphic devices.
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    Microstructural Development and Mechanical Properties of PM Ti-45Al-2Nb-2Mn-0.8 vol.%TiB2 Processed by Field Assisted Hot Pressing
    R.Mu, oz-Moreno, E.M.Ruiz-Navas, B.Srinivasarao, J.M.Torralba
    J. Mater. Sci. Technol., 2014, 30 (11): 1145-1154.  DOI: 10.1016/j.jmst.2014.08.008
    Abstract   HTML   PDF
    A γ-TiAl intermetallic alloy,Ti-45Al-2Nb-2Mn (at.%)-0.8 vol.%TiB2,has been processed from gas atomized prealloyed powder by field assisted hot pressing (FAHP).An initial analysis of the prealloyed powder helped on the understanding of the intermetallic sintering behavior.Atomized powder consisted of α metastable phase that transformed into α2+γ equilibrium phases by thermal treating.Different powder particle microstructures were found,which influence the microstructure development of the FAHP γ-TiAl material depending on the sintering temperature.Duplex,nearly lamellar and fully lamellar microstructures were obtained at the sintering temperatures above 1000 °C.Lower consolidation temperatures,below 1000 °C,led to the formation of an Al rich phase at powder particle boundaries,which is deleterious to the mechanical properties.High compressive yield strength of 1050 MPa was observed in samples with FAHP duplex microstructures at room temperature.Whereas nearly lamellar and fully lamellar microstructures showed yield strength values of 655 and 626 MPa at room temperature and 440 and 425 MPa at 750 °C,respectively,which are superior in comparison to similar alloys processed by other techniques.These excellent properties can be explained due to the different volume fractions of the α2 and γ phases and the refinement of the PM microstructures.
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    Hydrogen-induced Modification in the Deformation and Fracture of a Precipitation-hardened Fe-Ni Based Austenitic Alloy
    Mingjiu Zhao, Zifeng Guo, Shenghu Chen, Hao Liang, Lijian Rong
    J. Mater. Sci. Technol., 2014, 30 (11): 1155-1159.  DOI: 10.1016/j.jmst.2014.03.017
    Abstract   HTML   PDF
    Hydrogen-induced modification in the deformation and fracture of a precipitation-hardened Fe-Ni based austenitic alloy has been investigated in the present study by means of thermal hydrogen charging experiment,tensile tests,scanning electron microscopy (SEM) and transmission electron microscopy (TEM).It is found that the γ′ particles are subjected to the multiple shearing by dislocations during plastic deformation,which promotes the occurrence of the dislocation planar slip.Moreover,the alloy will be enhanced by hydrogen resulting in the formation of strain localization at macroscale.So,the mechanisms of deformation and fracture in the alloy have been proposed in terms of serious hydrogen-induced planar slip at microscale which can lead to macroscopic strain localization.
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    Performance of Amperometric and Potentiometric Hydrogen Sensors
    Yuejun Ouyang, Xiaojian Wang, Gang Yu, Zhengwei Song, Xueyuan Zhang
    J. Mater. Sci. Technol., 2014, 30 (11): 1160-1165.  DOI: 10.1016/j.jmst.2014.07.001
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    The principle,design,construction and performance of the amperometric and potentiometric sensors for measuring the permeation rate of hydrogen through the wall of metal equipment were investigated in order to develop a new type of hydrogen sensor with high accuracy.The transiet curves of hydrogen permeation under a given charging condition were employed to evaluate the performance of two types of hydrogen sensors.The relative deviation of the hydrogen concentration detected with two types of sensors under the same condition varied from 3.0% to 13%.The accuracy,response time,reproducibility,and installation were discussed and compared.Response time of the potentiometric sensor (E-sensor) was shorter than that of the amperometric sensor (I-sensor).Both types of sensors exhibited good reproducibility.Development of I-sensor composed of a kind of proton conductor adhesives or non-fluid electrolytes which contain two functions of high electrical conductivity and a strong adhesion will be a promising prospect in order to measure hydrogen permeation at high temperature.
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ISSN: 1005-0302
CN: 21-1315/TG
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