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ISSN 1005-0302
CN 21-1315/TG
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      28 February 2012, Volume 28 Issue 2 Previous Issue    Next Issue
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    Thin Film and Coatings
    Fabrication of Optical Tunable Helical Thin Films
    Linxin Hu, Peng Wang, Xingyang Wan, Shaoji Jiang
    J. Mater. Sci. Technol., 2012, 28 (2): 97-102. 
    Abstract   HTML   PDF
    Circular polarization selection of light is an important property of helical micro-nanostructure. The helical thin films fabricated by glancing angle deposition can provide both circular polarization selection and wavelength tuning in this work. Their selective transmissions were depicted in calculations and experiments. The wavelength tuning mechanism was revealed as the relationship between peak wavelength and deposition parameters. Therefore, tunable circular polarization components can be designed according to the mechanism mentioned above and fabricated by glancing angle deposition techniques. Potential applications include tunable optical filters, optical pulse-shapers, biosensors etc.
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    Superhydrophobic Behavior and Optical Properties of ZnO Film Fabricated by Hydrothermal Method
    Jiahong Zheng, Jiling Song, Qing Jiang, Jianshe Lian
    J. Mater. Sci. Technol., 2012, 28 (2): 103-108. 
    Abstract   HTML   PDF
    ZnO film with claviform structure was synthesized on quartz substrates through a hydrothermal method at 90 °C. The microstructure of the film is composed of clusters of submicrometer rods, which therefore endues the film with good superhydrophobicity. Meanwhile, the film with such tanglesome structure also shows highly crystalline quality testified by a strong ultra-violet (UV) emission and very low deep-level emission observed on the photoluminescence (PL) spectrum as well as high transparence of about 89% transmittance in visible light range.
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    Enhanced Performance of Osteoblasts by Silicon Incorporated Porous TiO2 Coating
    Quanming Wang, Hongjie Hu, Yuqing Qiao, Zhengxiang Zhang, Junying Sun
    J. Mater. Sci. Technol., 2012, 28 (2): 109-117. 
    Abstract   HTML   PDF
    Silicon (Si) incorporated porous TiO2 coating (Si-TiO2) prepared on titanium (Ti) by micro-arc oxidation (MAO) technique was demonstrated to be cytocompatible in  previous studies. In view of the potential clinical applications, a detailed in vitro study of the biological activity of Si-TiO2 coating, in terms of osteoblast (MC3T3-E1 cells) morphology, proliferation, differentiation and mineralization was performed. Immunofluorescent staining indicated that cells seeded on the Si-TiO2 coating showed improved adhesion with developing mature cytoskeletons, which contained numerous distinct and well-defined actin stress fibers in the cell membranes compared with those on the TiO2 coating and Ti plate. Results from proliferation assay showed that the proliferation rate of cells seeded on the Si-TiO2 coating was significantly faster than that on the TiO2 coating and Ti plate. Furthermore, the analysis of osteogenic gene expression demonstrated that the Si-TiO2 coating stimulated the expression of osteoblast-related genes and promoted differentiation and mineralization of MC3T3-E1 cells. In addition, the Si-TiO2 coating differentially regulated Wnt signaling pathway by up-regulating the expression of low-density lipoprotein (LDL) receptor-related protein 5 (Lrp5), and downregulating the expression of Dickkopf-1 (Dkk1). All together, these results indicate that the investigated
    titanium with Si-TiO2 coating is biocompatible and a good candidate material used as implants.
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    Flat Absorber Phosphorous Black Nickel Coatings for Space Applications
    V. Maria Shalini, P. Arockiasamy, R. Uma Rani, A.K. Sharma
    J. Mater. Sci. Technol., 2012, 28 (2): 118-124. 
    Abstract   HTML   PDF
    A new process of flat absorber black nickel alloy coating was developed on stainless steel by electrodeposition from a bath containing nickel, zinc and ammonium sulphates; thiocyanate and sodium hypophosphite for space applications. Coating process was optimized by investigating the effects of plating parameters, viz concentration of bath constituents, current density, temperature, pH and plating time on the optical properties of the black deposits. Energy dispersive X-ray spectroscopy showed the inclusion of about 6% phosphorous in the coating. The scanning electron microscopy studies revealed the amorphous nature of the coating. The corrosion resistance of the coatings was evaluated by the electrochemical impedance spectroscopy (EIS) and
    linear polarization (LP) techniques. The results revealed that, phosphorous addition confers better corrosion resistance in comparison to conventional black nickel coatings. The black nickel coating obtained from hypophosphite bath provides high solar absorptance (αs) and infrared emittance (εIR) of the order of 0.93. Environmental stability to space applications was established by the humidity and thermal cycling tests.
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    Effect of Surface Treatment and Metallic Coating on Corrosion Behavior and Biocompatibility of Surgical 316L Stainless Steel Implant
    Ali Parsapour, Saied Nouri Khorasani, Mohammad Hossein Fathi
    J. Mater. Sci. Technol., 2012, 28 (2): 125-131. 
    Abstract   HTML   PDF
    Surface engineering technology is a suitable method for coatings on the metal surfaces or performing surface modification treatment, which can improve corrosion resistance and biocompatibility of metals. In this research, corrosion behavior of Nb coating on H2SO4 and HNO3 treated AISI stainless steel 316L (SS) was evaluated. Nb coating was carried out using physical vapor deposition process on the SS. Characterization techniques including scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) technique were used to investigate the microstructure and morphology of the coated and treated SS. Electrochemical potentiodynamic tests were performed in two types of physiological solutions and compared with the pristine SS specimens.
    Cyclic polarization tests were performed to evaluate resistivity against pitting. Experimental results indicate that Nb coating and surface treatment of the SS had a positive effect on improvement of corrosion behavior. The decrease in corrosion current densities was significant for coated and treated specimens. The corrosion current density was much lower than the values obtained for pristine specimens.
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    High Hole Mobility of GaSb Relaxed Epilayer Grown on GaAs Substrate by MOCVD through Interfacial Misfit Dislocations Array
    Wei Zhou, Xiang Li, Sujing Xia, Jie Yang, Wu Tang, K.M. Lau
    J. Mater. Sci. Technol., 2012, 28 (2): 132-136. 
    Abstract   HTML   PDF
    The structural property of GaSb epilayers grown on semi-insulator GaAs (001) substrate by metalorganic chemical vapor deposition (MOCVD) using Triethylgallium (TEGa) and trimethylantimony (TMSb), was investigated by variation of the Sb:Ga (V/III) ratio. An optimum V/III ratio of 1.4 was determined in our growth conditions. Using transmission electron microscopy (TEM), we found that there was an interfacial misfit dislocations (IMF) growth mode in our experiment, in which the large misfit strain between epilayer and substrate is relaxed by periodic 90 deg. IMF array at the hetero-epitaxial interface. The rms roughness of a 300 nm-thick GaSb layer is only 2.7 nm in a 10 μm×10 μm scan from atomic force microscopy (AFM) result. The best hole density and mobility of 300 nm GaSb epilayer are 5.27×106 cm-3(1.20×106) and 553 cm2?V−1?s−1 (2340) at RT (77 K) from Hall measurement, respectively. These results indicate that the IMF growth mode can be used in MOCVD epitaxial technology similar to molecular beam epitaxy (MBE) technology to produce
    the thinner GaSb layer with low density of dislocations and other defects on GaAs substrate for the application of devices.
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    Modeling and Simulations
    Comparison of Cellular Automaton and Phase Field Models to Simulate Dendrite Growth in Hexagonal Crystals
    Mohsen Asle Zaeem, Hebi Yin, Sergio D. Felicelli
    J. Mater. Sci. Technol., 2012, 28 (2): 137-146. 
    Abstract   HTML   PDF
    A cellular automaton (CA)-finite element (FE) model and a phase field (PF){FE model were used to simulate equiaxed dendritic growth during the solidification of hexagonal metals. In the CA-FE model, the conservation equations of mass and energy were solved in order to calculate the temperature field, solute concentration, and the dendritic growth morphology. CA{FE simulation results showed reasonable agreement with the previously reported experimental data on secondary dendrite arm spacing (SDAS) vs cooling rate. In the PF model, a PF variable was used to distinguish solid and liquid phases similar to the conventional PF models for solidification of pure materials. Another PF variable was considered to determine the evolution of solute concentration. Validation of both models was performed by comparing the simulation results with the analytical model developed by Lipton-Glicksman-Kurz (LGK), showing quantitatively good agreement in the tip growth velocity at a given melt undercooling. Application to magnesium alloy AZ91 (approximated with the binary Mg-8.9 wt% Al) illustrates the di±culty of modeling dendrite growth in hexagonal systems using CA-FE regarding mesh-induced anisotropy and a better performance of PF{FE in modeling multiple arbitrarily-oriented dendrites growth.
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    Numerical Simulation of Solidification of Work Roll in Centrifugal Casting Process
    Nannan Song, Yikun Luan, Yunlong Bai, Z.A. Xu, Xiuhong Kang, Dianzhong Li
    J. Mater. Sci. Technol., 2012, 28 (2): 147-154. 
    Abstract   HTML   PDF
    A program on the solidification process of horizontal centrifugal casting coupled with eutectic carbides segregation has been developed in this paper. Due to the geometrical features of work roll, a cylindrical coordinate system was used. The temperature field of the outer layer at the end of filling process was imported as the initial temperature condition for the solidification process. The model of eutectic carbides segregation caused by different densities between eutectic MC and the molten steel was coupled in the program. The temperature field of the outer layer of work roll during horizontal centrifugal casting process was investigated. Results show that the outer layer has a "sandwich shape" solid fraction manner. Results also indicate that the segregation of eutectic MC is quite severe during centrifugal casting process. It forms four zones of different content of carbides in radial direction. The simulated results of MC carbides segregation phenomenon agree with the experimental observations.
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    First-Principles Calculations on Structure, Elastic and Thermodynamic Properties of Al2X (X=Sc, Y) under Pressure
    Yasemin Oztekin Ciftci, Kemal Colakoglu, Engin Deligoz, Ulku Bayhan
    J. Mater. Sci. Technol., 2012, 28 (2): 155-163. 
    Abstract   HTML   PDF
    To understand deeply the structural, elastic and thermodynamic characteristics of Al2X (X= Sc, Y) compounds in C15 type (space number 227) Cu2Mg structure, we have performed ab-initio density functional theory within the local density approximation (LDA) and the generalized gradient approximation (GGA). The thermodynamic properties of the considered structures are obtained through the quasi-harmonic Debye model. We have presented the results on the basic physical parameters, such as the lattice constant, bulk modulus, pressure derivative of bulk modulus, second-order elastic constants, Zener anisotropy factor, Poisson's ratio, Young's modulus, and isotropic shear modulus. In order to gain further information, the pressure- and temperature-dependent behaviour of the volume, bulk modulus, thermal expansion coefficient, heat capacity, entropy, Debye temperature and Gruneisen parameter were also evaluated over a pressure range of 0-20 GPa for Al2Sc and 0-17 GPa for Al2Y compound and a wide temperature range of 0-2000 K for both compounds. The obtained results were compared with the other reported values.
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    Atomistic Simulation of the Orientation-dependent Plastic Deformation Mechanisms of Iron Nanopillars
    Y. Zhang, D.J. Yu, K.M. Wang
    J. Mater. Sci. Technol., 2012, 28 (2): 164-168. 
    Abstract   HTML   PDF
    Tensile tests were performed on iron nanopillars oriented along [001] and [110] directions at a constant temperature of 300 K through molecular dynamics simulations with an embedded-atom interatomic potential for iron. The nanopillars were stretched until yielding to investigate the onset of their plastic deformation behaviors. Yielding was found to occur through two different mechanisms for [001] and [110] tensions. In the former case, plastic deformation is initiated by dislocation nucleation at the edges of the nanopillar, whereas in the latter case by phase transformation inside the nanopillar. The details during the onset of plastic deformation under the two different orientations were analyzed. The varying mechanisms during plastic deformation initiation are bound to influence the mechanical behavior of such nanoscale materials, especially those strongly textured.
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    Regular Papers
    Thermomechanical Analysis of (Cu0.5Tl0.5)-1223 Substituted by Pr and La
    A.I. Abou Aly, R. Awad, I.H. Ibrahim, M. Kamal, M. Anas
    J. Mater. Sci. Technol., 2012, 28 (2): 169-176. 
    Abstract   HTML   PDF
    The thermomechanical analysis (TMA) of Cu0.5Tl0.5Ba2Ca2-xRxCu3O10-δ, where R=Pr and La, with 0.0≤x≤0.15, was carried out in temperature range from 450 to 1145 K. The samples were prepared by single-step solid state reaction technique. The prepared samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The superconductivity of the prepared samples was investigated by electrical resistivity measurement. The results showed that low substitution content enhanced the (Cu0.5Tl0.5)-1223 phase formation, while the higher substitution content degraded this phase. The higher superconducting transition temperatures Tc were found to be 114 K and 109 K at x= 0.025 for Pr- and La-substitutions, respectively. The average linear thermal expansion coefficient increased as x increased, while the shrinkage temperature decreased as x increased. Those results were emphasized by porosity and Vickers microhardness calculations. Debye temperature θD was calculated from the linear thermal expansion coefficient data and correlated to Tc to estimate the electron-phonon coupling λep.
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    Structure Stability and Oxygen Permeability of Perovskite-type Oxides of Ba0.5Sr0.5Co0.8Fe0.1R0.1O3-δ (R=Al, Mn, Fe, Ce, Cr, Ni, Co)
    Ensieh Ganji Babakhani, Jafar Towfighi, Laleh Shirazi, Ali Nakhaeipour, Akbar Zamaniyan, Zahra Shafiei
    J. Mater. Sci. Technol., 2012, 28 (2): 177-183. 
    Abstract   HTML   PDF
    Perovskite-type Ba0.5Sr0.5Co0.8Fe0.1R0.1O3-δ (R=Al, Mn, Fe, Ce, Cr, Ni, Co) oxide membranes were exploited and synthesized. Oxygen behavior, orderisorder transition and phase stability of these composite oxides were investigated by combined analysis of X-ray diffraction (XRD), temperature programmed desorption (TPD), thermogravimetric-differential thermal analysis (TG-DTA). Oxygen permeation through these membranes was studied by the gas chromatography (GC) method using a high-temperature permeation cell in a wide temperature range from 700 to 950 °C. High permeation fluxes were observed for these materials. The high permeation flux was about 3.19 ml?min-1?cm-2 under air/He gradients at 950 °C, which was achieved
    for Ba0.5Sr0.5Co0.8Fe0.1O3-δ (BSCFNiO) membrane. The results of analysis showed no phase transition for BSCFNiO oxide with increasing temperature and XRD pattern of this material after O2-TPD indicated to sustain a pure perovskite structure after oxygen permeation process.
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    Characterization and Photocatalytic Efficiency of TiO2/Ti Beads Fabricated by Simple Heat-Treatment
    Altangerel Amarjargal, Leonard D. Tijing, Mi-Hwa Yu, Chae-Hwa Kim, Chan-Hee Park, Dong-Won Kim, Cheol-Sang Kim
    J. Mater. Sci. Technol., 2012, 28 (2): 184-192. 
    Abstract   HTML   PDF
    The goal of the present study was to investigate the photocatalytic efficiency of titanium dioxide (TiO2) formed on titanium (Ti) bead substrate (referred herein as TiO2/Ti beads) by heat treatment when exposing to ultraviolet (UV) light irradiation. Escherichia coli was used as the model test organism. The results show 4-log and 7-log decrease in bacterial concentration after a test time of 15 and 120 min, respectively, using TiO2/Ti beads irradiated with UV light in a tin-foil covered beaker. This article presents the potential of TiO2 on Ti bead substrate formed by simple heat-treatment together with UV light for bacterial inactivation.
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ISSN: 1005-0302
CN: 21-1315/TG
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