Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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      20 January 2015, Volume 31 Issue 1 Previous Issue    Next Issue
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    Orginal Article
    Size Dependent Physical Properties of Nanostructured α-Fe2O3 Thin Films Grown by Successive Ionic Layer Adsorption and Reaction Method for Antibacterial Application
    A.U. Ubale, M.R. Belkhedkar
    J. Mater. Sci. Technol., 2015, 31 (1): 1-9.  DOI: 10.1016/j.jmst.2014.11.011
    Abstract   HTML   PDF
    Thin films of nanostructured α-Fe2O3 with thickness of 156, 203 and 251 nm were deposited by successive ionic layer adsorption and reaction (SILAR) method onto glass substrates using FeCl3·6H2O and NaOH as cationic and anionic precursors. The X-ray diffraction studies revealed that, α-Fe2O3 thin films are nanocrystalline in nature with rhombohedral structure. The morphological properties were investigated by field emission scanning electron and atomic force microscopy. The optical studies showed that α-Fe2O3 exhibits direct as well as indirect optical band gap energy. The electrical resistivity of α-Fe2O3 at 305 K decreases from 11.76 × 102 to 9.46 × 102 Ω cm as film thickness increases from 156 to 251 nm. The thermo-emf measurements confirmed that α-Fe2O3 exhibits n-type conductivity. The nanocrystalline α-Fe2O3 exhibits antibacterial character against Staphylococcus aureus and its efficiency increases from 37.50% to 87.50% depending on crystallite size.
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    Growth of Variable Aspect Ratio ZnO Nanorods by Solochemical Processing
    Marivone Gusatti, Daniel A.R. Souza, Nivaldo C. Kuhnen, Humberto G. Riella
    J. Mater. Sci. Technol., 2015, 31 (1): 10-15.  DOI: 10.1016/j.jmst.2014.08.001
    Abstract   HTML   PDF
    In this work, variable aspect ratio (length divided by diameter) zinc oxide nanorods were synthesized through a simple solochemical method by reacting a Zn2+ precursor with sodium hydroxide at low reaction temperatures. The analysis of the X-ray diffraction data indicated that the samples had hexagonal wurtzite structure and nanometric size crystallites. The transmission electron microscopy (TEM) images of the products prepared at 60 and 80 °C exhibited rod-like architecture, showing that the reaction temperature did not affect the ZnO morphology. The average aspect ratio of the ZnO nanorods decreased from 3.4 to 2.4 when the reaction temperature was raised from 60 to 80 °C. The samples presented a blue shift in the excitonic absorption compared to ZnO bulk that increased alongside with reaction temperature. In addition, this research investigated the results obtained by varying the concentration of zinc chloride solution. At the same temperature, it could be verified that when the zinc concentration was increased, the diameter of the ZnO nanorods also slightly increased, and much shorter nanorods were achieved, especially in the reactions performed at 50 and 70 °C. Finally, the growth mechanism of the ZnO nanostructures was proposed based on the results obtained by changing the zinc precursor concentration and reaction temperature.
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    Preparation of Silver Nanowires via a Rapid, Scalable and Green Pathway
    Cheng Yang, Youhong Tang, Zijin Su, Zhexu Zhang, Cheng Fang
    J. Mater. Sci. Technol., 2015, 31 (1): 16-22.  DOI: 10.1016/j.jmst.2014.02.001
    Abstract   HTML   PDF
    Rapid synthesis of silver nanowires (Ag NWs) with high quality and a broad processing window is challenging because of the low selectivity of the formation of multiply twinned particles at the nucleation stage for subsequent Ag NWs growth. Herein we report a systematic study of the water-involved heterogeneous nucleation of Ag NWs with high rate (less than 20 min) in a simple and scalable preparation method. Using glycerol as a reducing agent and a solvent with a high boiling point, the reaction is rapidly heated to 210 °C in air to synthesize Ag NWs with a very high yield in gram level. It is noted that the addition of a small dose of water plays a key role for obtaining highly pure Ag NWs in high yield, and the optimal water/glycerol ratio is 0.25%. After investigating a series of forming factors including reaction temperature and dose of catalysts, the formation kinetics and mechanism of the Ag NWs are proposed. Compared to other preparation methods, our strategy is simple and reproducible. These Ag NWs show a strong Raman enhancement effect for organic molecules on their surface.
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    Fabrication of TiO2 Nanotube Arrays by Rectified Alternating Current Anodization
    Han Song, Jing Shang, Chen Suo
    J. Mater. Sci. Technol., 2015, 31 (1): 23-29.  DOI: 10.1016/j.jmst.2014.07.005
    Abstract   HTML   PDF
    Anodization is a popular method of preparing TiO2 nanotube array films (TiNTs) by using direct current (DC) power as the driving voltage. In this study, three driving voltage modes, namely, the sine alternating current (sine) mode, the full-wave rectification of sine waves via four diodes (sine-4D, where D means diode) mode, and the DC mode, were used to prepare TiNTs by anodization. At 20 V, TiNTs were formed under sine-4D mode but only irregular porous TiO2 films were formed under DC mode. At 50 V, TiNTs formed under both the sine-4D and DC modes. No TiNTs formed in the sine mode anodization at either 20 or 50 V. Compared with the DC mode, the sine-4D mode required a lower oxidation voltage for TiNT formation, which suggests that sine-4D is an economical, convenient, and efficient driving voltage for TiNT preparation by anodization. The morphologies and structures of TiNT samples anodized at 50 V in the sine-4D and DC modes at different oxidation time (1, 5, 10, 30, 60, and 120 min) were analyzed. TiNT growth processes were similar between the studied modes. However, the growth rate of the films was faster under the sine-4D mode than the DC mode during the first 30 min of anodization.
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    Reduced Graphene Oxide Supported Bimetallic Cobalt-Palladium Nanoparticles with High Catalytic Activity towards Formic Acid Electro-oxidation
    Nanting Li, Shaochun Tang, Xiangkang Meng
    J. Mater. Sci. Technol., 2015, 31 (1): 30-36.  DOI: 10.1016/j.jmst.2014.09.007
    Abstract   HTML   PDF
    In this work, we report the growth of uniformly dispersed bimetallic cobalt-palladium nanoparticles (NPs) on reduced graphene oxide (RGO) nanosheets to prepare CoPd-RGO composites via a two-step procedure, where firstly formed Co NPs are used as seeds for the subsequent growth of Pd. The generation of Co NPs on RGO is performed by an in-situ reduction reaction with the reducer ethylene glycol under oil bath at 180 °C. According to composition, size and microstructure analyses, NPs in the resulting CoPd-RGO have an average particle size of 5 nm, and Pd is added to one side of Co NPs, thus forming Co-Pd bimetallic interfaces. The involved formation mechanism is suggested. The composite is used as an electro-catalyst for the formic acid oxidation in alkaline electrolyte, and the catalytic performance is investigated by cyclic voltammetry and chronopotentiometry etc. The results show that the composite has the highest electro-catalytic activity, the best electrochemical stability and the highest resistance to CO poisoning than those of the monometallic composite and commercial Pd black at the same loading. This is due not only to the small size of NPs with Co-Pd bimetallic interfaces providing more active atoms accessible for reactants, but also to the electric synergistic effect between metals and graphene.
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    Influence of Substrate Negative Bias on Structure and Properties of TiN Coatings Prepared by Hybrid HIPIMS Method
    Zhenyu Wang, Dong Zhang, Peiling Ke, Xincai Liu, Aiying Wang
    J. Mater. Sci. Technol., 2015, 31 (1): 37-42.  DOI: 10.1016/j.jmst.2014.06.002
    Abstract   HTML   PDF
    TiN coatings were deposited using a hybrid home-made high power impulse magnetron sputtering (HIPIMS) technique at room temperature. The effects of substrate negative bias voltage on the deposition rate, composition, crystal structure, surface morphology, microstructure and mechanical properties were investigated. The results revealed that with the increase in bias voltage from -50 to -400 V, TiN coatings exhibited a trend of densification and the crystal structure gradually evolved from (111) orientation to (200) orientation. The growth rate decreased from about 12.2 nm to 7.8 nm per minute with the coating densification. When the bias voltage was -300 V, the minimum surface roughness value of 10.1 nm was obtained, and the hardness and Young's modulus of TiN coatings reached the maximum value of 17.4 GPa and 263.8 GPa, respectively. Meanwhile, the highest adhesion of 59 N was obtained between coating and substrate.
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    Microstructure and Mechanical Properties of Fe-based Amorphous Composite Coatings Reinforced by Stainless Steel Powders
    H. Zhou, C. Zhang, W. Wang, M. Yasir, L. Liu
    J. Mater. Sci. Technol., 2015, 31 (1): 43-47.  DOI: 10.1016/j.jmst.2014.09.008
    Abstract   HTML   PDF
    In this study, a few Fe-based amorphous matrix composite coatings reinforced with various portions (4, 8 and 16 vol.%) of 316L stainless steel powders have been successfully produced through high velocity oxy-fuel (HVOF) spraying. The microstructure of the composite coatings was systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The main structure of composite coatings remained amorphous while 316L stainless steel splats were distributed homogeneously in the amorphous matrix and well connected with surrounding amorphous phase. Bonding strength of coatings to the substrate was determined by “pull-off” tensile tests. The results revealed that the 316L stainless steel phase effectively improved the bonding strength of amorphous coatings, which is mainly contributed by the strong metallurgical bonding between stainless steel and amorphous splats. The addition of 316L stainless steel also enhanced the ductility and fracture resistance of the coatings due to the ductile stainless steel phases, which can arrest crack propagation and increase energy dissipation.
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    Real Time,in situObservation of the Photocatalytic Destruction ofSaccharomyces cerevisiaeCells by Palladium-modified Nitrogen-doped Titanium Oxide Thin Film
    Jingtao Zhang, Qi Li, Ronghui Li, Jian Ku Shang
    J. Mater. Sci. Technol., 2015, 31 (1): 48-54.  DOI: 10.1016/j.jmst.2014.08.003
    Abstract   HTML   PDF
    Palladium-modified nitrogen-doped titanium oxide (TiON/PdO) thin film was synthesized by the ion-beam-assisted deposition technique, which enabled a heavy nitrogen doping and the subsequent light absorption extension to ~700 nm for a better usage of the solar spectrum. Based on TiON/PdO thin film and a phase contrast microscope, a micro-reaction chamber was developed, which allowed the simultaneous optical excitation of the photocatalytic thin film and the phase contrast image observation of cells in it. The real time,in situobservation of the photocatalytic destruction ofSaccharomyces cerevisiae(S. cerevisiae), an essential eukaryotic unicellular model of living cells, was conducted with this new observation technique, which demonstrated clearly that the photocatalytic destruction effect was much stronger than the photodamage effect caused by the visible light irradiation alone in the disinfection process.
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    Mechanical, Microstructural and Tribological Properties of Reactive Magnetron Sputtered Cr-Mo-N Films
    Dongli Qi, Hao Lei, Tiegang Wang, Zhiliang Pei, Jun Gong, Chao Sun
    J. Mater. Sci. Technol., 2015, 31 (1): 55-64.  DOI: 10.1016/j.jmst.2014.10.001
    Abstract   HTML   PDF
    The Cr-Mo-N films were deposited on high speed steel (HSS) substrates by a DC reactive magnetron sputtering equipment coupled with two horizontal magnetron sources. The effects of substrate negative bias voltage (Vb), substrate temperature (Ts) and gas flow ratio (R = N2/(N2 + Ar)) on the microstructure, morphology, as well as the mechanical and tribological properties of the Cr-Mo-N films were investigated by virtue of X-ray diffraction (XRD) analysis, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), nano-indentation test, ball-on-disk tribometer, and Rockwell indenter et al. With increasing Vb to -100 V, the preferred orientation of the films changed from (111) to (200) and their mechanical and tribological properties were improved gradually, too. It was also found that Ts gave a significant effect on mechanical property enhancement. When the Ts reached 300 °C, the film obtained the highest hardness and effective elastic modulus of approximately 30.1 and 420.5 GPa, respectively and its critical load increased to about 54 N. With increasing R, the phase transformation from body-centered-cubic (bcc) Cr and hexagonal CrMoNx multiphase to single face-centered-cubic (fcc) solid solution phase was observed. The correlations between values of hardness (H), effective elastic modulus (E*), H/E*, H3/E*2, elastic recovery (We) and tribological properties of the films were also investigated. The results showed that the elastic recovery played an important role in the tribological behavior.
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    n-type Polycrystalline Si Thick Films Deposited on SiNx-coated Metallurgical Grade Si Substrates
    Hongliang Zhang, Liqiang Zhu, Liqiang Guo, Yanghui Liu, Qing Wan
    J. Mater. Sci. Technol., 2015, 31 (1): 65-69.  DOI: 10.1016/j.jmst.2014.04.012
    Abstract   HTML   PDF
    For photovoltaic applications, low-cost SiNx-coated metallurgical grade silicon (MG-Si) wafers were used as substrates for polycrystalline silicon (poly-Si) thick films deposition at temperatures ranging from 640 to 880 °C by thermal chemical vapor deposition. X-ray diffraction and Raman results indicated that high-quality poly-Si thick films were deposited at 880 °C. To obtain n-type poly-Si, the as-deposited poly-Si films were annealed at 880 °C capped with a phosphosilicate glass. Electrical properties of the n-type poly-Si thick films were investigated by four-probe and Hall measurements. The carrier concentration and electron mobility of the n-type poly-Si film was estimated to be 1.7 × 1019 cm-3 and 68.1 cm2 V-1 s-1, respectively. High-quality poly-Si thick films deposited on MG-Si wafers are very promising for photovoltaic applications.
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    SiC Nanowires Toughed HfC Ablative Coating for C/C Composites
    Hejun Li, Yongjie Wang, Qiangang Fu, Yanhui Chu
    J. Mater. Sci. Technol., 2015, 31 (1): 70-76.  DOI: 10.1016/j.jmst.2014.03.024
    Abstract   HTML   PDF
    In order to improve ablation resistance of carbon/carbon (C/C) composites, SiC nanowires were prepared on C/C composites surface in prior through chemical vapor reaction before HfC coating. SiC nanowires grew randomly and had good combination with HfC coating. SiC nanowires toughed HfC coating had lower linear and mass ablation rates than original HfC coating. The surface was much flatter and exhibited smaller cracks in center region. The ablation mechanism of HfC coating has been changed by SiC nanowires. Thicker HfO2 fused layer was formed on the surface of the toughed HfC coating, which could provide efficient protection for C/C composites. Therefore, SiC nanowires toughed HfC coating behaved in better ablation resistance.
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    Ablative and Mechanical Properties of C/C-ZrC Composites Prepared by Precursor Infiltration and Pyrolysis Process
    Kezhi Li, Jing Xie, Hejun Li, Qiangang Fu
    J. Mater. Sci. Technol., 2015, 31 (1): 77-82.  DOI: 10.1016/j.jmst.2014.01.015
    Abstract   HTML   PDF
    C/C-ZrC composites with continuous ZrC matrix were prepared by precursor infiltration and pyrolysis process using zirconium-containing polymer. Ablation properties of the composites were investigated by oxyacetylene flame with heat flux of 2380 and 4180 kW/m2, respectively. The results showed that C/C-ZrC composites exhibited excellent ablation resistance under the heat flux of 2380 kW/m2 for 120 s and a tree-coral-like ZrO2 protective layer formed after ablation. However, when the heat flux increased to 4180 kW/m2, the maximum temperature of ablated surface reached 2500 °C and a strong degradation of ablation resistance was observed due to the weak bonding between the formed ZrO2 layer and the composites. The flexural strength of C/C-ZrC composites was 110.7 ± 7.5 MPa. There were a large number of carbon fiber bundles pull-out, and the composites exhibited a pseudo-plastic fracture behavior.
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    Effects of Increasing Tungsten on Structural, Elastic and Optical Properties of xWO3-(40-x)Ag2O-60Te2O Glass System
    M.M. Umair, A.K. Yahya, M.K. Halimah, H.A.A. Sidek
    J. Mater. Sci. Technol., 2015, 31 (1): 83-90.  DOI: 10.1016/j.jmst.2014.10.002
    Abstract   HTML   PDF
    Ternary tellurite glasses with composition of xWO3(40-x)Ag2O-60TeO2 (x = 0-40 mol%) have been prepared by melt-quenching method. Elastic and optical properties of the glass system were obtained by ultrasonic velocity measurements and UV-vis spectroscopy, respectively, while structural investigation was carried out by using Raman spectroscopy. The longitudinal and shear velocities, vL and vs showed large increase at x from 0 to 20 mol% before decrease with further addition of WO3. Independent longitudinal modulus CL and shear modulus μ bulk modulus Ke Young's modulus Y and Debye temperature θD showed similar behaviors to both velocities. The large increase of the elastic moduli at x from 0 to 20 mol% is suggested to be due to the increase in WO6 octahedral unit structure indicating the increase of bridging oxygen (BO) and formation of stronger Te-O-W bonds compared to Te-O-Te bonds. On the other hand, for x > 20 mol%, the decrease in the elastic moduli was due to the increase of non-bridging oxygen (NBO) as a result of formation of WO4 tetrahedral via breaking Te-O-W network. Further analysis by using bulk compression and ring deformation models showed a slight decrease in the ratio of ideal bulk modulus Kbc to the experimental bulk modulus Ke and average atomic ring size, l for x < 20 mol% followed by a large increase for x > 20 mol%. Our analysis also indicates that limited ring deformation took place and the main compression mechanism in this glass system was mainly ideal isotropic compression. On the other hand, optical band gap Eopt showed small variation for x = 0-20 mol% but decreased upon higher WO3 content while refractive index n showed the opposite trend. This optical behavior is suggested to be related to the changes in cross link density and NBO concentration in the glass system.
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    Approach to the Theoretical Strength of Ti-Ni-Cu Alloy Nanocrystals by Grain Boundary Design
    Alexandr M. Glezer, Nadezhda A. Shurygina, Elena N. Blinova, Inga E. Permyakova, Sergey A. Firstov
    J. Mater. Sci. Technol., 2015, 31 (1): 91-96.  DOI: 10.1016/j.jmst.2014.09.006
    Abstract   HTML   PDF
    The grain boundary design was used to introduce boride Ti2B and TiB2 nanoparticles of 5 nm in size into grain boundaries of nanocrystalline Ti50Ni25Cu25 alloy. As a result, the maximum normalized microhardness was increased by 20% and the theoretical limit of hardness is substantially approached. It is proposed that boride nanoparticles suppressed low-temperature grain-boundary sliding and, therefore, shifted the range of the anomalous behavior of Hall-Petch relation toward smaller sizes of the Ti-Ni-Cu nanocrystals.
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    Hierarchical TiO2/ZnO Nanostructure as Novel Non-precious Electrocatalyst for Ethanol Electrooxidation
    Gehan M.K. Tolba, Nasser A.M. Barakat, A.M. Bastaweesy, E.A. Ashour, Wael Abdelmoez, Mohamed H. El-Newehy, Salem S. Al-Deyab, Hak Yong Kim
    J. Mater. Sci. Technol., 2015, 31 (1): 97-105.  DOI: 10.1016/j.jmst.2014.11.006
    Abstract   HTML   PDF
    Metal oxides have a higher chemical stability in comparison to metals, so they can be utilized as electrocatalysts if the activity could be enhanced. Besides the composition, the morphology of the nanostructures has a considerable impact on the electrocatalytic activity. In this work, zinc oxide nano branches-attached titanium dioxide nanofibers were investigated as an economic and stable catalyst for ethanol electrooxidation in the alkaline media. The introduced material has been synthesized by electrospinning process followed by hydrothermal technique. Briefly, electrospinning of colloidal solution consisting of titanium isopropoxide, poly(vinyl acetate) and zinc nanoparticles was performed to produce nanofibers embedding solid nanoparticles. In order to produce TiO2 nanofibers containing ZnO nanoparticles, the obtained electrospun nanofiber mats were calcined in air at 600 °C. The formed ZnO nanoparticles were exploited as seeds to outgrow ZnO branches around the TiO2 nanofibers using the hydrothermal technique at sub-critical water conditions in the presence of zinc nitrate and bis-hexamethylene triamine. The morphology of the final product, as well as the electrochemical measurements indicated that zinc nanoparticles content in the original electrospun nanofibers has a significant influence on the electrocatalytic activity as the best performance was observed with the nanofibers synthesized from electrospun solution containing 0.1 g Zn, and the corresponding current density was 37 mA/cm2. Overall, this study paves a way to titanium dioxide to be exploited to synthesize effective and stable metal oxide-based electrocatalysts.
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    Synthesis of Single-Crystalline Anatase TiO2 Nanorods With High-Performance Dye-Sensitized Solar Cells
    Jin Liu, Jun Luo, Weiguang Yang, Yali Wang, Linyan Zhu, Yueyang Xu, Ying Tang, Yajing Hu, Chen Wang, Yigang Chen, Weimin Shi
    J. Mater. Sci. Technol., 2015, 31 (1): 106-109.  DOI: 10.1016/j.jmst.2014.07.015
    Abstract   HTML   PDF
    Single-crystalline anatase TiO2 nanorods have been prepared by solvothermal method using tetrabutylammonium hydroxide (TBAH) as a morphology controlling agent. The obtained TiO2 nanorods are dominated by a large percentage of {010} facets. The power conversion efficiency of dye-sensitized solar cell (DSSC) based on anatase TiO2 nanorods (8.66%) exhibits a significant improvement (35%) compared to that of P25 TiO2 (5.66%). The high performance of the anatase TiO2 nanorods solar cell is ascribed to their large percent of exposed {010} facets as well as balancing their surface areas and sizes.
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    Effects of In-situ Generated Coinage Nanometals on Crystallization and Microstructure of Fluorophlogopite Mica Containing Glass?Ceramics
    Mrinmoy Garai, Nibedita Sasmal, Atiar Rahaman Molla, Anal Tarafder, Basudeb Karmakar
    J. Mater. Sci. Technol., 2015, 31 (1): 110-119.  DOI: 10.1016/j.jmst.2014.11.012
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    The effects of in-situ generated coinage nanometals (Cu, Ag and Au) on crystallization behavior, microstructure, thermal and mechanical properties of SiO2-MgO-Al2O3-B2O3-K2O-MgF2 (BMAPS) glass?ceramics were systematically studied. On addition of coinage nanometal, the glass transition temperature (Tg) is increased by 20-30 °C, crystallization temperature (Tc) by 30-50 °C and dilatometric softening temperature (Td) by 10-25 °C. It was found that the density of Cu-containing glass was 2.59 g cm-3 and for other glasses it was in the range of 2.56-2.57 g cm-3. From the non-isothermal differential scanning calorimetry study, the activation energy of crystallization for BMAPS base glass was calculated as 344 kJ/mol, and changed to 406, 334 and 274 kJ/mol on addition of Cu, Ag and Au-nanometals, respectively. Crystals evolved in the opaque BMAPS glass?ceramics derived by controlled heat treatment, were identified as fluorophlogopite mica (KMg3(AlSi3O10)F2) by X-ray diffraction (XRD) technique and confirmed by Fourier transformed infrared spectroscopy. Presences of copper, silver and gold nanometals were also identified by XRD technique. It is found from field emission scanning electron microscopy that the interlocked grain like microstructure developed in BMAPS glass?ceramics (being heat-treated at 1050 °C for 4 h) changed to denser house-of-cards like microstructure (containing smaller sized mica crystals) on addition of coinage nanometals. Density of BMAPS base glass?ceramic was 2.60 g cm-3 and marginally changed to 2.61-2.62 g cm-3 on addition of Cu, Ag and Au-nanometals. The change in microstructure resulted in the decrease of Vickers micro hardness value from 5.37 to 4.12, 4.20 and 4.58 GPa on addition of Cu, Ag and Au, respectively. Coinage nanometal doped mica glass?ceramics containing interlocked microstructure with higher thermal expansion coefficient, hence, is suitable for high temperature sealing application (like solid oxide fuel cell).
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    Synthesis of Non-oxide Porous Ceramics Using Random Copolymers as Precursors
    Xiaoqian Wang, Kewei Wang, Jie Kong, Yiguang Wang, Linan An
    J. Mater. Sci. Technol., 2015, 31 (1): 120-124.  DOI: 10.1016/j.jmst.2014.04.008
    Abstract   HTML   PDF
    In this paper, we reported a novel method for synthesis of non-oxide porous ceramics by using random copolymers as precursors. A silazane oligomer and styrene monomer were used as starting materials, which were copolymerized at 120 °C to form random polysilazane-polystyrene copolymers. The copolymers were then pyrolyzed at 500 °C to obtain porous ceramics by completely decomposing polystyrene (PS) and converting polysilazane (PSZ) into non-oxide Si-C-N ceramics. The obtained material contained a bi-model pore-structure consisting of both micro-sized and nano-sized pores with very high surface area of more than 500 m2/g. We also demonstrated that the pore structure and surface area of the materials can be tailored by changing the ratio of the two blocks. Current results suggest a promising simple method for making multi-scaled porous non-oxide materials.
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    Electrically Conductive Honeycomb Monolith of Nanolaminated Ti3AlC2: Preparation and Characterization
    X.M. Fang, X.H. Wang, H. Zhang, Y.C. Zhou
    J. Mater. Sci. Technol., 2015, 31 (1): 125-128.  DOI: 10.1016/j.jmst.2014.04.004
    Abstract   HTML   PDF
    Nanolaminated Ti3AlC2 honeycomb monolith with parallel and uniform holes has been prepared through a facile extrusion route by using Ti3AlC2 powder as the main raw material. The fabricated honeycomb monolith has high compressive strength of 133 ± 11 and 59 ± 9 MPa, along and perpendicular to the extrusion direction, respectively. It also has good electrical conductivity, and excellent match of thermal expansion coefficient with the washcoat material of γ-Al2O3. These combined properties endow the honeycomb monolith a promising candidate as catalysis substrate for cleaning vehicle exhaust.
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