bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis, Characterization and Properties of PANI/(La-Nd Doped BaFe12O19) Composites
Authors: Wang Yan , Wang Jun , Zhang Xiao Fei , Liu Ya Qing
Published: January 2017

La-Nd co-doped barium hexaferrites, Ba0.7(LamNdn)0.3Fe12O19 (D-BaM), were successfully prepared by sol-gel method. PANI / D-BaM composites were synthesized by in-situ polymerization in solution. The structure, morphology and properties of samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), four-probe conductivity tester and vector network analyzer. The XRD patterns showed that the crystal structure of all the samples exist as M-type phases. The SEM images revealed that the particles presented a hexagonal platelet-like morphology. The magnetic properties could be improved by substitutions of La and Nd ions. The saturation magnetization (Ms) and coercive force (Hc) increased with the change of La / Nd ratio to the maximum at La / Nd = 3:1. The doped particles have also been embedded in conductive PANI to prepare electromagnetic materials, and the conductivity kept on the order of 10-2. The microwave absorbing properties of composites at 30 MHz-6 GHz improved obviously, the peak value of reflection loss could reach-7.5 dB.
Fabrication and Characterization of SiO2/TiO2 Nano-Hybrid Particles
Authors: Qu Xiao Fei , Xie Dan Dan , Wang Yu Fei , Wang Kai
Published: January 2017

SiO2/TiO2 nano-hybrid particles were successfully prepared by hydrothermal method by using titanium tetrafluoride (TiF4) as the titanium source, silicon dioxide as template. The factors of hydrothermal temperature and hydrothermal time on the morphologies and photocatalytic activity of SiO2/TiO2 nano-spheres were systematically discussed in this paper. The structures and properties of the SiO2/TiO2 nano-hybrid particles were studied by some techniques such as SEM, TEM, XRD and BET analysis. The results indicated that TiO2 prepared by hydrothermal method were anatase crystal, and in the form of polycrystalline. The formation mechanism of SiO2/TiO2 nano-hybrid particles was also discussed.
An Efficient Method to Form TiO2/CdS Nanotube Arrays Using Anodic Aluminum Oxide (AAO) Templates
Authors: Qu Xiao Fei , Yuan Jing Jun , Deng Xi Da , Hou Yu Chen , Wang Yu Fei , Song Hong Bing
Published: January 2017

In this paper, a simple, efficient and environmental friendly method was proposed to fabricate TiO2/CdS nanotube arrays. The composite nanotubes with a core-shell coaxial structure were fabricated via a simple method of liquid deposition and double diffusion using anodic aluminum oxide (AAO) templates. The photocatalytic properties of the nanotube arrays (TiO2, TiO2/CdS) were confirmed by the degradation of methyl orange (MO) under UV irradiation. Compared to bare TiO2 nanotube arrays, TiO2/CdS composite nanotube arrays showed improved photocatalytic performance: The degradation efficiency of TiO2/CdS and TiO2 nanotube arrays towards methyl orange was 65% and 39%, respectively.
Convenient Route to Cu-Ag Bimetallic Nanoleaflets with High Content of Cu and their Electrochemical Properties
Authors: Wang Zi Run , Liu Xin , Xie Gui Qi , Wu Yi , Nie Ming , Lin Hua , Li Qing
Published: January 2017

Cu-Ag alloy nanoparticles were synthesized by a liquid phase reduction method. Using sodium formaldehyde sulfoxylate (SFS) as reducing agents, copper-silver bimetallic nanoleaflets with high content of Cu were prepared. The obtained Cu-Ag bimetallic nanocrystal were characterized by powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), field emission scanning electron microscope (FESEM), high resolution transmission electron microscopy (HRTEM) and transmission electron microscopy (TEM). Different molar ratio of Cu-Ag bimetallic nanomaterials could produce different morphologies. The surfactant β-CD plays a crucial role on the structure of the products. The different molar ratios of Cu-Ag were also investigated. The electrochemical activity was evaluated using cyclic voltammetry (CV), electrochemical hydrogen evolution reaction (HER) in a 0.5M Na2SO4 electrolyte.
Effects of Na-Doping on Structure and Magnetic Properties of LaCoO3
Authors: Shen Yi Hao , Yao Qing Rong , Yang Peng Cheng , Deng Jian Qiu , Wang Zong Min
Published: January 2017

Effect of Na doping on the structural and magnetic properties of La1-xNaxCoO3 (0≤x≤0.4) nanopowder samples synthesized by sol-gel method have been investigated. Rietveld crystal structure refinement of the X-ray diffraction data shows that La1−xNaxCoO3 (x≤0.3) crystallizes in the rhombohedral structure with space group . The lattice parameters decrease and the crystallite sizes increase with the increase of x. For the sample with x=0.4, a secondary hexagonal phase NaCo2O4 was observed. The zero field cooling (ZFC) and field cooling (FC) curve of the samples (x≤0.3) exhibit a paramagnetic-ferromagnetic transition with decreasing temperature.
Spin Diffusion in the Finite Magnetic Heterojunction
Authors: Mi Yi Lin
Published: January 2017

Spin diffusion in the finite magnetic heterojunction was explored considering the spin dependent conductivity. In organic semiconductor spintronic devices, the up-spin and down-spin polarons have different density once spin injection happens from ferromagnetic electrodes into organic semiconductors. The difference results in the spin dependent conductivity. The calculations show that the spin injection efficiency is dependent on the spin dependent conductivity and the size of the layers. The spin dependent conductivity has great influence on the spin injection efficiency in the finite magnetic heterojunction, when the spin polarization of the organic semiconductors is moderate.
Spin Filter and Negative Differential Resistance in Carbon-Based Device with Defects
Authors: Gong Zhao Hui , Xia Tong Sheng , Wang Ya Xin
Published: January 2017

In this work, we report the electronic transport properties of an atomic carbon chain sandwiched between two ferromagnetic zigzag graphene nanoribbon electrodes with symmetrical nitrogen-vacancy defects using the density functional theory combining with the non-equilibrium Green’s function method. Our results show that a perfect spin filter is observed with almost 100% spin polarization. Moreover, we also see the negative differential resistance effect from the spin-up current under a low positive voltage bias. These results may promise potential applications in spintronic devices with multi-function in the future.
Thermal Properties of Carbon Fiber Reinforced Mullite Composites Derived from Sol-Gel
Authors: Zeng Kuan Hong , Li Zhong Quan , Liang Song Lin , Lv Xiao , Ma Qing Song
Published: January 2017

Mullite matrix composites with laminated and stitched carbon fiber cloth preform as reinforcement were fabricated via the route of “infiltration-drying-heat treatment” using Al2O3-SiO2 sol as raw materials. Thermal properties from room temperature to 1673K of the composites were investigated. The coefficient of thermal expansion (CTE) increases first and then decreases, and reaches a maximum of 4.83×10-6K-1 at 1273K. As a result of the further sintering of matrix, the CTE is negative at above 1300°C. The specific heat capacity increases to the maximum of 1.547J·g-1·K-1 at 1473K and remains stable at above 1473K, with a minimum of 0.756J·g-1·K-1 at room temperature. The thermal diffusivity decreases from 1.1mm2·s-1 at room temperature to 0.707 mm2·s-1 at 973K as the temperature was elevated, and remains stable at above 973K. On the contrary, the thermal conductivity is improved with increasing temperature on the whole and varies from 1.859W·m-1·K-1 at room temperature to 2.325W·m-1·K-1 at 1473K.
Effect of Printing Temperature on Mechanical Properties and Surface Quality of Photosensitive Resin Rapid Prototyping Parts
Authors: Zhu Xian Yong , Cui Fei Fei , Jiang Cheng , Geng Dong Ni , Xu Xue Lei , Zhou Yun Chao
Published: January 2017

Abstract. The rapid prototypes of different printing temperature by Objet30 Stratasys Pro printer were found a certain difference in performance in the process of using the process.In order to studied the effect of printing temperature on the rapid prototyping of photosensitive resin, tensile and bending tests were carried out on the rapid prototyping parts at 12°C, 18°C, 21°C, 23°C, 25°C, 30°C,respectively,and the rigidity and surface roughness of rapid prototyping parts were measured.Research shows：the tensile strength increases with the increase of printing temperature , tensile elastic modulus fluctuates with the printing temperature , they all increases rapidly after 25°C;The bending strength increases proportional with the increase of printing temperature, and the bending modulus increases first and then tends to decrease with the increase of printing temperature;The hardness value increases slowly with the increase of printing temperature, and increases obviously after 20°C,the hardness value in the middle of the prototype parts is bigger than the edge parts；The surface roughness with increasing printing temperature, although it is floating up and down, but have little effect.
Pronounced Visible Light Photocatalytic Activity Obtained from Coupling of TiO2 with Metal Organic Macromolecule
Authors: Wei Zhi Dong , Wang Rui
Published: January 2017

In this work, a new catalyst TiO2@MOM has been successfully synthesized by coupling TiO2 with metal organic macromolecule (MOM) through hydrothermal-solvothermal two-step process. Having a high visible photocatalytic activity considerably superior to that of single TiO2, the fabrication of TiO2@MOM should provide a new way of upgrading the TiO2–based catalyst.
Effect of Aging on the Creep Properties and Microstructural Evolution of P92 Steel
Authors: He Yin Sheng , Chang Jung Chel , Lee Jeh Yun , Shin Kee Sam
Published: January 2017

The P92 steels were aged at 632°C for 500hrs and 1,000hrs, and creep ruptured at 650°C~625°C with stress of 120~110 MPa. The creep rupture life (CRL) of the aged samples was decreased with the aged time. The microstructure of the P92 steel was observed as fine tempered lath with dispersion of Cr-rich M23C6 along various grain boundaries. Upon aging and creep, recovery of lath and precipitation of coarse W-rich Laves phase were characterized as the main microstructural change. The M23C6 is relatively stable upon the short-term aging and creep. Decrease of the CRL of the aged specimens is considered as the degradations of microstructure such as the recovery of lath due to the dislocation annihilation and precipitation of coarse Laves phase.
Ultrasonic Effect on Fabrication of Intercalated MgAl-LDH/PVA Nanocomposites via Exfoliation-Adsorption Route
Authors: Li Bao Guang , Xu Yong Zi , Bai Lu , Dai Huan , Xie Cai Cai , Li Hai Bin
Published: January 2017

Glycine intercalated Mg/Al-layered double hydroxides (LDH-G)/PVA nanocomposites were prepared via exfoliation-adsorption route based on exfoliation of LDH-G in formamide. The effect of ultrasonic treatment on the fabrication of LDH-G/PVA nanocomposites was investigated. The results of XRD suggest that chains of PVA with double layer arrange into the galleries of restacking LDH platelets with the formation of intercalated-type nanocomposite. Experiments present that ultrasonic treatment on the colloid of LDH-G/PVA increases the amount of platelet which forms the intercalated phase, and improves the regularity of LDH-G arrays in the c direction. It is demonstrated the exfoliated LDH platelets orient in its normal paralleling the flow direction at the high shear rate induced by ultrasound. Simultaneously, under the enhanced temperature caused by long term of ultrasonic treatment, PVA chains extend more and the interaction between PVA chains and LDH layers is reinforced. A model was proposed for various stages of LDH platelets and PVA chains in their mixed colloid during ultrasonic treatment which describes the fabrication of improved hybrid structure.
A Technology of Composite Reinforced Infiltration
Authors: Diao Jia Jiu
Published: January 2017

A series of advantages for resin matrix composites make it get extensive application in PCB Field. However, because the properties of composites depend on process crafts badly,unreasonable processing technology will lead forming difficult, and then redesign is needed. This affects production efficiency badly in PCB enterprise. According that composites forming process is huge and complicated, in order to evaluate whether it is rensonable on produce process. This paper try to discuss the technical method of improving the wettability of the composite material from the angle of the production process by increasing the infiltration area, gradually exhaust, increasing the total amount of the base material, pressure infiltration velocity difference and improve the shortcomings in the material production process review. This paper validates the methods useful and practical. It can get a better production effect of infiltration by increasing infiltration area, step by step exhaust, increasing the total matrix materials, speed difference infiltration, pressure type wait for infiltration. The rapid infiltration production technology not only improves the performance of composite materials, but also has important significance to improve the interfacial properties of the composites.
Thermally Conductive Nanocomposites Based on Epoxy Modified with SiC and POSS
Authors: Fu Ji Fang , Lu Qi , Zong Pei Song , Chen Li Ya , Ding Guo Jun , Dong Xing , Yu Wen Qi , Shi Li Yi
Published: January 2017

OAPS/SiC/EP, SiC/EP, A151-SiC/EP composites were prepared and their impact properties, flexural properties, thermal conductivity and insulation and thermal stability were investigated. The comparison of three different composites showed that OAPS/SiC/EP composites had best properties. The thermal conductivity of OAPS/SiC/EP composites increased with increasing filler content. The thermal conductivity of OAPS/SiC/EP composites with 20 wt% SiC was 0.34 W/mK and was 55% higher than that of unmodified EP.
Morphology Control and Photoluminescent Properties of Bundled ZnO Nanorods Array Based on Silicon Nanoporous Pillar Array
Authors: Wang Ling Li , Feng Shi Quan , Wang Hai Yan
Published: January 2017

A silicon nanoporous pillar array (Si-NPA) is a silicon hierarchical structure with regularly patterned surface morphology. An array of bundled ZnO nanorods was grown based on Si-NPA by a catalyst-free thermal evaporation method. The morphology of ZnO/Si-NPA was found to be greatly affected by the growth parameters such as the grown temperature and the ratio nitrogen and oxygen. The room-temperature photoluminescence (PL) spectrum of ZnO/Si-NPA showed a violet emission at ∼410 nm and a blue-green emission around 500 nm, which were attributed to the PL of Si-NPA substrate and oxygen vacancies of ZnO, respectively. The results indicated that ZnO/Si-NPA is a promising optical material.
Synthesis and Luminescence Properties of a Blue-Emitting Sr3NaLu(PO4)3F:Eu2+ Phosphor
Authors: Yang Zai Fa , Xu Deng Hui , Gao Xue Dong , Du Jiang Nan , Sun Jia Yue
Published: January 2017

A novel blue-emitting Sr3NaLu (PO4)3F:Eu2+ phosphor for white light-emitting diodes (w-LEDs) have been successfully prepared via the solid-state reaction. The crystal structure and phase of the prepared phosphors were investigated using X-ray diffraction (XRD). The band gap of Sr3NaLu (PO4)3F was estimated to be about 5.79 eV from the diffuse reflection spectrum. The Sr3NaLu (PO4)3F:0.05Eu2+ phosphor exhibits an intense and broad excitation band ranging from 200 to 450 nm in the near ultraviolet region and produces a bright blue emission band with the CIE chromaticity coordinates of x = 0.133 and y = 0.148 under the excitation of 365 nm, which were ascribed to the 4f-5d transitions of Eu2+. Moreover, the fluorescence decay curves were also investigated in detail. All the results suggest that Sr3NaLu (PO4)3F:Eu2+ might be a promising blue-emitting phosphor used in w-LEDs.
Current Development of Key Materials for Low Temperature Fuel Cells
Authors: Zhang Jun , Zhu Ying Li , Qi Gang , Li Jian Yu
Published: January 2017

Low temperature fuel cells are promising environment-friendly energy conversion systems with high energy density and efficiency to be used as components of electronic devices for stationary and portable applications. In this paper, the key materials of the three types low temperature fuel cells are introduced, and the most recent advances related to the key materials and their character are reviewed. The current status of materials for electrolyte, catalyst and electrode materials is focused on.
NiMn2O4 Nanosheet Arrays with Controlled Mass Loading as Pseudocapacitor Electrodes
Authors: Xiang Lu , Shen Jun , Lv Lu Qiang , Li Xu , Liu Shuang Yi , Li Zhen Hu
Published: January 2017

Nanostructured binary transition metal oxides are expected to possess better pseudocapacitive performance than that of mono-metal oxides. Herein, NiMn2O4 nanosheet arrays are grown on the Ni foam successfully with using the facile hydrothermal method and post-annealing. The surface morphology, composition and structure of as-synthesized products are investigated by Field emission scanning electron microscope, energy-dispersive X-ray spectroscopy and X-ray diffraction. The electrochemical performance is evaluated by cyclic voltammetry and galvanostatic charge-discharge tests. The results show that the thickness of nanosheets varied from 7 nm to 25 nm with changing the reaction temperature from 40 to 220 oC, the density of nanosheets are also present the increasing trend, and through which the mass loading of as-synthesized nanostructurs is controlled. The NiMn2O4 electrodes fabricated at higher reactiontemperature exhibit better electrochemical performance due to the raising mass loading of active electrode materials with the temperature. Moreover, the electrodes achieved at 220 oC offer a highest specific capacitance of 177.2 mF/cm2 at scan rate of 2 mV/s and good cycling stability with 89 % initial capacitance retention after 5000 cycles at a current density of 10 mA/cm2 in 1 M Na2SO4 electrolyte.
Study of Pore Modality of Irradiated UO2 Fuel Assembly
Authors: Peng Yan Hua , Wang Fei , Zhu Wei , Jiang Yan , Tang Hong Kui , Wen Bang , Li Guo Yun , Huang Juan
Published: January 2017

UO2 fuel pellets may be swelling and recrystallization during irradiation. Density, dimension and distribution of pores are main factors to induce irradiation swelling, especially the size distribution of pellet pores plays an important role. 4×4-4 fuel assembly was a high performance fuel assembly which was self-designed and manufactured, the average burn-up of the fuel assembly was 42GWd/tU.For studying the effect of irradiation on pore modality, the specimens of irradiated UO2 fuel pellets were taken from 4×4-4 fuel assembly after dismantling, microscopic structure and distribution of pores for UO2 fuel assembly by scanning electron microscopy were studied in this paper. The results showed that there were many cracks in fuel pellets, most micro-cracks were transgranular crack. The release rate of fission gas with burn up were augmentation, which was consistent with the porosity of diversity burp up fuel rod. Pores were distributed non-uniformly in irradiated fuel pellets, gathered at local area and more obvious connectivity of pores. The size of pores after the irradiation was between 0.2~1.2 μm, and mostly distributed at 0.3μm ~0.6 μm; The pores at grain boundary of two adjacent grains was less, the pores at grain boundary were distributed by the way of triangle or quadrilateral. The size of pores was increased than pre-irradiation, but ratio of pores and density of pores were decreased obviously, the phenomenon of irradiation densification was occurred in fuel pellets after irradiated. Recrystallization and Rim structure effect were not found.
Preparation and Electrochemical Properties of LaMnO3 Powder as a Supercapacitor Electrode Material
Authors: Wang Xian Wei , Wang Xiao Er , Zhang Hui Chao , Zhu Qian Qian , Zheng Dong Li , Sun Ling Yun
Published: January 2017

The structural and electrochemical properties of lanthanum manganate (LaMnO3) powder prepared by the sol-gel method are researched in this article. The powder calcined at 600 °C showed amorphous, and the powder calcined at 700-800 °C showed the pure phase of the LaMnO3. The grains with the size of about 80-120 nm were agglomerating together. Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical properties in alkaline environment. The electrochemical properties calcined at 700 °C showed a specific capacitance of 73 F/g at the current density of 0.5 A/g. The raw materials for preparing the LaMnO3 powder are cheap, and the operation method is simple.
Porous Carbon Derived from Metal-Organic Framework as an Anode for Lithium-Ion Batteries with Improved Performance
Authors: Luo Yu Mei , Sun Li Xian , Xu Fen , Wang Zi Qiang
Published: January 2017

A facile two-step method for preparation of porous carbon materials was reported. We used a novel Co-MOF, made by cobalt nitrate and two organic ligands (9-ethylcarbazole-3,6-dicarboxylic acid and 1,3,5-Benzenetricarboxylic acid), as the template to synthesize the porous carbon through high temperature carbonization, which was applied as an anode material for lithium-ion batteries. A reversible capacity was maintained as high as 549 mA h g-1 after 49 cycles at a current density of 100 mA g-1, with coulombic efficiency of over 95%. The prepared porous carbon electrode also exhibited superior cycle stability and rate performance, making it a promising anode material for lithium-ion batteries.
SnO2 Nanoparticles for Lithium-Ion Batteries Prepared by Sol-Gel Method
Authors: Liu Xu Yan , Han Yan Lin , Li Qiang , Pan Deng
Published: January 2017

Nanostructured SnO2 is an attractive anode material for high-energy-density lithium-ion batteries because of the fourfold higher theoretical charge capacity than commercially used graphite. However, the poor capacity retention at high rates and long-term cycling have intrinsically limited applications of nanostructured SnO2 anodes due to large polarization and ~300% volume change upon lithium insertion/extraction. Here we report the design of SnO2 nanoparticles, which are synthesized by sol-gel method, with an aim at overcome the above problems for the high-performance reversible lithium storage. The results showed that the mean sizes of SnO2 particles treated with 6 wt.% ammonia were less than 30 nm, which can store charge with a capacity density as high as ~1888 mAh/g. Even when the discharge rate was increased to 0.5 C, it still retained ~1017 mAh/g.
Study on Al-BiCl3-Hydride Composites Hydrogen Generation Materials
Authors: Shao Yu Long , Sun Li Xian , Xu Fen , Zou Yong Jin , Chu Hai Liang
Published: January 2017

Hydride has been introduced into Al-BiCl3 composite by ball milling. The hydrogen generation performances of Al-BiCl3-hydride composite have been effectively promoted. Among of them, Al-BiCl3-Li3AlH6 is found to have the best performance of hydrogen yield (1293 mL·g-1), the conversion efficiency (94.4%) and the max HG rate (2098 mL·g-1·min-1) at 25 oC. Due to Li3AlH6 need to be prepared, the increasing production process is inevitable. For the Al-BiCl3-LiBH4 composite, its hydrogen generation performances are measured which hydrogen yield, the conversion efficiency and the max HG rate of were 1103 mL·g-1, 84.2% and 2068 mL·g-1·min-1, respectively at 25 oC. Activation energy (Ea) is calculated as 13.39 kJ·mol-1. The lower Ea indicates that introducing hydride can enhance the reaction activity of the system on the kinetics and then improve the material properties.
Synthesis and Evaluation of a New Kind of Kinetic Hydrate Inhibitor
Authors: Yan Ke Le , Zhang Hong Xing , Li Ying , Zou Bing , Xiao An Shan , Ma Ming
Published: January 2017

A new kind of kinetic hydrate inhibitor (KHI) named KL-1 as the ramification of poly (N-vinyl caprolactam) (PVCap), was synthesized successfully by use of precipitation polymerization. The hydrate inhibition performance of KL-1 was assessed in a high pressure sapphire cell, and the onset time of hydrate formation and maximum subcooling were determined by the visual observation method and compared with the commercial KHIs, including Inhibex 501 and VC-713. Meanwhile, the synergic effect between ethanol and KL-1 developed was also studied in this work. The experimental results show that the onset time of KL-1 measured increases with the increase of the dosage and decrease of subcooling. Compared with the system without kinetic hydrate inhibitor, the morphological behavior of hydrate crystals in the systems containing KL-1 is different, and the hydrate crystals only grow to the gas phase with the hydrate formation. Additionally, based on the measurement of inhibition time, the inhibition performance of KL-1 is superior to Inhibex 501 and VC-713, and shows higher maximum subcooling at the similar conditions. Finally, we also demonstrated that ethanol can be used as synergist to improve the performance of KL-1 remarkably at suitable dosage.
Network Connectivity in Icosahedra Medium-Range Order of Metallic Mg70Zn30 Alloy
Authors: Zhou Li Li , Zhong Zheng
Published: January 2017

The molecular dynamics simulations with embedded atom model (EAM) potential had performed to investigate the icosahedral network connectivity in Mg70Zn30 alloy. The microstructure was detected with a new precise method of largest standard cluster analysis. It was validated that the EAM potential is succeed in reflecting the objective physical nature of Mg-Zn alloy systems. Results shows that large amount of nanoclusters consist of ICOIs, which shows large connectivity variations, formed in the system with decreasing temperature. And the ICOIs connect over extended range act as backbone for a networked structure.
Self-Toughness Porous Sodium Titanate Bioceramics Prepared via In Situ Grown Na2Ti6O13 Rods
Authors: Ma Xiao Wei , Shen Jian Xing , Zhang Ke Chang , Kong Ling Kai , Sun Jia Le , Zhang Jia Yan
Published: January 2017

Here in, we report the porous bioceramic with Na2Ti6O13 rods prepared by in‒situ growth method. The samples were prepared using cold uniaxial pressing (40 MPa) technique and further sintered at different temperatures. The structure and morphology were characterized by XRD and SEM. The porosity, compressive strength and fracture toughness were also investigated. The bone-like apatite deposition ability of the fabricated ceramic samples was evaluated by Kokubo simulated body fluid (SBF) soaking method. The results indicated that the Na2Ti6O13 rods with about 1‒3 μm in diameter are uniformly distributed in the self‒toughness porous sodium titanate ceramics (SPSTC). The SPSTC with a porosity of 61.10±1.12 % exhibits good compressive strength (43.36±2.43 MPa) and fracture toughness (3.47±0.21 MPa·m1/2). The results indicate that the novel SPSTC scaffolds are promising for bone tissue engineering applications.
Preparation of PMMA/Nano-Cu Antibacterial Plastic by In Situ Polymerization
Authors: Chen Xiao , Lei Hua , Xu Tao , Zhang Jie , Qiu Yu , Tan Lu
Published: January 2017

PMMA/nanoCu antibacterial plastic was prepared by in situ polymerization using MMA as monomer, BPO as initiator and surface treated nanoCu as antibacterial agent. AMEO was used for surface treatment of nanoCu. ATR-FTIR spectra showed that AMEO successfully reacted on the surface of nanoCu. SEM spectra showed that nanoCu dispersed evenly in the PMMA/nanoCu composite. Antibacterial test results showed that the composite had a strong antibacterial effect on Escherichia coli, and the antibacterial rate reached more than 99%. Therefore, the PMMA/nanoCu composite can be used in various fields of antibacterial plastic products.
Fabrication and Water Treatment Application of High Efficient PbO2 Electrode
Authors: Li Yi Nan , Zhuang Xin Yu , Li Hong Yu , Ai Li Mei , Wang Yi Hu , Wang Qian , Chen Hui Ying , Xia Jian Xin , Xing Xuan
Published: January 2017

A novel and high efficient PbO2 electrode has been fabricated in the present study for refractory wastewater treatment. The traditional Ti plate is made into honeycomb by electronic corrosion to be used as electrode basement. The novel surface topography improves the specific surface area of the electrode material and enhances the adhesion of surface coating. SnO2-Sb layer is deposited between basement and PbO2 layer which reduces the thermal stress and improve electrode life. Rare earth element La is doping into PbO2 layer to improve the lattice structure and the catalytic performance. Finally, F ion is adding into the catalytic layer to improve the smoothness of the material surface. Characterized by SEM and XRD, results showed that the electrode prepared has novel surface morphology. Pollutants degradation results and electrode life test showed that the PbO2 electrode investigated in the present study has great advantage compared with traditional electrodes and has good application prospect.
Problems and Prospects of Water-Supply by Ultrafiltration
Authors: Wang Hai Chao , Lei Xiao Ling
Published: January 2017

General problems and prospects for water-supply using ultrafiltration technology are considered. The limits for application of this technology are indicated. The industrial water ultrafiltration plants appeared in the end of the XX century. Later in 2006 year the biggest in Europe plant purifying 250,000 m^3 of water per day by ultrafiltration was put into operation in Moscow. World experience shows that in large-scale station for purifying water the technology using combination of traditional methods with ozone treatment and sorption, and then membrane ultrafiltration is very useful.
Study on Photocatalytic Reduction of Cr(VI) by Fluorine-Doped TiO2
Authors: Wang Shu Qin , Bi Bo , Zhao Xue Juan
Published: January 2017

To enhance the photocatalytic performance of nanoTiO2 on Cr (VI) reduction, we have prepared fluorine-doped TiO2 photocatalyst (named as F-TiO2 hereinafter) via sol-gel method. N-doped TiO2 (N-TiO2) was also prepared for comparison. XRD, BET and UV-vis DRS were used to characterize and analyze these samples. The photocatalytic activity of different photocatalysts was evaluated by Cr (VI) reduction experiments. Effects of preparation conditions, reaction kinetics and catalyst lifetime were discussed in this paper. The experimental results showed that the best preparation conditions were as follows: ammonium fluoride used as F source, F/Ti=0.1, calcination temperature=500°C and calcination time=3h. The photocatalytic reduction process conformed the first-order kinetics, and the reaction rate constant of F-TiO2 was 4 times as large as that of virgin TiO2. Characterizations also proved that F doping improved the photocatalytic activity of TiO2.
Effects of Sm and Zr Addition on the Microstructure and Mechanical Properties in Mg-Cu Alloys
Authors: Xu Zhi Chao , Feng Zhong Xue , Dong Jia Liang
Published: January 2017

The effects of Sm and Zr amount on the properties of Mg-Cu-Sm-Zr alloys were systematically investigated. The results showed that the Mg99Cu alloy consist of-Mg matrix and Mg2Cu phase. After the addition of Sm and Zr, it was confirmed that Sm and Zr change the structure and distribution of Mg2Cu phase. In the meantime, the CuZr2 and CuSm phases which make a major contribution to mechanical properties were observed in the Mg-Cu-Sm-Zr alloys. The addition of Sm and Zr can also greatly refine the grains. The strength continuously increased due to the increase of Sm and Zr content. The elongation first increased within the range of 0-1.5%Sm 0-0.9%Zr, and the decreased. The alloys with 0.5wt%Sm and 1.9wt%Zr had the best combination of mechanical properties.
Preparation and Oxidation Properties of Carbon/Carbon Composites with the Antioxidant SiC/NiCS Coating
Authors: Li Yi , Zeng Fan Hao , Liu Ji An , Zou Zhi Huan , Gu Yi
Published: January 2017

In the paper, the SiC/NiCS coating on carbon/carbon composites was designed and prepared, and its oxidation properties was investigated. The SiC transition layer is prepared by embedding method while the NiCS coating by brushing slurry. Oxidation resistance of various coatings and the same coating sintered by different ways are analyzed through the isothermal oxidation experiment. The strength retention of the samples after oxidation is tested through the three-point bending experiment. The surface and cross section morphology of the coating before and after oxidation are observed by SEM, and crystalline phases of the coating are analyzed by XRD. According to the results, the coating have excellent short-time oxidation resistance, and the weightless rate with oxidation time presents linear increasing trend basically. With the increase of temperature, the weight-loss rate increases. The more serious oxidation is, the lower bending strength retention rate is. The integrity and density of the barrier layer and the across-running cracks of the silicon carbide transition layer are the main factors influencing the oxidation resistance of the sample.
Plasma-Enhanced Atomic Layer Deposition of GaN Thin Film at Low Temperature
Authors: Tang Wen Hui , Jia Yi , Zhang Bo Cheng , Yang Chang Wei , Qu You Zhi , Li Min , Xia Yang
Published: January 2017

Polycrystalline GaN thin films were successfully grown at low temperature (250 °C) by plasma-enhanced atomic layer deposition with NH3, N2, N2/H2 gas mixture and trimethylgallium (TMG) as precusor. The growth rate, crystal structure, surface composition and the valence state of the corresponding element of the GaN thin films using different nitrogen sources were characterized and examined systematically via the spectroscopic ellipsometry, the x-ray diffractometer, the x-ray photoel-ectron spectrometer. It is showed that all the GaN thin films using different nitrogen sources were polycrystalline structure and the preffered orientation were mainly (100). The films using N2 and N2/H2 gas mixture had a higher crystal quality than films using NH3. The GPC (growth rate per cycle) would increase with the increase of the N2 flow rate. The films using a suitable ratio of N2/H2 flow rate had not only a high GPC but a good crystal quality. The ratios of Ga/N element of the films using N2/H2 gas mixture were approximated to 1:1, it would increase with the ratio of the N2/H2 flow rate in the gas mixture, which is showing much effect of the ratios of N2/H2 flow rate on the nitrogen content of the thin films.
Effects Studying of Annealing to Mechanical Properties Carbon-Doped Ti-O Films Synthesized Using CO2 Gas
Authors: Liu Hong Wu , Su Yong Yao , Huang Xiao Yu , Xue Jian Lu , Wen Feng
Published: January 2017

Carbon-doped Ti-O films were deposited on steel and silicon wafer by DC reaction magnetron sputtering (R-MS) using CO2 as carbon and oxygen source. A series of films were prepared by means of changing the flow of CO2 or O2. The effects of annealing temperature ranging from 300 to 650°C on the properties of Ti-O films under vacuum were studied. X-ray diffraction (XRD) and field emission scanning electronic microscope (FESEM) were employed to analyze and observe structure and morphology of pre-or after-annealed Ti-O films. nanoindentation was used to measure nanohardness and modulus, and recovery was also calculated by the curves of load-displacement. Roughness and thickness were estimated by surface profiler. The XRD studies revealed that the doping of carbon was beneficial to the crystallization of the films. The results showed that the particle size of Ti-O films increased with the increase of annealing temperature, as-annealed carbon-doped Ti-O films have fair mechanical performance.
The Effects of the Carrier Concentrations on the Hall Mobilities of ZnO:Al Thin Films Deposited by Magnetron Sputtering
Authors: Wang Xiao Jing , Zhang Yun
Published: January 2017

ZnO:Al thin films were deposited on flexible substrates by magnetron sputtering. The effects of the carrier concentrations on the hall mobilities of AZO films were investigated. When the carrier concentration was high (~1020/cm3), the hall mobility decreased with increase of the carrier concentration, showing obvious characteristics of ionized impurity scattering; moreover, the carrier mobility could be expressed to be-2.14/3 proportional of the carrier concentration by combining the results of simulation and experiments.simulation and experiment. When the carrier concentration was about a magnitude of 1019 cm-3, the carrier mobility is influenced by the carrier concentration and grain size, which means the carrier mobility was affected by both the grain boundary scattering and ionized purity scattering mechanism.
Preparation of Coated ZrSiO4-ZrB2 Using Sol-Gel Method and its Oxidation Resistance
Authors: Chen Meng , Li Jun Guo , Yang Hai Tao , Shen Qiang , Zhang Lian Meng
Published: January 2017

In this paper, coated ZrSiO4-ZrB2 powder was prepared by sol-gel method. The ZrSiO4 coating can improve the oxidation resistance of ZrB2 at high temperature. The effect of N (nZrSiO4/nZrB2), sintering temperature, holding time and catalytic hydrolysis condition of tetraethoxysilane (TEOS) on coated ZrSiO4-ZrB2 powder was discussed. The modern testing techniques such as XRD, SEM and TG-DSC were used to analyze the crystal phase compositions, microstructures and the oxidation resistance property. The results of experiments showed that the oxidation resistance of coated ZrSiO4-ZrB2 powder was excellent when N is 0.7, and TEOS is alkaline-catalyzed hydrolyzed.
ZrSi2-SiC/SiC Anti-Oxidant Coatings Prepared on Graphite Spheres by Two-Step Pack Cementation Process
Authors: Zheng Zu Jie , Zhou Ping , Zhao Hong Sheng , Li Zi Qiang , Liu Xiao Xue , Zhang Kai Hong , Liu Bing
Published: January 2017

A ZrSi2-SiC/SiC double layer was fabricated on the surface of graphite spheres by two-step pack cementation with zirconium, silicon, and graphite powders as mainly raw materials. The microstructure, phase, oxidation behavior, and thermal shock resistance of the ZrSi2-SiC/SiC composite coatings were studied. The results show that the outer coating is composed of ZrSi2 and SiC and the inner coating is composed of SiC, of which the thickness is 450 μm. Isothermal oxidation test was conducted in air at 1773 K for 20 h and a weight increase of 1.69% were recorded. After 10 times of thermal shock tests between 1473 K and room temperature, the weight of the coated specimens decreased by only 1.14%. The excellent oxidation resistance is due to the production of SiO2 and ZrSiO4 in the process of the oxidation of SiC and ZrSi2, forming a glass phase that can effectively prevent further oxidation.
The Influences of Frequency on the Fabrication and Structural Studies of Micro-Arc Oxidization Ceramic Films Formed on Pure Titanium
Authors: Xu Lin , Wu Cong , Xu Xiao Jing , Li Bo Quan , Niu Xiao Ya , Huang Zhen , Ding Jian Ning
Published: January 2017

The porous oxide TiO2 ceramic film containing Ca and P is fabricated on the surface of pure titanium in the electrolyte of C4H6CaO4-NaH2PO4 by micro-arc oxidation (MAO) method. The microscopic structure, elemental composition and phase components of Ceramic Film are studied with scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), 3D profilometer and etc. Results indicate that the ceramic film on pure titanium by micro-arc oxidation is a porous mixed crystal structure which contains anatase TiO2 and rutile TiO2, and that the film is mainly composed of such elements as Ti, O, Ca and P. With frequency increasing, the number of micropores increases, the hole is decreased in diameter, porosity and roughness,and the surface is more smooth. The increase of frequencies makes the ratio of Ca/P decrease, the relative content of anatase TiO2 increase and rutile TiO2 decrease.
Application of Magnetic Ionic Liquids
Authors: He Wei Wei , Qu Guang Fei , Zhao Qian , Li Xiao Fen
Published: January 2017

Magnetic Ionic liquids are a class of functional ionic liquids with magnetic. Because of outstanding thermal stability, excellent electrochemical properties, good solubility and recyclability, it has broad application prospects in catalysis, separation extraction, material synthesis and other fields. The main applications of magnetic ionic liquids in recent years are reviewed especially in the field of magnetic separation and catalytic. It shows a huge advantage that can highly efficiently catalyze myriads of reactions, and can be recovered and reused by a magnetic field. With the further research of magnetic ionic liquids, it is believed that the magnetic ionic liquid will be applied in more fields.
Rapid Preparation of YBCO Coated Conductor by Chemical Solution Deposition
Authors: Zhu Xiao Lei , Zhang Hong , Pu Ming Hua , Zhao Yong
Published: January 2017

With Energy shortage becoming increasingly severe, the application of high-temperature superconducting material is considerable prospects. Economic, efficient and energy-saving preparation techniques become the key factors for the large-scale applications of REBa2Cu3O7-δ superconducting coated conductors. A rapid route of chemical solution deposition (CSD) has been developed to prepare YBa2Cu3O7-δ(YBCO) /SmBiO3 (SBO)/NiO/NiW coated conductor. In this process, the precursor film decomposition time is greatly reduced and the whole time of preparing SBO film is less than 2 hours. Therefore, it greatly saves the energy and reduces the cost of preparation. The subsequent YBCO layer was successfully grown on the SBO/NiO/NiW and the Tc is about 89 K and the Jc is about 1.46 MA/cm2 in self-field at 77 K. The results show that using rapid CSD preparation of YBCO/SBO/NiO/NiW is one of the effective energy-saving techniques.
Structural and Ferromagnetic Properties of Ho-Doped BiFeO3 Films
Authors: An Ning , Zhang Hai Tao , Liu Cheng Zhi , Fan Cun Bo , Dong Xue , Song Qing Li , Wen Guan Yu
Published: January 2017

In order to improve the structural and ferromagnetic property of BiFeO3, the effects of Ho3+ doping is systematically investigated. Pure BiFeO3 and Ho-doped BiFeO3 thin films are fabricated by sol-gel method, and the phase structure, morphology, crystalline structure, ferromagnetic are characterized by XRD, SEM, Raman spectra and VSM, respectively. The XRD patterns of the samples indicate that all the compounds crystallize in rhombohedral distorted perovskite structure with space group R3c and the Ho substitution can suppress the intrinsic formation of the miscellaneous phase. The SEM proves that along with the increasing of Ho concentration, the surface roughness of BiFeO3 is decreased due to the reduction of defects in the preparation. From the Raman spectroscopy, it is found that the peak intensity of 8 modes in Bi1-xHoxFeO3 are increased and the modes shift to higher wave number. Besides, the VSM results show that the ferromagnetic of the samples is enhanced with increasing of Ho concentration. When x=0.1, Ms is improved to be 4.8emu/g. The results can prove that the Ho3+ doping can reduce the volatilization of Bi3+, decrease the concentration of oxygen vacancies and improve the room-temperature ferromagnetic of BiFeO3.
Effect of Nickel Doping on Dielectric, Piezoelectric Properties and Domain Configurations of PZT Based Ceramics
Authors: Jaitanong Nittaya , Zeng Hua Rong , Li Guo Rong , Yin Qing Rui , Chaipanich Arnon
Published: January 2017

The aims of present study were investigated the effect of nickel doping on the dielectric and piezoelectric properties of P(BN)ZT solid solution. P(BN)ZT powder doped with nickel nanoparticle in the composition of (1-x) PBNZT–xNi when x = 0, 2, 4, 6, 8 and 10 percent by mole. P(BN)ZT doped with nickel powder were calcined at 900 °C for 2 h and sintered at the temperature range of 1150 -1250°C for 2 h with heating/cooling rate of 5 °C/min. The dielectric constant (er) and the dielectric loss tangent (tand) of all ceramics were measured at room temperature using LCR meter. The piezoelectric properties (d33) were measured at room temperature using d33 meter. The micro and nano-domain structure was clearly observed by piezo-response force microscopy (PFM). From the results, it can be seen that the dielectric and piezoelectric decreased with increasing Ni particle of all composition (0.0-0.1 mol%). Moreover, PFM images show that the micro (180°) and nano (90°) domain are orientated at the surface region in submicron-scale of P(BN)ZT ceramics with doped nickel nanoparticle.
Impact Strength of Filled Polymer Materials
Authors: Müller Miroslav , Valášek Petr
Published: January 2017

Polymers rank among a significant group of technical materials. One of requirements for this constructional material is to have enough resistance to a dynamic loading. Especially in the area of connecting the materials reactoplastics are used, which are distinguished for a low resistance to the dynamic loading. One solution for increasing an impact strength is filling the reactoplastics, i.e. a formation of polymer composites. The aim of the research was to evaluate an impact strength of various polymer materials (composites filled with different types of a filler, structural two-component epoxies, mixed recycled plastics, PPO – polyphenyle oxide and PS – polystyrene). The Dynstat method CSN 64 0611 was chosen for the evaluation of the impact strength. Reactoplastics matrix on the basis of two-component epoxy adhesive with high liquidity and an increased speed of a hardening GER reaches low values of the impact strength (2.54 ± 0.30 kJ·m-2). It is evident from the experimental results the positive effect of aluminium microparticles GER MFAI (3.26 ± 0.35 kJ·m-2), glass beads GR B134 (2.83 ± 0.29 kJ·m-2) and microfibres of polyamide from the process of tyre recovery GER MPA (3.92 ± 0.25 kJ·m-2) on the impact strength. The results of this experiments show the possibility of the modification of the relative fragile epoxy resin with the filler, which increases the impact strength.
Janssen’s Effect in Mechanical Behavior and Fracture of Granular Materials
Authors: Maksuwan Atirat
Published: January 2017

In 1985, H.A. Janssen studied the structure of the forces inside a silo filled with granular materials, so-called Janssen’s Effect Method (J.E.M). This method is a unique property of confined granular materials. The pressure at the bottom saturated with an increasing filling height due to internal friction with side walls. In this research, we focus on the study of granular cohesionless materials such as sands and gravels, these forces are explained by adsorption and capillary phenomenon. Our main result shows that positive water pressures generate a mechanical effect with tendencies of removing the components of the porous medium corresponding to the mechanical buoyancy force (FB) that increases with increasing θ from calculated by Janssen's effect method. The topic in this research is once importance in study physical processes of the problem in the Geology Physics (i.e. the factor causing landslide).