bluuebunny/crossref_metadata_2025 huggingface dataset:
Zn-Doped Palygorskite Loaded TiO2 for Visible-Light Active Catalysts
Authors: Zhao Di Fang , Lu Hong Dian , Tian Chan Gan
Published: May 2011

Zn-doped palygorskite loaded TiO2 for visible-light active catalysts were prepared by the method of liquid ion exchange and precipitation. XRD and SEM measurments show that the titanium dioxide was loaded on the palygorskite and that composite is mainly composed of two phase,that is, the palygorskite and the nano crystalline titanium dioxide. The results show that the composite catalysts showed excellent photocatalytic ability and quantum efficient.
Fabrication of Zn-Se/Stainless Steel Thin Films by Ultrasonic Electrochemical Deposition and its Application
Authors: Wang Qiu Fen , Huang Ying , Miao Juan , Wang Yan
Published: May 2011

Zn-Se/stainless steel thin films were prepared by ultrasonic electrochemical deposition and the application of them was discussed. Firstly, the parameters of the ultrasonic electrochemical deposition were optimized, and the morphology and component of Zn-Se thin films prepared were analyzed by SEM and EDS, it may be seen that more appropriate Zn-Se thin films were prepared by ultrasonic-electrodepositing method. Secondly, Zn-Se thin films may be applied in the aspect of treatment wastewater. Effect on treatment of Rhodamine B imitative wastewater was investigated, which ultrasonic electrodepositing method was better than traditional electrodepositing method.
Warm Flow Compaction to Form Cross-Shaped Parts with Threaded Holes
Authors: Ke Mei Yuan , Xiao Zhi Yu
Published: May 2011

The flowability of W-Ni-Fe powders was evaluated through measuring the lateral pressures at different lateral distances in warm flow compacting. Green densities at different lateral distances were also tested. In addition, cross-shaped parts with threaded holes were trial produced. The results showed that, at lateral distance of 2 mm, the lateral pressure was 101.9 MPa and the green density was 9.09 g·cm-3 when compacted under 600 MPa at 96°C. Warm flow compaction could form cross-shaped parts with lengthwise and lateral threaded holes.
Carbon Microspheres Prepared by High Internal Phase Emulsion Polymerization
Authors: Liu Ming Xian , Gan Li Hua , Hu Jun , Liu Hong Lai , Chen Long Wu
Published: May 2011

In this paper, we present a novel approach for the synthesis of carbon microspheres via the polymerization of a high internal phase emulsion (HIPE). By using Span 80 and Tween 80 as emulsifiers, 1iquid paraffin as oil phase, and the mixture of resorcinol/formaldehyde (R/F) solution as aqueous phase, an O/W emulsion was obtained. This emulsion phase inverted to a W/O HIPE induced by ammonia which served as the polymerization catalyst. Carbon microspheres (CMs) were prepared by polymerization of the HIPE, followed by drying and carbonization. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) analyzer were used to characterize as-prepared CMs. The results indicate that, in case of 0.25 wt% ammonia of the HIPE, the diameters of CMs decreased from about 2 to 1 μm when the mass fraction of aqueous R/F decreased from 0.714 to 0.357; the apparent density and the specific surface areas of the CMs, however, did not change obviously, which are about 0.6 g/cm3 and 200 m2/g, respectively. The dosage of ammonia has a significant influence on the morphology and properties of CMs. With increasing of the ammonia mass to 1 wt% of the HIPE, the resultant carbon materials comprise not only CMs, but also some carbon sheets; the apparent density of which increased to 0.9 g/cm3 and the specific surface areas of which decreased to below 100 m2/g. In addition, the other parameters for CMs preparation were also investigated. It was found that the proper conditions were controlling the temperature of 303-333 K and the oil/aqueous phase mass ratio of 2.5:7.
Magnetic properties of (Sr1.85Ln0.15)FeMoO6 with Ln = Sr, La, Ce, Pr, Nd, Sm and Eu
Authors: Zhang Qin , Wang Qing , Sun Zhen Cui , Wang Ke Yan
Published: May 2011

Rare-earth-doped compounds (Sr1.85Ln0.15)FeMoO6 (Ln=Sr, La, Ce, Pr, Nd, Sm and Eu) have been prepared by solid-state reaction. Crystal structure and magnetic properties were investigated by means of X-ray diffraction and magnetic measurements. All the samples are single phase and belong to the I4/m space group. Due to the competing contributions of electron doping and steric effects, the unit-cell volume of the doped compounds changes slightly and does not vary systematically with the ionic radius of the rare-earth ions. The temperature dependence of the magnetization of (Sr1.85Ln0.15)FeMoO6 indicates that the Curie temperature of the doped compounds has increased upon doping, except for the Eu-doped compound.
Dielectric Composites Containing Core@shell Structure Particles
Authors: Yang Cheng , Song Hong Song , Liu Da Bo
Published: May 2011

The composites with high permittivity and low dielectric loss were obtained. The fillers were the core@shell structure of the self-passivated aluminum (Al) particles (denoted as Al@Al2O3). The Al2O3 interface between Al and polymer matrix played important role in tailored dielectric properties of composite. The transmission electron microscopy (TEM) indicated that the Al2O3 shell was 2.7 nm. The self-passivated Al/polystrene (PS) composite displayed that the permittivity almost independed on frequency in wide range (102-107 Hz) and retained high-steady level, which is 27.4 times higher than that of a neat PS. On the other hand, the effect of size ratio value of core/shell in core@shell structure filler on dielectric performance of self-passivated Al/PS composites was also explained. The insulating oxide layer (Al2O3) restricts the electron transfer between Al particles. Moreover, the self-passivated Al/PS composites exhibited very steady dielectric performance at the wide temperature range (－60 ~60 °C). The composites have potential application in dielectric materials.
Simulation Research on Cutting Process of Single Abrasive Grain
Authors: Su Chong , Zhu Li Da , Wang Wan Shan
Published: May 2011

Cutting processes of single abrasive grain were simulated respectively by fluid-solid interaction method and Smoothed Particle Hydrodynamics method. Advantages and disadvantages of the two methods were compared. Smoothed Particle Hydrodynamics method is superior to fluid-solid interaction method in simulating the deformation behavior of workpiece material for the motion of SPH particles. According to the simulation results, it is concluded that workpiece material occurs plastic deformation, flows to the side and front owing to the extrusion of abrasive grain, and finally forms chip in front of abrasive grain.
The Effect of Vacuum Heat Treatment on the Oxidation Behavior of APS Thermal Barrier Coating
Authors: Chen Ya Jun , Liu Shi Qiang , Lin Xiao Ping , Wang Zhi Ping , Wang Li Jun
Published: May 2011

Thermal barrier coating (TBC), which consisted of a NiCoCrAlY bond coat (BC) and a ZrO2-8 wt.%Y2O3 topcoat (TC), was fabricated on the nickel-base superalloy by air plasma spray (APS). The BC and TBC was treated by vacuum heat treatment (VHT). The oxidation of coating with and without VHT has been performed at 1050°C. Oxidation behavior of coatings and thermally grown oxide(TGO) scale were studied by SEM with EDS. As shown in the results, after treating by VHT, a continuous Al2O3 layer formed more rapidly on the VHT coating than that formed on the APS coating, which can act as a diffusion barrier to suppress the formation of other detrimental oxides. The pre-oxidation treatments reduced the growth rate and extend the steady-state growth stage. The TGO in VHT TBC was still a single layerAl2O3 oxide after 120h. However, after same oxidation time, the TGO in APS TBC produced a dual-layer oxide consisting of an inner Al2O3 layer and outer spinel layer. Therefore the VHT improves the oxidation resistance of APS coating.
Effect of H2S Partial Pressure on CO2/H2S Corrosion of Oil Tube Steels
Authors: Wang Ying , Li Ping
Published: May 2011

The CO2/H2S corrosion behaviors of oil tube steels N80 and P110 at different H2S partial pressure (0.2psi, 3psi, 9psi, 18psi) were investigated by autoclave corrosion tests, corrosion rate calculation and corrosion morphology observation. The results show that with the increase of H2S partial pressure the CO2/H2S corrosion rates of both steels increase at first and then decrease after the peaks appear at 3psi H2S.
The Study of the Interface Evolution and the Performance of the Ti-Al Composite Electrode Materials
Authors: Han Zhao Hui , Zhu Pei Xian , Yang Xiu Qin , Xu Jian
Published: May 2011

The Ti-Al composite electrode materials was prepared by hot press diffusion bonding in this article, and by the scanning electron microscopy (SEM), the energy dispersive spectroscopy (EDS), four-probe method, electrochemical workstation test means were used to test the structure and properties of the samples. The results show that the method of hot pressing diffusion sintering can achieve metallurgical bonding of Ti and Al with static pressure of 6MPa, holding times of 120min, in Ar and bonding temperature higher than 550°C,as well resistivity of the composite had dropped significantly, it was only 1/10 of pure Ti. The electrochemical properties of the composite electrode materials is also much better than pure Ti anode, and preparation conditions on electrochemical properties and the resistivity is consistent with law. This also shows that the conductivity of metal matrix will directly affect the catalytic properties of electrode materials for electrochemical. Therefore, changes in the composition of the electrode base material and structure not only reduces the cost and improve the performance of the electrode, also reached the purpose of energy saving.
Analysis and Research of PPTA Erosion of the Ultrasonication
Authors: Zhu Zheng Feng , Qi Da Peng , Wang Jun Hua , Han Qian , Cai Li Li
Published: May 2011

PPTA fibers made by China ShenMa Group Co., Ltd and Kevlar49 fibers made by Dupont as experimental materials were used in this paper. The differences of molecule structures were contrasted through infrared spectrum and degree of polymerization-counting by the detections of viscosity. The PPTA fibers were put into distilled water and seawater made by ourselves respectively, then ultrasonication were used to deal with them. After this, using the SEM to observe, found that the cracks appear on the fibers surfaces, presented the fibrillation and plush-like microfine fibers. Meanwhile the strength weak-link increased and breaking strength and elongation at break of fibers lowered after ultrasonication. Molecular kinetic theory was used in this paper to study loss of fibers the mechanical property.
Effect of Amino Acids on the Corrosion of Steel in Sulfuric Acid Solutions
Authors: Liu Xin Hua , Wang Qing Hui , Rui Yu Lan
Published: May 2011

The influence of amino acids on the corrosion behaviour of steel in H2SO4 solutions was studied by potentiodynamic polarization, AC impedance and weight-loss. The Potentiodynamic polarization curve results show that compound amino acids are mixed-type inhibitors which inhibit the reactions of anode and cathode; AC impedance results show that the ternary complex inhibitors have a good synergistic effect and high corrosion rate which can be proved by Resistance (Rt), double-layer capacitance (Cdl), Resistance modulus(︱Z︱), and phase angle from the Nyquist chart, Bode chart and phase angle chart. The weight-loss method show that the corrosion efficiency of composite amino acids are over 90% in 0-16 hours, 30-50°Cand 0.4-2.0mol / L sulfuric acid.
Study on Reactive Blend Systems of PA1010/ABS/PP
Authors: Zhang Jia Min , Zhu Ming Yi , Lian Zhao Xun
Published: May 2011

The impacts of multi-monomers melt grafting blends of maleic anhydride(MAH) and Styrene (St) on the crystallization behavior, morphology and mechanical properties of PA1010/ABS/PP blends were studied through the methods of SEM,themal analysis, mechanical properties analysis. The results showed that the graft copolymer generated in situ by the anhydride groups of g-PP and the amino end of PA1010 reduced the interfacial tension of blends efficiently, and the interaction of the styrene groups of the graft copolymer and ABS is helpful to improve the compatibility of three components during the melt blending process. The size of dispersed phase in blends is reduced obviously and the mechanical properties have a great improvement when the percentage of g-PP in the PA1010/ABS/PP blends increases to 10%. The tensile strength of the compatibilized PA1010/ABS/PP blends is improved by 11.7%,and the impact strength and elongation at break are increased 4 times and 4.9 times, respectively.
A Dynamically Nanoporous Metal-Organic Framework Functional Properties
Authors: Huang Xing , Jiang Li Jun , Hu Mao Lin , Li Xin Hua
Published: May 2011

3D nanoporous coordination framework [Ni2(nic)4(H2O)]n (nic=Nicotinic acid) was obtained hydrothermally from a mixture of NiCl2.6H2O and 3-cyanopyridine. X-ray single crystal analysis revealed that it consists of “mushroom-shaped” channels along a axis suitable for gas storage. N2-adsorption studies at 77 K revealed a Langmuir surface area of 200 m2/g and a pore volume of 0.12 cm3/g. The compound shows dynamic dehydration and rehydration behaviors with the formation of 0D coordination [Ni(nic)2(H2O)4], accompanied by crystal-to-crystal transformation. The structural transformation significantly changes the character of magnetic exchange interactions and gas storage.
The Selection and Application of Filling Material Based on Long-Term Strength of Backfill Body
Authors: Fu Bao Jie , Tu Min
Published: May 2011

High stress makes backfill body present the rheological properties in deep mine. This paper first uses RRTS-ⅢA to carry on creep test of specimen in different proportion, according to ε-t curves under different load levels to determine the specimen’s long-term strength, based on the exponential relationship of rock block and rock body, the long-term compressive strength is derived, combining with concrete parameters of working face, mixture ratios of filling material which meet long-term stability are selected, while analyzing the support resistance of backfill body. The results show that this design can effectively avoid the rheological instability of backfill body.
Magnetization Evolution with Hole Doping Level in (Sr2-xNax)FeMoO6
Authors: Zhang Qin , Li Chang , Xu Zhen Feng , Wang Ke Yan
Published: May 2011

Hole doped double perovskite compounds (Sr, Na)2FeMoO6 with the Na content of x = 0, 0.02, 0.03, 0.07 and 0.17 have been synthesized by sol-gel method. Effects of hole doping on the crystal structure and magnetic properties of Sr2FeMoO6 have been investigated. XRD pattern indicates that all the samples are of single phase and belong to the space group I4/m. The degree of cation ordering in the Na-doped Sr2FeMoO6 compounds shows a non-monotonic variation with the doping level. The saturation magnetization of the compound increases with x for x<0.17. Similar to the electron doped Sr2FeMoO6, provided that the doped hole enters selectively the spin-down band, the variation of the saturation magnetization can be explained in light of the ferrimagnetic model (FIM).
Production and Application of High Capacity Bottom Blowing Purging Plugs for Converter
Authors: Qin Yan , Chen Yong , Liu Guo Tao
Published: May 2011

The article main discusses the development, production and application of directional multi -microtubule purging plugs which used in large or medium sized bottom blowing converter. This type of purging plug makes the gas flow in the metal pipes with very small resisting force and good air tightness. It is produced by using cold isostatic pressing, and has high strength and good corrosion resistance. Mainly employed high purity fused magnesia, flake graphite as raw material, and used phenolic resin as binder, and added titanium carbide, boron carbide as antioxidants and additives, which improved anti-oxidation, corrosion resistance and washing resistance, and the life of purging plug is highly improved accordingly.
Preparation of Stoichiometric TiNx Films by Laser CVD with Metalorganic Precursor
Authors: Gong Yan Sheng , Zhou Wei , Tu Rong , Goto Takashi
Published: May 2011

Nearly stoichiometric TiNx films were deposited on Al2O3 substrates by laser enhanced chemical vapor deposition (CVD) with tetrakis (diethylamido) titanium (TDEAT) and ammonia as the source materials. Emphases were given on the effects of laser power (PL) and pre-heating temperature (Tpre) on the composition and deposition rate of TiNx films. Single phase of TiNx films with columnar cross section were obtained. The ratio of N to Ti in TiNx films increased with increasing PL and was close to stoichiometric at PL > 150 W. The deposition rate of TiNx films with a depositing area of 300 mm2 was about 18-90 µm/h, which decreased with increasing PL and Tpre.
Structure and Properties Analysis of Microcapsulated Capsaicin Prepared by Diphase Emulsion Method
Authors: Wang Jin Cheng , Chen Si Hao , Xu Shan Zhong , Xue Ye , Lou Jian Zhong
Published: May 2011

With polylactic acid (PLA) resin as walls and capsaicin as core substances, microcapsules were prepared based on diphase emulsion method. The microcapsule characteristics such as the particle size, inner structure and properties were investigated. The morphology and size distribution of the microcapsules were analyzed by laser particle size analyzer and scanning electron microscopy (SEM). The microcapsules had a mean diameter of about 60~120 µm. In addition, their thermal properties were measured by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). It was demonstrated that the melting point and thermal stability were improved or changed compared with that of the pure capsaicin. These phenomena were caused by the encapsulated PLA resin over the surface.
The No-Cyanide Copper Electroplating with Dipping-Plating Pretreatment
Authors: Tang Xue Jiao , Guo Ai Hong , Wang Jin Gang , Gao Min , Shen Bo Xiong
Published: May 2011

The acid dipping-plating pretreatment was applied on iron substrate prior to no-cyanide copper plating process. After being pretreated in dipping solution, the thin copper film formed on iron substrate which could change the cathode electronic potential and enhance the copper plating rate in the follow-up copper electroplating. As a comparation, the iron substrate was directly electroplated in another copper plating bath without dipping-plating pretreatment (DPr). The effects of temperature and electric current density on the copper plating rate were investigated in both process with DPr and process without DPr. And the mechanism was discussed.
Preparation and Electrochemical Properties of Fluorinated Mesoporous Carbon Foams for Electric Double-Layer Capacitors
Authors: Cao Yong Jie , Liu Ming Xian , Gan Li Hua , Lv Yao Kang , Xu Zi Jie , Hao Zhi Xian , Liu Hong Lai , Chen Long Wu
Published: May 2011

We reported the preparation and electrochemical properties of fluorinated mesoporous carbon foams (F-MCFs) for application as electric double-layer capacitors (EDLCs). By using fluorinated resol which was obtained from the polymerization of formaldehyde, phenol, and 3-fluorophenol as the carbon source and fluorin precursor, and triblock copolymer F127 as a template, F-MCFs were prepared through evaporation induced self-assembly strategy. The F-MCFs were characterized by N2 adsorption and desorption, transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). The results indicate that the F-MCFs possess highly ordered mesostructure with a specific surface area of 675 m2/g, a uniform pore size of 2.2 nm and a pore volume of 0.12 cm3/g. The wettability of F-MCFs was investigated by contact angle analysis. The contact angle of F-MCFs for water is 111.5o, much lower than that of mesoporous carbon foams (MCFs) (141o), indicating that the surface wettability of F-MCFs is improved by the introduction of fluorin into the carbon matrix. The enhancement of wettability would increase the surface contact of electrolyte and electrode and accelerate the ion transfer within the pore channel, and thus improve the electrochemical properties of F-MCFs. The electrochemical properties of the F-MCFs have been investigated by cyclic voltammetry (CV) and galvanostatic charge/discharge in electrolyte of 6 mol/L KOH with a three-electrode system. F-MCFs present linear galvanostatic charge-discharge curve at a loading current of 10 mA, and possess good charge-discharge efficiency over 98%. The specific capacitance of the F-MCFs is 220 F/g, significantly higher than that of the MCFs (140 F/g). F-MCFs show important prospect as electrode materials for the application in EDLCs.
Catalysis Investigation of PET Depolymerization by ZnSrO2 under Microwave Irradiation
Authors: Geng Li Li , Han Chun Hua , Zhang Dong
Published: May 2011

In this paper, the powder of SrZnO2 was prepared by 1050°C solid-state reaction. The catalysis of SrZnO2 to the depolymerization of PET under microwave irradiation was studied under different temperatures. The results showed that the depolymerization rate of PET was reached 92.6% at 180°C when the reaction time was 220min. It was also found that the depolymerization rate of PET catalyzed by SrZnO2 was more than that of without catalyst under microwave irradiation.
Research on Microstructure and Room Temperature Plasticity of Mg94.5Zn4Y1Er0.5 Alloy Sheet
Authors: Wang Zhong Jun , Xu Yang , Cheng Jia , Wang Zhao Jing , Kang Bao Hua , Zhao Nan Rong
Published: May 2011

The microstructure and tensile properties at room temperature of as-extruded Mg94.5Zn4Y1Er0.5 alloy sheet were studied. The results show that the alloy is mainly composed of equiaxial-liked α-(Mg) grains and W phase containing lots of rare earth elements (F.C.C. structure, a=0.707nm). The elongation and tensile strength of the alloy sheet in hot extruded and transverse direction are 25.5 %, 29.9 % and 247 MPa, 240 MPa, respectively. The above results manifest that the W phase stimulate the DRX during hot extrusion, reduce the preference of basal texture of magnesium alloy, markedly improve the plastically shaping capability at room temperature.
Study on the Preparation and Properties of Collagen Fiber- Polyurethane Composite Film
Authors: Ma Xing Yuan , Guo Yong Sheng , Lu Ling Yun , Jiang Kun
Published: May 2011

Chrome-tanned collagen fiber is the major solid waste of leather industry which is difficult to biological degradation and would caused serious pollution to the environment. However, the collagen fibers as a natural biological polymer materials, has unique properties of surface reactivity that the other polymer materials are not available. In this paper, the composite film of chrome-tanned collagen fiber- polyurethane (PU) were prepared is owing to H2O induced phase separation, and measured water vapor permeability, permeability, mechanical properties and microstructure. The results showed that the composite film of chrome-tanned collagen fiber-PU have continuous porous structure, which can improve the water vapor permeability and permeability of film, but reduce the mechanical properties of film. Thermal gravimetric analysis (TGA) showed that the thermal effect of collagen fiber and PU did not change significantly, so composite of collagen fiber and polyurethane by H2O induced phase separation belongs to physical process. The result demonstrates that this composite film has continuous porous structure, and collagen fibers with unique properties of surface reactions, so this material have potential applications in many fields.
MISPE Combined with GCMS for Analysis of Organophosphorus Pesticides from Environmental Water Sample
Authors: Zhao Liu , Ma Zhi Hong , Pan Li Gang , Wang Ji Hua
Published: May 2011

In the present work, a GCMS method coupled with Molecular imprinting technique was developed for the simultaneous determination of five organophosphorus pesticide residues (i.e., diazinon, malathion, phosphamidon, isofenphos-methyl and quinalphos) in environmental water. In order to obtain a highly selective recognition of OPPs, we synthesized molecularly imprinted polymers (MIPs) using malathion as the template, methacrylic acid as the monomer and ethylene glycol dimethacrylate as the crosslinker. After polymerization, molecularly imprinted solid-phase extraction (MISPE) was used for the selective preconcentration of OPPs. The specificity of MIPs and non-imprinted polymers were investigated. The use of MISPE improved the accuracy and precision of the GCMS method. The recoveries of OPPs extracted from water sample at a 1μg/mL spike level were in the range of 82%~97%. The results showed that MIPs enable the selective extraction of OPPs successfully from water sample, and demonstrated the potential of MISPE for selective and cost-effective sample pretreatment.
Polyaniline/nano-in2O3 Composites Used as a Sensitive Material to NH3
Authors: Xie Ying Nan , Shi Zheng Hai , Liu Jian Lian
Published: May 2011

In presence of nano-In2O3 which were synthesised via a reverse microemulsion, Polyaniline/nano-In2O3 composites were prepared by in-situ polymerization of aniline in 5-sulphosalicylic acid(SSA) aqueous solution. They were characterized by means of TEM, XRD and FTIR.. TEM and XRD showed that the average diameter of In2O3 particles was 15nm with a narrow size distribution and with a high degree of crystallization. The FTIR suggested that the structure of PAn-SSA was not be changed by the mixture of In2O3. Sensitivity of the composites to 100~1000ppm NH3 were studied, the results reveal that polyaniline/nano-In2O3 composites have short response time and good reversibility, the gas sensitive of composites to NH3 under 300ppm increased linearly with the increasing concentration of NH3 and decreased with the increasing of In2O3 concentration. Long-term stability of polyaniline/nano-In2O3 composites were also investagated, it can be concluded that the organic-inorganic hybrid materials have better environmental stability.
Preparation and Properties of Emulsion Coating of Polyacrylate Modified by In-Situ Nano-Hybrid Silica
Authors: Gao Jun Gang , Lv Hong Qiu , Zhang Xue Fang
Published: May 2011

The polyacrylate emulsion coating modified by nano-silica was prepared by In-situ method. Tetraethoxysilane (TEOS) was added as the precursor of SiO2 in the late of the emulsion polymerization. The structure and properties of emulsion and latex film were characterized. The results showed that the nano-hybrid silica/polyacrylate emulsion coating with good performance can be prepared by In-situ method. FTIR analysis indicated that the -Si-O-Si- structure has embodied in the coating film. The particle diameter of emulsion is 378nm when nano-SiO2 content is 6% and the dispersing index is 0.164. The mechanical loss peak temperature (Tp) of coating film with 6% nano-SiO2 is 60.6°C which increase 6°C than pure emulsion film. The nano-hybrid emulsion coating has a good performance, such as good acid-alkali resistance and hardness.
Fabrication of (GOx/Pt-DENs)n/CNTs Nanocomposite and their Electrochemical Properties for Anode in Biofuel Cell
Authors: Zhang Jian Mei , Zhu Yi Hua , Yun Jie Ping , Yang Xiao Ling , Li Chun Zhong
Published: May 2011

In this paper, a method of carbon nanotube coated with the dendrimer encapsulated platinum nanoparticles（Pt-DENs/CNTs） was introduced, and the properties of enzyme electrode modified by the Pt-DENs/CNTs were investigated. The formation of the self-assembled (GOx/Pt-DENs)n/CNTs construction was expiored by high resolution transmission electron microscopy (HRTEM). And the results indicated that the uniform growth of the layer-by-layer nanostructures onto carboxyl-functionalized CNTs. The electrochemical properties of the enzyme anode modiﬁed by (GOx/Pt-DENs)n/CNTs, which act as biofuel cell anode, was studied by electrochemica measurements. Owing to its nanostructure, the (GOx/Pt-DENs)n/CNTs heterostructures have a large specific area, a high surface active center, good conductivity and macro tunnel effect, therefore the electrode modified by (GOx/Pt-DENs)n/CNTs has series of attractive electrochemical characteristics so as to enhance biofuel cell’s function.
Research on Mechanical Properties of Modified Organic Montmorillonite Reinforced Nature Rubber(NR) Composites
Authors: Zheng Xiao Yu , Wang Jin Cheng , Yang Ke
Published: May 2011

In this paper, hyperbranched organic montmorillonite (H-OMMT) with hydroxyl (-OH) groups was prepared. The organic montmorillonite (OMMT) was used as a reinforcing agent in NR matrix. The H-OMMT modified natural rubber (NR) had good mechanical properties with the addition of the H-OMMT. Properties, such as tensile strength and abrasion loss, were researched and compared. Results showed that NR/H-OMMT-5% composite had the best tensile and were resistant properties.
Potential Analysis in Nanoturning of Single Crystal Silicon Using Molecular Dynamics
Authors: Liang Ying Chun , Wang Zhi Guo , Chen Ming Jun , Chen Jia Xuan , Tong Zhen
Published: May 2011

Molecular dynamics simulations of the single crystal silicon nanoscale cutting with a diamond tool in ductile mode are carried out to investigate the adhesion phenomenon. After relaxation the silicon atoms on the surface reconstruct to make the potential decrease. The silicon atoms close to the diamond tool have the lowest potential (<-5.5 eV) and form a stable structure with surface atoms on the tool surface.
Physical and Electrical Properties of Lead-Free (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3 Ceramics
Authors: Wang Chun Huy
Published: May 2011

Extending the investigations on (Bi0.5Na0.5)TiO3-based solid solution for lead-free piezoelectric ceramics, this paper consider the complex solid-solution system (Bi0.5Na0.5)TiO3–(Bi0.5K0.5)TiO3 [BNT-BKT]. (Bi0.5Na0.5)TiO3 with 7~ 30 mol% (Bi0.5K0.5)TiO3ceramics have been prepared following the conventional mixed oxide process. A morphotropic phase boundary (MPB) between rhombohedral (R) and tetragonal (T) was found at the composition 0.82BNT-0.18BKT with correspondingly enhanced piezoelectric properties. The electromechanical planar coupling factor is higher for compositions near the MPB. The mechanical quality factor (Qm), planar coupling coefficient (kp) and thickness coupling coefficient (kt) of 0.82BNT-0.18BKT ceramics were 125, 28.8% and 47.4%, respectively.
Curing, Thermal and Mechanical Properties of Liquid Crystalline p-SBPEPB/BPAER/DDE System
Authors: Huo Li , Gao Jun Gang , Du Yong Gang
Published: May 2011

The curing, thermal and mechanical properties of bi-component system for bisphenol A epoxy resin (BPAER) modified by liquid crystalline Sulfonyl bis(4,1-phenylene)bis[4-(2,3-epoxypro pyloxy)benzoate] (p-SBPEPB), with 4,4'-diaminodiphenyl ether (DDE) as a curing agent, were investigated. The effect of the different liquid crystalline contents and the heating rate on curing reaction was discussed. The results show that the curing peak temperature decreases, curing rate increases, the glass transition temperature (Tg)and impact strength all increase with adding of liquid crystalline p-SBPEPB when the content is not over 8wt%.
Effect of Deformation Degree on Mechanical Properties of AZ80 Magnesium Alloy
Authors: Chang Xu Qing , Ma Tie Hua
Published: May 2011

The mechanical properties and microstructures were investigated for AZ80 Mg alloy during plane strain compression and extrusion processing. The results show the tensile strength increases with the increasing deformation degree in the two-phase zone due to sufficient dynamic recrystallization and work-hardening effect. In single-phase zone, the tensile strength increases firstly and then does not varies basically when the deformation degree is greater than a certain critical value. This is very beneficial to optimize processing parameters to obtain microstructure with improved mechanical behavior.
Influence of Shape of Coarse Aggregate on Performance of Open Graded Friction Course
Authors: Zhang Jin Xi , Wang Chao
Published: May 2011

As a new kind of pavement material, the Open Graded Friction Course (called OGFC) has many advantages, and so is rapidly popularized in China recently. However, the performance of OGFC decreases with the utilization of road, such as the decrease in permeability, durability and so on. In the present study, the influence of the shape of coarse aggregate, which is the most important material in OGFC, on the performance of OGFC was investigated in laboratory. The shape of coarse aggregate is indicated by the bulk density and total 4 kinds of aggregates with different bulk density were produced artificially and tested in this study. When the shape of coarse aggregate changed, the wear resistance and dynamic stability of OGFC also changed lightly. The bulk density of aggregate has no serious influence on the void content, but has obvious influence on the permeability of OGFC. The shape of continuous void in horizontal cross-section becomes rounder when the aggregate with large bulk density is used. The rounder continuous void is benefit for the flowing of water, so the permeability of OGFC is improved.
A Novel Photochromic Diarylethene Based on Thiophene and Isoxazole Moieties for Optical Recording
Authors: Liu Hong Liang , Pu Shou Zhi , Liu Wei Jun , Cui Shi Qiang
Published: May 2011

A novel photochromic diarylethene based on isoxazole moiety was synthesized and its photochromic and fluorescent properties were also investigated. It underwent reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light in hexane and in PMMA film. The compound exhibited remarkable photochromism, changing from colorless to purple after irradiation with UV light. When irradiation with UV light, the fluorescence intensity declined remarkably. The results showed that the diarylethene exhibited a relatively strong fluorescence switch along with the photochromism from open-ring isomer to closed-ring isomer. Using this dithienylethene 1c as optical storage was performed successfully.
The Preliminary Study of the Manufacturing Process of Veneer Composite Plank
Authors: Zhang Wei Qi , Zhang Shi Cheng , Pang Jiu Yin , Zhen Xing
Published: May 2011

This study focuses on the manufacturing process of veneer composite plank and test the mechanical properties.The results showed that: ① In the dipping process, when the dipping time was 20min and adhesive solids was 25%,the veneer composite plank can get a better mechanical properties; ②In the low-temperature drying process, according to the mechanical properties and drying efficiency, low drying temperature appropriate select 50°C; ③Considering the mechanical properties and the cost issue as the density increases, select the density of 1.0g/cm3 is appropriate. Prove that the production technology is feasible, its products have uniform texture and good mechanical properties can be widely used for furniture, flooring and structural materials and other fields.
Influence of Copper as a Co-Catalyst of Potassium Hexaniobate Nanotubes on the Photocatalytic Hydrogen Evolution from a Methanol Aqueous Solution
Authors: Zhao Xue Ling , Yang Xiao Hui , Li Xiang Qing , Yao Ping Ping , Kang Shi Zhao , Mu Jin
Published: May 2011

In the presence of Cu2+ ions, the photocatalytic hydrogen evolution from a methanol aqueous solution was achieved when potassium hexaniobate nanotubes were used as the catalyst. It was found that there existed a photo-induced period in the initial reaction stage. Furthermore, the photo-induced period was prolonged by increasing the amount of Cu2+ ions. After that, the rate of hydrogen evolution was dramatically improved. Combined with the reaction phenomena and the result of the photocatalytic hydrogen evolution, it was deduced that the Cu2+ ions captured the photo-generated electrons of potassium hexaniobate nanotubes in the photo-induced period. Consequently, the Cu2+ ions were reduced and deposited on the potassium hexaniobate nanotubes. When the mass ratio of Cu to potassium hexaniobate nanotubes was 3 wt%, the rate of hydrogen evolution over the catalyst reached 21.9 mmol·g-1·h-1, which could almost match with Pt as a co-catalyst. These results showed that Cu was an effective alternative to Pt as a co-catalyst of potassium hexaniobate nanotubes for the photocatalytic hydrogen evolution from the methanol aqueous solution.
Facile Preparation of AgIn5S8 Pompon-like Microspheres with High Visible Light Photocatalytic Activity
Authors: Yao Ping Ping , Wei Dai Long , Zhao Xue Ling , Kang Shi Zhao , Li Xiang Qing , Mu Jin
Published: May 2011

The pompon-like microspheres of AgIn5S8 with a cubic phase were prepared in a low temperature aqueous solution using mercaptoacetic acid as capping agent and thioacetamide as sulfur source and characterized with XRD, UV-vis absorption spectra, SEM and BET analysis. It is interesting that the microspheres are quite open and puffy. More importantly,the obtained microspheres showed remarkable photocatalytic activity for the degradation of methyl orange under visible light irradiation, which is probably due to the pompon-like morphology for providing reactive sites and facilitating the charge transfer between the target pollutant and the photocatalyst. This method could be extended to the synthesis of other functional micro/nano materials.
Titanium Dioxide Supported on Activated Carbon Performance of Wastewater
Authors: Wang Gong Jun , Wang Dong Mei
Published: May 2011

Photocatalytic is a developed technology in recent years for the wastewater treatment which is a new advanced oxidation technology. Stable, durable and highly active Nano-TiO2 is photocatalytic technology to be practical needs to solve, and also there are the important research hotspot.This paper adopts titanium sulfate and ammonia as raw material with nut shell activated carbon as a carrier was highly active load type, and activated TiO2 liquor X-3B simulation wastewater as the object of the degradation factors.
Decomposition and Statistical Analysis of Bulk Density Levels of Dense Phase Flyash Powder Flow within a Pneumatic Conveyor
Authors: Chen Wei , Williams Kenneth Charles , Jones Mark Glynne
Published: May 2011

The material pulse flow structure within the fluidized dense phase pneumatic conveying of flyash powder was studied using the Electrical Capacitance Tomography (ECT). Decomposition of the bulk density levels within the pipe cross-sectional area were obtained and statistical analysis of bulk density waves were performed. The results suggest that the pulse amplitude and duration obeyed the Weibull and lognormal distributions. In addition, bulk density factor was found to have a linear relationship with pulse amplitude; however, it is independent of pulse duration.
Eco-Friendly Dye-free Coloration Technology for Wool Based on Fenton Reagent Pretreatment
Authors: Sui Yan Ling , Cui Yong Zhu
Published: May 2011

The wool was pretreated with Fenton reagent in this paper, on this basis, 4-hydroxy benzaldehyde and concentrated nitric acid were used to discuss the dye-free coloration deeply. It was analyzed comparatively through a series of experiments on the wool before and after Fenton reagent pretreatment, and the effects of concentrations, temperature and time on the coloration were further discussed. The experiment indicated that, compared with untreated wool, the color of wool with Fenton reagent pretreatment was deeper and the coloration rate was quicker. It realized good coloration at lower temperatures, which achieved the goal of saving energy and emission reduction. The optimal conditions were that concentrations of 4-hydroxy benzaldehyde and concentrated nitric acid were 2.5% and 3% respectively, reacting time was 90min, and reacting temperature was 70°C.
Electrochemical Capacitive Performances of Ordered Carbon Nanotube Arrays
Authors: Gao Xiu Li , Xing Wei , Zhou Jin , Zhuo Shu Ping
Published: May 2011

Arrays of ordered carbon nanotubes (OCNT) was synthesized successfully using aluminated mesoporous silica as hard template. XRD tests and TEM observations showed that OCNT was composed of carbon nanotube arrays in p6mm symmetry. N2 sorption analyses demonstrated that OCNT possesses typical mesoporous structure and centralized mesopore distribution. OCNT are superior to Maxsorb, an active carbon with super high surface area, in capacitive behavior and power output due to their ordered pore-structure, which favors the fast diffusion of hydrated ions. As evidenced by cyclic voltammetry measurements, OCNT show good capacitive behaviors (exhibiting a high capacitance of 180 F/g even at very high sweep rate of 50 mV/s, as compared with much reduced capacitance of 73 F/g for Maxsorb at the same sweep rate). OCNT can provide very high power density while still maintaining good energy density, thus having potential uses in electrochemical double layer capacitor (EDLC), particularly where both high power output and energy density are required.
Synthesis of Poly(acrylamide-Methacrylate)-G-Octylphenyl Polyoxyethylene and its Micellar Behavior in Aqueous Solution
Authors: Zhang Dong Xia , Hu Wen Hui , Wang Fang Ping , Xue Lin Ke , Du Xin Zhen
Published: May 2011

An amphiphilic graft copolymer with poly(acrylamide-methacrylate) as a main chain and octylphenyl polyoxyethylene as side chains (P(AM-MA)-g-C8PhEO10) was successfully synthesized via free radical copolymerization. The structure and the composition of the graft copolymer were characterized by FTIR, 1H-NMR and elemental analysis (EA) in detail. The absolute molecular weight of the copolymer is 1.304×106, as determined by static light scattering (SLS). The molar ratio of acrylamide monomer to the macromonomer is 33:1 in the copolymer and 53 C8PhEO10 branch chains attach to a P(AM-MA) backbone. The micellar behavior of P(AM-MA)-g-C8PhEO10 was preliminarily studied by means of surface tension measurements, transmission electron microscope (TEM) in aqueous solution. It was found that the stable spherical micelles with core-shell structure are formed and polymolecular micelles are larger and more compact than monomolecular micelles. In addition, the graft copolymer has favorable thermal stability.
Manufacturing Technique of Stab-Resistant Laminated Composite Nonwoven Fabrics
Authors: Lou Ching Wen , Lin Chia Chang , Huang Chao Chiung , Chen Jin Mao , Ma Wen Hsuan , Lin Jia Horng
Published: May 2011

In this study, the nonwoven composites were made of high strength nylon 6 staples and low-melting-point polyester staples using needle-punching and thermal-bonding. By tensile strength test and constant-rate stab resistance test, the optimum parameters of the composites were obtained for developing and designing the stab-resistant nonwoven composites. The optimum experimental conditions for the nonwoven composites were as follows: the temperature for thermal-bonding was 150 °C; and the wheel speed of thermal compression was 0.5 m/min.
Effect of Thixotropic Agent on the Properties of Conductive Silicone Rubber Gasket for EMI Shielding
Authors: Liu Xiao Hei , Xia Zhi Dong , Zhao Meng Ke , Zhou Hu , Li Ying , Xu Guang Chen , Guo Fu
Published: May 2011

In this study, a thixotropic agent was applied to improve the aspect ratio of the silicone rubber gasket and the resulting obtained through modification showed an increase in aspect ratio from 0.26 to 0.91 with the relative to the gasket without thixotropic agent. Compared with the silicone rubber without thixotropic agent, the mechanical properties of the silicone rubber with thixotropic agent were discussed and the results revealed that the shift was very small. In addition, using Ag-coated Cu dendritic powder as conductive fillers, conductive silicone rubber with the resistivity (0.004Ω·cm) was prepared comparable to the relative commercial products can be used for electro-magnetic interference (EMI). The reliability of the conductive composites under aging at 85°C and 85% room humidity (RH) in a temperature/humidity chamber for 48 h was also discussed and the results showed that the shift of the volume resistivity was almost negligible which can meet the actual needs completely.
Odd-Carbon Alkyl-Substituent Effect on Liquid Crystalline Properties of Discotic Hexa-Peri-Hexabenzocoronene Molecule
Authors: Liu Xu Ying , Jiang Yu , Wang Wen Guang , Pu Jia Ling
Published: May 2011

Hexa-peri-Hexabenzocoronene (HBC), as the smaller graphene fragment consisting of 13 fused benzene rings, possesses a strong tendency to stack together via π-electronic interaction. In this paper, the 1,2-(4-bromomethyl-1-yl) acetylene was alkylated by Grignard reagent to form corresponding 1,2-bis(p-pentadecanylphenyl)acetylene. Cobalt(0)-catalyzed cyclotrimerization was carried out to give hexaphenylbenzene analogue. This step was followed by intramolecular cyclodehydrogenation to yield the desired product HBC-C15. The identity and purity of the new compound was confirmed by UV-vis spectrometer and 1H NMR spectrum. Its thermal behavior and self-assembly were studied by differential scanning calorimetry and polarizing optical microscopy.
Effect of Heat Treatment on Microstructure and Corrosion Resistance of Ni-P/BN(h) Composite Coatings
Authors: Peng Cheng Zhang , Zhu Ling Ling , Chen You Ming
Published: May 2011

The Ni-P/ BN(h) composite coatings were prepared by pulse electroplating,and were heat treated at temperature of 200～400°C.The microstructure of the composite coatings was identified by X-ray diffraction,the corrosion behavior of the composite coatings in 3.5%NaCl and 10%H2SO4 solutions was investigated by the linear polarization measurements and scanning electron microscope (SEM).The results show that the as-deposited is an amorphous structure,the precipitated phases are Ni12P5 and Ni5P2 metastable state phases when heat treatment temperature is below 300°C,the precipitated phases is Ni3P stable state phase heat-treated at 400°C，the composite coating was crystallized in great degree.Both the as-deposited and heat treated composite coatings revealed best corrosion resistance in 3.5%NaCl and 10%H2SO4 solutions.
Online Roller Punching Equipment Application in Cold Roll Forming
Authors: Du Yan Bing , Han Jing Tao , Zhang Yong Jun , Jiang Zheng Yi
Published: May 2011

Online roller punching is required for many cold forming sectional steel products, and the productive efficiency of punching is significantly affected by uncoordinated speed between the traditional punching and the cold roll forming. Based on the analysis of the mechanical structure and the mould structure of the equipment, a new roller punching equipment has been developed for continuous high-speed punching process of steel strips with thickness of less than 1mm.
Adsorption Behavior and Inhibition of N,N-Diethylammonium O,O'-Dicyclohexydithiophosphate for Carbon Steel in Acid Medium
Authors: Xie Bin , Lai Chuan , Zou Li Ke , Zeng Xiang Mei , Huang Chun , Zeng Ni , Wang Yan Mei
Published: May 2011

The inhibition effect of N,N-diethylammonium O,O'-dicyclohexyldithiophosphate(NOCP) against the corrosion of carbon steel in HCl solution was studied by weight loss measurement, potentiodynamic polarization and atomic force microscopy techniques. The studies of weight loss measurement show that the inhibition efficiency was up to 99.54 % at the inhibitor concentration of 2.717×10-4 M in 1.0 M HCl solution at 25°C. The adsorption of NOCP on carbon steel surface obeys the Langmuir isotherm. Polarization curves indicate NOCP is a mixed-type inhibitor, and the obtained standard free energy of adsorption suggests that the chemisorption takes place spontaneously. The effects of temperature, acid concentration and immersion time were also studied.
Study on Poly-Si Thin Films by Vacuum Evaporation
Authors: Wang Zhou , Li Bin , Fu Chuan Qi , Murotani Takayuki
Published: May 2011

The process of Vacuum Evaporation and characteristic of poly-Si thin film on different kinds of substrates (copper and glass) are studied in this thesis. The samples were characterized by TEM, AFM and metallographic microscope. The result indicates that the samples after annealing treatment are polycrystalline. Thin film on copper substrate shows better properties in degree of crystallization, grain smoothness, compact density and uniformity. The thickness of thin films on both copper and glass substrates is 1.2µm.The grain size ranges from 0.1~0.15µm.And the pressure-resisting value of the poly-Si thin film is 384.2V.