15 June 2012, Volume 43 Issue 11

    

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研究与开发
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  Synthesis and Damping Properties of Hyperbranched polyurethane / Polyacrylic Ester Emulsion

  . 2012, 43(11): 1-0.

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  The emulsion of waterborne polyurethane /PA was prepared with Isophorone diisocyanate, PTMEG, acrylate monomer as main material, trimethylolpropane and self-made hyperbranched polyurethane as cross-linking agent. Thermogravimetric analysis (TGA) and Dynamic mechanical analysis (DMA) results showed that the heat resistance of polymers with two different cross-linking agents was little difference, and the damping properties was good when damping factor tanδ was about 0.75, the temperature range of tanδ greater than 0.3 was about 60℃. And the damping properties was better with the increasing contents of PA.
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  Preparation and Photocatalytic Properties of V-Doped TiO2 nanotube arrays

  Baolong XUQifu Zhang

  . 2012, 43(11): 2-0.

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  The titanium vanadium alloy as raw material, using anode oxidation method, the highly dense, ordered vanadium doped titania nanotube arrays were fabricated. The nanotube arrays characterization of morphology, composition and structure were determined by scanning electron microscope (SEM)，Energy Disperse Spectroscopy (EDS) and powder X ray diffraction (XRD), the results showed that the different weight concentrations of HF electrolyte prepared by radial different nanotube arrays, with the weight concentration of the electrolyte HF changing from 0.5wt% to 1.5wt% ), the variation of nanotube arrays’ diameters was from 39.7nm to 72.7nm. At room temperature, under visible light irradiation, photocatalytic degradation of 10mg/L methyleneblue solution was carried out to test its photocatalytic properties. The results showed vanadium doped titania nanotube arrays photocatalytic properties of titania nanotube arrays is better than that of pure sample S1, and the samples were fabricated under HF electrolyte weight concentration 1.0wt% have more photocatalytic efficiency than other experimental conditions. The mechanism was briefly discussed.
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  Ammonium polyphosphate proton conductor composites as electrolyte for intermediate temperature fuel cells

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  . 2012, 43(11): 3-0.

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  Proton-conductive composite electrolytes consisting of xNH4PO3-SiO2(x=1,2,4) was synthesized by a sol-gel method. X-ray diffraction investigation showed that NH4PO3 was chemically stable in the process of sol-gel preparation. The conductivity of the resulted composites was measured with impedance spectroscopy. The conductive behavior was improved by increasing the molar ratio of NH4PO3. Meanwhile the activation energy for conductivity decreased with NH4PO3 content. This indicates that NH4PO3 is responsible for the high conductivity and SiO2 serves as a supporting matrix. The proton conductivity was dramatically enhanced by increasing the water content, indicating that the effect of water is significant. Maximum power density was 4.8mW.cm-2 at 250℃ when humidified hydrogen and oxygen were used as the fuel and oxidant.
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  The study of the preparation of NiFe/IrMn multilayers and MgO doping

  Ming-Hua LI ;;;;

  . 2012, 43(11): 4-0.

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  The Ta/NiFe/IrMn/Ta films were prepared by magnetic sputtering. The effects of IrMn sputtering power and magnetic layer’s thicknesses on the properties of FM/AFM multilayer were studied. The MgO was doped in the IrMn anti-ferromagnetic layer. The MgO doped content in anti-ferromagnetic layer has different effects on the exchange bias. With the increase of the MgO doped content in anti-ferromagnetic, the exchange bias field gradually increased and reached a maximum value at the MgO doped of about 2.5%. Then the exchange bias field can be decreased with a further increase of the MgO doped content. The doping proper amount of MgO in the IrMn anti-ferromagnetic layer can effectively increase the Hex.
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  Preparation and Photocatalytic Properties of TiO2@SiO2 microsheres

  . 2012, 43(11): 5-0.

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  In this article, we use TBOT as titanium source and SiO2 spheres as template to prepare core/shell TiO2@SiO2 microspheres . The products were characterized by SEM, XRD, EDS and their photocatalytic property was measured. It is found that the photocatalytic activity of TiO2@SiO2 is better than pure TiO2 nanoparticles which prepared by the same method without SiO2 template. When using TiO2 @ SiO2 as photocatalyst, the degradation rate of methyl orange can reach 82%,but pure TiO2 only reach 56% after 180min .photocatalysis efficiency increased by 26%，.it indicate the products have good photocatalytic performance.
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  Fabrication of superhydrophobic surface on glass fibers reinforced epoxy resin composites

  Chun-Qi wang

  . 2012, 43(11): 6-0.

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  Through hand lay-up and vacuum/pressuer bag mouding techniques, the glass fibers reinforced epoxy composite materials which has the functional layer of CaCO3 and epoxy resin were prepared. By chemical etching and surface modified techniques, the superhydrophobic surface of glass reinforced epoxy composite materials was prepared. The morphology and superhydrophobicity were analyzed by scanning electron microscopy (SEM) and water contact angle measurement. The results show that the micro/nano-binary porous structure was formed on surface of glass reinforced epoxy composite materials and the water contact angle value was up to 160.03°. In addition, stored in an ambient environment, the as-prepared superhydrophobic surface has essentially stability.
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  Study on hot-deformation behavior of directionally solidified Fe-6.5wt.％Si alloy

  Xian-shi FANG;;;;

  . 2012, 43(11): 7-0.

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  The hot-deformation behaviours of directionally solidified Fe-6.5wt.%Si alloy were invested by Gleeble1500 thermal simulation. During hot deformation the dynamic recrystallization was very hard to take place, so the soft mechanism of the DS Fe-6.5wt.%Si alloy was mainly dynamic recovery and many deformation bands formed in the columnar grains. The nucleation of dynamic recrystallization was observed at the columnar grain boundaries. The deformation behavior of columnar-grained specimens is almost the same with equiaxed-grained specimens in ordered phase zone. In the disordered phase zone, deformation activation energy for the columnar structure of DS Fe-6.5wt.% alloy reduced from 294 to 260kJ?mol-1.
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  Electrical Properties of Tellurium-based Composite Films in Nano-scale

  Ping Gan

  . 2012, 43(11): 8-0.

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  The surface potential and capacitance gradient were characterized by AFM/SPM in nano-scale. The results showed that the maximum contact potential difference was about 700mV, The relative dielectric constant of Tellurium-based composite particles was smaller than the relative dielectric constant of substrate with silicon as the main component when control voltage is -0.8V in reaction time of 200s. The optical band gap was estimated to be 3.14eV by spectrum.
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  XPS study of lithium-6 glass scintillator activated by Ce3+

  . 2012, 43(11): 9-0.

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  Surface structure and valence state of Ce ion changes on lithium-6 glass scintillator which melted in different reducing atmosphere were studied by XPS，Results show that Ce3+ activator wasn’t in glass network structure but distribute in network gap；Oxygen ion exist in bridging oxygen and non-bridging oxygen forms，and the number of non-bridging oxygen reduced as reducing atmosphere enhanced； Relative content of Ce3+ and Ce4+ could be calculated semi-quantitatively by XPS，it can provide important theoretical reference to further optimize the preparation of lithium-6 glass scintillator.
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  Fabrication and Characterization of Single Crystal PMnN-PZT Ferroelectric Thin Film

  Tao ZHANG;;;;

  . 2012, 43(11): 10-0.

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  The ternary compound ferroelectric thin films, 6% Pb(Mn1/3, Nb2/3)O3- 94%Pb（Zr0.45, Ti0.55）O3(PMnN-PZT), are deposited on the MgO substrates by the magnetron sputtering method, and the quench method is adopted for the post heat treatment. The out-plane and in-plane X-ray diffractions are used to characterize the crystal structure of the PMnN-PZT thin films, and the highly accurate scan electron microscope is used to observe the surface and the cross section surface of the thin films. It can be obtained that the PMnN-PZT thin films own single crystal structure and perovskite phase.
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  Contrast on optical properties of TiO2 films deposited on different substrates

  Jian YE

  . 2012, 43(11): 11-0.

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  ABSTRACT: TiO2 thin films were deposited on Si and quartz substrates via radio-frequency magnetron sputtering and post annealed at different temperatures for 1 hour. The transmittance and ellipsometric spectra of the films were obtained. The optical constants of the films deposited on different substrates were extracted by fitting the transmittance and ellipsometric spectra, and found obviously different from those of TiO2 bulk material. The band gaps of the films were also determined and the values vary from 3.35 to 3.88 eV.
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  Preparation of Ag nanoparticles located P(St-co-MMA) composite microspheres by UV light

  wanbin xiong;;;chen ming qing

  . 2012, 43(11): 12-0.

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  P(St-co-MMA) microspheres were prepared by photoinitiated dispersion copolymerization of styrene (St) with methyl methacrylate (MMA) in a mixture of ethanol and water (Vethanol/Vwater=7/3) using 2,2-Dimethoxy-2-phenylacetophenone (BDK) and polyvinylpyrrolidone (PVP) as the initiator and stabilizer, respectively. The effects of reaction time, the monomer ratio of St and MMA, amount of PVP and light intensity on the yield and diameter of P(St-co-MMA) microspheres were studied. Ag+ ions were reduced to silver by UV light using AgNO3 as metal sources in the presence of P(St-co-MMA) microspheres. At the same time, Ag nanoparticles were located to the surfaces of P(St-co-MMA) microspheres. The resulting composite microspheres were characterized by transmission electron microscopy (TEM), laser light scattering (LLS) and X-ray diffractometry (XRD). It was found that the diameter of P(St-co-MMA) microspheres can be controlled in range from 500 to 800 nm. The composite materials of silver nanoparticles/ P(St-co-MMA) microspheres were successfully synthesized. The mean diameter of silver nanoparticles was about 20 nm., P(St-co-MMA) microspheres were prepared by photoinitiated dispersion copolymerization of styrene (St) with methyl methacrylate (MMA) in a mixture of ethanol and water (Vethanol/Vwater=7/3) using 2,2-Dimethoxy-2-phenylacetophenone (BDK) and polyvinylpyrrolidone (PVP) as the initiator and stabilizer, respectively. The effects of reaction time, the monomer ratio of St and MMA, amount of PVP and light intensity on the yield and diameter of P(St-co-MMA) microspheres were studied. Ag+ ions were reduced to silver by UV light using AgNO3 as metal sources in the presence of P(St-co-MMA) microspheres. At the same time, Ag nanoparticles were located to the surfaces of P(St-co-MMA) microspheres. The resulting composite microspheres were characterized by transmission electron microscopy (TEM), laser light scattering (LLS) and X-ray diffractometry (XRD). It was found that the diameter of P(St-co-MMA) microspheres can be controlled in range from 500 to 800 nm. The composite materials of silver nanoparticles/ P(St-co-MMA) microspheres were successfully synthesized. The mean diameter of silver nanoparticles was about 20 nm.
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  Study on the Fabrication and Thermal Performance of Aluminum Substrate for High Power LED

  . 2012, 43(11): 13-0.

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  Insulation layer of aluminum substrate for LED Encapsulation was made by hard anodizing technology. The impact of oxidation time, concentration of oxalic acid, sulfuric acid and current density on thickness and breakdown voltage was studied. Then optimum parameters of low thermal resistance aluminium substrate were obtained:current density was 3A/dm2, concentration of oxalic acid was 10g/L, concentration of sulfuric acid was 150g/L, oxidation time was 45min. AFM was used to observe crack initiation after thermal shock The result shows that aluminum plate has small cracks which does not affect the insulation performance. By testing thermal resistance, we find that the composite thermal resistance of Al and Oxide film is 1-3℃/ W. The result shows that the oxide film prepared by anodic oxidation technology meet the requirements of LED substrate.
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  Characterization and Preparation of β-FeSi2 /Si Hetero Structure

  Xu ZHENG;ZHANG Jin MinXIONG Xi Cheng ;;

  . 2012, 43(11): 14-0.

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  Hetero structures of β-FeSi2/Si were prepared by DC-magnetron sputtering and vacuum annealing. Firstly, Fe film was deposited on n-type Si(100) substrate at room temperature, subsequently annealed in a vacuum furnace to form β-FeSi2/Si hetero structure. The thickness of Fe and β-FeSi2 was 238 nm and 720 nm, respectively. The crystal structure, surface topography and Optical properties of the β-FeSi2 film were characterized with x-ray diffraction (XRD), scanning electron microscope (SEM) and infrared Spectrometer. The electricity and transport properties ofβ-FeSi2 film were measured by Hall Effect. The results indicated that β-FeSi2 film with n-type conducting, the electron concentration was 9.51×1015 cm-3 and the mobility of electrons was 380 cm2/V?s.
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  Preparation and pH-Sensitive Drug Delivery Study of mPEG-poly(Morpholine Propyl-Asparagine)-poly(L-Alanine)

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  . 2012, 43(11): 15-0.

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  In this study, a novel biodegradable ABC type triblock copolymer mPEG-poly(benzyl L-aspartate)-P(L-Alanine) was synthesized by N-carboxyl anhydride ring-opening polymerization. Morpholine groups were tethered to the side chains of poly(L-Asparagine) segments by aminolysis. mPEG-poly(Morpholine Propyl-Asparagine)-poly(L-Alanine) nanoparticles were prepared and used as carriers for tumor-targeting drug delivery. Doxorubicin(DOX) was encapsulated in the nanoparticles to explore the release pro?le. These DOX-loaded polymeric micelles exhibited rapid release of DOX from the micelles in weakly acidic environments but very slow release under physiological conditions (pH 7.4). This is most likely due to protonation and a change in hydrophilicity of the morpholine groups in the poly(L-Asparagine). This new approach may serve as a promising platform to formulate targeted drug delivery systems.
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  A study on MnOx/graphene composites as anode materials for lithium ion batteries

  Yun-Lei GAO

  . 2012, 43(11): 16-0.

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  The precursor of Mn hybrid material was synthesized by a modified Hummers method and MnOx/graphene composites were obtained through a reduction in nitrogen and hydrogen atmosphere at 400℃. The composite material was investigated as anode materials for lithium ion batteries via scanning and transmission electron microscopy (TEM), X-ray diffraction (XRD) and a variety of electrochemical testing techniques. Experimental results showed that nano-particles of manganese oxide were well dispersed on the surface of graphene sheets. The first reversible capacity of the prepared composite was as high as 876mAh/g at current density of 50mA/g. After 30 cycles, the reversible specific capacity was still maintain at more than 700mAh/g.
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  Preparation of Gelatin-Chitosan Composite Dermis Scaffold with Bi-crosslinking System and Study on the Properties

  ;;Gong Mei;;;;

  . 2012, 43(11): 17-0.

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  1- ethyl -(3- dimethylaminopropyl) carbodiimide hydrochloride (EDC?HCl) and sodium tripolyphosphate (STPP) as the covalent and ionic bi-crosslinking agents were introduced to prepare gelatin-chitosan (Gel-CS) composite porous scaffolds. The structure and morphology of the scaffolds were characterized by Fourier transform infrared spectrometer (FT-IR) and scanning electron microscope (SEM), and also the porosity, mean pore size, swelling properties and degradation were studied. In addition, the cross-linking mechanism was analyzed.The results show that covalent and ionic cross-linkage have taken place between the two phases of Gel and CS in the composite porous scaffolds; these scaffolds have interconnected pores and high porosity, and the mean pore size is in the range of 136.1-182.9μm; the swelling properties of the scaffolds prepared by covalent and ionic bi-crosslinking are better than that of single covalent cross-linking, indicating that the cross-linking degree of covalent and ionic bi-crosslinking is higher than that of single covalent cross-linking. The degradation experiments show that, if STPP is constant, the degradation properties of scaffolds become better with EDC increaseing; if EDC is constant, 0.5% STPP can produce the scaffold with the best degradation property.
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  Preparation and characterization of P(MMA-co-DMAEMA)/PVDF separators for lithium battery

  Wei-Dong LIU;;;;

  . 2012, 43(11): 18-0.

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  Lithium ion conducting membranes based on porous separators are the key materials for high performance lithium ion batteries. In this paper, the amphiphilic copolymers of poly(methyl methacrylate-co-dimethylaminoethyl methacrylate) (P(MMA-co-DMAEMA)) were synthesized through a conventional radical polymerization. Using these copolymers as additives in casting solutions, the PVDF/P(MMA-co-DMAEMA) porous blend membranes were prepared following a typical non-solvent induced phase separation (NIPS) process. Compared with pure PVDF separator with comparable porous structure, the adoption of P(MMA-co-DMAEMA) could not only decrease the crystallinity, but also enhance the stability of entrapped liquid electrolyte. Such modi?ed PVDF membrane should be named as “active separator”, which can exhibit the charactreristic of gel electrolyte by absorbing lithium salt liquid electrolyte. For separators with PVDF/P(MMA-co-DMAEMA) mass ratio in 10/1, the liquid electrolyte uptake reached above 420wt% and ion conductivity of the membrane was 1.8 × 10?3 S/cm, which was acceptable for high voltage lithium ion batteries. These results primarily indicate the potential of the prepared blend separator in real application in safe and high performance lithium ion batteries.
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  Study on the modulation of TiO2 photoanode of dye-sensitized solar cell by ZnO

  . 2012, 43(11): 19-0.

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  TiO2 films, TiO2-ZnO composite films and TiO2/ZnO double films as photoanode of dye-sensitized solar cell were prepared by screen-printing technique, and the modulation effect of ZnO on the TiO2 photoanode was studied. The results of the study indicate that conversion efficiency of the solar cell with TiO2-ZnO composite films photoanode prepared with Zinc acetate doped is higher than that of with no doped by 1 times, and because of the um magnitude of the large size of ZnO, its composite photoanode make the conversion efficiency of the solar cell decrease. The conversion efficiency of the solar cell with TiO2/ZnO double films photoanode prepared from Zinc acetate as raw material is higher than that of without ZnO film layer by 13 times.
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  Preparation and electrochemical properties of Polyaniline nanorods doped with sulfosalicylic acid

  ;Yu -Ying ZHENG;;Bao-Ming LI

  . 2012, 43(11): 20-0.

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  Polyaniline nanorods doped with sulfosalicylic acid were prepared by chemical oxidization polymerization with aniline as monomer and ammonium persulfate as oxidant. The influence of mono mer/dopant mole ratio on the electrochemical properties and morphology of synthesized polyaniline. The structure of Polyaniline was characterized and studied by FT-IR spectrometric and XRD analysis. Four-point and Electrochemical System analysis show that conductivity of polianiline nanorod increase as the increase- ment of dopant/monomer mole ratio and it reached to 1.43S/cm as the dopant/monomer mole ratio is 0.5. SEM and TEM images indicate that typical nanorods are rough with diameter of about 100~200nm and length of about 400-700nm , respectively. Small 10-25nm granular nanoparticles appear to agglomerate onto the available nanorod surface. At last, the probable formation mechanism of polyaniline nanorod is proposed.
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  Hydrothermal synthesis, characterization and properties of lead chromate 1D nanomaterials

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  . 2012, 43(11): 21-0.

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  Single-crystalline PbCrO4 nanorods and nanowires have been successfully synthesized by a simple aqueous solution method without using any surfactant. The length and aspect ratios of the PbCrO4 1D nanostructures could be easily manipulated by only changing the reaction temperature. The morphology and structure of the products were systematically studied by means of XRD, SEM, TEM, HRTEM, and so on. The optical properties of the products were also investigated in detail.
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  Evaluation of New Thiol-acrylic System

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  . 2012, 43(11): 22-0.

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  Three acrylates and two mercaptans were selected as formulations of thiol-ene photopolymerization system. RT-FTIR was used to monitor the curing processes of different formulations. Various performances, including shear strengths, hardness and refractive index of different compounds were measured, respectively. The relationship between performances and formulations were discussed. The results showed that: THEIC sample displayed the highest crosslink density; double bond conversion reach 100%; shear strength and shore D hardness also reached highest, showing 7.95MPa and 58.0, respectively. While, the thiol conversion of THEIC sample was lower than that of DCPDA sample, which exhibited 53.54%. It could be attributed to that fewer double bond of THEIC reacted with thiol than DCPDA. EBDA sample showed the highest refractive index, led by conjugated structure. In addition, the refractive index of PETMP sample was higher than that of TMMP. These indicated that conjugated structure and sulfur content could help to improve refractive index of samples.
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  The Preparation and Characterization of Hexacyanoferrate/Polyaniline

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  . 2012, 43(11): 23-0.

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  In this paper, Polyaniline(PAni), Polyaniline/copper hexacyanoferrate(CuHCF) and Polyaniline/cobalt hexacyanoferrate (CoHCF), Polyaniline/cerium hexacyanoferrate (CeHCF) films were synthesized using the cyclic voltammtry method (CV) in electrolyte solution. In three electrode systems, the work electrode is the indium-tin-oxide (ITO) glass plate electrode, the electrochemical synthesis potential is in -0.3 V～1.1 V and the scan rate of the system is 50 mV/S. And then these films were characterized by CV, FT-IR, TEM, XRD, EDS. These results show: the best thickness of electrolyte solution is(0.02 mol/LAni+0.002 mol/L metal ion+0.01 mol/L K3Fe(CN)6+0.5 mol/L H2SO4). Polyaniline and hexacyanoferrate are bonding together, so that the nature of polyaniline/MHCF have further improved. The micromor-phologies of PAni/CoHCF film is schistose and the electrochemical activity is the same as polyaniline. The particle size of PAni/CuHCF and PANi /CeHCF films is nanometer size and there are more cavitations. The electrochemical activity is better than PAni/CoHCF.
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  Hydrothermal synthesis of K2Ta2O6 and its photocatalysis property

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  . 2012, 43(11): 24-0.

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  In this paper, a series of K2Ta2O6 photocatalysts were prepared by a hydrothermal method using Ta2O5 and KOH as raw materials. The as-obtained samples were characterized by XRD, SEM,UV-vis and so on. The effect of reaction parameters on the crystallization and morphology of samples was investigated such as reaction time, temperature, as well as KOH concentration. The SEM result showed that the particle size was of about 200nm with octahedral shape. That the optimum reaction conditions are as follows: reaction temperature is 180℃，reaction time is 24h, KOH concentration 0.5mol/L.And the performance of K2Ta2O6 photocatalytic on degradation of safranine Twas studied. The result shows K2Ta2O6 prepared has a high photocatalytic activity under ultraviolet irradiation.
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  Study on characterization and flocculation of flocculant based on collagen protein modified by Al(Ⅲ)

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  . 2012, 43(11): 25-0.

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  Under aluminium tanning mechanism in tanning chemical, Al(Ⅲ) was combined on collagen protein which obtained by the hydrolysis of gelatin. So Al(Ⅲ) modified collagen flocculant was prepared. The structure of products and the reaction mechanism are characterized and analyzed by XRD、fluorescence spectrum and XPS. When using the prepared flocculant in the treatment of waste drilling water, the influence of flocculation conditions on the treatment effect was studied by CODcr removal rate and suspended solids content. The result indicated that a coordination reaction occurred between collagen protein and Al(Ⅲ). When used to flocculate waste drilling water, the dosage of the prepared flocculant was 20.7g/L, pH was 6-9 and temperature was 20-40℃. After flocculation, the CODcr removal rate was 80.1% and suspended solids content decreased from 2115mg/L to 190mg/L.
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  Fabrication and luminescence properties of Sm3+/Ce3+/Tb3+ codoped CaO-B2O3-SiO2 glasses

  Zhen-Feng ZHU

  . 2012, 43(11): 26-0.

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  The luminescent CaO-B2O3-SiO2 glasses codoped with Sm3+/Ce3+/Tb3+ have been synthesized by high temperature melting method and the luminescence properties of the samples were investigated by photoluminescence (PL) spectra and CIE chromaticity coordinate. Reddish orange, Blue and green emission bands were observed in the emission spectra of Sm3+/Ce3+/Tb3+ codoped glasses. The combination of these emission bands allows the realization of white light when the glasses are excited by near ultraviolet light. In addition, with the decreasing of the CeO2, the white emission gradually shifted from blue to yellow can be observed in the emission spectra of luminescent glasses with a certain content of Sm2O3 and Tb4O7.
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  Research on Shape Memory Effect and Corrosion Resistance of the Pipe Joint of Fe-Mn-Si-Cr-Ni Base Shape Memory Alloy

  YANG Jun

  . 2012, 43(11): 27-0.

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  Shape memory effect and corrosion resistance of the pipe joint of Fe-Mn-Si-Cr-Ni memory alloy were studied in this paper. The results show that with pre-deformation increasing, shape memory effect of the pipe joint would decline and the recovery of strain was on the rise. When the pre-deformation was more than 5.3%, the range of the rise was not significant. The connected pipe joint was more vulnerable to corrosion in a medium simulated oil field conditions than in a 3.5% NaCl solution. Compared to the unconnected pipe joint, corrosion resistance of the connected joint would decrease in the simulation media. It is due to the surface tensile stress caused by recovery stress and stress induced ε martensite. Moreover, with pre-deformation increasing, corrosion resistance of the connected joint would decrease. It is the result of the combination of recovery stress, pipe joints crack and increase of crystal defect density
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  Research on preparation and property of Silica-Coated HAP Particles

  wang hongxin

  . 2012, 43(11): 28-0.

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  Nanophase hydroxyapatite (HAP) particles were coated with silica via the hydrolysis of tetraethyl orthosilicate(TEOS) .The nanocomposite particles were characterized by transmitssion electron spectroscopy(TEM),scaning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, sedimentation time and zeta potential (ζ) studies.A sequential changes in infrared spectral features characteristic of HAP was accompanied by an increase in features characteristic of silica as revealed by FTIR. The silica coating enhanced the colloidal stability of HAP in aqueous suspensions. This behavior can be explained based on a heterocoagulation coating mechanism in which silica clusters adsorb onto the HAP particle surface.
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  Surface modification via electrostatic self-assembly technique of PA6/HA: Characterization and Cytocompatibility

  Juan Shen

  . 2012, 43(11): 29-0.

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  Surface engineering of hydroxyapatite/polyamide 6 (HA/PA 6) membrane via electrostatic self-assembly of extracellular matrix-like molecules was used to improve its surface biocompatibility. The polyelectrolyte-mediated electrostatic adsorption of gelatin (Gel) and poly(ethylene imine) (PEI) was employed to surface modify HA/PA 6 membrane. The surface chemistry, wettability and surface topography of the coated films with different number of deposited layers were investigated by using WCA measurement, XPS and AFM, respectively. The results indicated that the hydrophilicity of modified membranes was improved, and the modified surface exhibited an increase in roughness. Cell culturing on the gelatin coating HA/PA 6 membrane surfaces showed improved cell spreading and growth.
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  The Properties and Preparation of Styrene Acrylic Emulision/nano-SiO2 with Core-shell structure

  . 2012, 43(11): 30-0.

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  Styrene acrylic emulision(SAE)/SiO2 Core-shell structure hybrid materials was prepared by emulsion polymerization with unsaturated(RNS-D) as a silica component and polyvinyl alcohol(PVA) as polymeric colloid stabilizer. Hybrids were characterized by TEM, FT-IR,The result indicated RNS-D which surface is modified by unsaturated organic compounds was used as a monomer taking part in the reaction completely, The morphology of hybrids latex coats was observed via Scanning Electron Microscope (SEM). The best mechanical properties and water resistance were obtained, the tensile strength was up to 5.5N/mm2 at the same time the elongation at break reached 102%. The incorption of nano-SiO2 has a toughening and reinforcing effect. The water absorption reached lowest value was 12.5%.
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  Recyling of silicon powder from cutting slurry waste using HF etching sedimentation method

  Jia-Yang Li

  . 2012, 43(11): 32-0.

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  HF acid etching sedimentation process was designed to recycling of Silicon from cutting slurry waste in poly-silicon slicing process. The effects of several operational variables on the recovery rate and yield of silicon kerfs were systematically investigated, including HF acid concentration, HF processing time. Also the effects of dispersion time of ultrasonic agitation prior to the HF acid etching sedimentation process were also studied. In considering the acceptable levels of both recovery rate and yield, a product with Si recovery rate of 82wt% and the yield 62% is obtained under the operating conditions by setting HF acid concentration at 2%, HF processing time at 24h , the agitation time at 60 min. It is indicated that through this method we can recycle the Si powder from slurry waste.
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  The Hard magnet/Antiferromagnet exchange coupling effect on the stability of antiferromagnetic FeMn

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  . 2012, 43(11): 33-0.

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  Preparation and Characterization of Bi2Ti2O7 Thin Film on Self-Assembled Monolayer

  . 2012, 43(11): 34-0.

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  Bi2Ti2O7 thin film was prepared on the glass substrate by the self-assembled monolayer (SAM) technique with Bi(NO3)3 and Ti(OC4H9)4 as the raw materials and octadecyltrichlorosilane as the template. The crystal phase composition, microstructure and topography of the Bi2Ti2O7 thin films were characterized by various techniques, including X-ray diffraction, field-emission scanning electron microscopy, energy disperse spectroscopy and atomic force microscopy. The results indicate the pure cubic phase Bi2Ti2O7 thin film is successfully prepared after annealing at 540℃ for 2 h. The prepared Bi2Ti2O7 thin film has a flat, homogeneous and dense surface.
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  Preparation and Characterization of Poly(styrene/ methyl acrylic acid) Microspheres

  . 2012, 43(11): 35-0.

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  Poly (St - MAA) copolymer microspheres were successfully prepared through emulsifier-free emulsion polymerization，employing styrene and methyl acrylic acid as monomers．The microsphere composition，surface morphology，surface potential，particle size and its distribution were characterized by FT-IR spectroscopy，transmission electron microscopy，field emission scanning electron microscopy，potential and nano particle size analyzer．The results showed that the microspheres prepared by the method were uniform and monodisperse．The monodispersed microspheres with the size from 100 nm to 200 nm were obtained．Poly (St - MAA) copolymer microspheres Zeta potential is - 37.2mV，MAA hydrophilic groups and initiator KPS residue interaction improve copolymerization microsphere emulsion stability．
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  Characterization of LiNi0.8Co0.1Mn0.1O2 synthesized via co-precipitation with different precipitants

  Wei-Pan ZHONG ;

  . 2012, 43(11): 36-0.

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  In this article, cathode materials were synthesized via co-precipitation with different precipitants (Na2CO3, NaOH) followed by sintering process. XRD, SEM and electrochemical tests were used to characterize the microstructure, morphology and electrochemical properties of the obtained cathode materials. The results indicated that the cathode material synthesized by NaOH exhibits better layer structure, morphology，charge-discharge performance and rate performance. Its first specific discharge capacity is about 187.9mAh/g, the highest reaches 196.2mAh/g, and the capacity retention rate is about 81.6% after 50 cycles. The cathode material, prepared by Na2CO3, has a lower specific discharge capacity，but has a higher capacity retention rate about 85.3% after 50 cycles.
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  Continuous constitutive model for superelastic shape memory alloy based on Neural network

  Wen-Jie Ren

  . 2012, 43(11): 37-0.

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  One-dimensional loading-unloading tests on superelastic SMA wires are performed at varying strain amplitudes and loading rates to evaluate the effects of strain amplitude and loading rate on the hysteretic behaviors. The combination of the Graesser’s model and the radial basis function neural network (RBFNN) is proposed, i.e. the parameters of the Graesser’s model are acquired from the experimental data, the parameters that are determined by the mathematical expressions, strain amplitude and loading rate constitute the input information of the network, and the output neurons are made up of the Graesser’s model parameters that are not determined mathematically. Numerical simulations indicate that the RBFNN can predict the parameters of Graesser’s model accurately, and the simulated stress-strain curves by the RBFNN-Graesser’s model agree with the results of the Graesser’s model very well.
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  Synthesis and Characterization of nickel-based Aerogels

  . 2012, 43(11): 38-0.

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  The nickel-based aerogel was prepared using polyacrylic acid as an template and nickel chloride as precursor via epoxide addition method. The aerogel has been characterized using field emission scanning electron microscopy(FESEM), high resolution transmission electron microscopy (HRTEM), nitrogen adsorption/desorption analysis and powder X-ray diffraction (XRD). The results indicate that the nickel-based aerogel has a typical three dimensional structure made up of spherical particles with an open porous network and has high surface area about 192 m2/g. The X-ray diffraction (XRD) patterns show that the aerogel prepared at room temperature belongs to amorphous material. The sample was calcined at 400℃ to obtain a crystalline nickel oxide aerogel.
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  Studies on CO2 sorption properties of TEPA-AM modified mesoporous materials

  Xiao-Yun ZHANG

  . 2012, 43(11): 39-0.

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  Abstract: CO2 adsorption materials were prepared through loading AM-modified tetraethylenepentamine (TEPA) in mesoporous silica pore channels. The materials were characterized by XRD, N2 physisorption techniques(BET) and FT-IR. The capacity of CO2 adsorption and desorption were measured and evaluated by comparison with TEPA-impregnated material. The results showed that a novel mesporous material with low structural order could disperse TEPA-AM well. Its CO2 sorption capacity reached up to 159.1 mg/g with 60% TEPA-AM loading. The hybrid material exhibited satisfactory performance during 12 turnovers.
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  Effects of Sintering on Magnetic Properties of MnZn High Initial Permeability Ferrite from Coprecipitation-preroasting Powders

  . 2012, 43(11): 40-0.

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  The influence of sintering conditions on the magnetic properties of MnZn high initial permeability ferrite from coprecipitation-preroasting powders were studied and phase composition and microstructure of samples were investigated by XRD and SEM. The results show that the initial permeability increase, with the increased sintering temperature, and an increase of its frequency characteristic with increasing oxygen partial pressure is observed. When the sintering temperature is 1380℃ and the oxygen partial pressure is 3.5%, all the magnetic properties come to the best. The initial permeability can reach more than 13000 and is mainly unchanged to 150 KHz. The study indicates that appropriate sintering conditions can promote the growth of gains, reduce the amount of pores, increase the sintering density and coercive force, the grain boundary became thinner, consequently increase initial permeability and improve the frequency characteristics.