15 March 2013, Volume 44 Issue 05
    

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    综述·进展
  • Recent Development on Surface Modification of Artificial Disc Material for Wear resistance
    WANG Song;LIAO Zhen-hua;LIU Yu-hong;LIU Wei-qiang
    . 2013, 44(05): 609-613.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Generally titanium alloy and ultra-high molecular weight polyethylene (UHMWPE) are software materials in artificial disc joint material pairing, so their surface modification is important to improve the wear resistance and long-term stability of the prosthesis. The recent development to improve surface hardness and wear resistance of the titanium alloy by using heat treatment, micro-arc oxidation, surface infiltration elements, plated DLC films, laser surface modification and ion implantation technology are reviewed. Then the research to improve surface hardness and wear resistance of UHMWPE by plating DLC films are introduced. At last, the future trends of the artificial disc prosthesis wear resistance are analyzed.
    • 研究·开发
  • Study of In-doping on the Ferroelectric Properties of PZT Piezoelectric Ceramics
    ZHU Bin;WEN Zhong;GAO Yang;YANG Tao
    . 2013, 44(05): 614-617.
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    Pb(ZrxTi1-x)O3(PZT) piezoelectric ceramics doped with In2O3 were studied. X-ray diffra-ction, scanning electron microscopy, LC2000 ferroelectric tester were used to study the effect of phase of ceramics, microstructure and ferroelectric properties. The results showed that the grain size of the PZT ceramics doped with proper amount of In2O3 was inhibited and homogenized, with the increasing amount of doping, the material with the phase boundary is reduced in the quasi-three-phase and increased in tetragonal. When the amount of In2O3 was 0.1% mol, the PZT ceramics presented most optimal ferroelectric properties: Pr=23.43μC?cm-2, Ec=9.783 KV?cm-1. When the amount of In2O3 was 0.3mol%, the PZT ceramics presented most optimal piezoelectric properties: tanδ=0.023，d33=540pc/N, εr=1513，Kp =0.764，Qm=1819。
  • Effects of pulsed magnetic field treatment on the magnetic properties for nanocomposite Nd8.5Fe77Co5Zr2.7Ga0.6B6.2 alloy
    TAN Xiao-hua;ZHANG Shi-yan;XU Hui;HOU Xue-ling
    . 2013, 44(05): 618-622.
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    Effects of the pulsed magnetic field treatment on the microstructure and magnetic properties for nanocomposite Nd8.5Fe77Co5Zr2.7Ga0.6B6.2 alloy are investigated. The results showed that the magnetic annealing results in a refined microstructure and an enhanced exchange coupling between magnetically hard and soft phases. The optimal magnetic properties of iHc＝586 kA/m, Jr＝1.01 T and (BH)max＝138 kJ/m3 are obtained for nanocomposite Nd8.5Fe77Co5Zr2.7Ga0.6B6.2 ribbons annealed with a pulsed magnetic field at 670℃ for 4 min. The (BH)max has an increase of 15% in comparison with that of samples without magnetic annealing.
  • Study on high temperature deformation behavior of Cu-Ni-Si-Ag alloy
    ZHANG Xin;ZHANG Yi
    . 2013, 44(05): 623-626.
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    High temperature compressive experiments ofCu-Ni-Si-Ag alloy at 0.01s-1~5s-1 and 600℃~800℃ were performed. The results show that When the deformation temperature is 750℃ and 800℃, the flow stress decreases after a peak value,showing continuous dynamic recrystallization.The hot deformation activation energy Q,and constitutive equation were obtained from the correlativity of flow stress,strain rate and temperature. With consideration of the effects of the deformation temperatures and the stain rates, processing maps were established based on the dynamic material model.The hot deformation characteristics and microstructures were also analyzed by the processing maps.
  • Microstructure and properties of anatase TiO2 codoped with N and La
    ZHANG Jin;ZHU Qi-zhong;GAO Pan;LIU QIng-ju
    . 2013, 44(05): 627-631.
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    Abstract: The crystal structures, electronic structures and optical properties of N or/and La doping anatase TiO2 were calculated by first principles with the plane-wave ultrasoft pseudopotential method based on density functional theory. The results show that the octahedral dipole moments in TiO2 increase due to the changes in lattice parameters, bond length and charges on atoms, which is very effective for the separation of photoexcited electron-hole pairs and the improvement of the photocatalytic activity of TiO2. The narrowing band gap results in the red shift of optical absorption edges, and N+La codoped TiO2 manifest greater absorption in visible-light region.
  • The effect of ambient temperature and humidity on the stress sensitivity of piezomagnetic film
    LI Xiao-min;ZHU Zheng-hou;ZHOU Jia;HUANG Yu-hong;WU Ju-ying;XIE Wen-shuo;
    . 2013, 44(05): 632-635.
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    A kind of FeCuNbSiB amorphous powder/silicone rubber composite film with 83.3wt% powder content and 200μm film thickness was as the object of study. The effect of ambient temperature and humidity on the stress sensitivity of piezomagnetic film was studied systematically though controlling the ambient temperature and humidity. The results show that the ambient temperature and humidity affect the stress sensitivity properties in a certain extent. The sensitivity properties of |ΔZ| and SI% present fold lines with the increase of the ambient temperature and humidity. The change amplitude value of |ΔZ| and SI% reach maximum at the frequency of 1 KHz and it is decreased with the increase of frequency. At the conditions of 25oC and 40%RH, the FeCuNbSiB amorphous powder/silicone rubber composite film shows the best stress sensitivity properties. The change amplitude value of |ΔZ| and SI% can be reached to 827.37KΩ and 37.36, respectively, at the frequency of 1 KHz ant the pressure stress of 0.13MPa and 1MPa.
  • Soluble poly (pyrrole methane) prepared by ultrasonic irradiation and its fluorescence properties
    LI Bao-ming;CHEN Jing-fen;TU Zhao;WANG Pan
    . 2013, 44(05): 636-639.
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    Soluble Poly{(3-hexanoyl)pyrrole-[2,5-diyl(p-tetradecoxybenzylidane)]} (PHPDTBA) was prepared by ultrasonic irradiation and its structure, thermal stability and fluorescence properties were characterized and analyzed by 1H NMR, FT-IR, UV-Vis, XRD, TG and FL. UV-Vis spectrum showed that PHPDTBA possessed apparent optical absorption at the range of 300-500 nm. PHPDTBA existed mainly in amorphous manner while there was a tiny crystalline region according to XRD spectrum. The thermal weight loss process of PHPDTBA had two phases, the fracture of hexanoyl and p-tetradecoxybenzyl, with the initial decomposition temperature of 195.19℃. PHPDTBA was a sort of deep blue fluorescent material that the Stokes displacement was 77 nm with a fluorescence quantum yield of 0.27 in CH2Cl2.
  • A Study on Degradation about Biomimetic Mineralized AZ91 Mgnesium Alloy and Its Antibacterial Activity against S. aureus
    TIAN Jin-huan;DING Shan;ZHOU Chang-ren;LI Li-hua;ZHANG Peng;JIAO Yan-peng;LI Hong
    . 2013, 44(05): 640-643.
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    The quaternary ammonium salts of chitosan(HACC) were synthesized successfully. Characterization of HACC was analyzed with IR spectra, HNMR Spectroscopy. The four biomimetic coatings were mineralized on the surface of micro-arc oxidation or no micro-arc oxidation sample by adding CS or HACC into the biomimetic solution. The CaP/CS or CaP/HACC coatings were analyzed with scanning electron microscopy( SEM) and X ray diffraction ( XRD) . The weight loss of micro-arc oxidation sample is less than no micro-arc oxidation sample in the phosphate buffered solution for the degradation test. The magnesium ions concentration increases at first then decreases with inductively coupled plasma(ICP), at the same time aluminum ion concentration becomes smaller and smaller. The results of antibacterial assays show that the CaP/HACC coatings have more antimicrobial activity to Staphylococcus aureus than CaP/CS coatings. Antibacterial effect of micro-arc oxidation sample in the biomimetic solution with HACC or CS is higher than that of no micro-arc oxidation sample in the biomimetic solution with HACC or CS. In the above four situations, antibacterial effect can maintain four days with different antimicrobial effect by turbidimetry. Of the four situations, the antibacterial rate of micro-arc oxidation sample in the biomimetic solution with HACC is the highest. The results show that antimicrobial activity of HACC is better than CS. Micro-arc oxidation sample has better corrosion resistant and the stronger drug loading property than no micro-arc oxidation sample.
  • Effect of 60Co-Gamma Irradiation Sterilization on the Stability of Alginate/Chitosan Microcapsules
    ZHENG Jia-ni;XIE Hong-guo;YU Wei-ting;LIU Xiu-dong;XIE Wei-yang;MA Xiao-jun
    . 2013, 44(05): 645-648.
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    Alginate/chitosan/alginate (ACA) microcapsules were sterilized by 60Co-γ irradiation. The stability of ACA microcapsules including morphology, mechanical strength, material composition and degradation was fully investigated. The changes of color, particle size, mechanical strength, composition and molecular weight of ACA microcapsule materials were studied by laser particle sizer, bead grinding method, Fourier Transform Infrared (FT-IR) spectrometer, and Ubbelohde and cone-plate viscometer, respectively. The results indicated that the color of ACA microcapsules became yellow. ACA microcapsules swelled and the fragment increased after irradiation. The mechanical strength of ACA microcapsules decreased due to degradation of materials, and double bond generated because of the free radical reaction. Both molecular weight of chitosan and the apparent viscosity of alginate decreased significantly after 60Co-γ irradiation. Moreover, the degradation effect increased with the molecular weight of chitosan. Decrease of irradiation dosage and enhancement of mechanical strength are possible ways to realize 60Co-γ irradiation sterilization.
  • Crystal Growth Process and Mechanism of Rods Y2O3 Powders Synthesized by Hydrothermal Treatment
    WANG Ying;ZHAO Gao-yang
    . 2013, 44(05): 649-652.
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    Y2O3 nano-and micron-rods were hydrothermal synthesized using yttrium nitrate (Y(NO3)3·6H2O) and ammonia solution at low temperature.The products via the hydrothermal treatment yttrium nitrate were characterized by X-ray diffraction, transmission electron microscopy and scanning electron microscopy. Results show Y2O3 sheets with low crystallinity were obtained with the hydrothermal treatment at 80oC for 4h。Y2(OH)5(NO3)·H2O crystal was synthesized from the unshaped colloidal Y(OH)3-n(NO3)n·mH2O and the composition was changed from Y2(OH)5(NO3)·H2O to Y4O(OH)9(NO3) with higher temperature and higher press. Y2O3 rods with higher crystallinity were obtained at 180oC for 4h. The different shape Y4O(OH)9(NO3) crystal growth process was following the dissoluting-crystallization mechanism and the recrystallization were existed.
  • Synthesis of silver vanadate by liquid-phase direct precipitation method and its photocatalytic performance under visible light
    ZHU Qi-an;WU Yao;HU Nai-gen;NI Bin;SUN Yu-huan;WU Hong-juan
    . 2013, 44(05): 653-659.
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    Using NH4VO3 and AgNO3 as starting materials, Ag3VO4 powders were synthesized by liquid-phase direct precipitation method. The phases, morpholgies and optical properties of the samples were characterized by means of XRD, SEM and UV-Vis techniques. The visible light was used as light source to investigate the photocatalytic activity of Ag3VO4 for the degradation of rhodamine B solution. The results show that the as-prepared samples are monoclinic phase Ag3VO4 when pH values of the reaction mixtures are adjusted to 7. It is also demonstrated that the compositions of the samples are importantly influenced by pH value of the reaction mixture, and the particle size and morphology of the silver vanadate are largely influenced by reaction time, reaction temperature and different surfactants. UV-Vis result indicates that Ag3VO4 has a strong and wide absorption at the wavelength region of 450-800nm, and its energy band gap is 1.88eV. The photocatalytic degradation results indicate that as-prepared samples have a high visible-light photocatalytic activity. The sample obtained at 80℃ for 8h could decolorize rhodamine B solution well, and the degradation rate of rhodamine B is up to 97.7 % after illuminating for 100min under 35W xenon lamp.
  • Study on Structure and Properties of Polybasic Blend PVDF Ultrafiltration Membrane
    MENG Xiao-rong;ZHANG Hai-zhen;HUANG Dan-xi;ZHAO Liang;WANG Lei;WANG Xu-dong
    . 2013, 44(05): 660-664.
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    Effects of adding PVA, PMMA, PVP and their combinations in PVDF/DMAc system on phase inversion process and membrane structure parameters and performance were investigated according to the casting solution viscosity, gel point temperature and dynamic behavior of phase transformation and combined with SEM and AFM techniques, bubble point pressure and hydrophilic contact angle et al means. The results showed that the viscosity and gel point of the casting solution which blended PVA, PMMA and PVDF separately increased, resulting in delayed demixing and slowing down the phase separation and curing speed. The macropores and sponge-like structure in membrane internal were throughout and hydrophilic of the films were better. The PVP and PMMA blending PVDF system produced instantaneous demixing, and liquid-liquid demixing and liquid-solid demixing coexisted, the macropores in membrane internal were transparent and the support layer were dense, showing excellent separation performance. PMMA can effectively improve the surface roughness of the ternary blend films.
  • Characterization of Coated GCC and its Application in the Paper
    ZHANG Hong-wei;YU De-de
    . 2013, 44(05): 665-668.
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    Ground calcium carbonate（GCC）was coated with precipitated calcium carbonate（PCC）by a chemical method. The surface morphology, particle size and size distribution, specific surface area and abrasion value of the coated GCC prepared under different reaction conditions were analyzed. As the filler, the effect of coated GCC on its retention in the paper and the properties of the paper were discussed. The results indicated that the GCC was coated by a fine layer of PCC particles. The edge angles was covered and blunted by PCC particles. Compared with uncoated GCC, the particle size and specific surface area of coated GCC was increased while the abrasion value was decreased. As papermaking filler, coated GCC has a higher retention in paper and lower adverse impact on paper strength properties, furthermore, it brought better optical property to paper. In this research scope, GCC31 which was fully coated has a more smooth shape, more homogeneous particle size distribution, higher specific surface area and lower abrasion value. Concurrently, the ash content in paper was increased by 27.6% and the strength of paper was even increased slightly.
  • Analysis of Pressure-resistance Calculating Model of Carbon Nanotubes/Carbon Black/Silicone Rubber Composite Material
    LIU Xiu-mei;GAO Feng;CAI Wen-ting;LIU Ping;MIU Wei;HUANG Ying
    . 2013, 44(05): 669-672.
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    Abstract: In the paper, flexible pressure sensitive composite materials of silicone rubber filled with carbon nanotubes(CNTs) and carbon black(CB) were prepared. The carbon black filled silicone rubber pressure-resistance calculating model is extended to carbon nanotubes/carbon black/silicone rubber composite materials. The percolation characteristics of carbon nanotubes/carbon black /silicone rubber with different mixing ratio were studied and calculating model was analyzed by the experiment. The results show that in carbon nanotubes/carbon black/silicon rubber system, the lower percolation threshold can be obtained by selecting the appropriate carbon nanotubes and carbon black mixing ratio, the smaller deviation of the experimental results and the calculating curve is got. For the synergistic effects of carbon nanotubes and carbon black in a rubber system and general effective media theory applicable boundary conditions, when CNTs/CB is in a certain mixing ratio, and volume fraction of slightly deviate from near percolation threshold, the experimental results are better consistent with the calculating model curve.
  • Fabrication and field emission characterization of Fe2O3 micro-nanotubes
    . 2013, 44(05): 673-676.
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    The Fe2O3 micro nanotubes were prepared by oxalic acid treatment for several hours and thermal oxidation at 400℃ for 2h. The surface morphology and composition of products have been characterized by Environment Scanning Electron Microscope and X-ray Diffraction respectively. The results of ESEM and XRD showed that the FeC2O4·2H2O micro nanotubes completely transformed to Fe2O3 micro nanotubes, the diameter of about 1μm, thickness of pipe about 100nm. On the top of the micro nanotubes, there were nano tips in diameter of about 20nm. The field emission properties of Fe2O3 micro nanotubes were evaluated that the micro nanotubes had good field emission with low turn-on ?eld (about 2.34V/μm), low threshold field (about 6.80V/μm), high field enhancement factor of 10347 and good luminous effect.
  • Preparation and Characterization of Nanocrystalline Cellulose/Silver Nanoparticles
    WANG Hai-ying;MENG Wei;LIU Zhi-ming
    . 2013, 44(05): 677-681.
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    Nanocrystalline cellulose/silver nanoparticles were prepared by chemical reduction method with nanocrystalline cellulose(NCC) as dispersing agent, sodium borohydride as reductant of silver nitrate. NCC/silver nanoparticles was prepared with 5%(mass ratio) of m(Ag)/m(NCC), X-ray diffraction analysis results showed that crystal form of NCC and silver nanoparticles of NCC/silver nanoparticles did not changed respectively. Grain size of silver nanoparticles of NCC/silver nanoparticles was 11.87 nm, similar to silver nanoparticles diameter (10 nm) measured by transmission electron microscopy(TEM). Thermogravimetric analysis(TGA) results showed that thermal stability of NCC/silver nanoparticles decreased slightly compared with NCC. Transmission electron microscopy(TEM) analysis, UV-Vis absorption spectra analysis, solid content analysis, mechanism analysis, and antibacterial activity analysis results showed that Escherichia coli and Staphylococcus aureus were inhibited and silver nanoparticles of NCC/silver nanoparticles were the best dispersed by NCC/silver nanoparticles prepared with 3% of m(Ag)/m(NCC) .
  • Preparation and Gas Sensing property Studies of CeO2-doped ZnO thick film
    CAO Guan-long;PAN Guo-feng;HE Ping;QI Jing-ai;LIU Wei;ZHENG Wei-yan
    . 2013, 44(05): 682-684.
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    Undoped ZnO, and 6wt%，7wt%，8wt% CeO2-ZnO thick film were prepared by Sol-gel method. Their morphology and structure were characterized by XRD and SEM. The concentrating of dopant was analysized for the preparation effect of CeO2-ZnO.The gas sensors made by the nanopowder were tested by the method of static volumetric. The result indicated that the maximum sensitivity of CeO2-ZnO gas sensor to the saturated acetone vapors reached 9643, and the response and recovery times were 3s and 2s separately when the operation temperature was 85℃. The sensitivity reached 30 in the low concentration (200ppm).The acetone-sensing mechanism of the thick film has been further studied.
  • Study on the removal of model compound of humic acid by cucurbiturils
    Yang Qin;YANG Yong-li;WANG Wen-dong;MENG Xiao-rong;JIANG Yuan-ru
    . 2013, 44(05): 685-688.
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    Removal law of model compounds based on the structural characteristics of humic acid(HA) in wastewater by cucurbiturils was explored by ultraviolet spectrum under the different conditions such as the adsorbent dosage 、contact time、temperature and pH value . The structure of model compounds is the most factors for the removal rate of HA by cucurbiturils and carboxyl groups and the aromatic ring in HA play a decisive role for removal efficiency; the interaction of cucurbiturils and model compounds mainly are physical effects, the adsorption has a wide range pH; in the appropriate experimental conditions, the maximum removal rate of benzoic acid, 2-naphthol, naphthalene, benzyl alcohol and HA are 94.52%，98.24%，81.52%，85.66%，99.85% when adsorbent dose ,the amount of initial adsorbent and equilibrium time are 1.8 g?L-1, 20mg?L-1 and 5h.
  • In situ preparation and resistance properties of waterborne cationic polyurethanes/polypyrrole conductive materials
    WANG Hai-hua;HU Su-juan;SHEN Yi-ding;FEI Gui-qiang
    . 2013, 44(05): 689-692.
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    Abstract: A series of waterborne cationic polyurethanes dispersions (CWPU) was prepared through prepolymerization method by reacting polyethylene glycol (PEG1000) and isophorone diisocyanate (IPDI) with N-methyl diethanol amine (MDEA) as chain extender. Then FeCl3 was employed as oxidant, therefore CWPU/polypyrrole (CWPU/PPy) conductive composite was prepared by in situ chemical oxidative polymerization of pyrrole (Py) in CWPU dispersions. Fourier infrared spectra demonstrated the presence of hydrogen-bonding interactions between CWPU and PPy. The average particle size of CWPU/PPy increased from 10.61nm to 30.29nm compared with pure PU, and corresponding size distribution decreased from 0.850 to 0.346. It was also found that CWPU colloidal particles were uniformly encapsulating by PPy, displaying as spherical morphology, and no aggregation among particles was detected among particles. Results also showed that the surface resistivity of CWPU/PPy composite film surface decreased to 20Ω.cm when Py concentration was 20%, reaction temperature was 40°C, reaction time was 2h and n(FeCl3) / n(Py)=2.0.
  • Synthesis and Characterization of PBMA-b-PDMS-b-PBMA Block Copolymer
    JIANG Yan;SHI Hong-yan;CAI Min;MA Yan-hong;ZHANG Hong-wen;SONG Ren-guo
    . 2013, 44(05): 693-696.
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    A series of poly(butyl methacrylate)-b-poly(dimethylsiloxane)-b-poly (butyl methacrylate) (PBMA/PDMS/PBMA) triblock copolymers had been synthesized by atom transfer radical polymerization (ATRP). Br-PDMS-Br was served as macroinitiator obtained by the reaction of polydimeth]ylsiloxane and α-Bromoisobutyryl bromide and CuCl/2, 2′bpy as catalyst. The products had been characterized by Fourier Transform Infrared (FTIR), H-nuclear magnetic resonance (H-NMR), Gel Permeation Chromatography (GPC), Thermogravimetric Analysis (TGA), Contact Angle, and Scanning Electron Micro Scope (SEM). The results show that the triblock copolymer possesses thermal stability, hydrophobicity and micro phase separation.
  • Preparation and characterization of compound halogen-free flame retardant polyurethane foams
    ZHAO Yi-ping;YAN Jia-jian;CHEN Ding-meng;CHEN Li;DONG Zhi-zhi;FU Wei-gui
    . 2013, 44(05): 697-699.
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    Halogen-free flame retardant polyurethane foams (PUFs) were prepared by filling one or two kinds of N,N'-bis(2-thio-5,5-dimethyl-1,3,2-dioxaphosphorinane) ethane(DDPSN), melamine (MA) and ammonium polyphosphate (APP). The results of limiting oxygen index (LOI) revealed that in the single component flame retardants DDPSN had the best flame retardancy for PUFs. In the two compound flame retardants, DDPSN/MA and DDPSN/APP had excellent synergistic effect, especially DDPSN/APP. The results of tensile test indicated that APP had the best reinforcing effect for PUFs. In the two component flame retardants, DDPSN/APP was the best.
    • 工艺 ·技术
  • A new surface-modified technology of cement mortar using calcium carbonate biodeposition
    ZHU Long-fei;LI Geng-ying;DU Hong;CUI Peng-fei;WU Ya-qing;LIU Hai-feng
    . 2013, 44(05): 700-703.
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    The paper presents a new surface modification of cement mortar using biodeposition involving a method employing Sporosarcina pasteurii (Bacillus pasteurii) bacteria and using cement mortar power as covering layer in this paper. It was possible to obtain reduction in water absorption of cement mortars. The effect was more visible in case of using nutrient medium containing urea, and the coefficient of capillary suction of the treated cement mortar was reduced by 58%. Presence of spherical and columnar Vaterite and Calcite calcium carbonate crystals filling-voids in cement mortar was confirmed by observations under SEM and XRD. The total porosity reduced by 40% was demonstrated by using mercury intrusion porosimetry (MIP).
  • Preparation and Characterization of High Specific Area Activated Carbon by KOH/NaOH activation from abandoned Capsicum Straw
    MA Cheng-yu;MAO Yu;XU Peng-fei;LIU Jian-qi;SONG Xin-shan
    . 2013, 44(05): 704-708.
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    The active carbon with high specific surface area was prepared from capsicum straw by using KOH/NaOH as the activation agent. Studied the activation temperature、activation time、carbonization temperature and KOH / NaOH / C on the adsorption properties through orthogonal test, and the optimum conditions are that the activation temperature of 700℃, the activation time of 80min, and the carbonization temperature of 450 ℃, KOH/NaOH/C for 3:1:1. Microstructure of the sample showed that the activated carbon developed possesses a large apparent surface area (Slangmuir=3270.478 m2.g-1) and average pore size diameter of 3.590nm，larger than the single-KOH activated samples (Slangmuir=3159.200 m2.g-1, D=2.672nm). The morphology and structure of active carbon were observed by SEM and FT-IR, the chemical composition is similar with the sample by KOH/NaOH activation or single-KOH/NaOH activation. The capsicum straw activated charcoal had enriched and developed cellular pore structure, but the sample by KOH/NaOH activation was found more mesopore and some measure of macropore.
  • Fabrication and Properties of porous Al-Si12 alloy
    WANG Jun;ZUO Xiao-qing;YANG Mu-nan;ZHAO Ming-wei
    . 2013, 44(05): 709-712.
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    Porous Al-Si12 alloys with porosity 44～76% and average cell diameter 30～110μm were fabricated by the vacuum - pressure sintering - dissolution processing. The preparation processing, pore structure, bending strength and filtration property of the fabricated porous Al-Si12 alloy were studied. The results show that the bending strength of porous Al-Si12 alloy can be promoted evidently by applying a certain of vacuum sinter pressure, the optimal processing parameters were deduced experimentally as cold pressure 500MPa, sinter temperature 565℃, sinter time 2h and sinter pressure 150～200MPa. With the increasing of porosity and average cell diameter, the relative permeability coefficient of porous Al-Si12 alloy increases. Porous Al-Si12 alloy has a higher bending strength than the similar cell structure porous Al. Compared with the similar cell structure porous stainless steel and porous Al, the porous Al-Si12 alloy possesses a better filtration property.
  • Effect of different purification method on electromagnetic propetries of Multiwalled Carbon Nanotubes
    GE Chao-qun;WANG Liu-ying;LIU Gu;ZHANG Hu
    . 2013, 44(05): 713-717.
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    Multi-Walled Carbon Nanotubes (MWCNTs)were purified using such five different methods as nitric acid reflux, vitriol reflux, nitration mixture reflux etc. Then these MWCNTs were analyzed by TEM, XRD, and FT-IR to study the change of external structure. The complex permittivity and permeability were measured from 2 ~ 18 GHz by the coaxial method. The effect of different purified methods on complex permittivity and permeability were investigated. The results show that amorphous carbon and catalyst particles on the surface of MWCNTs are wiped off effectively, and such functional groups as carboxyl and hydroxylare introduced. Real and imaginary part of complex permittivity both drop, and complex permeability has no substantial changes. To comprehensively survey of the test results, preferably choosing nitric acid reflux treatment process to purify MWCNTs.
  • Preparation of nitric acid-modified titanium ore and its visible-light photocatalytic activity
    LEI ue-fei;XUE Xiang-xin;YANG He
    . 2013, 44(05): 718-721.
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    Nitric acid-modified Titanium ore (NATO) photocatalysts were prepared by the high energy ball milling method at different temperature. NATO photocatalysts were characterized by XRD, FTIR, UV-vis absorption spectra, TG-DTA and PL measurements. Its photocatalytic activity was checked through the photocatalytic oxidation of methyl orange as a model compound under Vis light irradiation. The results showed that: mixed crystal structure was found in NATO photocatalysts; the photocatalytic activities of NATO calcined at 400℃showed a higher catalytic activity compared to other catalysts; the higher concentration of nitrate and the visible absorption capacity，and the suitable phase ratio led to the enhancement of the photocatalytic activities of NATO calcined at 400℃; the decoloration rate of methyl orange reached 100% after 1 h.
  • Preparation and Properties of Superhydrophobic SBR-SiO2 Coatings
    QIAN Li-hai;LUO Yuan-fang;JIA Zhi-xin;JIA De-min
    . 2013, 44(05): 722-726.
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    The superhydrophobic SBR-SiO2 coatings were prepared by particle filling process，in which the precipitated silica was modified with hydroxyl silicone oil (HSO), and SBR was reasonably cross-linked with dicumyl peroxide (DCP). Effects of the contents of HSO, SiO2 and DCP as well as the cross-linking conditions on the film forming property and wettability of the coatings were investigated. The variation of superhydrophobic properties of the coatings after hot air aging and ultraviolet (UV) aging were discussed. The results show that the coating has good appearance without any cracking and water contact angle of the coating reaches 157.0° when HSO/SiO2 mass ratio is 1:1, HSO-SiO2 content is 3.5g, DCP content is 0.25g, the cross-linking temperature is 155℃, and the cross-linking time is 20min. The coatings have good hot air aging and ultraviolet (UV) aging resistances in superhydrophobic property. The micro-nano hierarchical rough morphology observed by scanning electron microscopy (SEM) in combination with the low surface energy of HSO render the coating surface good superhydrophobic property.
  • The growth simulation of Ti thin film onto Si substrate
    WU Qing-ying;CHEN Xiao-long;SUN Ling-guang;LUO Shun-zhong;ZHU Jian-guo
    . 2013, 44(05): 727-730.
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    The initial stage growth peculiarity of Ti thin film onto Si substrate was simulated by a three-dimensional kinetic Monte Carlo model. The simulation results show that the number of initial nucleus of Ti thin film decreased gradually with the increasing of deposition temperature, and the size of the Ti grains gets larger with the increasing of the deposition temperature when the diffusion cut-off step was 50. It was found that the surface root-mean-square roughness of Ti thin film was increased and the relative density of Ti film was decreased with the increasing of the deposition rate. Higher deposition temperature and lower deposition rate is beneficial to the growth of Ti thin film.
  • The Preparation and Characterization of BaTiO3 Coatings Sprayed by Supersonic Plasme Spraying
    WANG Hai-dou;LU Xiao-liang;LI Guo-lu;XU BIn-shi;XING Zhi-guo
    . 2013, 44(05): 731-735.
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    BaTiO3 coating on 45 steel substrate were prepared by High velocity oxy-fuel and plasma spraying, The microstructure morphology and phase composition were analyzed by SEM, XRD and XPS; as well as making the experiment of the microhardness and nanoindentation on the coating. The results show that the surface of the coating was black and smooth, characteristics of porosity is 0.8%; the coatings are typical layer structure, BaTiO3 have mechanical bonding with the substrate, the average value is 42MPa; the nanoindentation equipment test the coating surface hardness was 7.065GPa, elastic modulus is 103.77GPa, Micro hardness reached 648.6HV0.1,therefore the coating show the fine mechanical property; the result of the XRD inflection shown the main phase was BaTiO3, there were three main peaks (101) (111) (200). Through the High velocity oxy-fuel and plasma spraying making coating can obtain a good comprehensive performance.
  • Research on preparation and properties of water-based nano-composite cooling coating
    NIE Yu-jie;JIN Lu-jiang;HANG Jian-zhong;ZHANG Jing;SHI Li-yi
    . 2013, 44(05): 736-739.
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    The water-based cooling coating was obtained with the silicone resin as matrix, and the silicon carbide as cooling functional fillers. The SiC filler contents, the SiC filler particle size and the coating thickness were studied. At the same time, the thermal stability and electrical insulation properties were researched. The results indicate that when the SiC filler particle is 60nm, the addition of SiC is 30% of the mass fraction of matrix and the coating thickness is 42μm, the cooling temperature difference is largest and 11.5℃. In addition, compared to the micron SiC filler, the nano-SiC particles disperse uniformly and bond more closely in the paint film characterized of by SEM images. TGA meastures show that at the 30% of the mass fraction of matrix, the weight loss is less than 0.4% at 200℃, which indicate that it can be used for a long term at about 200℃. The dielectric performance tests show that at the 30% of the mass fraction of matrix, the dielectric constant of the coatings are all not more than 6.0, with good dielectric properties.
  • Fabrication and Properties of Polyimide film with aluminum Oxide Composite Layer via Ion Exchange
    ZHANG Ming-yu;LIU Li-zhu;WENG Ling;CUI Wei-wei;ZHU Xing-song
    . 2013, 44(05): 740-743.
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    Aluminum oxide (Al2O3) composite layer on flexible polyimide (PI) substrate was prepared via an ion exchange technique. Composite film was tested for the mechanical properties，thermal and electrical properties and compared to original film. SEM showed that composite film surface had not visible particle, EDS showed there were Al element in the surface of composite PI film. Mechanical results showed that composite film maintain the excellent mechanical property of original PI film. TG results showed that thermal property of composite film was better than original PI film. Breakdown field strength of composite film was 303kV/mm while original PI film was 291kV/mm. Corona-resistant test results showed that the corona-resistant time of composite film greatly improved compared with original PI film from 8min up to 53min.
  • Effect of high-frequency and low-frequency power of ICP/CCP C4F8/Ar plasma on the textured structure of AZO films
    WU Ming-zhi;JIN Cheng-gang;WANG Fei;HUANG Tian-yuan;WU Xue-mei;ZHUGE Lan-jian
    . 2013, 44(05): 744-747.
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    Thin films of Al-doped zinc oxide (AZO) were prepared on quartz glass substrates by RF magnetron sputtering method. Then the AZO films were post-treated with CCP/ICP C4F8/Ar discharge plasma. Atomic force microscope was used to investigate the textured structure and optical emission spectroscopy (OES) was used to analysis the fluorocarbons content .We found that the increase of the low-frequency power could result in higher content of F which lead to better textured structure. The high-frequency power didn’t have much effect on the textured structure.
  • Study on Preparation and Properties of Thermally Conductive and Insulating PA Composites
    CHEN Ya-fei;YANG Wen-bin;WEI Xia;FAN Jing-hui;ZHANG Kai;DONG Fa-qin
    . 2013, 44(05): 748-751.
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    A kind of thermally conductive and electrically insulating composites were obtained from mixture of flake graphite, silicon carbide whiskers, alumina particles and polycaprolactam (PA6) by melt blending using a twin-screw extruder, and then samples were prepared by compression molding. Morphology, thermally conductive property, insulating property and thermal stability of composites were characterized by scanning electron microscopy (SEM), thermal conductivity analysis instrument, high resistance micro-current tester and thermal gravimetric analysis (TG). The results indicated that the ternary fillers were dispersed homogeneously and formed thermally conductive networks in polymeric matrix. With the increasing of the hybrid fillers content, the thermal conductivity and the initial decomposition temperature of composites were increased gradually, but the surface resistivity and the volume resistivity were declined. When the filler content was up to 50wt%, the thermal conductivity, the volume resistivity and the initial decomposition temperature were up to 1.407W/(m?K), 1.03x1011Ω?cm and 344℃, respectively.
  • The annealing effect of radiochromic film dosimeter
    WANG Shuo;CHEN Jia-sheng;HE Jie;SUN Peng
    . 2013, 44(05): 752-755.
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    Abstract: In this study, I prepared a batch of radiochromic film .It becomes blue after irradiated by low energy density of ultraviolet radiation using CL-1000UV cross-linking instrument .An absorption peak appears at 670nm. The absorption peak absorbance has a good linear response relationship of radiation dose. I did annealing experiments on the film after the irradiation .When the temperature was raised to 45℃, a new absorption peak appeared at 500nm. Along with the further elevated temperature 670nm peak gradually disappeared and 500nm peak rose gradually .When the temperature reached 110 ° C, 670nm peak completely disappeared, 500nm peak to stabilize, and the film is also correspondingly changed from blue to pink .The change of radiochromic film after Irradiation has been expounded by infrared spectroscopy which is that Carbon-carbon triple bond conjugated (colorless) into a carbon-carbon triple bond and carbon-carbon double bond is not in a plane conjugate (blue), into the carbon-carbon triple bond and carbon-carbon double bond in a plane conjugate (red).
  • A new method of fabricating large-area green band double fishnet metamaterials
    LI Sa;CAO Di;WANG Xiao-nong;PAN Zhen-zhen;ZHAO Xiao-peng
    . 2013, 44(05): 756-758.
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    A novel method of emulsion polymerization is designed, and combined with electrochemical deposition to fabricate large-area green band double fishnet metamaterials. After pretreatment to clear away the redundant reagent, this polystyrene emulsion still keep good monodispersion, and can be used to obtain good template of two-dimension colloidal crystal. We find that the double fishnet structures’ electromagnetic resonance have been enhanced through experimental.
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