25 August 2010, Volume 41 Issue 08
    

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    研究与开发
  • ;
    . 2010, 41(08): 1-0.
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    Large area polymer nanostructure arrays were successfully patterned by photolithographic approach using anodic aluminum oxide (AAO) templates. Different factors were discussed in the process of experiments. Finally, the best experiment conditions were confirmed. Polymer nanostructure arrays with different patterns were successfully fabricated by solution-wetting method. Nanotubes were obtained when the solution concentration is 6.0 wt %, while nanowires were formed when the concentration equals to 10.0 wt %.
  • ;Fa-shen Li;zhou jun jun ;;
    . 2010, 41(08): 2-0.
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    A series of nano-magnetic thin films of Ta/FeCoNd/Ta were fabricated on Si <111> substrate by RF magnetron sputtering with various power of Nd target. The structure and magnetic properties of FeCoNd films with Nd concentration and annealing temperature with magnetic field under vacuum were investigated. The as deposited films are amorphous. The size of the FeCo and FeCoNd nano-crystallites increases with the increasing of annealing temperature. The results from vibrating sample magnetometer measurement revealed that the saturation magnetization decreases with increasing of Nd concentration. An in plane magnetic anisotropic property of FeCoNd films was obtained by vacuum annealing with magnetic field. The Ta/Nd20(FeCo)80/Ta sample shows the coercivity of 2.5Oe and 1.7Oe at easy and hard axes respectively and anisotropic field of 102.6Oe, indicating the potential application in high-frequency fields.
  • . 2010, 41(08): 3-0.
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    This paper investigates the effect of technology parameter on properties of high temperature constant modulus FeNi35Co20AlNbTi alloy and analyses the effect of solution process、working process、ageing process on properties,we have achieved suitable process.
  • HOU QING-YU
    . 2010, 41(08): 4-0.
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    Abstract:By the ab-initio study of plane wave ultra-soft pseudo potential technique based on the density function theory (DFT), we calculated the optimization of the geometry structure,energy band structures,total density of states(TDOS),partial density of states(PDOS),Mulilken charge population and the absorption spectrum in the of the pure ZnO and high doped ZnO with N and Al super cell are investigated. In the comparison of the pure ZnO, it is found that the electric structure changes strongly in the high doped ZnO with N and Al.electric P-type transform. strengthen of hybrid orbital, evidence of the charges transfer are found from the result. band gap minish, The effect of red shift occurs with the absorption spectrum, Moreover,that the effect of red shift increases with the concentration of N and Al increasing. The results of calculation be agree with the change trend of experiments result.
  • ; ;
    . 2010, 41(08): 5-0.
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    Abstract: A kind of luminescent POSS-based organic/inorganic hybrid nanocomposite(EMOF-POSS) was prepared by the Pt-catalyzed hydrosilylation reaction of POSS(T8H8) and 2-ethynyl-7-(4-(4-methoxystyryl)styryl)-9,9-dioctyl-9H-fluorene(EMOF) with the high photoluminescence quantum efficiency(ΦFL), and its structure and property were characterized by FT-IR, 1H NMR, 13C NMR, TGA, DSC, UV and PL, respectively. The influence of aggregation effects of EMOF and EMOF-POSS on their electronic absorption and luminescent properties were investigated in detail. The results show that the incorporation of POSS effectively restrains the aggregation effect of organic luminescent chromophores and enhances the photoluminescence quantum efficiency of hybrid. Simultaneously, the resultant hybrid shows significantly improved thermal stability.
  • . 2010, 41(08): 6-0.
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    Resin-based composite fabricated with continuous carbon fiber ribbon,resin solution and thin substrate material , have good sensing performance. Through the four-point bending test of a steel girder with the carbon ribbon composite affixed, We have researched its frequency response, linearity, repeatability, hysteresis and sensitivity characteristics.In the range of 0~72.28MPa with tensile stress, the results show that it has a better effect of force-sensitive, and the average sensitivity achieves about 87.82. It can quantitatively determine the size of the pulsating load.
  • ;LIU Gang ;;
    . 2010, 41(08): 7-0.
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    A phenolic monomers copolymer was synthesized by means of radical copolymerization of p-hydroxybenzoic acid (PHBA) and sulfanilic acid (SAA), and the reaction was catalyzed by horseradish peroxidase (HRP)/H2O2. The effects of polymerization temperature, system pH, amount of monomers and HRP, H2O2 dropwise time and reaction time on structure and properties were investigated. The ideal copolymer was synthesized in 150 ml solution composed of deionized water and phosphate buffer when the molar ratio of PHBA and SAA was 2:1 and the amount of PHBA and SAA was 0.15 mol, and catalyst was HRP/H2O2 at 30 °C for 3.5 h, the amount of HRP was 5 mg, the dropwise time of 17 g 30% H2O2 was 2 h and the pH value was 8.0. The molar yield of copolymer was about 98%. The structure and properties of the copolymer were characterized by FTIR, NMR and GPC, and the mechanism of polymerization between PHBA and SAA was advanced. The applied results show that it has assisting dyeing and retanning properties, application product has desired dyeing effect and excellent softness.
  • ;Qing-Meng ZHANG;
    . 2010, 41(08): 8-0.
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    Glass-ceramics having PbO-Na2O-Nb2O5-SiO2 composition with different Pb contents were prepared; their crystallization behaviour and dielectric properties were studied in this paper. XRD analysis indicates that when heat-treated at 750oC, phase composition in the glass-ceramics turned from cubic pervoskite to pyrochlore with increasing Pb contents; while for galss-ceramics heated-treated at 850oC, tendency of pervoskite phase turned to the co-existence of tungsten-bronze/pervoskite was found. Dielectric peroperties measurement demonstrates that for samples prepared at 750oC, dielectric constant decreases with increasing Pb contents; while for samples prepared at 850oC, the tendency is the opposite. EDS analysis was carried out to analyze the distribution of different elements in the glass-ceramics, and tertiary phase diagram of PbO-Na2O-Nb2O5 composition was utilized to explain the crystallization procedure at different heat-treatment temperatures. It is found that the difference in phase evolution and dielectric properteis can be attributed to the diffrence of crystallization route at 750oC and 850oC.
  • Zhi-Yong Liu ;;;;;;;
    . 2010, 41(08): 9-0.
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    Abstract:The Nickel films were electroplated under external magnetic field with the angle of 35 degree between the cathode and magnetic field. It is revealed that the texture and surface morphology of the films was determined by the current density, texture of substrate and the magnetic field. With the current increasing, the out-of-plane texture changed from the (111) to (200), and the in-plane texture improved. Meanwhile, the size of crystal grain increased. When the current density was relatively low, magnetic field could obviously suppress the (111) orientation and enhance the (200) orientation of the out-of-plane. The in-plane texture became better too. At the same time, the magnetic field could make the sizes of crystal grain smaller and more uniform, the shape of crystal grain more regular. It is also observed that the pinholes on the surface of as-grown films are supressed as well due to the application of magnetic field. The mechanism of the magnetic field, current density and the substrate to the texture and surface morphology have been investigated in the work.
  • Hai-Ting CUI;;
    . 2010, 41(08): 10-0.
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    By using Solidification /Melting models of FLUENT software, the process of heat change on two heat storage balls filled with and not filled with metal foam is numerically simulated. Considered the first kind of boundary condition, temperature field is obtained and phase change interface position changed with time is also calculated. The results indicates that the complete melting time filled with metal foam is greatly shorter than that with paraffin only, enhancing the melting rate of heat storage system. The results got here can provide good references for the numerical simulation of phase change problem and the design of phase change energy storage device.
  • ;;;;
    . 2010, 41(08): 11-0.
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    The miscibility of poly(vinylidene fluoride) (PVDF) and poly(acrylonitrile) (PAN) has been investigated in this article. The PVDF/PAN blend membranes were prepared by wet phase inversion process and the effects of blend ratio on membrane properties were discussed, then the interaction of PVDF and PAN was studied by through FTIR-ATR and DMA. Results showed that the interaction produced by polymers interphase separation increased the permeability of PVDF/PAN blend membrane. The pH-sensitive membranes were then obtained by alkaline hydrolysis experiment of PVDF/PAN blend membrane. The influence of the blend system on pH-sensitive property of membrane flux was also studied.
  • wang yanhang
    . 2010, 41(08): 12-0.
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    Tb3+ doped silicate glasses were successfully fabricated by high temperature melting process, and the effect of irradiation on their microstructures and luminescent properties was investigated in detail. Results showed that part of Tb3+ ions are oxidized to (Tb3+)+ ions and lots of colour centers form in Tb3+ doped silicate glasses after irradiation. The effect of irradiation on the luminescent intensity of Tb3+ doped silicate glasses is evident. The luminescent intensity decreases with the increasing of irradiation dose. However, irradiation damage has little influence on the life of afterglow for Tb3+ doped silicate glasses.
  • LI Jiang feng ;;
    . 2010, 41(08): 13-0.
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    The 9,9′-bianthracene was deposited on SiO2 with dry oxidation by routine vacuum evaporation.The surface morphology of the thin films for 9,9′-bianthracene was investigated by AFM,which was prepared at different substrate temperatures, vapor temperatures and vapor times.The growing model of 9,9′-bianthracene was studied.The mechanism between surface morphology island distribution and growth condition was discussed.At the same,Using the x-ray diffraction analyzed crystal structure.the thin film grown at 50℃ of substrate temperature,180℃ of vapor temperatures and 60 seconds of vapor times has the excellent crystal performance.
  • Wang Nian
    . 2010, 41(08): 14-0.
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    Single-crystalline and pure YVO4 nanorods and YVO4:Eu nanorods were synthesized successfully by a Na2EDTA-mediated hydrothermal method. The resulting products were tetragonal zircon-type structure and characterized using XRD, SEM, TEM, HRTEM and Fluorescence Spectrometer. It was found Na2EDTA and pH value of precursor solution played an important role in determining the morphologies and growth process of YVO4 nanorods and YVO4:Eu nanorods. Due to the strong one-dimension anisotropy, the luminescence properties of the YVO4 nanorods were enhanced evidently. Moreover, the Eu3+ ions doping in YVO4 nanorods led to the better luminescent performances than that of pure LaVO4 nanorods.
  • ;Qinyan Yue;;;;
    . 2010, 41(08): 15-0.
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    Dehydrated sewage sludge, Jinan clay (JNC) and Zibo clay (ZBC) was used in the preparation of ultra-lightweight/ lightweight ceramics without any bloating agent added. The chemical components, mineral phase and thermal behavior of JNC and ZBC were determined by EDX, XRD and TGA, respectively. Physical properties of the two kinds of ceramic prepared in different proportions were tested, respectively. The mineral phase and microstructure of the ceramic were determined by XRD and SEM, respectively. The results shows the JNC was suitable for the preparation of lightweight sludge ceramic, and ZBC is suitable for the preparation of ultra-lightweight ceramic; the chemical components of are similar but mineral phase are different; the physical properties have the different trends with the increase of the addition of SEM sludge, obviously. The mineral phase and microstructure of the ceramic prepared with JNC or Zibo are different because of the different Fe content.
  • GUI Yang-Hai
    . 2010, 41(08): 16-0.
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    Ce-doped WO3 nanoparticles were synthesized by sol–gel method starting from ammonium tungstate hydrate, Cerous nitrate, alcohol, ammonia and nitric acid. The crystal structure and phase of the nanoparticles were characterized by XRD. The results shows a small number of doping Ce can get a single crystal and enhance crystallinity. The morphology of nanoparticles was characterized by Scanning Electrons Microscope and BET. The thermal decomposition behavior of the 5%Ce+WO3 xerogel was investigated by TG-DTA. The results show that as-synthesized nanoparticles contain the adsorbed water and some organic compounds below 450℃. Pure WO3 and Ce-doped WO3 thick film sensors were prepared and tested for specific sensitivity to H2S. Compared to the pure WO3 sensor, Ce-doped WO3 sensors have better ability of anti-humidity during the relative humidity RH=20~70%.
  • . 2010, 41(08): 17-0.
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    Abstract: Mg-doped LaFeO3 powder was prepared by the method of microwave chemical synthesis. The crystal structure and morphologies of Mg-LaFeO3 were characterized. The results show that the LaFe0.7Mg0.3O3 was pure perovskite structure, the dispersive of LaFe0.7Mg 0.3O3 particle is uniform and the particle size is about 20nm. The sensitivity and selectivity of LaFe0.7Mg 0.3O3 for 100 ppm formaldehyde are good, and the response-recovery times are about 55 and 25s, respectively.
  • Ye Min-Hua
    . 2010, 41(08): 18-0.
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    Abstract: Ge nanodot/Si nanowire composite structures were fabricated by combining metal-particle-assisted chemical etching and low pressure chemical vapor deposition, and the microstructures were characterized by SEM, TEM and an united test system of AFM and micro-Raman. SEM and TEM results observed that Ge nanodots uniformly distributed over the whole surface of the Si nanowire. The size and density of Ge nanodots could be controlled by the growth parameters. Micro-Raman demonstrated that the feature peaks of Si and Ge for the individual mesostructure wire, which is extremely shallow and thin, had a large redshift due to the strain and temperature effects.
  • ;;
    . 2010, 41(08): 19-0.
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    Functional self-assembled structure with well-defined shapes and dimensions are of great current interest. Porphyrins are attractive building manifold patterning for these structures because of their electronic, optical, and catalytic properties. In this paper, we report a novel technique for the assembly patterning of polymers. An Electrospinning process was used to create patterning with diameter ranging from 3 μm to 4 μm and length of up to several hundred micrometers in the presence of Mn Porphyrin. Scanning electron microscopy (SEM) were used to characterize the patterning. As a possibly mechanism, the formation of the micro-patterning might be attribute to the hydrogen bonding and the π – π stack in Porphyrin ring(loop).
  • Xiang Tang ;;
    . 2010, 41(08): 20-0.
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    Two novel organic nonlinear optical (NLO) chromophores containing tricyanofuran(TCF) acceptors have been synthesized and characterized by elemental analysis, 1H NMR, FT-IR respectively. Both of the materials exhibited good thermal stability and the decomposition temperature (Td) as high as 311℃ were determined by TGA testing. The UV-Vis absorption spectra suggested the good transparency of the materials. Second-order polarizabilities (β) were calculated using DFT-B3LYP/6-31G method and the β0 values as large as 5.9×10-28esu was obtained.
  • lin qilang
    . 2010, 41(08): 21-0.
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    Carbon beads were prepared by direct pyrolysis of N-phenyl maleimide (N-PMI) modified novolac resin microbeads, and structure and electrochemical properties of the carbon beads were studied in this paper. The morphologies of the carbon beads were investigated through SEM. The structure of the carbon beads was characterized by XRD and specific surface area analysis, respectively. In addition, the constant current charge-discharge properties of carbon beads were studied. The results show that the carbon beads obtained possess fine sphericity and well dispersity with a mean diameter of 11.87 μm. The carbon beads become more stacked and the specific surface areas decrease with increasing heat treatment temperarure. Moreover, the first charge and discharge capacity of the carbon beads decrease with increasing heat treatment temperarure, but the initial coulomb efficiency increases. The carbon beads show better cycling capability with over 90% of coulomb efficiency after 20 cycles.
  • . 2010, 41(08): 22-0.
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    YMnO3 nanorods have been hydrothermally synthesized and characterized by X-ray diffraction, high resolution transmission electron microscopy and selected area electron diffraction methods. X-ray diffraction results indicate YMnO3 nanorods are of pure hexagonal phase. The HRTEM images display that the YMnO3 nanorods with high crystallinity have an interplanar spacing of 0.298 nm corresponding to the (004) interplanar spacing. The results of the XRD and SAED suggest the YMnO3 nanorods have grown along [001] direction. A possible formation mechanism is deduced and discussed. Temperature dependent magnetization curve reveals that uncompensated spin of the surfaces results in a spin glass feature.
  • Jinliang GaoYanghuan Zhang ;;;
    . 2010, 41(08): 23-0.
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    In order to improve the hydriding and dehydriding kinetics of the Mg2Ni-type alloys, Mg in the alloy was partially substituted by element La, and the Mg2Ni-type Mg2-xLaxNi (x = 0, 0.2, 0.4, 0.6) alloys were synthesized by melt spinning technique, and the thin ribbons with a continuous length, a thickness of about 30 μm and a wideness of 25 mm were obtained. The microstructures of the as-spun alloy ribbons were characterized by XRD, SEM and HRTEM. Thermal stability of the as-spun alloy ribbons was studied by DSC. The hydriding and dehydriding kinetics of the alloys were tested using an automatically controlled Sieverts apparatus. The effects of substituting Mg with La on the hydriding and dehydriding kinetics of the melt spun Mg2Ni-type alloys were investigated. The results show that there is no amorphous phase formed in the as-quenched La-free alloy, but the as-quenched alloys containing La holds a major amorphous phase. The substitution of La for Mg raises the glass forming ability of the Mg2Ni-type alloy and the crystallization temperature of the amorphous phase. The hydrogen absorption capacities of the as-spun alloys significantly decrease with rising the amount of La substitution, whereas x = 2, the as-spun alloy (x = 2) displays the largest hydrogen desorption capacity, which is mainly attributed to the modified structure by La substitution.
  • . 2010, 41(08): 24-0.
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    Quaternary ammonium cation cellulose (QACC) was synthesized as a kind of indoor air purification material and then installed in an air purifier. The structure of QACC was characterized. Taking the microorganism as main treatment objective, the purification effect of QACC on indoor air microorganism, formaldehyde and TSP was studied, respectively. The purification mechanism of QACC was discussed. At 25±5℃ and 50% relative humidity, after 12 hours operation of air purifier in a 20m2 room, the removal rates of microorganism, formaldehyde and TSP were up to 82.3%, 41.5% and 98.1% respectively. QACC has significant antibacterial effect, which makes it possible to be installed in air purifier for improving air quality.
  • Dao-Bin Mu
    . 2010, 41(08): 25-0.
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    Abstract: Polypyrrole electrodes were prepared in 0.1M Py-0.1M LiClO4-propylene carbonate (PC) solutions containing different proportion of water (0%, 1%, 2%, 3%, 4%, by volume) through galvanostatic electropolymerization. The electrode properties of polypyrroles synthesized in the solutions containing different proportion of water were investigated with cyclic voltammetry as well as electrochemical impedance spectra (EIS). The morphologies of PPy synthesized in the solutions without/with water (1%) were observed by scanning electron microscope(SEM). Electrochemical performance of PPy electrodes was studied with galvanostatic charge-discharge method. It is shown that the addition of water into polymerization solutions lowers the polymerization potential of PPy, in particular, leads to an improvement of PPy electrode performance. It is found that the PPy electrode electropolymerized under the condition of containing 1% of water displays better electrochemical performance on reversibility, cycleability and charge-discharge efficiency among various PPy electrodes examined in this work, relatively.
  • ZHANG Shou Hua ;
    . 2010, 41(08): 26-0.
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    The power MnZn ferrites were fabricated directly by nano-crystalline powder, and the effect of heating rate and sintering temperature on the microstructure and magnetic properties of power MnZn ferrites was investigated. The results showed that the sintering temperature decreased when the nano-crystalline powder was directly sintered compared with the traditional fabrication method. The high density, initial permeability and low specific loss were obtained at low heating rate. In addition, the fine microstructure and magnetic properties were also obtained at low sintering temperature.
  • duan bo-hua
    . 2010, 41(08): 27-0.
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    With the Carbonyl iron powder and nickel powder as raw materials and a multi-component wax-based polymer as binders, the process and properties of 4J36 Invar alloy fabricated by powder injection molding (PIM) were studied. The results showed that it was facilitate to obtain high-performance PIM 4J36 Invar alloy by improving the sintering temperature or using a suitable sintering atmosphere. Under optimizing the sintering conditions as the sintering temperature of 1350 ℃,sintering time of 120min,sintering atmosphere of hydrogen, the relative density of 4J36 Invar alloy reached 98.1% and its average thermal expansion coefficient from room temperature to 100℃ was only 0.97×10-6℃-1 which is better than that of traditional technique. The microstructure and X-ray diffraction result both showed that the Invar alloy presented with only a single stable austenitite phase (γ phase).
  • jiacheng Gao;
    . 2010, 41(08): 28-0.
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    The objective of this work is the research on the crystal structure of hydroxyapatite(HA) whisker synthesized by hydrothermol method at variable pH conditions. The composition, morphology and structure of hydroxyapatite whisker were characterized by X-ray diffraction(XRD),and field emission scanning electron microscopy (FESEM).The results show that under hydrothermal conditions, hydroxyapatite with uniform morphology and high crystallinity was obtained. With the increase of pH value, grain size of the a-axis direction increases while that of the c-axis direction size basically unchanges, which results in the decrease in the aspect ratio. Also, the morphology of HA gradually changed from needle-like to short rod-like, until ball-like. Within the pH range of 7~8, hydroxyapatite with narrow size scope has been achieved suitable for industrial production. And the growth mechanism of HA was primarily discussed.
  • TONG jian;
    . 2010, 41(08): 29-0.
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    Abstract: Through surface modification of nano TiO2 with aluminum hydroxide and sodium dodecyl sulfate (SDS) in order to improve water slurry of nano TiO2 dispersion.After SDS modified nano TiO2 which surface coated by Al(OH)3,a kind of nano TiO2 slurry has been prepared,which average particle size is 82 nm and over 50 days storage stability.Added nano TiO2 slurry into the anti-corrosion coating,and a variety of properties of coating were improved,and comprehensive performance of coating is best when nano TiO2 adding amount is 2‰.
  • ;
    . 2010, 41(08): 30-0.
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    Copper nanofluids wer obtained by a novel one-step KBH4 aqueous reduction of copper sulfate in water with complex compound EDTA-2Na and quaternary ammonium cationic dispersant CTAB. The mean particle size of the nanofluids with 0.05M CTAB was only 1.02nm measured by dynamic light scatter particle size analyser. The obtained powders centrifuged were pure copper mostly and contained a litter Cu2O analysed by X-ray diffraction instrument, which were influenced by the chemical reaction of complex compounds EDTA-2Na.
  • . 2010, 41(08): 31-0.
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    Using multiple regression orthogonal experiment based on the wrought ironbase superalloy (GH2132) for turning test, analysis of the cutting parameters (including the cutting speed, feed rate, depth of cut) on the surface roughness. Based on principles of probability and statistics and regression analysis, the surface roughness prediction model was established, and the regression equation and regression coefficient significance test conducted for the optimization of cutting parameters and surface quality control provides a basic reference.
  • zhongqiu Hua ;;;
    . 2010, 41(08): 32-0.
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    Undoped tungsten trioxide (WO3) ceramics were prepared by conventional electroceramic technique and effects of quenching and different thermal treatments on the nonlinear I-V characteristics of WO3 ceramics have been investigated. Microstructure analysis by XRD and SEM revealed that there were no obvious differences observed in samples with different thermal annealing atmospheres, however, electrical characterization showed significant changes in the electrical properties. Ceramics quenching in high temperatures and annealing in the Nitrogen showed no nonlinear property and the as sintered and quenched ceramics thermal treatments in the air and oxygen showed distinct nonlinear behavior. Based on the experimental results, it is proposed that nonlinear I-V characteristics of WO3 ceramic may be formed by the potential barriers, resulted from the non-equilibrium defect chemistry process, arising in the cooling period of sintering.
  • . 2010, 41(08): 33-0.
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    The adsorption capability of benzene and toluene in regenerating activated carbon doped ZnO by microwave heating was investigated. The adsorption isotherms of benzene at temperatures of 20℃, 30℃ and 40℃ was measured, and the experimental data were analyzed theoretically by Langmuir isotherm. The adsorptive isotherm of toluene was predicted by Polanyi theory, used the adsorptive isotherm of benzene, compared the results of mathematical computation and experiments data was consistent with the isotherm tested by experiments, and the maximum deviation was not more than 6%.
  • . 2010, 41(08): 34-0.
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    A mullite-fiber-reniforced porous glass matrix composites were prepared by solid-phase sintering. The relationship between the mass of mullite fiber and the microstructure , the flexural strength ,the density as well as the storage modulus were investigated. The structures and fracture surface morphologies of the composites were characterized by XRD and SEM analyses. The flexural property of the composites were tested by a universal testing machine. The storage modulus was tested by a dynamic mechanical thermal analyzer (DMA). The results show that more close pores, whose diameters is more well-distributed in the porous glass. However, too much mullite fiber, will produce numbers of micro-pore. The flexural strength and the density increase with the increase of content of mullite fiber. There is an optimum matching between the specific strength and the mass of mullite fiber. The maximum specific strength is 0.012 m2/s2 when composites contained mullite fiber. The storage modulus decreases after mixing the mullite fiber.
  • ; ;;;
    . 2010, 41(08): 35-0.
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    The shrinkage of archaeological waterlogged wood with loss of a big part of the initial volume of the wooden remains has been considered irreversible. Here we use the active-alkali served as a re-swelling reagent can make the collapsed archaeological wood to be almost fully restored its original shape. The properties and the structure of collapsed wood before and after restoration treatment was analyzed by means of ESEM, FT-IR,XRD. The results show that the maximum re-swelling degree of collapsed wood treated by active alkali-urea increased about 420% comparing to collapsed wood sample, which is near to the volume of waterlogged wood sample.
  • Fang Yu Chao;Y.G. Chen ;;
    . 2010, 41(08): 36-0.
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    Fe-Cr alloy is one of the best candidates for Solid Oxide Fuel Cells (SOFCs) interconnect application, but there are still some problems limiting its application, such as high-temperature oxidation rate and thermal expansion coefficient (TEC), etc. The TEC, area specific resistance (ASR) and high-temperature oxidation characteristic of Fe-21Cr alloy were investigated by adding W or Mo which has small TECs. The results show that the TEC of Fe-21Cr alloy can be reduced and its high-temperature oxidation resistance can be improved with reasonable addition of W or Mo.
  • ;;;;
    . 2010, 41(08): 37-0.
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    Al-doped ZnO (AZO) thin films with different Al contents were deposited on glass substrates using the radio frequency reactive magnetron sputtering technique. The crystallinity, surface images and optical properties in AZO films were systematically investigated by X-ray diffraction (XRD), scanning electronic microscopy (SEM), and fluorescence spectrophotometer. As the Al-doping content increased, the intensity of (002) diffraction peak first decreased and then increased, and there occurred new weak (100), (101) and (110) diffraction peaks, which indicated that AZO films were polycrystalline with a structure that belonged to the ZnO hexagonal wurtzite type. While the surface roughness of the AZO films was smoother and the crystal grains of AZO films was more even. All films had an average optical transparency over 90% in the visible range, meanwhile the optical band gaps first increased then decreased as Al content further increased. The optical band gaps calculated based on the quantum confinement model are in good agreement with the experimental values.
  • . 2010, 41(08): 38-0.
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    Single phase powder of Bi0.8La0.2FeO3 has been synthesized. Using La0.7Sr0.3MnO3(LSMO) as electrode, (Bi0.8La0.2FeO3)0.8-(NiFe2O4)0.2 (BLFO-NFO) thin films were grown on SrTiO3(100) substrates by pulse laser deposition . X-ray diffraction and Field emission scan electron micrograph studies confirmed the epitaxial growth (100) of the films and the particle size of 70nm, respectively. The ferroelectric and ferromagnetic hysteresis of the films have been measured respectively with a standardized ferroelectric test system (RT- 66A, Radiant technologies) and vibrating sample magnetometer (VSM). The results show that the films (Bi0.8La0.2FeO3)0.8-(NiFe2O4)0.2 (BLFO-NFO) thin films behaved the saturation polarization and magnetization respectively.
  • ;;
    . 2010, 41(08): 39-0.
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    As a porous functional material, metal rubber has many characteristics make it more suitable as a filter. Filtration rating is a key performance index for filters, based on which the classification and utilization was made. Hence, it is necessary to investigate the filtration precision of metal rubber and its influencing factors. In this study, a hydraulic diameter formula of metal rubber filters was firstly derived by the introducing of the capillary bundle model based on the pore structure reasonable simplification. Then the relationship of filtration precision and hydraulic diameters was described by the metal rubber filtration precision formula based on the multi pass tests. The results indicated that the filtration precision formula could exactly express the filtration precision influencing factors and their mutual relations which provide a strong theoretical foundation for the metal rubber filter design.
  • . 2010, 41(08): 40-0.
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    A novel class of poly(aryleneethynylene) derivatives were synthesized by Pd(PPh3)4 /CuI via cross coupling between the large band-gap monomer, 1,4-diethynyl-2,5-bis(n-dodecyloxy)benzene (PE), and low band-gap monomer, 3,6-Bis(2-thienyl)pyridazine(TPD), in the medium of tetrahydrofuran and diisopropylamine. These polymers are soluble in common organic solvents and possess good film-formability due to the decoration of flexible oxyalkyl chains. The UV-vis absorption, photoluminescent and electrochemical properties of the resulted copolymers are studied here. The quantum efficiency of the copolymers are 51 %~61 % in THF. Absorption onsets and emission maxima of these polymers are significantly red-shifted along with the increase of TPD’s fraction in polymers’ backbones. The maximum emissions of copolymers’ films peak at 540~551 nm.
  • TANG Yu
    . 2010, 41(08): 41-0.
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    The dielectric constant and micro-defect information of the ZnLa2xNb2(1-x)O(6-2x) microwave dielectric ceramics with different La2O3 content can be obtained by measuring the dielectric constant, positron lifetime and coincidence Doppler broadening spectra. The influence of La2O3 doping on the microdefects and dielectric constant of ZnNb2O6 has been studied. The experiment results show that for ZnLa2xNb2(1-x)O(6-2x) dielectric ceramics with low La2O3 content (x?0.20), with the increase of La2O3 content, the mean positron lifetime ?m and the concentration of defects decrease, while the density, the peak of the ration curve and the dielectric constant increase. The mean positron lifetime ?m and the concentration of defects reach minimum values, while the density, the peak of the ration curve and the dielectric constant reach maximum values at x=0.20. For x ?0.30 sample, the mean positron lifetime ?m and the concentration of defects increase, while the density, the peak of the ration curve and the dielectric constant decrease.
  • ;; ;
    . 2010, 41(08): 42-0.
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    Hydroxypropyl cellulose propionate (PPC) could be synthesized by esterification with hydroxypropyl cellulose (HPC) and propionyl chloride. The chemical structure and morphology of the PPC were characterized by IR, NMR and polarizing optical microscopy (POM), respectively. It was found that PPC (degree of substitution = 2.06) display in the form of cholesteric liquid crystal around the body temperature of 37℃. PPC/polyvinyl chloride (PVC) blend films with different liquid crystal content were prepared by solvent evaporation, and their protein adsorption at 37℃ was measured by Coomassie brilliant blue method using bovine serum albumin (BSA). The results showed that the addition of PPC liquid crystal could significantly reduce the protein adsorption amount of BSA on the PPC/PVC blend films, and the protein adsorption of blend films was affected by not only the content of PPC liquid crystal but also the morphology of liquid crystal domain. PPC liquid crystal may provide an alternative strategy for the development of anti-biofouling polymeric materials.
  • LI Gui-Jin
    . 2010, 41(08): 43-0.
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    Nanocrystalline NiFe2O4 powders were synthesized by citric acid sol-gel auto-combustion method. The phase variation regularity of auto-combustion powders through heat treatment at different temperature was analyzed by using XRD technique. Auto-combustion powder and heat treatment samples were characterized by SEM、TEM、and IR techniques. Furthermore, electromagnetic parameters and loss properties of both within 2~18GHz were studied comparatively. The results indicate that auto-combustion powders are mainly composed of NiFe2O4 with a little FeNi3 and α-Fe2O3. With increasing of heat treatment temperature, Impurity phases successively disappear at 600℃ and 950℃. Heat treatment can effectively impel crystal boundary migration, and results in crystal growth. Auto-combustion powder posses FeNi3 phase、distorted crystal structure and complex interface condition, which result in its special IR spectra and superior characteristics of the electromagnetic loss.
  • . 2010, 41(08): 45-0.
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    The martensitic transformation and the internal friction was investigated for TNCH titanium alloy by using the X-ray diffraction, the scanning calorimeter (DSC) and dynamic mechanical analyzer( DMA) , as well as the relationship between them. The results showed that the TNCH alloys in the low-frequency range at room temperature had gone through three stages: low-temperature martensite, two-phase coexistence state and the mother phase state. First, the high damping properties of TNCH alloy were mainly induced by monoclinic martensitic phase (B19')and twin interface. The second is that the damping characteristics during the phase transformation is concerned with the quantity of phase interface in new / old phase. The damping properties originated from the crystal dislocation when the alloy was in mother phase state.
  • . 2010, 41(08): 46-0.
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    Calcium alginate hydrogels is an appealing scaffold material because it is structurally similar to the extracellular matrix of many tissues, can often be processed under relatively mild conditions and may be delivered in a minimally invasive manner. In this paper, sodium alginate (SA), calcium carbonate, Glucono-Delta-Lactone (GDL) were selected as the materials to prepare the injectable calcium alginate hydrogel using in-situ transformation method. The influences of different concentrations of SA, f value (f = Ca2 +/ COO -), n value (n =Ca2 + / GDL) on the hrdrogel mechanical strength, swelling ratio and pH value of the leaching liquor were investigated and the optium gelation condition was finally determined as following: concentration of SA 2.5%, f = 0.5, and n = 0.6. In addition, the chondrocytes were seeded homogeneously in the gel by in-situ cell culture and were analyzed by live-dead staining after 1,3 and 5 days. Results showed that the cell activity was high and the chondrocytes morphology was well maintained ,which overcomed the deficiency that chonddrocytes tend to differentiate to fibroblasts at one-dimensional or two-dimensional culture. The results further confirmed that calcium alginate hydrogel is an potential injectable scaffolds materials for cartilage tissue engineering.
  • . 2010, 41(08): 47-0.
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    CoCrMo alloy was modified by high frequency and low voltage plasma immersion and ion implantation (HLPIII) nitriding at different parameters. Wear test was carried out on reciprocating wear test machine in 25% of fetal calf serum solution to study the effect of modified CoCrMo alloy surface roughness on the friction and wear properties of Ultra-high molecular weight polyethylene (UHMWPE). The results revealed that the main wear mechanism of UHMWPE was adhesive wear for lower modified CoCrMo alloy surface roughness(Ra=0.0176μm). And abrasive wear was dominated for higher modified CoCrMo alloy surface roughness (Ra=0.1529μm). In both cases, UHMWPE wear rates were relatively high. However, when modified CoCrMo alloy Ra was 0.1145μm, UHMWPE wear debris may be transferred to the friction surface, and this effectively weaken the role of rough cutting peaks. And it has the lowest wear rate of UHMWPE for modified CoCrMo alloy with 0.1145μm surface roughness.
  • . 2010, 41(08): 48-0.
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    Abstract: CNT-Ni wires were fabricated by the direct depositon of CVD method, and the field emission properties were tested by the diode-type configuration. Test results show that (1)the surface states of CNT have an obvious impact on the stability of field emission.PWP and GGA were adopted to simulate the band structures and electron density states of CNT before and after the surface adsorption of H2O molecular, the changes of band structure and electron density states show that the adsorption of H2O molecular has an enhancement to the filed emission current.(2) high vacuum is an indispensable condition to the stability of filed emission of CNT.(3)Phosphor also has a certain contribution to the current, but the impact can be ignored under a large field emission current.