24 December 2010, Volume 41 Issue S2
    

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    研究与开发
  • Investigation of the etching process of titanium/aurum electrodes of the organic thin film transistor
    WU Zhiming;;;
    . 2010, 41(S2): 1-0.
    Abstract ( ) Knowledge map Save
    Titanium/aurum thin films which were used as the electrode of the organic thin film transistor (OTFT) were etched respectively by inductively coupled plasma (ICP) dry etching and wet etching. The effect of different etching process on the performance of OTFT was investigated by changing the etching process, and the results were compared and analysed. The results showed that ICP dry etching is not suitable for etching titanium/aurum electrodes, and HF: HNO3: H2O = 1:1:5 and KI: I2: H2O = 4:1:40 were the optimum etching processes for etching titanium and aurum electrode with the critical dimensions of 5 microns and more, respectively.
    • 综述
  • Study on Long-wavelength Infrared Glasses
    wang yanhang
    . 2010, 41(S2): 2-0.
    Abstract ( ) Knowledge map Save
    Long-wavelength infrared glasses are extensively used for windows, lens and fairings in the field of photoelectric technology due to their excellent infrared properties. Long-wavelength infrared glasses consist of chalcogenide glasses, halide glasses and chalcohalide glasses. The basic properties, research progresses and applications of long-wavelength infrared glasses were reviewed. In addition, the prospect of long-wavelength infrared glasses was outlined.
  • Research progress in fluoride modification of cathode materials for lithium-ion batteries
    ;
    . 2010, 41(S2): 3-0.
    Abstract ( ) Knowledge map Save
    The cathode materials for lithium-ion batteries bulk-doped or surface-treated by fluoride was reviewed.The stability ,cyclic performance ,working voltage or charge-discharge capacity of some cathode materials was improved after modified by fluoride,and the reason for improvement was analyzed briefly. Future research trends on fluoride modification of cathode materials for lithium-ion batteries was proposed.
    • 研究与开发
  • Influence of Anti-ferromagnetic Exchange Interaction on the Curie Temperature of P, n-type doped GaAs
    ;;
    . 2010, 41(S2): 4-0.
    Abstract ( ) Knowledge map Save
    GaAs Curie temperature depends on carrier concentration and anti-ferromagnetic exchange interaction, This paper quantitatively analyzes the Influence of anti-ferromagnetic exchange interaction on the Curie temperature of p, n-type doped GaAs. Calculations prove that influence of anti-ferromagnetic exchange interaction on the Curie temperature of p, n-type doped GaAs is essentially different: p-type semiconductor materials, the Curie temperature is only with the anti-ferromagnetic exchange interaction, but with doping concentration has nothing to do; n-type semiconductor, the Curie temperature depends on the anti-ferromagnetic exchange interaction and doping concentration, and the high doping concentration the Curie temperature than low doping concentration is low.
  • Preparation of Polybutylcyanoacrylate Encapsulated Rose Fragrance Nanocapsule
    Jing Hu;Zuo Bing Xiao
    . 2010, 41(S2): 5-0.
    Abstract ( ) Knowledge map Save
    Polybutylcyanoacrylate (PBCA) encapsulated rose fragrance nanocapsule was prepared via anionic polymerization under the emulsion system successfully in this paper. The structure of polybutylcyanoacrylate encapsulated rose fragrance nanocapsule was determined by Fourier Transform Infrared Spectrometry(FT-IR), Scanning Electron Microscope(SEM), Dynamic Light Scattering(DLS), Thermogravimetry Analysis(TGA) and Electronic nose. FT-IR displayed that PBCA interacted with rose flavor via the hydrogen bonds. DLS and SEM showed that the diameter of the spheric polybutylcyanoacrylate encapsulated rose fragrance nanocapsule kept 50～60nm and dispersed even. In comparison of PBCA, the average size of PBCA encapsulated rose fragrance nanocapsule was increased, but it dispersed more even. TGA indicated that both of PBCA and PBCA encapsulated rose fragrance nanocapsule had two thermal decomposition periods. The weight loss of nanocapsule during the first decomposition increased 17.45% compared to PBCA. Electronic nose confirmed that the heat operation can’t influence the aroma strength of PBCA encapsulated rose fragrance nanocapsule. Besides, the aroma strength of nanocapsule was higher than that of the rose fragrance without encapsulation after thermal operation.
  • Study on the Temperature-magnetic Stability of AlNiCo8 Used in Aero-field
    ;sun jian chun
    . 2010, 41(S2): 6-0.
    Abstract ( ) Knowledge map Save
    The magnetic performance of AlNiCo8 hard magnet used in aero field was enhanced by -70～300℃ high-low temperature heat treatment. And the performance of AlNiCo8 between 20～180℃ was measured by high temperature magnetic testing system AMT-4. Results show that high-low temperature heat treatment can make the magnetic performance of AlNiCo8 hard magnet more stable. And with the increase of temperature rang of high-low temperature heat treatment can obtain better performance. Between 20～180℃, with the increase of temperature, the Br and Hc and (BH)m of AlNiCo8 decreased.
  • The synthesis and characterization of poly(St-DVB-MAA) coated iron oxide microspheres with large diameter and narrow distribution
    ; ;
    . 2010, 41(S2): 7-0.
    Abstract ( ) Knowledge map Save
    The monodisperse magnetic Fe3O4/poly(styrene-divinylbenzene-methacrylic acid) [Fe3O4/poly(St-DVB-MAA)] particles with diameter of 300-500μm were prepared by dispersion polymerization in the presence of a ferrofluid coated with polyethylene glycol(PEG) and sodium dodecyl sulfate(SDS). The structure of the obtained magnetic particles was characterized by by Bio-microscope, Fourizer transform infrared spectroscopy(FT-IR), vibrating-sample magnetometer(VSM), thermogravimetric analysis(TG) and X-ray diffraction(XRD). A series of characterizations show that the prepared magnetic polystyrene microspheres have narrower size distribution with smooth surface, fine morphology and structure and -COOH. The as-repared microspheres are pretty superparamagnetic, the specific saturation magnetization of these microspheres reaches to 3.63emu/g at room temperature. TG provided the weight percent of iron oxide, and the maximum value observed was 17.07%. An increase in magnetic content of the [Fe3O4/poly(St-DVB-MAA)] particles was observed when the amount of ferrofluid increased by TG
  • Coloring Ti Film on 6063 Aluminum Alloy by Ni2+ and Its Properties
    . 2010, 41(S2): 8-0.
    Abstract ( ) Knowledge map Save
    With Ti compounds as main starting material, Ni as coloring agents, chromium-free conversion and treatment for 6063 aluminium at room temperature has been developed. The performance of its treatment fluid can be of steady function without adding oxidants additionally, fast filming in 3min. Through adding potassium makes the conversion coating from colorless into iridescence, which solves the coloring of titanium conversion coating. Through chromate corrosion solution test, the corrosion time of titanium coating is more than 120s; Through observation, titanium is uniformly distributed on the surface of aluminum and the thickness between the 1 ~ 3μm, there are mainly aluminum, titanium, nickel elements in film layer. Through electrochemical detection, titanium passivation film and Ni2 + colored titanium film corrosion currents(Icorr) were 2.120μA, 3.658μA. The aluminum alloy corrosion current is 14.9196μA; Shown by AC impedance spectroscopy, the aluminum alloy specimen has been effectively passivated in the solution, Ni colored Ti film was C1/R1 / (L2 + R2) structure.
  • COMPOSITION AND PROPERTIES OF SOFC SEALING GLASS
    Teng ZHANG
    . 2010, 41(S2): 9-0.
    Abstract ( ) Knowledge map Save
    Sealing glasses for solid oxide fuel celss must initially flow sufficiently to produce an adequate seal, then maintain enough rigidity for mechanical integrity. The thermal expansion characterization of the glass should be compatible with other SOFC components, and the glass should be chemical stable. Over 80 compositions based on modified alkaline earth silicates have been prepared and evaluated, and some general composition-property trends have been identified. The addition of B2O3 decreases the softening temperature as well as the glass transition temperature. The presence of ZnO improves the sealing condition by broadening the temperature window between glass transition and crystallization up to 230°C with high Zn content (Zn/Si molar ratio = 0.7). The coefficient of thermal expansion for these ‘invert glasses’ depends on the average field strength of RO. The addition of BaO increases the CTE of glasses due to the low field strength of BaO. The addition of ZnO decreases the CTE of glasses due to the increase of average field strength.
  • The study of vertical compressing mechanical properties of thin-walled square tubes filled with aluminum foam
    . 2010, 41(S2): 10-0.
    Abstract ( ) Knowledge map Save
    Thin-walled structures with metallic foam filler have been applied more and more widely. Vertical compressing mechanical properties of thin-walled square tubes filled with aluminum foam under quasi-static loading conditions were studied in this paper. The thin-walled square tubes filled with aluminum foam was fabricated by aluminum tube as its shell and Al-Mg closed-cell aluminum foam as its core. The results indicated that the vertical deforming mode of thin-walled square tubes filled with aluminum foam was the same symmetry folding mode as the deforming mode of empty tube, and the number of folds of thin-walled square tubes filled with aluminum foam was more than that of empty tube. And fully foam-filled tubes can endure more stress than the empty tubes. In this paper, finite element models of empty tubes was established and the compressing behavior of this structures is simulated with the use of ABAQUS software, and the mechanical behavior of thin-walled square aluminum alloy tube is studied by simulating compression’s experiments numerically and compare with the results of experiments’. Finally the numerical results are in good agreement with this obtained experimentally.
  • Electrical transport properties in (Sr2-3xLa2xCax)FeMoO6 double-perovskites
    . 2010, 41(S2): 11-0.
    Abstract ( ) Knowledge map Save
    (Sr2-3xLa2xCax)FeMoO6 granules with double perovskite structure have been fabricated by solid sintering technology and sol-gel processes respectively, and were characterized by X-ray diffraction (XRD) and four-probe meter. XRD spectrums showed the samples preferable phase, with the doping content x increase the space group changed from I4/m to Fm3m at x=0.2. The electrical resistivity display different transport behaviors. Optimizing antisite defect and the grain size can effectively change the electrical transport properties in double perovskites structure composites.
  • Influence of micro-composition on the performance of Cu-Zr-Al bulk amorphous alloy
    yue li jie
    . 2010, 41(S2): 12-0.
    Abstract ( ) Knowledge map Save
    The influence of adding Ag and Y to Cu50Zr43Al7 amorphous alloy on glass formation ability (GFA) and thermal stability was studied by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show that Ag and Y appropriate micro-addition can enhance the GFA and thermal stability of the Cu-Zr-Al amorphous alloy. The effect of Ag is better than that of Y. The electrochemical corrosion behaviors of Cu50Zr43Al7, (Cu50Zr43Al7)100-xYx(x=2,5) and (Cu50Zr43Al7)100-xAgx(x=6,7) amorphous alloys in 3.5% NaCl solution were investigated by potentiodynamic polarization method. It is found that corrosion resistance of all amorphous alloys is better than that of the corresponding crystalline alloys. Ag and Y micro-addition can improve corrosion resistance of Cu50Zr43Al7 amorphous alloy. The corrosion current density of Cu43Zr43Al7Ag7 amorphous alloy decreases 1~2 orders of magnitude comparing with that of Cu50Zr43Al7.
  • Thermal Conductivity and Thermal Diffusivity Measurements of Thermal Barrier Coatings
    Lin QIU
    . 2010, 41(S2): 13-0.
    Abstract ( ) Knowledge map Save
    We measured the thermal conductivity and thermal diffusivity of plasma-spray thermal barrier coatings, Y2SiO5 and La2Zr2O7, using a 3ω method similar to a four-probe resistance measurement. The results agree well with those showed in literatures. Three Y2SiO5 samples with different porosities as well as two La2Zr2O7 samples with different porosities are determined near room temperature. The results show that porosity plays an important role in the performance of thermal transport. Furthermore, porosity has a two-way relationship with the thermal diffusivity; the thermal diffusivity of a specific thermal barrier coating is largest at certain porosity.
  • Catalytic Degradation of 4-nitrophenol by Activated Carbon Fiber Supported Iron Tetrasulfophthalocyanine
    ; ; ;
    . 2010, 41(S2): 14-0.
    Abstract ( ) Knowledge map Save
    A novel activated carbon fiber catalyst (ACF-FePcS) was prepared by immobilizing highly active iron tetrasulfophthalocyanine (FePcS) onto the ethylenediamine-modified ACF via acylation reaction. This catalyst was characterized by UV reflectance spectroscopy and XPS. And the catalytic performance of ACF-FePcS was examined by the degradation of 4- nitrophenol (4-NP) in the presence of H2O2. The experimental results showed that the removal efficiency of 4-NP reached more than 90% in 4 h at 25°C, and it still had a good catalytic behavior over a wide range of pH and temperature. Consequently, ACF-FePcS exhibits the process of “enrichment and in-situ catalytic degradation”. Thus the ACF-FePcS/ H2O2 system presents promising prospect in the field of organic wastewater treatment.
  • Corrosion Resistance Properties Of Zinc/Aluminum Based Coating Prepared By Automatic High Velocity Arc Spray
    ;
    . 2010, 41(S2): 15-0.
    Abstract ( ) Knowledge map Save
    In this paper, Zn-Al and Zn-Al-Mg-RE coating were prepared by automatic high velocity arc spray. Corrosion resistance property was studied by immersion experiment in 3.5%NaCl aqueous solution. The microstructure and phase compositions of these coatings were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results revealed that automatic high velocity arc spray coatings were homogeneous and well connection with the substrate. Red rust was not seen on the surface of the two coatings in immersion experiment; which provide sufficient protection to steel structure against corrosion.
  • Effects of Pretreatments on the structure and properties of rice straw
    Xiaolang Chen
    . 2010, 41(S2): 16-0.
    Abstract ( ) Knowledge map Save
    Cellulose fibers were extracted from the rice straw by a chemi-mechanical technique to examine their potential for use as reinforcement fibers in biocomposite applications. The structure and thermal properties of the cellulose fibers was investigated by fourier transform infrared (FTIR) spectroscopy, wide-angle X-ray diffraction (WAXD), and thermogravimetric analysis (TGA). The FTIR results showed that cellulose fibers of rice straw demonstrated that this chemical treatment also led to partial removal of hemicelluloses and lignin from the structure of the fibers. XRD results revealed that this resulted in improved crystallinity of the fibers. The thermal properties of the straw fibers were found to increase dramatically. The degradation temperature of treated fiber reached beyond 300 oC. This value is reasonably promising for the use of straw fibers in reinforced-polymer manufacturing.
  • Research on the nucleus of KDP by a method named “nucleation from droplet by evaporation ”
    ; ;;
    . 2010, 41(S2): 17-0.
    Abstract ( ) Knowledge map Save
    A new method which can be used to investigate the critical nucleus or the near-critical nucleus was proposed in present paper. The size and shape of the nucleus of potassium dihydrogen phosphate (KDP) were investigated by atomic force microscopy (AFM). The experimental results show that nuclei with nm dimension can be obtained by this new method named “nucleation from droplet by evaporation”. The average diameter of the nuclei increases from 25.8nm to 59.1nm with the increase of solution concentration. The size of the minimum nucleus gets close to the value of critical nucleus presumed by classical nucleation theory under the condition of low solution concentration. Generally speaking, the nucleus shows itself as a segment, which is in accordance with the classical nucleation theory. But when the temperature of evaporation is low, the nucleus exhibits a rectangle (pillar), which is similar to the shape of macroscopical crystal. When the speed of evaporation is fast, nucleuses could not form. There only leaves accumulation of solute.
  • Evaluation of the Corrosion Risk in the Mortar by Monitoring Macro-cell Current
    ;
    . 2010, 41(S2): 18-0.
    Abstract ( ) Knowledge map Save
    An integrated macro-cell sensor for monitoring the service condition such as the open circuit potential, mortar resistance and the macro-cell current between the anodes and cathode of the sensor was developed. Through the analysis of the sensor output and the background theory of the macro-cell current, macro-cell current values were confirmed to be sensitive to the mortar resistance, cathode and anode state. Then a quantitive relationship among macro-cell current, cover-zone mortar resistance, open-circuit potential and the corrosion current density was established. For the passive state, macro-cell current was found to be ignorable and totally depended on the lower voltage, higher cover mortar resistance and higher polarization resistance in the sensor electrodes. But for the active state, the regular is completely contradicted. Then the values of Ra+Rc and ln Ia?Ic in different mortar could be obtained according to established relationship. Further, such values could be used as indicative parameters to evaluate the service condition of the cover mortar and corrosion state of the anodes. Re-sults also indicate that macro-cell current sensor could be served as an effective technology for moni-toring the corrosion risk in concrete structures.
  • Preparation and properties of erythromycin-molecularly imprinted membrane
    GUAN Ping
    . 2010, 41(S2): 19-0.
    Abstract ( ) Knowledge map Save
    Erythromycin molecularly imprinted membranes (EM-MIMs) were prepared by MAA as functional monomer, EDMA as crosslinker in the presence of erythromycin as template. The influences of the proportion of EM and MAA, cross-linking use level, different initiators and use level as well as extraction time on the imprinted sites and specific separation of EM-MIM for EM were investigated. The results show that EM-MIM would obtain more imprinted sites and more excellent separation properties for EM when adding MAA 0.0461mol, EM 0.724mmol, AIBN and (NH4)2S2O8 each 0.12g as initiators, and the mole ratio of EDMA to MAA at 5:1. Erythromycin molecules as templates were extracted by ultrasonic oscillating for 40min, using absolute ethyl alcohol as eluant.
  • Research on the WB Absorbing Materials with Porous Lamination
    . 2010, 41(S2): 20-0.
    Abstract ( ) Knowledge map Save
    Accoding to the theory of transmission line of electromagnetic wave, made the traditional absorbing materials with laminated structure to gradient gradual porous lamination absorbing structure, increased the transmission distance and loss of radar in the coating. Use the light superhigh conductive carbon and carbon fibre compound absorbent technology, extending the single effect of absorbent of eletromagnetic loss to absorbing integration with structure or functuional pigment. The absorbing materials with different thickness can realize that the radar reflectivity at (2~8)GHz is less than -15dB, while the radar reflectivity at (26~100)GHz is less than -20dB, which can improve the WB absorbing performance of materials.
  • Hydrothermal synthesis of Blue Luminescent nano- Powders GdVO4:Tm
    He Jing
    . 2010, 41(S2): 21-0.
    Abstract ( ) Knowledge map Save
    Abstract: GdVO4:Tm blue luminescent nano-powders were prepared via sodium dodecyl benzene sulfonate-assisted hydrothermal technique. The structure and luminescence intensity of the samples at different reaction time，concentration of reacting solution and doped amount of Tm3+ were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy (PL). The experimental results showed that GdVO4:Tm was tetragonal.The production was pure powders with a average diameter from 20 to 50 nm.The reaction time ， the concentration of reacting solution and doped amount of Tm3+were important to the luminescence intensity of the productions. GdVO4:Tm can be excited by 200~320 nm ultraviolet radiation．It emits bright blue fluorescence when excited by 278nm ultraviolet radiation. The luminescence intensity of the productions was strongest separately when the concentration of reacting solution was 0.205mol/L ，the reaction time was 3d and doped amount of Tm3+ was 2%。
  • Preparation and properties of PVA-AA-KOH-H2O alkaline polymer electrolytes
    . 2010, 41(S2): 22-0.
    Abstract ( ) Knowledge map Save
    Poly(vinyl alcohol)-acrylic acid-KOH-H2O alkaline polymer electrolyte membranes were prepared by solution-casting method. In order to optimize properties of membrane, the effect of ingredient on characteristics of it is investigated. The phase constituent in membrane is checked by XRD method and the thermal property by DSC technology. In addition, the ionic conductivity and electrochemical stability are investigated with electrochemical measurement technology. The water retention capacity and mechanical property of PVA based alkaline polymer electrolyte membranes can be improved obviously by blending with AA. Addition of KOH and AA can reduce the crystallinity and melting point of the polymer, which makes for the higher conductivity. The polymer electrolyte membranes in this experiment exhibited a high conductivity, all reached 10-2Scm-1, and increased with the increase of KOH content, AA content and H2O content. The maximum conductivity is 0.18Scm-1. The temperature dependence of conductivity conforms to Arrhenius equation in the temperature range of 25～80℃. The polymer electrolyte showed good electrochemical stability with an electrochemical stability window of about 3.6V. So these alkaline polymer electrolytes can meet the most equipments’ demands for their electrolytes.
  • Study on Optical Switching and Color Changing Properties of the W-doped VO2 Films on Muscovite Substrate
    ;Wan-xia Huang ;;
    . 2010, 41(S2): 23-0.
    Abstract ( ) Knowledge map Save
    Abstract：W-doped vanadium dioxide films were fabricated on muscovite using inorganic sol-gel method. XRD, SEM , FTIR and color difference (ΔE* ) were used to analyze the microstructure, morphology, optical switching and color changing properties of the W-doped vanadium dioxide films. The results suggested that the phase transition temperature was decresed to room temperature and the films showed excellent optical switching property with the temperature as well.The color of films was changed, the maximum of color difference was 5.9 during the film metal-insulator transition.
  • Preparation of nano-crystalline CdS thin films and properties of photoelectric response
    MENG XU
    . 2010, 41(S2): 24-0.
    Abstract ( ) Knowledge map Save
    Nano-crystalline CdS thin films were prepared by chemical bath deposition method with N(CH2CH2OH)3 as complexing agent and Cd(CH3COO)2?2H2O and (NH2)2CS as precursors.The influence of the deposition condition,such as the concentrations of precursors,complexing agent,pH value and deposition temperature,on the characteristics of the CdS thin films,were examined by means of FESEM,XRD.The results indicate that the compact nano-crystalline CdS thin films with uniform CdS nanoparticles can be obtained under the optimal depositing condition.UV-vis spectrum shows that CdS thin films with strong absorption in the short wavelength regions,which meet the requirements of solar cells window material and transition layer.The photoelectric spectrum of CdS thin films show a strong photoelectric response and hold the typical features of n-type semiconductor.
  • Surface and Interface Analysis of Rubrene∕TPD Using AFM and XPS
    ;;
    . 2010, 41(S2): 25-0.
    Abstract ( ) Knowledge map Save
    Abstract: The Rubrene/TPD sample is prepared by using multiple source evaporation on the ITO coated glass. The surface topography obtained by using AFM indicates that the Rubrene film has excellent evenly distribution. The electronic states of the surface and interface of Rubrene/TPD are investigated by using XPS. From the surface analysis, it is obtained that there are three peaks in the fine spectra of C1s. The main peak is formed not by C-C bond but by the oxidation of C. With the increasing of sputtering time，the peak corresponding to the aromatic C becomes stronger and stronger but the other two peaks disappear swiftly. The O1s peaks are weakened because of the removal of the oxygen contamination. The N-C bond strengthens slowly in the N1s spectrum. The N1s peak’s intensity becomes stable when it comes to the interface. The peak corresponding to the aromatic C has a chemical shift of 0.25eV and a chemical shift of 0.2eV is found at the peak corresponding to the N-C bond. The peak formed by O contamination has the biggest shift.
  • The study of the relationship between the slenderness ratio of fillers and the percolation threshold
    . 2010, 41(S2): 26-0.
    Abstract ( ) Knowledge map Save
    Nanostructured silver with different slenderness ratio was prepared by a microwave (MW) assisted method. The nano-silver were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). Thermal conductive adhesive (TCA) were prepared by using the different slenderness ratio nano-silver as the thermal conductive filler. The thermal conductivity of the adhesive was measured. The result indicated that the slenderness ratio of the nano-silver had important influence on it’s percolation threshold. Three kinds of percolation threshold theory were used to simulate the experiment results. The simulation results obtained by using modified Nielsen-lewis model were good agree with the experimental results.
  • Erbium(Ⅲ)-ion imprinted silica gel material : Synthesis and selective solid-phase extraction
    . 2010, 41(S2): 27-0.
    Abstract ( ) Knowledge map Save
    The present paper aims at the difficulty in separation and pre-concentration of rare-earth elements.Erbium(Ⅲ)-ion imprinted silica gel(Er-IISG) sorbent was synthesized by surface imprinting technique and was employed as a selective solid-phase extraction material for determination of Er(Ⅲ) from other lanthanide ions. The higher selectivity coefficient of Er-IISG for Er(Ⅲ) in the presence of competitive ions such as Tb(Ⅲ), Dy(Ⅲ) and Tm(Ⅲ) was above 390,which was 42 times over non-ion imprinted silica gel(NISG). The static adsorption capacity was 58.01mg g-1. The Er-IISG offered a fast kinetics for the adsorption and desorption of Er(Ⅲ). The developed method was rapid, selective, sensitive and applicable to the determination of trace Er(Ⅲ) in environmental samples with complicated matrix.
  • Application of the Ag/AgCl Chloride Sensor in Concrete
    ZHAO Wei-xuan
    . 2010, 41(S2): 28-0.
    Abstract ( ) Knowledge map Save
    Try to use the Ag/AgCl chloride ion sensor in concrete to test the feasibility of the sensor using in concrete. The long stability of the sensors in mortar specimens and concrete specimens were examined, the line response equation of the sensors in concrete was established and was checked through accelerated chloride ion penetration. The results showed that the sensor can work effectively in mortar and concrete specimens, the potential drift of the sensor was less than 20mV in mortar specimens within 300d and less than 25mV in concrete specimens within 85d, the repeatability of the sensor was good; the calculation results by the equation were agree to the testing results, the equation was suitable to concrete structure and was accurate. By the equation the Ag/AgCl chloride ion sensor can meet the request of monitoring and detecting the chloride concentration in concrete and realize the aim of warming before the rebar attend to corrosion.
  • Electromagnetic Properties of Micro-coiled Carbon Nanofiber grown on electroplating Ni film
    Yuliang An
    . 2010, 41(S2): 29-0.
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    The electroplating technology was adopted to prepare Ni film for catalytic growing micro-coiled carbon nanofibers by chemical vapor deposition. The morphology and structure of microcoiled carbon nanofibers were characterized by SEM, XRD and polarizing optical microscope in detail. The effect of electroplating process parameters such as the electroplating time and the electroplating current on growth of micro-coiled carbon nanofibers were carried out through experiments. Ferthermore, the electromagnetic performance of the microcoiled carbon nanofibers was measured to demonstrate their wave absorbing ability by wave-guide method in the frequency range of 12.4-18GHz.
  • Research on phase interface heat transfer coefficient in porous metal foam
    Zhang Dan
    . 2010, 41(S2): 30-0.
    Abstract ( ) Knowledge map Save
    The expression of phase interface heat transfer coefficient between porous metal foam and fluid for laminar forced convection in the channel filled with porous metal foam was obtained based on simple cubic model in conjunction with fin theory. The influence of fluid velocity and pore structure to the phase interface heat transfer coefficient was discussed under different conditions. It is shown that the phase interface heat transfer coefficient increases with fluid velocity, increases with pore density but first increases and then decreases with porosity of porous metal foam.
  • The band gap of one-dimensional phononic crystals consisted of functionally graded materials
    . 2010, 41(S2): 31-0.
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    The propagation of elastic waves in one-dimensional phononic crystals (PCs) consisted of functionally graded materials (FGM) has been studied by using the plane wave expansion method. The influences of the initial material constants, exponential factor and filling fraction on the first normalize gap location and width are discussed, respectively. The numerical results indicate that PCs consisted of FGM will occur more band gaps than that composed of isotropic materials in the same region. These results provide the theoretical basis and guidance for PCs consisted of FGM widely using in engineering practice.
  • Study on the Microstructure and Temperature-magnetic Characteristics SmCo5 Hard Magnet
    sun jian chun
    . 2010, 41(S2): 32-0.
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    The microstructure and magnetic performance of SmCo5 hard magnet was characterized by microscopy, X-ray diffraction and AMT-4 hard magnetic testing system. And the magnetic performance of SmCo5 between 20℃ to 100℃ was tested by AMT-4 high temperature testing system. Results show that the microstructure of SmCo5 prepared by metal powder technology contains two main phases with a mean grain size of 20μm. And the surplus Sm and its oxides gather on the grain boundaries. The magnetic performance of SmCo5 decreased with the increase of temperature. The temperature coefficient of the main magnetic parameters of SmCo5 are all negative while the (BH)m of SmCo5 between 20℃ to 100℃ gets a max value.
  • Carbon Nanotube and Potassium Sodium Niobate Composites
    . 2010, 41(S2): 33-0.
    Abstract ( ) Knowledge map Save
    Abstract： We prepared CNT-KNN (carbon nanotube and potassium sodium niobate) composite and studied its structure and properties. The result shows: (1) phase structure and microstructure of the CNT-KNN composites don’t change while the content of CNT varies; (2) 0.02wt‰ CNT addition can improve the d33, but addition>0.02wt‰ deteriorates d33; (3) dielectric constant and capacitance decrease in all composites and strongly depend on density of composite samples.
  • Study on radar-wave absorbing properties of T-ZnO/Fe composite absorbent
    . 2010, 41(S2): 34-0.
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    Abstract:Tetrapod-shaped zinc oxide whisker(T-ZnOw) has been discovered as the whisker that has the unique three-dimensional and tetrapod-shaped structure. It has the characteristics such as material strengthen, anti-static, antibiosis, sound and micro-wave absorption，and it is a multi-purpose materials with great potential development. In this paper, taken advantage of the electric loss characteristic which T-ZnOw has, mixed with the carbonyl iron powder to obtain the composite absorbent. The radar-wave absorbing coating were prepared with T-ZnOw and epoxy, when coat's thickness is 3.0mm, and the mass ratio between the absorbent and the resin 2:1, the most reflection attenuation amout of -24dB, corresponding frequency at 8.5GHz, and the band width that less than -10dB approximately 5.0GHz.
  • Preparation of AZO thin films with Sol-gel method and Study of Al-doping mechanism
    XU ying ;
    . 2010, 41(S2): 35-0.
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    Al doped ZnO thin films（AZO films） was prepared by sol-gel method. The influence of Al doped doping concentration on the crystallization properties, micro-morphology and optical properties of this kind of films were studied, using by X-ray diffractometer, filed emission stereoscan, spectral photometer, Hall admeasuring apparatus. Doping mechanism of Al was also studied. The results indicated that the crystallization properties, micro-morphology and optical properties of Al doped ZnO films were best on the condition that the sol density was 0.5mol/L, while the luminousness was over 80%; electrical resistivity was 2.1×102Ω?cm; Hall mobility ratio was 0.23cm2/V?s and current density was 7.81×1014cm-3.
  • The Synthesis and characterization of block copolymer PMMA-b-PHEA
    Guo Bin Yi;
    . 2010, 41(S2): 36-0.
    Abstract ( ) Knowledge map Save
    The block copolymer poly(methyl methacrylate)-block-poly (2-hydroxyethyl acrylate) （PMMA-b-PHEA）was synthesized through two steps. Firstly， poly(methyl methacrylate) with single-capped chlorine （PMMA-Cl）was polymerized by reverse atom transfer radical polymerization（RATRP）， using 2，2-azobisisobutyronitrile as an initiator，FeCl3 as the catalyst and PPh3 as the ligand. Then PMMA-Cl was used as a macroinitiator to initiate polymerization of 2-hydroxyethyl acrylate using FeCl2/PPh3 as the catalyst by atom transfer radical polymerization(ATRP) and well controlled PMMA-b-PHEA with narrow polydispersity of 1.32 was obtained. The block copolymer was characterized by GPC，FTIR, 1H-NMR, DSC and TGA.
  • Studies on preparation and properties of ulstra-fined cenospheres modified with CaCO3
    JIAN CUI;
    . 2010, 41(S2): 37-0.
    Abstract ( ) Knowledge map Save
    Ultra-fine cenospheres modified with CaCO3 were synthesized by surface liquid deposition method. Both the original and modified cenospheres were characterized by SEM, EDX, XRD, and colorimetric tube techniques. The results show the modified cenospheres’ color is changed from gray black to light gray, and the mean size of modified cenospheres is 1.94μm which is grown by 7.8% than original cenosphere. The modified ecosphere’s area is 2.4m2/g, which is larger about 26.3% than that of original cenosphere. The density of modified cenosphere is in-creased and according to the formula, it could be calculated that the thickness of cenosphere is grown by 30%. The original and modified cenosphere is dispersed by dispersant, and testing indicates that the dispersion stability properties of modified cenosphere are far more improved.
  • Effect of Aluminium Doping on Microwave Dielectric Properties of SiC Powder
    LI Zhi-min
    . 2010, 41(S2): 38-0.
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    Al-doped SiC powders were synthesized by solid state reaction at high temperatures, using Al powder and SiC powder as the starting materials. The prepared powders were characterized by X-ray diffraction (XRD) and Raman spectra. Results show that there does not exit any aluminium composite in the products at above 1900℃, and that more Al atoms enter SiC lattice to form Al-SiC solid solution at 2000℃. The permittivities of undoped and doped SiC powders were determined by the waveguide technique in the frequency range of 8.2-12.4GHz. Results show that the microwave dielectric properties of SiC powder can be improved greatly by Al-SiC solid solution arising from Al doping.
  • First-principles method for modeling tetrahedral amorphous carbon
    . 2010, 41(S2): 39-0.
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    There are seldom methods to investigate the amorphous materials in atomic-scale, which can be solved through simulation method. A first-principles method to model tetrahedral amorphous carbon was presented. The microstructures of tetrahedral amorphous carbon at densities from 2.6 to 3.2g/cm3 were simulated using molecular dynamics within the framework of density-functional theory. Exchange-correlation functional, fictitious electronic mass, and cooling rate have great influences. More accurate structures can be obtained by adjusting simulation parameters.
  • the influence of activation condition to The sepiolite decoloured
    liu di
    . 2010, 41(S2): 40-0.
    Abstract ( ) Knowledge map Save
    The sepiolite is because of possessing unique structure , and possessing open pass and bigger , it possesses the good physical chemistry capabilitys such as sticking decolouring nature and ion exchange etc than the surface area . The day sepiolite of this text to with the river Northen Dynasties is the raw material , and prepares that active Bai Tu has carried on the research of system with the sour activation of wet law . Having studied the different activation conditions , to active Bai Tu is decoloured the influence of capability to ( sour consistency , temperature , time ) The major achievements gained by way of research : The sepiolite when time that the sour consistency of activation is the 0.6mol/L, for 60min,'s temperature is 100 ℃s after the activation decolours , and power is the best . Finally reaching sour consistency of conclusion activation , time , the temperature is to the influence of sepiolite decolouring nature , and the optimum acid consistency of activation is got , time and his temperature .
  • The impact factors and improvement methods of the mechanical properties of the SiO2 aerogels
    ;
    . 2010, 41(S2): 41-0.
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    SiO2 aerogels have well been acknowledged as the attractive candidates in many applications for their unique thermal, acoustic, optical and electrical properties owing to the nano-porous network structures. However, the low strength and fragility of the SiO2 aerogels monoliths limited their development and applications. The characterizations of the mechanical properties of the SiO2 aerogels were summarized. The effects of fabrication conditions (viz., the pH, the material ratio, the reaction temperature and time, the post-treatment techniques and the drying conditions) on the network structure and mechanical properties of the SiO2 aerogels were reviewed. The advance on the improvement of the mechanical properties of the SiO2 aerogels by using composite methods was also introduced.
  • Thermal degradation kinetics of UV- curing poly(methylacyloxylpropyl-POSS)
    Sun Beibei;GAO Jun-Gang;LI Xing
    . 2010, 41(S2): 42-0.
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    Abstract: Degradation kinetics of poly (methylacyloxylpropyl-POSS) which was cured by UV-radiation was investigated by thermogravimetric analysis and thermogravimetric-mass spectra. The thermal degradation kinetics was studied by Ozawa, Kissinger-Akahira-Sunose（KAS）and Friedman methods. The results indicated that the degradation process can be divided into two stages. The carbonyl group and ether bond were decomposed and produced CO or CO2 at 360~677 oC, the CH3+ was produced at 445~655 oC. The thermal decomposing activation energy is between119.88 and133.72 kJ/mol and was found to be increased at first and then decreased. The thermal degradation reaction order is 0.852.
  • Preparation of Hollow Polymer Microspheres and Its Application in Coatings
    . 2010, 41(S2): 43-0.
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    Crosslinked polymethyl methacrylate microspheres having hollow structure were prepared by suspension polymerization with methyl methacrylate, ethylene glycol dimethacrylate resin and mixed solvents as raw materials. The morphology and hollow structure of the microspheres were characterized by SEM. The formation of hollow microspheres and the main factors were analyzed and studied. A building energy saving coatings was made with hollow microspheres as functional additives and with acrylate emulsion as film-formers. The physical properties and thermal insulation properties of the coating were studied. The results showed that crosslinker and the porogen were the most important factors in the synthetic process of hollow polymer microspheres. The adhesion of coating increased, and the brightness and decorative of coating improved, as well as the thermal insulation properties of the coating improved when hollow microspheres which accounted for about 30% were added in coating.
  • Influence of MoO3 Content for change of resistivity in VO2 thin films
    . 2010, 41(S2): 44-0.
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    Author have studied the change of the resistivity of VO2 thin films follow the change of impurity MoO3. Have established mathematics model of quantity level on resistivity sudden change (S) of VO2 thin films, and have carried out theoretical calculation and contrast with the actual measurement. Results shows that: S is reduce follow increase of MoO3 content. When apply this mathematics model can budget the S value very good.
  • Growth and characterization of Polycrystalline CdS thin films prepared by ion beam sputtering deposition
    ;;;;;
    . 2010, 41(S2): 45-0.
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    Polycrystalline CdS thin films were prepared on BK7 glass substrates by ion beam sputtering deposition. The influence of the substrate temperatures(100～400°C) and thicknesses(35～200 nm) on the structural, optical and electrical properties of CdS thin films was investigated. X-ray diffraction (XRD) analysis revealed that CdS thin films present the preferential (002) orientation of hexagonal phase and the characteristic peak intensity of CdS (002) increases which indicates an improvement in the crystallinity of CdS thin films with the increase of substrate temperature. The average film optical transmittance of the films is over 75% in the visible region and the optical band gap increases from 2.32 eV to 2.42 eV when the substrate temperature elevated. The electrical sheet resistance of all the CdS thin films reaches up to 109 Ω. Then, the investigation of CdS thin films with different thicknesses prepared at the substrate temperature of 400 °C shows that the thinner CdS films(50～100 nm) also have a preferable performance, which is good enough for the buffer layer materials of CIS solar cells.
  • Optical and Electrical Properties of ZnO: Al Films prepared by Tilted magnetron sputtering at low temperature
    Lan Feng; ;
    . 2010, 41(S2): 46-0.
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    Aluminum-doped zinc oxide (ZAO) thin films were synthesized via a DC - RF co-sputtering on glass substrates at room temperature. This paper studied the impact of tilt angle of the target on the electrical and optical properties, UV - visible - near infrared area transmittance, X-ray diffraction and surface morphology of the samples. The results show that when the target angle is 23 °, the ZAO films are preferred (002) orientation. The lowest sheet resistance could be obtained, which is 17Ω / □. The resistivity is 2.2 × 10-3Ω ? cm. The average transmittance is more than 85% in visible range, and the highest could be more than 95%. UV cut-off and near-infrared reflection effect is obvious.
  • Field emission properties of carbon nanotubes films in the optimal experimental conditions
    . 2010, 41(S2): 47-0.
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    In this paper, we reported the CNTs films were directly synthesized on stainless steel substrates by MPCVD without pre-coating of catalyst layer, and especially investigated the influence of the reaction temperature, pressure, deposition time, and methane flow rate on field emission from such deposited carbon nanotubes films by orthogonal design method. The results showed that: under different prepared conditions, the field emission properties of carbon nanotubes films are very different, which play a major role is the reaction temperature and pressure. To maintain the flow of hydrogen (100 sccm) constant, temperature of 700 ~ 800 ℃, the reaction chamber pressure of 6.5KPa, the field emission properties of the is best, the turn-on field strength only is 0.8V V/μm, and emission sites are dense and uniform.
  • Electrochemical capacitive behaviors of mesoporous carbons from barium citrate
    ;;;
    . 2010, 41(S2): 48-0.
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    Mesoporous carbon electrode materials were prepared directly from pyrolysis of barium citrate. N2 adsorption shows that the carbons prepared are typical mesoporous materials and that the specific surface area, total pore volume, mesopore volume and average pore size increase with the rise of carbonization temperature. Electrochemical measurements demonstrate that the carbons prepared at 700 and 800℃ have superior capacitive performances than OMC prepared by hard-templated method. BaC-700 and BaC-800 could maintain high energy density at high power output, at which their mesopore surface are utilized efficiently. It is believed that these carbons are very promising for the scenarios where both high energy density and high power output are required.
  • Stimulated emission and waveguide effect in InxGa1-xN espaliers grown on sapphire by metal organic chemical vapor deposition
    . 2010, 41(S2): 49-0.
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    The InGaN espaliers grown on sapphire by metal organic chemical vapor deposition (MOCVD) was investigated, emphasis the PL spectra of the sample. The differences of PL spectra accepted in three places were observed. To validate the relative of excitation intensity and this phenomenon, the PL spectra under different excitation intensity was analyzed, it can be concluded that the stronger excitation intensity will arises excitation-excitation scattering and stimulated emission, the appearing of assist peaks. After analyzing the experiment and the theory data, two effects may be responsible for the experiment results: one is Fabry-Perot like interference of grazing light in substrate also called micro-cavity effect, the other is wavelength selection effect due to the absorption refraction and the transmission in waveguide.
  • The relationship between Toughness with Grain size and Distribution in BaTiO3 Piezoelectric Ceramic
    . 2010, 41(S2): 50-0.
    Abstract ( ) Knowledge map Save
    Based on the piezoeletric ceramic self-thoughening and considered the influence of the micro-cracks and pores ,a model of thoughness with grain size and distribution was built. The relationship among BaTiO3 piezoelectric ceramic toughenese , grain size and distribution were analyzed theoretically; Simultaneously, the effect of piezoelectric ceramic tougheness to coarse particles was analyzed. It’s shown that the simulation results is consistent with that of experiments.
  • Synthesis and Characterization of CdS Semiconductor Nanoparticles
    ;
    . 2010, 41(S2): 51-0.
    Abstract ( ) Knowledge map Save
    CdS nanoparticles were synthesized by using cadmium acetate, sodium sulfide and SBS-OH poyl(styrene-b-butadiene-b-styrene) as raw materials through salt-induced route in tetrahydrofuran-methanol-water. The optical properties and morphologies for the synthesized CdS nanoparticles were determined through UV-Vis and TEM measurements. The results show that stable corona-embedded CdS nanoparticles could be obtained by taking advantage of amphiphilic properties for SBS-HO micelles in tetrahydrofuran-methanol-water. UV-vis absorption and PL spectra show that CdS nanoparticles could give an apparent quantum confinement effects.
  • Peroxide Pre-vulcanized Natural Rubber/Silk Fibroin Antibacterial Composite: Its Preparation and Properties
    ; ;Ying Chen;Li Ding;;;
    . 2010, 41(S2): 52-0.
    Abstract ( ) Knowledge map Save
    A novel composite possessing antibacterial property was prepared by peroxide pre-vulcanized natural rubber (PVNR) and ternary-mixture dissolved silk fibroin (SF) through latex compounding technique. The relative property of the latex and the sheets was performed and analyzed. The results showed that SF maintains the stability of latex, which is important to latex system. After drying and forming sheets, the compatibility between PVNR and SF is very excellent, and SF enhances the tensile strength of the matrix at a certain extent. Moreover the thermal stability and viscoelasticity of PVNR matrix are not greatly affected. In addition, it can be predicted from infrared spectra that the antibacterial property of SF may relate with the amied I structure and further research will continue.
  • ADSORPTION THERMODYNAMICS AND KINETICS OF COBALT IONS ON STARCH MICROSPHERES
    ;
    . 2010, 41(S2): 53-0.
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    The adsorption behavior of Starch Microspheres(CSM) for Co2+ was investigated at different temperatures. The thermodynamics parameters in adsorption process were calculated and the property of adsorption kinetics was studied, the mechanism of adsorption was preliminarily discussed. The results show that the adsorption characteristic of CSM for Co2+ is adapted to Langmuir and Freundlich adsorption isotherm equation, the adsorption thermodynamic of CSM for Co2+ including enthalpy change ΔH, free energy change ΔG and entropy change ΔS, are all negative when temperature were in the range of 308 to 328K, which indicates the adsorption is a spontaneous and exothermic process of decreased entropy, and the decrease of temperature would benefit the adsorption. The CSM absorb Co2+ by means of physical adsorption. the adsorption rate is mainly controlled by the external diffusion and the particle diffusion, and the external diffusion is the main rate-controlling step.
  • Preparation and Characterization of PVA-KOH-H2O Alkaline Gel Polymer Electrolyte
    . 2010, 41(S2): 54-0.
    Abstract ( ) Knowledge map Save
    Polyvinyl alcohol(PVA)-KOH-H2O alkaline gel polymer electrolyte was prepared by solution-casting method. The ionic conductivity of the PVA alkaline gel polymer electrolyte was investigated by the electrochemical impedance spectrum method, the results showed that the ionic conductivity first increased and then decreased with the increase of KOH content. When the mass ratio of PVA:KOH is 3:4.5, it exhibited the highest ionic conductivity of 4.63×10-2S㎝-1 at room temperature. The temperature dependence of conductivity conforms to Arrhenius equation basically. Addition of KOH can convert the crystalline of PVA into an amorphous phase and reduce the crystallinity. The Cyclic Voltammograms and Differential Scanning Calorimetry indicated the gel polymer electrolyte had promising electrochemical and thermal stability. It is suggested that the PVA alkaline gel polymer electrolyte could be applied in alkaline rechargeable batteries.
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