30 November 2012, Volume 43 Issue S2
    

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    研究与开发
  • Study on the structure and optical properties of Ni:MgO nanocomposite films
    . 2012, 43(S2): 1-0.
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    Eptaxial MgO films with embedded metallic Ni nanocrystal (Ni NCs: MgO) multilayer films were successfully fabricated on MgO substrate by pulsed laser deposition (PLD) method. High resolution X-ray diffraction (HRXRD) and UV-Visible absorption spectra were employed to analyze the structure and optical properties of Ni NCs:MgO films respectively. HRXRD results showed that the MgO substrate and Ni metallic particles all were growing along with the (200)direction. The embedding of Ni NCs caused lattice distortion of MgO films. As a result, the lattice of MgO changed and the diffraction peaks of MgO were broadening. The account and the size of Ni particles increased with the increase of the laser pulse numbers of Ni. According to the UV-visible absorption spectra, the Ni NCs surface plasmon resonance absorption peaks were observed in the wavelength range of 190nm-600nm. With the increase of laser pulse numbers of Ni, the intensity of each single absorption peak increased at the same time with red-shifting. When laser pulse numbers of Ni increased from 200 to 250, one absorption peak split.
  • Design of Planar Anisotropy Carbonyl-Iron / Epoxy Resin Composites
    . 2012, 43(S2): 2-0.
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    The planar anisotropy carbonyl-iron has been prepared via ball-milling technique and the complex permeability and permittivity spectra of planar anisotropy carbonyl-iron/epoxy resin composites was measured, which indicates a high complex permeability in higher frequency range. When the volume of planar anisotropy carbonyl-iron increase, both complex permeability and permittivity increase but the part of complex permittivity is faster. According to the complex permeability and permittivity spectra of planar anisotropy carbonyl-iron / resin composite, the monolayer and bilayer absorber wear optimized by the impedance matching design method. A double-layer absorber that the thickness of the first layer is 0.6mm, the thickness of the second layer is 1.7mm has a minimum reflection attenuation -25.4dB and the bandwidth under -10dB reaches to 10GHz.
  • Experimental investigation and solubility numerical simulation of high energy milling Mo-Cu
    HU Bao-Quan
    . 2012, 43(S2): 3-0.
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    Abstract: Mo-3wt%Cu and Mo-10wt%Cu composite powders was processed by using a technology of mechanical alloying for a range of milling times up 50h. An analysis was made on the micrograph and character of Mo –Cu composite powders by SEM and XRD, and solubility of Cu in Mo was studied by thermodynamic method. The results indicate that ultrafine and very homogeneous composite powders can be fabricated by using a technology of mechanical alloying, average crystallite size was about 80nm; From thermodynamic balance, increasing solubility of Cu in Mo through crystal refinement can be expressed by numerical simulation.
  • Fabrication and Properties of Cobalt ferrite/lead lanthanum zirconate titanate 0-3 composites via modifying phase boundary
    ;Dong-Liang SHI;;;;
    . 2012, 43(S2): 4-0.
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    The Cobalt ferrite (CFO) powders were coated with zirconia via sol-gel methods to form core-shell structures. The Li2WO3 was used as sintering additives to decrease the sintering temperature of the lead lanthanum zirconate titanate (PLZT). Two kinds of powder were well mixed and then pressed to form raw disks. After being co-fired at designed temperature, the xCFO/(1-x)PLZT 0-3 multi-ferroic composites (x = 0.1, 0.2, 0.3, 0.4 in weight fraction) were obtained. The effects of the CFO content, phase structure, micro morphology and sintering conditions on the dielectric, piezoelectric and ferroelectric properties were investigated. The X-ray diffraction patterns showed that the composites presented a perovskite structure and a spinel structure of CFO. The SEM micro morphology and Energy Dispersive Spectrometer results showed that the CFO particles were well dispersed in PLZT, the ZrO2 was well coated on the CFO surface and effectively blocked the diffusion of iron and cobalt ions into the PLZT. The magneto-electric coefficient of the CFO/PLZT composite ceramics (x =0.2 ) which were sintered at 1100℃ was found to be 353 mv/Oe?cm at 10kHz.
  • The affect of atomic radius and electronegativity on activity evaluation of the binary alloys
    Yi-Feng GAO
    . 2012, 43(S2): 6-0.
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    The molecular interaction volume model(MIVM) and the regular solution model have been applied to evaluate the activities of components in binary solid alloys, and the results of evaluation have been compared and analysed. It has been known that the evaluation of the two models are acceptable in these systems. According to the theory of the two models, analysis found they are also have a good acceptance in the systems where the atom radius and negativity have little difference, and it is proved in this study.
  • Specific Research on The Radar Absorbing Coating
    . 2012, 43(S2): 7-0.
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    Abstract: Taken the triple-layer Radar absorbing coating as an example, we used error factor to simulate interference and used SNR(signal to noise ratio) as an index to evaluate the quality characteristic of the product.Based on the orthogonal table of L9(34), we arrange the controllable factors and based on the orthogonal table of L36（23*313）, we arrange the error factors.According to taguchi method and cross-products of inner and outer arrays,we made specific research.The research shows that:when the electromagnetic parameters of the bottom layer is e=22.18-j1.82，u=1.09-j1.81，the thickness of the bottom layer is 0.3mm;electromagnetic parameters of the mesosphere is e=6.7-j0.64，u=0.54-j0.31，the thickness of the mesosphere is 0.7mm;electromagnetic parameters of the top layer is e=10.77-j1.15，u=1.67-j1.23,the thickness of the top layer is 0.2mm;the frequency is 10GHz and the thickness of the coating fluctuates 10%, the average reflectivity is less than -10dB.It has a faculty of resisting the fluctuation of thickness and electromagnetic parameters.
  • Studing on The influence of composite rare earth catalyst on diesel exhaust purifying
    ;;;;;;
    . 2012, 43(S2): 8-0.
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    In this paper, the coating of the different components of complex oxides and perovskite type was prepared By deposition, This coating is supported on cordierite honeycomb ceramic carrier and SiC from diesel four-way exhaust purifier, Study of catalytic converter for diesel exhaust purifying effect, At the same time of cationic surfactant, inorganic thixotropic agent and other additive on the properties of the coating were studied, Through the N2 absorption, X ray diffraction (XRD), differential thermal analysis (DTA) method for specific surface area and thermal stability of catalyst coating were tested to evaluate, Simulation in diesel exhaust particles, Using DTA method to test the composite catalyst on the particulate matter of light-off temperature decrease, Diesel engine bench test results show that After the purification exhaust HC, CO, particulate and NOx emissions were 0.03 g/kW.h, 0.17 g/kW.h, 0.007 g/kW.h and 4.78g/kW.h, Composite catalyst soot ignition temperature is decreased to 411 ℃.
  • Researchs on Chemical Synthesis, Representation and Electrochemical Performance of Hydrochloric Acid doped Polyaniline
    ;
    . 2012, 43(S2): 9-0.
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    This article discussed the synthesis conditions of polyaniline (PAn) by oxidatively chemical polymerization, and researched the influence of media types and concentration of the acid, the antioxidant types and the dosage and so on to the Polyaniline production rate and conductive rate. The PAn was characterized by FTIR, SEM,and Element analysis. The electrochemical performance was researched by Circulation current-voltage, AC impedance and battery charging and discharging experiments.
  • Study on properties and process of electromagnetic shielding coating
    . 2012, 43(S2): 10-0.
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    Nickel-Copper multi-layered composite electromagnetic shielding coating was covered on the surface of epoxy resin after electroless plating by brush plating process．The influence of different process parameters on surface morphologies, the deposition rate and the adhesion of the composite coatings were analyzed. The shielding effectiveness of electromagnetic shielding coating plated by different process parameters were tested. The results showed that the optimized voltage for Copper was 5V, and Nickel was 4V, the optimized velocity of brush was 6m/min. By this process, the adhesion of the composite coatings reached 20.44N, the shielding effectiveness of composite electromagnetic shielding coating was above 74dB.
  • Investigation on fabrication of ultrafine-grain tubular part through power spinning
    . 2012, 43(S2): 11-0.
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    Based on theory of severe plastic deformation at room temperature, the power spinning process for fabricating the ultrafine grain (UFG) tubular part was investigated and its influence on mechanical property of 20 steel tubular part was also analysed. Finally, the feasibility of process scheme, multi-pass stagger spinning—static recrystallization —stagger spinning—recrystallization annealing, was verified through experiment. The result reveals that the minimum size of equiaxed crystal with random crystallographic orientations is less than 1 um by this process scheme. Moreover, not only the macro sizes have a good accuracy, but also the comprehensive mechanical properties are improved, which indicates that the fabrication of UFG tubular part by this scheme is feasible.
  • Preparation of Nanocapsules Loading Thyme Essential Oils and Its Antimicrobial Effect against Leather
    Jing HU ;;
    . 2012, 43(S2): 12-0.
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    Nanocapsules loading thyme essential oils with the shell of poly(methyl methylacrylate-butyl acrylate) were prepared via interfacial polymerization. The influence of the experiment conditions such as the use level of emulsifers, thyme essential oil and shell materials on the size of nanocapsules loading thyme essential oils has been investigated in detail. The results showed that the average size of nanocapsule loading thyme essential oils was 152.20nm with 3% T-20, 12% thyme essential oil and 5% shell materials. The thermal weight loss of nanocapsule loading thyme essential oils with 12% was increased 11.57% in compared to that of poly(methyl methylacrylate-butyl acrylate) nanoparticles, which is concluded that thyme essential oil was encapsulated into nanocapsules. The nanocapsules loading thyme essential oils can restrain the Aspergillus albicans, Aspergillus niger and Aflatoxin of leather. The antimicrobial effect against leather fibres with nanocapsules loading 12% thyme essential oils was higher than that of 6% thyme essential oils after displaying 12 days.
  • The improved terahertz TL-RLC Model for circular split-ring resonators
    ;sheng LI
    . 2012, 43(S2): 13-0.
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    Utilizing a series of micro-fabrication processes for terahertz meta materials, we fabricated three geometries of split-ring resonators: a circular geometry and two elliptical geometries. The measured results showed that multiple resonant and the coupling among those resonant had played an important role on the overall response. For better matching TL-RLC model results with measured data, an improved model was introduced. Then the expression of the highest resonant frequencies in the improved model was introduced.
  • Solid-Phase Photocatalytic Degradation of PVC paste film by modified nano-TiO2
    ; ;;;
    . 2012, 43(S2): 14-0.
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    Nano-TiO2/PVC paste composition films, which were prepared by ATBC, PVC paste resin and nano-TiO2, were studied in the irradiation condition of 30W UV light. GPC, SEM , FT-IR and other special analyses were used to characterize the films. The results indicate that the degradation efficiency of nano-TiO2/PVC composition films is increased about 128.43%. After 720h irradiation on the films, the Mn and Mw decrease 24.75% and 17.7% respectively, the surface morphology of nano-TiO2/PVC composition films shows many cracks and some cracking to pieces.
  • Luminescent properties of Eu2+ in Sr2SiO4?SrCl2 phosphor
    . 2012, 43(S2): 15-0.
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    Sr2SiO4?SrCl2:Eu2+ is synthesized by a high temperature solid-state method. SrCO3, SrCl2, SiO2 and Eu2O3 are used for starting materials. The phase present of the samples is characterized by powder x-ray diffraction (XRD) (D/max-rA, Cu K?, 40 kV, 40 mA, λ=0.15406 nm). The luminescent properties of phosphors are measured by a SHIMADZU RF-540 fluorescence spectrophotometer. Sr2SiO4?SrCl2:Eu2+ shows a broad emission band in the region of 350-600 nm. With increasing the Eu2+ doped content (0.5%-2%), the blue emission peak still locates at 403 nm, however, the long wavelength emission peak firstly occurs to red shift, then blue shift. Moreover, the intensity of the two emission peaks gradually decreases. Montoired at the two emission peaks, the excitation spectra both show broad emission band in the region of 250-400 nm, which correspond to that of SrCl2:Eu2+ and Sr2SiO4:Eu2+ phosphors, respectively. In our opinion, the spectral distributing and the emission intensity are influenced by the crystallographic and the energy transfer from one Eu2+ to anohter.
  • The Use of Laminated Steel on Food Packaging
    Junyi Ni
    . 2012, 43(S2): 16-0.
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    A new applied technology of DRD canmaking with printed laminated steel is described. It provides a brief analysis of the defect after the processes of lithography and conventional DRD canmaking, and makes a conclusion that white line caused in drawn operation could be removed by being heated because of the recovery and recrystallization of the PET film. Meanwhile, the new process improves the product performance to maintain adhesion after Pasteurization. The result is that adding the heat treatment before trimming and setting suitable parameters could make sure that product performance is comfortable for food package.
  • Preparation and characterization of Hydroxycamptothecin loated folate-chitosan nanoparticles as a sustained-release drugs carrier
    Zhi-Hua XING;;;
    . 2012, 43(S2): 17-0.
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    Abstract: In order to enhance the tumor-targeting and anticancer activity of hydroxycamptothecin(HCPT), and extend the in vivo effect of time， hydroxycamptothecin-loaded nanoparticles made from folate(FA)-decorated chitosan(CTS) were prepared and their release characteristics in vitro was evaluated．FA-CTS/HCPT nanoparticles were prepared by the ionic crosslinking method through the electrostatic interaction between the protonated amino of chitosan in acidic conditions and the deprotonation of carboxyl of folic acid in alkaline conditions as well as trimeric sodium phosphate (TPP). The morphological characteristics of nanoparticles were examined using a transmitting electron microscope (TEM). The average diameter of nanoparticles and size distribution were determined by dynamic light scattering. The drug encapsulation efficiency (EE) 、loading capacity (LC), and in vitro release characteristics were determined using ultraviolet spectrophotometer.The results indicated that the nanoparticles are uniform spherical and regular, with a size of 150nm、 +50.1mV surface potential and good size stability.Its encapsulation efficiency and loading capacity were up to 89.9% and 19.8 % respectively. The Higuchi equation Q=14.529t1/2+8.3589 (R2=0.9247)can well describe release curve of the FA-CTS/HCPT nanoparticles in vitro(PBS Buffer solution of pH=7.4).
  • Effects of Casting Technique on Microstructure and Mechanical Properties of Manganese Steel Hammer by Casting Process
    Wang Jian Li;WANG Hong feng
    . 2012, 43(S2): 18-0.
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    The combined effect of vibration and rotating of casting machine has gotten by the traditional casting technology improvement. The microstructure and mechanical properties of casting sample by combined effect of vibration and rotating of casting machine have analyzed. Casting machanism of the combined effect of vibration and rotating of casting machine is investigated. The experiment results show that the casting simple has a fine grain size and uniformity, good impact toughness, high hardness, good wear performance, compared with the traditional casting process, the casting part service life can be extended by the new casting technology.
  • The preparation and formation mechanism of micro-nano porous structure surface on pure titanium
    Jing-Mei ZHAOXuejun JIN
    . 2012, 43(S2): 19-0.
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    This manuscript modifies titanium surface through sandblasting & acid etching (SLA), anodic oxidation (AO) and composite process(SLA+AO) for achieving the surface features with micro-nano porous structure, oxygen-rich and anatase structure. Analyze the surface characteristics and formation mechanism of each group samples through surface morphology, surface roughness, surface composition and crystalline structure. The surface morphology of samples with SLA process is formated by 2-3um pits and 100-400nm holes. Besides oxygen-rich and anatase structure, uniform 20-400nm pore structure distributes on the surface of samples with AO process. While samples with composite(SLA+AO) process has micro-nano porous structure like group SLA samples and also oxygen-rich and anatase structure like group AO samples.
  • Leakage current mechanisms of Single-crystalline Tm2O3 high-k gate dielectrics
    ;;;;
    . 2012, 43(S2): 20-0.
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    The current-voltage characteristics of the single-crystalline Tm2O3 high-k gate dielectric thin films, which were epitaxially grown on p-Si (001) substrates by molecular beam epitaxy, have been measured at different temperatures. Temperature-dependent leakage current measurements indicate that Schottky emission is the dominant transport mechanism in the Tm2O3 dielectric films at positive biases, while Frenkel-Poole conduction is the main reason for the leakage currents at negative biases.
  • Preparation and Photocatalytic Properties of TiO2 Microspheres
    . 2012, 43(S2): 21-0.
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    The TiO2 microspheres were prepared by hydrolysis. The influences of the molar ratio of TBT and PEG400 on the particle size and size distribution of TiO2 microsphere were studied. The Particle size and morphology of TiO2 microspheres were characterized by the X-ray diffraction, the scanning electron microscope and the FT-IR. The results showed that TiO2 microspheres distributed in double-size when the additive concentration in the 0.05~0.10 mol/L range. With the increase of additive concentration, the number of small TiO2 microspheres increased. When the additive concentration increased to 0.15~0.20 mol/L, the small TiO2 microspheres preserved and large microspheres disappeared, and the catalytic properties were the best. The highest decolorization rate on the methyl orange solution of 20 mg/L reached to 98.29%, and it had perfect reuse effect.
  • Study the Tunnel Defects of Die Casting AZ91D Magnesium Alloywith FSW Drive Model
    ;Xiang-Jie WANG;
    . 2012, 43(S2): 22-0.
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    Die casting plates of AZ91D magnesium alloy, were welded by friction stir welding,with different welding parameter，then study the microstructure by OM and SEM.The results show that AZ91D plates with thickness of 4 mm, were welded by friction stir welding,when weld speed over 60mm/min,and the joint are easier to generate through type tunnel defects,which is usually locate in the boundary between crown zone and ring zone of advancing side,then spread to the bottom of weld followed by the weld speed increasing.The formation mechanism of the defect as follows: crown area plastic material are drived by shoulder and tool pin,but the ring area plastic material are drived just by tool pin.The different driving mode,which can be caused flow differences between crown zone and ring zone.This phenomenon will be product through type tunnel defects.
  • Preparation and optical hydrogen-sensing properties of WO3:Mo nanocrystals
    . 2012, 43(S2): 23-0.
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    Mo-doped WO3 nanocrystals with various impurity contents were synthesized by hydrothermal method。The influence of Mo doping content on the microstructure and morphology of WO3 nanocrystals were systematically investigated by X-ray diffraction (XRD)，scanning electron microscopy (SEM) and transmission spectra。And their hydrogen gas-sensor characteristics were also analyzed. The results indicated that all the products exhibit hexagonal phase structure，and intensity of（200）crystal face diffraction peak of sample doping for 2at.% is the strongest；With the increased amounts of doping，energy gaps (Eg) of samples decrease gradually；The samples doping for 2at.% performs a quite perfect response to 500ppm H2 at 200 oC 。
  • Research on Biomechanical Performance for CoCr Alloy Coronary Stent in Expansion
    Hai-Quan FENG;
    . 2012, 43(S2): 24-0.
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    Nonlinear finite element method is used to investigate the expansion mechanism and Biomechanical performance for intracoronary stents. Without regard to the interaction with vascular and plaque, the key technologies such as meshing, material constitutive model, boundary conditions, loading definition and contact interaction, are discussed in detail while the stent undergoes the crimp induced contraction, free expansion and unloading. The three different stents Biomechanical performance including the axial contraction ratio, the expansion homogeneity, radical recoil rates, radial force and flexibility are determined according to finite element numerical analysis. Compared with the experimental data, the result of numerical simulation is better agreement with them. The present simulation method can help optimize and assess some Biomechanical performance for intracoronary stents.
  • The influence of corrosion-resistance on biomedical porosity titanium alloys
    ;
    . 2012, 43(S2): 25-0.
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    The porous titanium alloys containing molybdenum elements have prepared by gel-casting methods. The microstructure, the total porosity were investigated by electronic microscopy and X-ray diffraction. The corrosion behavior of the porous titanium alloys of Ti-17.5Mo in the simulated body fluids（SBF） were evaluated by a potentiodynamic polarization test and impedance plots. The results show the corrosion resistance of the titanium alloy increase with the improvement of solid content, the smaller the porosity, the better the thermal stability. The porosity after sintering will reduce with the improvement of solid content， which make the capacitive reactance and impedance of barrier layer increase. It has an important meaning to improving the corrosion resistance. The Solid content of gel-casting of water base can reach 35%，and porosity can reduce to 42% after sintering， the corrosion resistance of the titanium alloy will be the best.
  • The research of electromagnetic characteristics on theFe3O4nanoparticles mixed with SU8 plastic material
    Hong-Qing MAO;
    . 2012, 43(S2): 26-0.
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    Ferromagnetic Fe3O4 nanoparticles have gotten more and more attentions of researchers for its good physical properties, especially it was found in the field of biological geomagnetic navigation. A mixed material which can be used to detect magnetic strength was prepared with Fe3O4 nanoparticles and polymer SU8 plastic materials in this article. We analyzed the magnetic field sensitive principle, how the material sensitive to magnetic strength, in theory, and verified its magnetic field response in experiments. The Permittivity of the mixed material decrease with the increasing of time, and the capacitance characteristics can be used to detect the changes of magnetic field. It can be used as a new type of magnetic sensor materials, and has a broad application space.
  • Performance Evaluation of Strength Additives for Low Weight Tobacco Sheet Made by Papermaking Method
    Xia-Lin LIAO
    . 2012, 43(S2): 27-0.
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    The effects of chitosan, carboxymethyl cellulose, hydroxyethyl cellulose and polyvinyl alcohol as additives on the retention of tobacco furnish and PCC as well as on the physical properties of tobacco base sheet by papermaking method were studied. The experimental results showed that the best retention was displayed by the pulp system added chitosan, at the dosage of 0.5%, the retention rate was increased by 7.3%; while adding carboxymethyl cellulose and polyvinyl alcohol, better bulk and absorption properties of tobacco base sheet were observed respectively; Moreover, the dry and wet strength of tobacco base sheet were improved obviously with adding hydroxyethyl cellulose and chitosan.
  • Study on the thermal expansion coefficient of artificial neural networks used in sealing glass
    FENG Lin Jiang
    . 2012, 43(S2): 28-0.
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    A predicted software of BP artificial neural network model is by created using of hybrid programming based on COM builder. The thermal expansion coefficient of glass samples which belongs to the SiO2-Al2O3-PbO-R2O glass system has been predicted by the predicted software .It is found that the relative error between the experiment value and predicted value is less than 4%. The method have an important effect on formulation design of high-temperature-high-pressure sealing glass.
  • Study on Speed Performance of Bearing Based on Self-Lubricating C(Cr, N) Coatings Steel Ball
    JIA Gui-xi
    . 2012, 43(S2): 29-0.
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    The self-lubricating C(Cr, N) coatings was deposited on bearing steel ball surface by means of an closed-?eld unbalanced magnetron sputtering ion plating technique. An 6204 bearing was used for the bearing experimental work. The microstructure and chemical compositions of the coatings were observed and analysed by the scanning electron microscopy ( SEM) and transmission electron microscopy (TEM). Its adhesion, hardness, toughness and friction behaviors was tested, And the speed performance and self-lubricating properties of coated bearing and uncoated bearing were also tested by an high-performance bearing testing machine, and also been comparatived analysis. The results show that the C(Cr, N) coatings working-layer has better microstructure and comprehensively mechanical properties. And compared to the uncoated bearing, the coatings significantly reduces the value of bearing vibration, the coated bearing greatly improves high speed performance and self-lubricating properties.
  • Preparation and Properities of Lanthanum Doping TiO2/bentonite composite photocatalyst
    . 2012, 43(S2): 30-0.
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    Lanthanum doping TiO2/bentonite composite photocatalyst was prepared by sol-gel method with bentonite，Ti(OC4H9)4 and La(NO3)3 was characterized by XRD and IR，respectively．Under the ultraviolet photocatalytic activity was evaluated by degradation of 2,4,6-trinitrotoluene． The results showed that all the composite photocatalysts contain TiO2 in the anatase phase．The photocatalytic activities of lanthanum doping TiO2/bentonite composite photocatalysts are superior to that of non doped TiO2/bentonite composite photocatalyst．The photocatalystic activity of the La-TiO2/bentonite composite photocatalyst doped with 1at% of lanthanum and calcined under 500℃ was the best．
  • The effect of non-stoichiometry in B″ site on the microwave dielectric properties of BCZN ceramics
    bin tang
    . 2012, 43(S2): 31-0.
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    The influence of B″-site nonstoichiometry on the crystal structures and microwave dielectric properties of Ba(Co0.56Y0.04Zn0.35)1/3Nb2/3+xO3-δ(x=-0.004~0.008) ceramics were investigated by the solid-state reaction. There were Ba(Zn0.33Nb0.67)O3 and Ba3CoNb2O9（BCZN phase） as the main phase, and a little of Ba5Nb4O15 as the second phase was observed in the sample with x=0.008. BCZN ceramics showed good microwave dielectric properties. With x increasing from -0.004 to 0.008, the dielectric constant (εr) decreased , the Q×f value increased from 51631GHz to 76469GHz when -0.004≦x≦0.004, and when x=0.008, the Q×f value went down to 61688GHz. The excellent microwave dielectric properties were obtained with x=0.004: εr =34.84，Q×f=76469GHz，τf≈2.6ppm/oC.
  • Research on the preparation and properties of (0.98-x) BNT-xBKT-0.02BZN lead-free piezoelectric ceramics
    zhang yubi
    . 2012, 43(S2): 33-0.
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    (0.98-x)Bi1/2Na1/2TiO3-xBi1/2K1/2TiO3 -0.02Bi(Zn2/3Nb1/3)O3(abbreviated as (0.98-x)BNT -xBKT-0.02BZN, x=0.1，0.15，0.20，0.25) was prepared by traditional solid sintering methods，we studied the influence of different sintering temperature on its piezoelectric and dielectric properties. These results suggest that piezoelectric constant and electromechanical coupling coefficients increase with the sintering temperature. In this experiment, the optimal sintering temperature is 1140℃ and the optimum properties are as follows: d33=43pC/N, Kp =0.2731, εT33/ε0=1289.8, tgδ=0.038.
  • SYNTHESIS AND CHARACTERIZATION OF ALKENYL SUBSTITUTED 2, 2-BISFERROCENYLPROPANE AND THEIR HOMOPOLYMERS
    ;;
    . 2012, 43(S2): 34-0.
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    6-isopropenyl bisferrocenylpropane, 6-(α-benzenevinyl) bisferrocenylpropane and their corresponding homopolymers were obtained from ferrocene and acetone through a series of reactions. The compounds and homopolymers were characterized by elemental analyses, IR spectra and IHNMR spectra. The thermal stabilities of the homopolymers were studied using DTA-TGA. The results showed that the thermal stabilities of the homopolymers containing ferrocenyl groups were obviously increased, the homopolymers maintained unchanged until approximately 300°C. In addition, the introduction of phenyl group improved the thermal stability of the polymer.
  • Influence of polyester and polyamide6 crystallinity on their interfacial tension of composite system
    Yi-Hua BUYan FENG;Yi-Xia ZHAO
    . 2012, 43(S2): 35-0.
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    The splitting mechanism of PET/PA6 hollow orange-profile spunbonded composite filaments was discussed, and the relation between the crystallinity and the surface tension was also studied. In order to study the influence of PET/PA6 hollow orange-profile filaments crystallinity by cooling drafting process on the surface tension, PET and PA6 films of different molding conditions were made to investigate their surface tension. The deionized water and diiodomethane was used to measure the contact angle with PET and PA6 films of different crystallinity, after calculating their surface tension, we concluded that with the increase of PET/PA6 crystallinity, their surface tension and interfacial tension also increased.
  • Study on Synthesis and Catalysis application of nano-Au/C Catalyst
    Zi-Jing LI
    . 2012, 43(S2): 37-0.
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    The size controlled colloidal gold nanoparticles were prepared by sodium citrate reduction on the base of literature. The size and morphology of the gold nanoparticles were characterized by TEM and UV-Vis spectroscopy. Nano-Au/C catalysts were obtained by loading the gold nanoparticles.The catalysts were used for the catalytic oxidation reaction of glyoxal and glucose in liquid phase. The research results showed that the catalysts had higher catalytic activity, and this preparation method is successful. The catalytic reaction mechanism was discussed.
  • Research of Tin Dioxide Ceramices Doped With Zinc Oxide And Niobium Pentoxide
    . 2012, 43(S2): 38-0.
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    ZnO、Nb2O5 and ZnO-Nb2O5 doped tin dioxide based ceramices prepared by the pressureless sintering have been investigated as funcion of sintering character and electrical property. The microstructure and the phase constitution was measured by scanning electrical microscope and XRD.The results indicate that ZnO can improve the volumn density of the materials,but cannot decrease the electrical resistivity signally，the opitmal content of ZnO is 0.5wt%- 0.75wt%(mass fraction)；Nb2O5 can signally decrease the electrical resistivity,but don't effectively improve the volumn density of the materials. The tin dioxide based ceramice doped with 0.5wt%ZnO- 1.5wt%Nb2O5 and sintered at 1450℃ has high performance;the volumn density is 6.61g/cm3,the electrical resistivity is 867.84Ω·cm.
  • Study on Modification of Waterborne Polyurethane Nano-Dispersions with Hydroxyl Compound
    Yuan-Bo SONG
    . 2012, 43(S2): 39-0.
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    The waterborne polyurethane nano-dispersions modified with glucose (GWPU) were synthesized via pre-polymer dispersion. The effects of the amount of cross-linking agent, glucose, on the synthesis of GWPU were studied. The structure and properties were characterized by FT-IR, DLLS,TEM, TG, XRD, AFM, water contact angle and mechanical properties. Results indicated that the glucose dispersed well as an incorporated state in the polyurethane phase measured by FT-IR. The morphology of the particle is uniform spherical structure and its size increased with the increasing glucose content of GWPU.A distinct improvement in the thermal stability of the resulting polymer with the crosslinking agent was observed compared with the unmodified polyurethane by TG, as a two-step thermal decomposition. AFM indicates that the roughness of solidified WPU films increased when modified by glucose, resulting in water repellence functions.The crystallinity of the resulting polymer, detected in XRD, was low, which indicated that the resulting polymer has superior flexibility.The water swelling decreased with increasing glucose content having optimum glucose content at 4wt% with 5.7%, and it increased slightly with further increase of glucose content. The tensile strength increased, while the elongation at break decreased. The optimum tensile strength and elongation at break were 16.9MPa and 276.5% when the glucose content was 4wt%. And the water contact angle was 97.5°.
  • Property Studies of Polypyrrole/ZnO nanocomposites by Electrochemical Polymerization
    ZHANG Cheng Xiang;Zhiwei ZhaoChen Yong qiang
    . 2012, 43(S2): 40-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Polypyrrole/ZnO (PPy/ZnO) nanocomposites on several different substrates (e.g. nickel sheet, stainless steel mesh, carbon cloth) were prepared using oxalic acid and dodecylebenzensulfonic acid (DBSA) as electrolyte by electrochemical method. For the film of PPy/ZnO nanocomposites grown on nickel sheet, the film surface shows typical cauliflower-like structure representing PPy film, among which white ZnO nanoparticles were randomly distributed.. However, for the nanocomposites grown on stainless steel mesh and carbon cloth, the surface morphorlogy were obviously different from that on nickel substrate, in which uneven sheet structure were clearly observed. The charge storage ability of PPy/ZnO on carbon cloth was relatively stronger, while the capacity of electrochemical exchange reaction and charge storage of PPy/ZnO on nickel sheet and stainless steel mesh were relatively poor.
  • Synthesis of catalyst support in preparation of diphenyl carbonate with oxidative carbonylation and their application
    Xin-Hua LIUQing-Hui WANG
    . 2012, 43(S2): 41-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    It was important to develop catalyst for improving yield of diphenyl carbonate with Oxidative carbonylation.But it was main that catalysts carriers and promoters were developed.（CuO,CoO,MnO) And Fe2O3 nanocomposite gelatum were prepared by using citric acid aqueous solution of Cu,Co, Mn acetates and chloride ferric via sol–gel process and drying under reduced pressure technique. The microstructureand composition of the （CuO,CoO,MnO) And Fe2O3 nanocomposite gelatum were characterized by field emission scanning electron microscopy,transmission electron microscopy, electron dispersive spectroscopy and XRD. Supported catalysts were prepared by using the （CuO,CoO,MnO) And Fe2O3 nanocomposite gelatum as catalyst carriers,and were used in the synthesis of diphenyl carbonate(DPC). The products were analyzed by gas chromatography. The results show that the the （CuO,CoO,MnO) And Fe2O3 nanocomposite gelatum have a clearer acinose structure, ;hypsi-crystallinity and macro- porosity.Thus nanoscale particles can be formed.The main crystal phase in catalyst is CoFe2O4 and CuFeMnO4,and the exist of stable crystal phase CoFe2O4 and CuFeMnO4 may contribute to reduce the leaching of active componentand. The yield of DPC is23.4%.
  • Composition design and analysis
    No
    . 2012, 43(S2): 42-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: Based on the18-8 type metastable austenite stainless steel nickel chromium equivalent control and alloy element analysis, designing chemical composition. Material by EVR smelting, using ICP emission spectrometer, CCS-140infrared carbon and sulfur analyzer on the chemical composition analysis, obtains the best18-8type deformation martensite composition scheme. Keywords:metastable austenite;martensite phase transformation; plasticity;nickel equivalent
    • 综述
  • Research Progress of Military Novel Absording Materials Patent Technology Abroad
    ;;
    . 2012, 43(S2): 43-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The research progress of military novel absorbing materials patent technologies was summarized. Novel absorbing materials included adapative absorbing materials, chiral absorbing materials, electroconductive polymer and foam absorbing materials. The patent numbers，application nation, assignee of novel absorbing materials were listed, and corresponding patent’s features or advantages, preparation method and potential military application were introduced emphatically. Some views on researchment of novel absorbing materials our country were persented.
  • Progress of polymer-based antireflection coatings
    ;
    . 2012, 43(S2): 44-0.
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    This article reviews the research progress in the area of antireflection coatings. The effectiveness in the antireflection of coatings is elaborated qualitatively and quantitatively with respect to various factors, such as the reflective index and thickness of the antireflection coatings as well as multiple layer coatings. The fabrication techniques of polymer-based antireflection coatings are especially addressed, and the perspective in terms of the market and future development in this field is also discussed.
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