15 July 2013, Volume 44 Issue 13
    

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    研究 开发
  • The effect of different orientations on the properties of the BiFeO3 films prepared by PLD method
    HUANG Yan-qin
    . 2013, 44(13): 2-0.
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    A pure phase BiFeO3 target was prepared by Spark plasma sintering (SPS) technique. The preferred orientation and high crystallization BiFeO3 films were prepared by pulsed laser deposition (PLD) method. Above the optimal process, the BiFeO3(100)/LaNiO3(100)/Si(100)、 BiFeO3(111)/LaNiO3(111)/SrTiO3(111)、BiFeO3(110)/Pt/TiO2/SiO2/Si and BiFeO3(110)LaNiO3(110)/Pt/TiO2/SiO2/Si thin films with different epitaxial strain have been prepared. The X-ray diffraction result shows that the structure of thin films of BiFeO3 on the conducting layers epitaxially deposited on the substrate. The ferromagnetic and ferroelectric properties of the BiFeO3 films were estimated form Ferroelectric and Magnetic hysteresis loops and the results show that the epitaxial BiFeO3(111) film has the optimal properties. The rement polarization of ferroelectric of BiFeO3(111) film is 30.3 μC/cm2, the leakage current is 1.0×10-3 A/cm2 and the saturation magnetization is 20.0 emu/cm3.
  • Preparation of MnO2 Nanomaterials and its Catalytic Performance
    Xiao-Ling LEI
    . 2013, 44(13): 3-0.
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    The α-MnO2 nanowires were successfully synthesized by a simple hydrothermal method without using any surfactants．The samples were characterized by XRD and SEM to study their phase，composition and morphology. The influence of reaction temperature were studied. Catalytic properties of the MnO2 nanowires on degradation of Methylene blue were also tested. The results indicate that α-MnO2 Nanoparticles and nanowires and could be synthesized controllably.The size and morphologies of synthesized α-MnO2 nanostructure affect their catalytic degradation properties on Metlylene blue,the nanowires with 20～30 nm diameter synthesized at 150℃ show best catalytic performance by which 91% metlylene could be degraded after 180min.
  • Defect formation energy and Electronic properties of anatase TiO2 doped with C, N, F
    ;
    . 2013, 44(13): 4-0.
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    Recently, non-metallic impurities doped TiO2 semiconductor to improve photocatalytic properties of visible light region is a research focus, but not many related defect formation energy research. In this paper, the defect formation energy and the electronic properties of antase TiO2 was studied by plane wave pseudopotential method based on the density functional theory. After the three elements doped into TiO2, the order of the defect formation energy is C>N>F. The results show that F is most easily doped into the titanium dioxide lattice, but the change of band gap is very small. So F-doped is not as good as N-doped and C-doped in response effect of visible light. In view of the above two reasons, N is the best of the three dopants in improving visible light response.
  • Research on pressure/temperature characteristic of the conductive rubber
    ;
    . 2013, 44(13): 5-0.
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    Abstract: The conductive properties and conductive mechanism are expounded, the piezoresistivity and temperature effect of the conductive rubber are analyzed. The sample of conductive rubber is prepared by experiments, and research on the piezoresistivity and temperature effect of the sample with different conductive particle. The experiments illustrate that the conductive rubber shows different temperature characteristics when different conductive material is added. With temperature rising, conductive rubber alone filled acetylene black, it shows the negative temperature effect between 30 to 70 ℃ and the positive temperature effect between 70-120 ℃; conductive rubber filled acetylene black and N472 show positive temperature effect with temperature rising; conductive rubber filled Nano-Al2O3 show negative temperature effect and the positive temperature. The correlation of resistivity and temperature in change the pressure are discussed, and the main reasons of showing different temperature characteristic are analyzed.
  • Highly Efficient and Chromatic-Stability Yellow Phosphorescent Organic Light Emitting Devices
    . 2013, 44(13): 6-0.
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    Abstract: The yellow Organic light-emitting devices(OLED) were fabricated by evaporation method using R-4Band GIr1(red and green phosphorescent materials). Thedevice structure used here was ITO/MoO3(X)/NPB(40nm)/ TCTA(10n m)/CBP: GIr114%:R-4B2%(30nm)/BCP(10nm)/Alq3(40nm)/LiF(1nm)/Al(100nm),TCTA and BC P were electron and hole block layer separately. We investigated the efficiency and chromatic-stability characteristics of these fabricated devices through the method of optimization of the thickness of the MoO3.The optimum performance of OLED was achieved by the application of 90nm MoO3.The maximum EL efficiency and luminance reached 29.2 cd.A-1 at 7.13mA.cm-2、2081cd.m-2and 24430cd.m-2 at 151.7cd.m2、16.0cd.A-1 respe-ctively.Moreover,Commission International De L’Eclairage(CIE)coordination of（0.5020，0.4812）、（0.4862,0.4962）、（0.4786，0.5027）were obtained at 5、10、15V. The enhanced efficiency and good chromatic stability were attributed to the balanced carrier injection and transport as well as the effective confinement to the light-emitting region with barrier layer.
  • Synthesis and antibacterial activity of spongelike cationic polymeric particles
    Xiao-Ya XUAN;;;zheng-hui WANG
    . 2013, 44(13): 7-0.
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    Abstract: The epoxy-containing polymeric nanoparticles (EPPs) were synthetized by emulsion polymerization method using glycidyl methacrylate (GMA) and methyl methacrylate (MMA) as monomers, N,N-methylene bis(acrylamide) (BIS) as crosslinker, dioctyl sodium sulfosuccinate (DOSS) as emulsifier. The spongelike cationic polymeric particles (CPPs) were prepared with reaction of EPPs and trimethylamine hydrochloride. The particle size of EPP was increased dozens of times after cationization. The cationic density of CPPs were investigated by colloid titration and the chemical structure of CPP was characterized by FTIR. The antibacterial activity was investigated by shaking-flask method. The results showed that all the CPPs have inhibitory rate over 98.5% against staphylococcus aureus (S. aureus) and escherichia coli (E. coli).
  • Use of Electrical Resistivity of Concrete in Assessing State and Efficiency of Moist Curing
    CHEN Wei;;;
    . 2013, 44(13): 8-0.
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    Monitoring the state of moist curing of concrete can be carried out by measuring its electrical resistivity. The variation of electrical resistivity in the surfacial zone of concrete from the surface 1 to 5cm with different curing age and curing conditions was measured. Then the change of electrical resistivity in the surfacial zone of concrete specimen cured at different conditions for 28d, which was being immersed in water, was measured. Finally, the variation tendency of the electrical resistivity in different depth of the surfacial zone was compared and analyzed. It is shown that the difference between the average electrical resistivity in the depth of 1 to 2cm and that of 4-5cm could be used to indicate the curing state of concrete; the higher the difference, the poor the curing. The reduction of the electrical resistivity in a certain depth of concrete after immersing in water could be used to assess the curing efficiency; the higher the reduction, the lower the efficiency.
  • The Research of preparation and properties of nickel wood composites
    ;;
    . 2013, 44(13): 9-0.
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    Ni wood composites were prepared through hydrothermal synthesis while Ni(Ac)2 as Ni source, N2H4?H2O as reductant, succinic acid (C4H6O4) and DL-Malic acid (C4H6O5) as complexing agent. The structure and morphology of the composites were characterized by optical microscope, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Optical microscope results showed that Ni was distributed uniformly inside the wood cell walls. XRD results indicated that at 44.5° there is Ni(111) diffraction peak. SEM results showed that the nickel particles were laminated structure, the size distribution was quite narrow and the particle size was about 0.5-1μm. The effects of mass fraction of Ni and reaction time on mechanical and electrical properties were studied by analyzing of the universal mechanics experiment and universal avometer. The results of mechanics performance testing showed that the limit of proportion and strength of compression of composites that include 2 wt.% Ni and reaction time is 12 hours were increased by 83.42 % and 20.65 % respectively than original wood. The results of Electricity Performance Testing showed that electric conductivity were increased dramatically compared with original wood and the highest electric conductivity of the composites was 125×10-4 S?m-1 when the reaction time was 6 hours and the Ni content was 3wt. %.
  • The recognition performance of dye imprinted composite microspheres prepared with different matrix
    . 2013, 44(13): 10-0.
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    In this paper, methyl orange molecular imprinting composite microspheres were prepared trimethylol propane triacrylate (TRIM) cross-linked polymethacrylic acid (PMAA) microspheres (PMAA-TRIM), cation exchange resin, anion exchange resin, and hydroxyapatite / calcium alginate microspheres as a carrier, using KH-570 and KH-550 silane as functional monomer. The adsorption properties, imprinted efficiency, recognization properties and reuse properties of methyl orange imprinted composite microspheres were researched. The results show that the imprinted composite microspheres exhibited faster adsorption rate and larger amount of adsorption capacity for their template. The imprinted composite microspheres prepared using PMAA TRIM microspheres, cation exchange resin and anion exchange resin exhibited good recycling performance.
  • Research on the Preparation of Solvent-free Anionic Polyurethane-acrylate Emulsion and Its Film Performance
    ;;Yi-ding SHEN;;
    . 2013, 44(13): 11-0.
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    Solvent-free anionic polyurethane-acrylate emulsion was prepared by in-situ polymerization with isophorone diisocyanate(IPDI),polycaprolactone diols(PCL), 2,2-dimethylolbutyric acid(DMBA), 2-Hydroxyethyl Methacrylate(HEMA),Glycidyl Methacrylate(GMA),methyl methacrylate(MMA),butyl acrylate(BA) as raw materials.Simultaneously, effects of n(NCO)/n(OH）(R value), content of hydrophilic chain extender (DMBA) and hard-monomer (MMA) on properties of the WPUA emulsion and its films were systematically studied. It was found that the WPUA emulsion particles presented the core-shell structure, and the average particle size was 98.98 nm with narrow particle size distribution when R=1.2,w(DMBA)=3.1%, w(MMA)= 26.6%. Furthermore,the emulsion film was endowed with excellent mechanical property that the tensile strength was 17.02MPa,the elongation at break was 109% and the water absorption was 6.9%.
  • Preparation and properties of 1-octadecanol/1,3:2,4-di-(3,4-dimethyl) benzylidene sorbitol gelatinous form-stable phase change materials
    Tuo TIAN;;;
    . 2013, 44(13): 12-0.
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    A 1-octadecanol (OD)/1,3:2,4-di-(3,4-dimethyl) benzylidene sorbitol (DMDBS) composite was prepared as a novel form-stable phase change material (PCM), and the properties of the composites such as the gel-to-sol transition temperature, the latent heat and the thermal storage performance were characterized. The composite was prepared by impregnating DMDBS into OD and the maximum feasible weight percentage of OD was determined to be 94.2 wt%. The gel-to-sol transition temperature of the composite PCM was 177.4-189.8 oC, which is well above the melting point of 1-octadecanol. Differential scanning calorimeter (DSC) was used to determine the melting and freezing enthalpies of 1-octadecanol in the composite PCM and the values are 184.4 and 180.9 J/g, respectively. After 100 thermal cycles, the phase change temperature changed little, and the enthalpies reduced slightly. The microstructure of the composite PCM and xerogel were observed by SEM. The relationship between the amount of DMDBS additive and the leakage was also discussed. The thermal conductivity of the composite PCM was improved by doping with exfoliated graphite.
  • The synthesis and electron emission properities of MgO nanowires
    Ling-Jie WANG ;Zunxian YangYun YE
    . 2013, 44(13): 13-0.
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    The MgO nanowires were synthesized by Carbon thermal reduction – oxidation, and their morphologies and crystal structural were measured by SEM(Scanning electron microscopy) and XRD(X-ray diffraction). Then the MgO nanowires were transferred to the cathode electrode by printing, and the cathode were assembled with phosphor powder coated anode. The field emission (FE) measurement shows that the MgO nanowries possess high electron emission properties, that its threshold voltage is only 1.3 V/μm(1 mA/cm2) and its emission currents density can reach 2.68 mA/cm2 at electric field of 4.01 V/μm. It has a luminance with 1152 cd/m2 without reduction in 4 hours. These results suggest that the MgO nanowire can be an excellent FE material candidate.
  • Microstructure and performance of CrN/Ag film prepared in 800℃ with different Ag contents
    ; ;;;;;
    . 2013, 44(13): 14-0.
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    CrN/Ag hard coatings are prepared by DC reactive magnetron sputtering at 800℃. With the aim of clarifying the effects of Ag conentent and heat treatment on the performance of the CrN/Ag hard coating, the coating microstructure, chemical compositions and hardness are characterized by XRD, SEM, and Vickers hardness tester. The results indicate that the Ag addition leads to the roughening of the coating surface and the change of the coating growth direction from (200) preferred orientation to random orientations. A small amount of Ag addition (7 at%) can slightly improve the coating hardness, while the further increase of Ag addition (21 at%) causes dramatic hardness decrease. Pure CrN coating exihibits high oxidation resistance after a heat treatment at 700 ℃ for one hour. With the increase of Ag addition, however, the coatings show more serious oxidation. Furethermore, 21 at% of Ag addition leads to pronounced Ag diffusion to the coating surface. The oxidation and Ag diffusion result in the decrease of the coating hardness after the heat treatment.
  • Microstructure and Thermoelectric Properties of Carbon Nanotube-Carbon Fiber/Cement Composites
    Junqing Zuo;
    . 2013, 44(13): 15-0.
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    The microstructure of the cement pastes was investigated by scanning electron microscopy. Thermoelectric properties of carbon nanotube-carbon fiber/cement composites were also measured during the heating and cooling process. Results show that carbon nanotubes act as fillers, which results in a dense microstructureof cement paste, when carbon nanotube is at a low content (less than 0.5% by mass of cement). The doping of CNTs leads to a highest increase (up to 260%) reaching 22.6μV/℃ in the positive thermoelectric power of the cabon fiber/cement composites, when CNTs addition reaches 0.5% by weight of cement. Besides, the linearity and reversibility of the Seebeck effect was improved.
  • Enhancing soft magnetic properties of FeCSiBPCu amorphous alloys by nanocrystallization
    Jing-En GAO
    . 2013, 44(13): 16-0.
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    Nanocrystallization kinetics of the α-Fe phase and its effects on the soft magnetic properties of the Fe76-xC7.0Si3.3B5.0P8.7Cux (x=0, 0.3 and 0.7 at.%) amorphous alloys have been investigated in detail. It was found that a small amount of Cu additions (less than 0.3%) can suppress precipitation of the α-Fe nanocrystals and then enhance the thermal stability, whilst proper Cu additions (e.g., 0.7%) can stimulate the α-Fe nucleation due to a reduced activation energy for crystallization. The saturation magnetization of the annealed samples is closely associated with the characteristics (i.e., size and density) of the precipitated α-Fe nanocrystals. With proper annealing conditions, a large saturation magnetization value of 1.79 T was achieved in the alloy with 0.7% Cu additions due to strong ferromagnetic exchange coupling between the α-Fe nanocrystals and the amorphous matrix.
  • Study on Particle Size Distribution of CaCO3 in Jet milling/Electrostatic dispersion
    Jian-Chang Hu; ;
    . 2013, 44(13): 17-0.
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    Jet-milling is an innovational technology to prepare miro-nanopowder developed in recent two decades, while the powder which prepared by this method will form the agglomerations spontaneously to a certain extent though it has a lot of advantages. In this paper, we have developed a new method to prepare micro- nanopowder with a combination of jet-milling and electrostatic dispersion techniques. Particle size distribution of powders, which have different initial size, treated by J/E method were studied, and the size of powders vary with the time were discussed as well after J/E treatment. The research reveals the influence of charging voltage on the size distribution of the powder thus prepared and the time-effectiveness of J/E method. The results of experiments indicated preliminarily that the disperstiveness of powder treated by J/E method is proportional to the charging voltage, and the size of powder which varies with time satisfies the relationship of d=Ae^(t/B)+d0 after J/E treatment.
  • Research development of γ-Ce2S3
    Zhen-Feng ZHUGuan-Hong CHEN
    . 2013, 44(13): 18-0.
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    Different methods to stabilize γ-Ce2S3 at low temperatures are described: adding alkali metal, alkaline earth metal, heavy lanthanides, carbon or silicon, phosphate, borate, and a small amount of vanadate or arsenate precursor. Phosphate and alkali metal is explained as the more effective additive. This paper also points out that the cerium sulphide coated with oxide can improve its thermal stability and expand its application areas. Preparing cerium sulphide completely coated with oxide and cerium sulphide with liquid method is the direction of future development.
  • Influence of annealing on Structural and Photoluminescence Properties of Cr3+ Doped Al2O3 Thin Films
    . 2013, 44(13): 19-0.
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    Abstract： Al2O3 and Cr3+-doped Al2O3（0.3wt%，1wt%） thin films have been grown on Si(100) substrates by pulsed laser deposition. The as-prepared films show cubic γ-Al2O3 structure. After vacumm annealing at 800 oC for one hour, the crystallinity of the sample was improved. The annealed film presents the diffraction peaks of α-Al2O3 and γ- Al2O3.The SEM image reveals that crystal grains of the films have an average grain size of 250nm and a morphology of bar. The electron energy spectrum shows that element compositions of thin films are almost the same as the according targets. Compared with Al2O3 powder, the intensity of the luminescence peak at 386nm of Al2O3 thin films greatly enhances. This can be ascribed to an increase of oxygen vacancies in the thin films and the concentration of F2+ color centers caused by double-oxygen-vacancy absorbing electrons accordingly enhances. Compared with Al2O3 thin film, the intensity of the luminescence peak at 332nm and 398nm of the annealed Al2O3 thin films greatly enhances, which can be ascribed to an increase of the concentration of color centers (F+、F). The blue shift from 386nm to 381nm of emission peak of Al2O3 thin film after annealing is mainly attributed to release of the internal stress. The photoluminescence spectra of 1wt% Cr3+-doped Al2O3 thin film show two emission peaks at 694 nm and 646 nm, which are caused by electron transition of Cr3 + ions from to 4A2 and 4T2 to 4A2. Keywords: PLD；Cr3+-dopedAl2O3 film；photoluminescence；annealing
  • Synthesis, characterization and thermal stability of poly(hydroquinone phenyl phosphate)
    Da-Ming BAN;
    . 2013, 44(13): 20-0.
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    The flame retardant, poly(hydroquinone phenyl phosphate) was prepared by bulk polymerization with phosphorus oxychloride, hydroquinone and phenol in two step procedure. The structure of polymer was confirmed with FTIR, 1H, 13C and 31P-NMR spectrum. Thermal stability of polymer was investigated with thermogravimetric analysis. The result shows that structure of polymer is agree to expect. The polymer shows good thermal stability by giving initial decomposition temperature of 364℃; the fastest decomposition temperature of 547℃; and 36% residua at 700℃.
  • Study on oxidation modification of petroleum coke and the capacitive performance of the resultant activated carbon
    Mei-Gen DENGwang ren qing;
    . 2013, 44(13): 21-0.
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    Petroleum coke (PC) was modified by H2O2 hydrothermal oxidization. Activated carbon (AC) was prepared by activation of H2O2 modified PC at KOH/coke mass ratio of 3:1 (denoted as OAC-3). As a comparison, AC was also made by activation of PC at KOH/coke mass ratio of 4:1 (denoted as AC-4). X-ray diffraction (XRD), I2 adsorption, N2 adsorption and galvanostatic charge/discharge were used to study the influence of H2O2 oxidization on the structure of PC and the performance of the resulted activated carbon. XRD study revealed that H2O2 oxidization increased the interplanar distance of PC microcrystalline from 0.344nm to 0.351nm and decreased the microcrystalline thickness from 2.34nm to 1.86nm. The specific surface area of OAC-3 and AC-4 was 3066 and 2929m2/g, respectively. At a current density of 0.1A/g, OAC-3 and AC-4 achieved a specific gravimetric capacitance of 374.6 and 338.9F/g，respectively. Electrochemical capacitors based on OAC-3 possessed a better power performance and lower resistance.
  • Preparation and Properties of Biomass Cushion Packaging Material
    Gang LI;
    . 2013, 44(13): 22-0.
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    To solve the environmental pollution caused by the non-degradable waste of plastic packaging materials, the biomass cushion packaging materials with different ingredients have been synthesized, which are made up of straw fiber and starch as the main raw materials. The orthogonal experiment method is used to study the impact of the mass ratio of fiber and starch, the content of plasticizer, active agent and blowing agent on the compressive strength of biomass cushion packaging material. The results are as follows: the influence order of various factors on compressive strength is: plasticizer>the mass ratio of fiber and starch> foaming agent> active agent. When the contents of the plasticizer, foaming agent, active agent are respectively 12%, 0.1%, 0.3% with the mass ratio of fiber and starch being 2:5, the compressive strength can reach 0.94MPa. Through research on the impacts of plasticizer content and mass ratio of fiber and starch on the cushion performance, the cushion coefficient of the material decreases firstly and increases subsequently with the two factors rising. When the plasticizer content is 12% and the mass ratio of fiber and starch is 2:5, the smallest cushion coefficient and the best cushion performance of the material are obtained. Compared the cushion and rebound performance with EPS (expanded polystyrene), EPE (expanded polyethylene) and other packaging materials, it indicates that the biomass cushion packaging material can replace the cushion packaging materials such as EPS and EPE.
  • Effects of Photoinitiator on the Properties of Microencapsulated Optical Information Recording Function Materials
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    . 2013, 44(13): 23-0.
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    The photo-thermal sensitive microcapsule is synthesized with interfacial polymerization method, which is a new type of optical information recording and displaying function material. Effects of photoabsorption properties and concentration of photoinitiator on the polymerization and imaging density of photo-thermal microcapsule are investigated by infrared spectroscopy technology and thermal imaging technology. Results show that initiating efficiency of photoinitiator is different because of absorbability difference in the ultraviolet range, and joint application of photoinitiator ITX and 819 makes the polymerization efficiency increase. The initiating efficiency of photoinitiator first increases and then decreases with the concentration of photoinitiator. Partial dye precursor molecules are enwrapped and frozen by the polymerization production, which causes the imaging density of photo-thermal microcapsule decrease, and imaging density contrast increases gradually with initiating efficiency of photoinitiator. The optimum concentration of photoinitiator is 5-7% in microcapsule.
  • Effects of Concentration of Hydrochloric acid on Titanium dioxide nanorods
    wang bing
    . 2013, 44(13): 24-0.
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    Highly ordered TiO2 nanorod arrays were prepared on glass substrate by using hydrothermal method. The characterization of TiO2 nanorod arrays was studied by using scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis. Results showed that TiO2 nanorod arrays had highly crystallized rutile phase, better verticality on the substrate and density arrays when ratio of acid to deionized water was 1.0.
  • The crystal structure of double perovskite oxides Sr2-x□xFeMoO6
    ;Yanchun HU ;;;;
    . 2013, 44(13): 25-0.
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    The series of Sr2-x□xFeMoO6 (0≤x≤0.04) are prepared by standard solid-state reaction. The crystal structures for the ordered double perovskite oxides are investigated. The GSAS refinements of X-ray powder diffraction show that all the samples are single phase and have the I4/m symmetry. Crystal parameters of the series have obvious change with vacancy doping. The anti-site defect in Sr2FeMoO6 is 91.02% and decrease to 61.26% for Sr1.96□0.4FeMoO6. The Bragg diffraction peak information is obtained from the GSAS refinements of X-ray powder diffraction.
  • Effect of Solvent on the Structure and Optical Properties of C-axis Oriented ZnO Thin Films
    Chun-Man ZHENG ;;
    . 2013, 44(13): 26-0.
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    The ZnO films were prepared using ethanol, ethylene glycol ether or glycol ether/ethanol mixture (1:1) as a solvent system by sol-gel methods. The composition, structure and optical properties were studied by means of Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and Spectral shape. The results showed that the films prepared using three solvent systems are all hexagonal wurtzite structure with C-axis oriented. The surface of ZnO films, which prepared using glycol ether/ethanol mixture (1:1) as solvent is smooth and densification. In the visible region, the light transmittance of the ZnO thin films is about 90%, and the band gap is about 3.25 eV, which can meet the material requirements for photoelectric devices such as photovoltaic solar cell.
  • Surface modified microporous membrane as the separator of Lithium ion batteries
    ;;Qing-Quan BIAN
    . 2013, 44(13): 27-0.
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    Modified polyolefin microporous membrane was prepared as the separator for Li-ion batteries by surface radiation coating of methoxy poly (ethylene oxide) acrylate ester. The modified membrane can be well wetted by liquid electrolyte. The ion conductivity of the membrane is easily achieved by absorbing the liquid electrolyte due to the high amphoteric character surface. With the modified membrane as a separator, the graphite/cathode cell exhibited a good capacity retention.It is also found that the Li-ion cell fabricated in this manner not only has stable capacity retention, but also show good high-rate performance.
  • Study on the preparation and properties of the long afterglow luminescent Lyocell fibers
    ;;Hui-hui ZHANG ;
    . 2013, 44(13): 28-0.
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    In this paper, different coupling agents were used to modify the luminescent powder and the change of sedimentation properties of luminescent powder in aqueous NMMO solution was compared, and then a suitable titanate coupling agent was chosen to improve the dispersion stability of luminescent powder in NMMO solution. Moreover, the long afterglow luminescent Lyocell fibers were spun by the dry-jet wet spinning process. The results showed that the tensile strength of fibers was improved after the treatment of the coupling agent. With the increase of luminescent powder content, the degree of crystallinity and the thermal property of fibers were decreased slightly, whereas the initial luminescent intensity was improved. When the content of the uminescent powder was more than 10wt%, the afterglow decay-time constants of luminescent Lyocell fibers were increased significantly, and the afterglow property of fibers was improved.
  • Effect of sound-induced vibration on the sound absorption properties of three-leaf microperforated panel absorbers
    Xiao-Ling Gai
    . 2013, 44(13): 29-0.
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    In order to study the effect of sound-induced vibration on the sound absorption properties of three-leaf microperforated panel absorbers, sound absorption properties of three-leaf microperforated panel absorbers are computed based on the microperforated panel theory and electro-acoustical equivalent circuit principle. Results show that the low-frequency sound absorption properties of three-leaf microperforated panel absorbers decrease and high-frequency sound absorption properties of three-leaf microperforated panel absorbers change little considering sound-induced vibration. And the sound absorption performance curves of three-leaf microperforated panel absorbers considering sound-induced vibration are gradually closed to the condition without considering sound-induced vibration with the increasing of the mass density. Two resonance peaks moves toward low frequency region with the increasing of the pore diameter and distance of microperforated panel and moves toward high frequency region with the increasing of the perforation when other parameters keep invariant. In conclusion, the sound absorption performance of three-leaf microperforated panel absorbers is affected by sound-induced vibration and the variation degree of sound absorption performance depends on the mass density and structure parameters of microperforated panel.
  • The effect of Micro-Al2O3/Epoxy Composite on the electric field intensity of cathode triple-point junction
    . 2013, 44(13): 30-0.
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    Al2O3/Epoxy composite was prepared by solution process after Al2O3 powder was modified by KH560 coupling agent. The impact of coupling agent on microstructure of composites was studied by FTIR and SEM. The dielectric properties were measured by 4294A impedance analyzer. It was found that the interfacial of Al2O3 and KH560 forms chemical bonds. The coupling agent improves the interaction between Al2O3 and epoxy. Both the fraction of Al2O3 and KH560 have an important impact on dielectric property. Dielectric permittivity of the composite with treated Al2O3 is higher than that of composite with untreated Al2O3. Besides, the electric field intensity of cathode triple-point junction has been simulated by electrostatic field simulation. The result shows that Al2O3/Epoxy composite increases dielectric properties between ceramic and epoxy as well as decreases the electric field intensity of cathode triple-point junction.
  • Synthesis, characterization and electrochemical performance of porous SnO2 nanospheres
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    . 2013, 44(13): 31-0.
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    Porous SnO2 nanospheres have been successfully synthesized by a simple hydrothermal method without using any template and surfactant. These porous SnO2 nanospheres were orderly assembled by small nanoparticles. The morphology and structure of the products were systematically studied by means of XRD, SEM, TEM, and SAED. The electrochemical performance of the products were also investigated in detail.
  • Synthesis、characterization and properties of a new antioxidant
    . 2013, 44(13): 32-0.
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    Abstract: A highly symmetric multi-branched compound (new antioxidant) N,N, N ', N '-[ 1,4 phenylenediamine] – propionate [ 1,2,2,6,6 – pentamethyl ] piperidine alcohol ester which has not been reported in the literature , has been synthesized by transesterification using N, N, N 'N'- tetra methyl propionate - 1, 4 -phenylenediamine and 1,2,2,6,6 – pentamethyl-4-ol as starting materials, and tetraisopropyl orthotitanate as catalyst. The structure of the compound was confirmed by 1H-NMR, liquid-mass spectrometry test (LC-MS), infrared spectrum test (FT-IR), and elemental analysis . In order to study the properties of the new antioxidant, the new antioxidant、antioxidant D ( N-phenyl -β- naphthylamine)、light stabilizer GW-622 were added to the natural rubber,and made a kind of different Rubber diaphragms,and the properties of masterbatch thermooxidative, photooxidative were also determined. The results indicated that, the new antioxidant has good properties of masterbatch thermooxidative and photooxidative.
  • Strongly suppressed 1/f noise and enhanced SNR in Permalloy films using NiFeCr seeds layer
    . 2013, 44(13): 33-0.
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    Permalloy films have very low 1/f noise and high SNR using NiFeCr seeds. 1/f noise in NiFeCr/NiFe/Ta films is only 10 percent as that in Ta/NiFe/Ta films in deposited shape. 1/f noise in Ta/NiFe/Ta films would be greatly improved after 250℃ 2 hour annealing because of the diffusion in Ta/NiFe interface.While 1/f noise in NiFeCr/NiFe/Ta films would only a little reduced after the same annealing procedure.The TEM result reveals that NiFe layer has good lattice match with NiFeCr seeds layer ,and has less defects than that in Ta/NiFe/Ta films.
  • Water absorption and retention properties of Poly (acrylic acid-acrylamide)
    ;Qing-Ju LIU ;;
    . 2013, 44(13): 34-0.
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    Abstract：Superabsorbent polymer has been attracted widespread attention and application, because of its higher water absorption、better water retention and salt-resistance. The water absorption and retention of PAA-AM in salt solution of different anion and cation strength、different pH values and different soil texture was investigated. The results show that PAA- AM has a big effect on salt solution of different anion and cation strength, The sequence of influence to ionic of different valence state was trivalence > bivalence > monovalence; And optimum condition of used in environment of acid and alkali is pH value between 6 to 8; PAA-AM was put in soil and sand rate of different proportion, it can improve capability of soil water retention and soil aggregate structure; The water retention capability of infliction PAA-AM in sand is better than the other soil of same processed, so PAA-AM is more suitable for using in the soil of sand soil.
  • Preparation and electrochemical properties study of Li4Ti4.95Nb0.05O12 by improved solid phase method
    . 2013, 44(13): 35-0.
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    Adopting two-step solid phase sintering for the preparation of Li4Ti4.95Nb0.05O12 cathode materials. Their properties were studied by using X-ray diffraction (XRD), scanning electron microscopy (SEM), the charging and discharging tester and circulation current-voltage (CV) tests. The results showed that the samples with spine structure and stable charging and discharging platform, it had exhibited a uniform particle size distribution. Niobium doped lithium titanate has a good electrochemistry performance, at the charge-discharge rate of 0.1 C, 0.5 C, 1 C, 10 C, its discharge special capacity was 174.1mAh/g, 159.7mAh/g, 147mAh/g, 123.3mAh/g respectively. After 20 cycles at 10C, its discharge capacity remained at 118.1mAh/g.
  • Effect of the concentration of starting solution on morphology and photocatalytic property of BiVO4
    ;
    . 2013, 44(13): 36-0.
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    A series of BiVO4 photocatalysts were synthesized via hydrothermal process. XRD, SEM, TGA, UV-Vis diffusion spectra were employed to characterize the phase structure, morphology and optical absorption properties of the samples. Using the degradation of MB as a model reaction, the photocatalytic property of the BiVO4 was detected. Results indicated that the concentration of starting solution had an important effect on the morphological evolution and photocatalytic property of BiVO4. When c(Bi3+) was 0.01, 0.05 and 0.1, 0.5 mol/L, the obtained BiVO4 samples possessed “seaweed-like”, “cobblestone-like” and “potato-like” morphology, respectively. “seaweed-shaped” and “cobblestone-shaped” BiVO4 exhibited better photocatalytic property than “potato-shaped” BiVO4, and the decolorization efficiency of MB solution reached about 75% at 180 min. In addition, the formation mechanisms of BiVO4 with different morphology were discussed in detail.
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