30 July 2015, Volume 46 Issue 14
    

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    综述 进展
  • Progress in the research of functional modification on bionic fabrication of superhydrophobic wood
    Ming LIU ;;Jia Shanshan;;
    . 2015, 46(14): 1-0.
    Abstract ( ) Knowledge map Save
    The phenomenon of superhydrophobic surfaces in natural exists wildly, which attracted highly attention of researches at home and abroad on the area of bionic fabrication materials, for its strong hydrophobicity and self-cleaning property. The functional modification of superhydrophobicity on wood or wood products will segregate water and wood effectively, this has significance on outside long time utilization and complicated high humidity environment. This article starts from superhydrophobic phenomenon and theory, focuses on the principle methods of superhydrophobic fabrication, discusses properties, and proposes the challenge of superhydrophobic treatment on wood surface.
    • 工艺 技术
  • Research with the Influence of Rare Earth La2O3 on Microstructure and Properties of Ni plating coating on
    . 2015, 46(14): 2-0.
    Abstract ( ) Knowledge map Save
    Electro-brush plating were operated on the base material of ADC12 aluminum with alkaline copper primer，respectively fast nickel solution and fast nickel solution + Rare earth La2O3 as the working layer。The results showed that adding the appropriate amount of rare earth La2O3 can obtain better properties than without adding rare earth La2O3 into the plating solution, comparing the microstructure、component and hardness、the binding force of the coating and the matrix、corrosion resistance、friction and wear behavior of two kinds of coatings by SEM,XRD, Micro Hardness Tester ,utomatic Scratch Tester, Constant potential instrument, Abrasion Tester,etc.
  • Effect of raw composition on rheological properties of gel ink
    ; ;;
    . 2015, 46(14): 3-0.
    Abstract ( ) Knowledge map Save
    The fit and unfit quality of gel ink was influenced by apparent viscosity, yield stress, the area of thixotropic loop rheological parameter, which also matter the writing performance of gel ink. It was investigated the types of dispersed resin, the content of carbon black, the distribution of particle size on the rheological parameters of the gel ink and the dispersed resin and carbon black content on the influence of rheological parameter gel ink mathematical was fitted by mathematical method . The results showed that the large molecular weight of dispersed resin and higher content of carbon black on preparation of gel ink have a larger area of thixotropic loop, higher value of yield stress and apparent viscosity. And the area of thixotropic loop, yield stress and apparent viscosity also increase with the proportion of large particle size decrease.
  • The research of self-healing property on superhydrophobic magnesium surface
    ;;li qing
    . 2015, 46(14): 4-0.
    Abstract ( ) Knowledge map Save
    A stannate coating was fabricated on surface of AZ91D magnesium by chemical conversion treatment. The coating can go through a self-healing process by solving-reprecipitation mechanism in 3.5 wt.% NaCl solution. A superhydrophobic stannate was obtained after modifying the stannate coating with 4 h self-healing process by using stearic acid. The corrosion resistance of superhydrophobic surface was valued by corrosion test in simulated seawater. The composition of coating was analyzed by XRD, and the change of morphologies and corrosion resistance were researched by SEM and Potentiodynamic polarization in 3.5 wt.% NaCl solution. A new interpretation was provided for self-healing mechanism of stannate coating in 3.5 wt.% NaCl solution.
  • The Solar Cell Back-side Polishing Process Study Based on TMAH
    . 2015, 46(14): 5-0.
    Abstract ( ) Knowledge map Save
    the back-side polishing process based on TMAH is studied by TMAH. The experiment results show that the polishing effect of TMAH polishing is better than NaOH. The best polishing temperature is 67℃. The best isopropanol concentration is 20ml/L, the concentration of 2g/L catalyst pyrazine. With the increasing of polishing time, the solar cell conversion efficiency increases firstly and then decreased. The best polishing time is 90s; the conversion efficiency of the poly solar cell increases by 0.33%.
  • Eeffecfs of substrate surface roughness on the anisotropic magnetoresistance of Ni80Fe20 thin films
    Yu-Tao
    . 2015, 46(14): 6-0.
    Abstract ( ) Knowledge map Save
    A series of Si substrates with diferrent surface roughness were prepared by using Hall ion source to bombard the Si substracte. A series of Ta(5nm)/Ni80Fe20(12nm)/Ta(2nm) Ni80Fe20 magnetic thin films were prepared by Magnetron sputtering method. Focus on the substrate surface roughness on the film structure and the anisotropic magnetoresistance effect. Film’s AMR effect were measured using four probe method, Substrate surface roughness were measured by AFM. The results showed that with the increase in substrate surface roughness, AMR value permalloy significantly reduced, and increase the ?H.
  • Preparation of Ibuprofen’s Metal-complexing Imprinted Polymer Membrane via Radiation Polymerization
    Cong Guo;Bing Wang
    . 2015, 46(14): 7-0.
    Abstract ( ) Knowledge map Save
    Using (S)-ibuprofen-Cu(Ⅱ) complex as template, methacrylic acid as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linker and Poly-sulfone membrane as the porous support layer, (S)-ibuprofen-Cu(Ⅱ) metal-complexing imprinted polymer membrane were prepared via radiation polymerization. Through the Uv-vis spectrum study, (S)-ibuprofen, Cu(Ⅱ)and methyl acrylic acid were formed ternary complexes with the ratio 2:1:2. By scanning electron microscopy (SEM) and permeation experiment, when the solid content of poly-sulfone membrane was 17%, the morphology and performance of imprinted membrane were the best after modification. At the same time, by selective permeation experiment, it was found that compared to its chiral symmetry compound (R)-ibuprofen and structural analogues ketoprofen, the imprinted membrane only showed excellent permeability to (S)-ibuprofen.
  • Study of the effect of weak magnetic field on the decolorization of azo dye by Fe-based amorphous alloy powders
    . 2015, 46(14): 8-0.
    Abstract ( ) Knowledge map Save
    Fe-Si-B amorphous alloy ribbons were melt-spun, and the amorphous powders were made by Ball-milling the ribbons. The azo dye Direct Blue 2B was decolorized by the amorphous alloy powders. We made an elementary study towards the weak magnetic effect on the decolorization of azo dye by Fe-based amorphous alloy powders via manipulating the magnetic field intensity generated by the Helmholtz coils. It is found that within certain magnetic field intensity, increasing the intensity will result in the increase of decolorization rate. With 3980 A/m magnetic field intensity, the t1/2 was 5.0 min, which increased the decolorization rate by 40% compared with 0 A/m. With the increase of the Fe-based amorphous alloy powder dosage, the positive impact of the magnetic field on the decolorization rate was slightly improved and then stabilized. With the increase of the initial azo dye concentration, the positive impact of the magnetic field was weakened.
    • 综述 进展
  • Transforming the Behavior of Conventional Chromophores from Aggregation-caused Quenching to Aggregation-induced Emission
    . 2015, 46(14): 9-0.
    Abstract ( ) Knowledge map Save
    Conventional chromophores tend to have their fluorescence quenched in aggregate states, which is the notorious aggregation-caused quenching (ACQ) effect. The ACQ effect seriously limited the practical applications of conventional chromophores. In contrast to ACQ, a group of luminescent materials are weakly emissive or even non-emissive in solutions but highly emissive by aggregate formation. This phenomenon is termed “aggregation-induced emission” (AIE). The swiftly development of AIE materials provided a new strategy, which can elimination the ACQ effect by introducing AIE moieties to the ACQ chromophores. The converted ACQ chromophores may have new properties and can be used in new field. This review is aimed to summarize recent progress on the conversion of ACQ chromophores, such as the conversion of triphenylamine derivatives，fused cyclic compounds and rylene diimides derivatives by introducing siloles, substituted ethenes (including tetraphenylethylene, triphenylethylene and triphe-nylethylene carbazole) or triphenylacrylonitrile moieties to them. In addition, the properties and applica-tions of the new materials are introduced briefly. The development trends of this field are also prospected.
    • 工艺 技术
  • The preparation of waterproof luminous coated fabric and its properties
    . 2015, 46(14): 10-0.
    Abstract ( ) Knowledge map Save
    Abstract: Have a water repellent finish on fabric by using fluoride from water and organic silicon from agent respectively setting the concentration at 30g/L firstly,and then coated with luminous materials.Discuss the influence of two different repellent finishing agents on the coated fabric’s fastness,luminous property,washing property,waterproof property,moisture permeation property,breathability property and surface morphology.The results show that luminous coated fabric has no water repellent finish is better at fastness luminance and moisture permeation than that has,but show worse at washing ,water resistance and breathability . Luminous coated fabric that has befinshed by organic silicon from agent is better at fastness,luminance，washing and moisture permeation than that has be finshed by fluoride from water,but do worse at water resistanceand breathability.
    • 研究 开发
  • Effect of Laser Welding on the Microstructure and Properties in Weld Zone of Fe-Mn-Si Based Shape Memory Alloys
    YANG Jun
    . 2015, 46(14): 12-0.
    Abstract ( ) Knowledge map Save
    This paper studied the effect of laser welding on the microstructure and properties in weld zone of Fe-Mn-Si based shape memory alloys. The result showed that weld microstructure could be remarkably refined and the matrix strength improved greatly. In the meanwhile, larger degree of supercooling caused more stacking faults which were conducive to nucleation of ε martensite, a significant improvement of shape memory effect was obtained accordingly, and compared to matrix, it was increased by 40%~178%. In simulated oilfield medium, due to the passivate phenomenon in the weld with fine and uniform microstructure during corrosion process , at the same time also reduces the corrosion potential of the battery, the corrosion rate was decreased so that the corrosion resistance of the weld was better than the matrix.
  • The study of aluminum foam on sound insulation for generators
    Li Wei;Yu-Hai LI;;
    . 2015, 46(14): 13-0.
    Abstract ( ) Knowledge map Save
    In this paper, the noise reduction (insulation) of diesel generators is dealt with by taking the advantages of aluminum foam for the mixed frequency band noise of generators. In this study, the spectrum properties of generators were analyzed, and aluminum foam was applied with different pore structures, thickness and combination to the housing of a generator, and the comparison was made here with the results of sound insulation for generator. The results show that when aluminum foam is employed for insulation of mixed noise from generator, it is highly effective for high frequency noise, but it is not obvious for low frequency noise. The effect of noise reduction is good when using closed-cell aluminum foam for frequency higher than 500Hz; but opened-cell aluminum foam shows more effective in noise reduction for low frequency between 63-125Hz. The combination of aluminum foam and steel plate shows very effective in noise insulation of low band frequency. Maintaining a certain distance between steel plate and aluminum foam, noise reduction effect is obvious, and noise frequency band can also be reduced significantly. Keeping the distance of 20mm between steel plate and closed-cell aluminum foam with 20mm in thickness will reduce about 10-20dB noise.
  • Friction performance of TiO2-xNx film on brackets
    Zi-Qi YUE
    . 2015, 46(14): 14-0.
    Abstract ( ) Knowledge map Save
    his study investigated was to by using the radio frequency magnetron sputtering method was used to the surface of the stainless steel brackets by changing the sputtering time to prepare different samples N-doped TiO2-xNx films of different thicknesses. The film crystal structure, surface morphology and surface roughness were by X-ray diffraction, scanning electron microscopy and 2206-type surface roughness measuring instrument, respectively. By 14FW reciprocating friction and wear tester investigated TiO2-xNx film brackets friction properties in vitro.The results show that the microstructure of the Nano N-doped TiO2-xNx films is anatase, uniform and compact structure. Dynamic and static friction coefficient of different thicknesses of TiO2-xNx film brackets whether under dry or wet conditions were less than the control group. In the same moist environment, with the film thickness increases TiO2-xNx film brackets friction coefficient showed a decreasing trend. The TiO2-xNx film brackets showed a good low friction properties.
  • Adsorption of Ni2+ from Aqueous Solution by Tartrate Intercalated MgAl Layered Double Hydroxides
    Yan-Ming SHEN ;;;;;
    . 2015, 46(14): 15-0.
    Abstract ( ) Knowledge map Save
    The tartrate intercalated MgAl layered double hydroxide (MgAl-TA LDHs) was prepared by anion-exchange method. The samples prepared were characterized by XRD, FT-IR and used to uptake Ni2+ from aqueous solutions. The effects of adsorbent dosage, initial Ni2+ concertration, pH, adsorption temperature on the Ni2+ adsorption efficiency were investigated. The characters of thermodynamics and kinetics were discussed. The results showed that the adsorption capacity for Ni2+ was affected by adsorption conditions. The suitable adsorbent dosage was 2g/L, and pH was neutral. Under the above contiditions, Ni2+ adsorption efficiency was over 60% at the Ni2+ concentration upto 100 mg/L, and high temperature to improve Ni2+ adsorption rate. Adsorption process conforms to the secondary kinetics model and the isothermal adsorption curve can be described by R - P model. The adsorption process was spontaneous and endothermic, and was belonged to chemisorption.
  • Preparation of Colorless Polyethyleneimine-Silver Nanoparticles Antibacterial Agent and Their Synergistic Antibacterial Effect
    . 2015, 46(14): 16-0.
    Abstract ( ) Knowledge map Save
    Abstract: Antimicrobial activity and excellent colloidal stability are important parameters for biomedical applications of silver antibacterial. In this study, polyethyleneimine (PEI)-capped sliver nanoparticles (PEI-AgNPs) antibacterial agent were synthesized in the presence of sodium borohydride (NaBH4) and PEI by chemical reduction method. Ultraviolet spectrophotometer and SEM were used to study the influence of temperature and molar radio of PEI and Ag+ on synthesis of antibacterial agent. Moreover, in order to get the best preparation technology of PEI-AgNPs antimicrobial agent with good antimicrobial activity and excellent colloidal stability, activity of silver nanoparticles and PEI was also carried out using inhibition zones test method. The results indicated that the PEI-AgNPs antibacterial agent which had core shell structure, good antimicrobial activity and excellent colloidal stability because of PEI. The silver nanoparticles biocides with good property could be synthesized when the molar radio of PEI and Ag+ was 2:1～0.6:1 at 45°C. Meanwhile, the synergistic antibacterial effect of PEI on silver antibacterial was also revealed.
  • The Theoretical Study of Electronic Structure and Optical Properties For CoSi2 Alloy
    Fu-Chun ZHANG
    . 2015, 46(14): 17-0.
    Abstract ( ) Knowledge map Save
    The electronic structure and optical properties of CoSi2 alloy materials, were calculated by using the first-principles based on the framework of density functional theory (DFT). The calculated results revealed that there was an obvious overlap between the conduction bands and valence bands, which showed the half-metal characteristics. With increase of the U values, the energy Levels near the Fermi level were gradually split apart, the conduction and valence band shifted to the high and low energy, respectively. When U value was equal to 8.0 eV, CoSi2 alloy appeared spin-splitting phenomenon. The calculated results of charge density showed that the Co-Si bonds were mainly composed of covalent bond and part of ionic bond, which is a kind of mixed valence alloy material. Moreover, the most notable character in the CoSi2 alloy was the charge transmission from Si atoms to Co. The optical absorption spectra showed that the absorption peaks have a blue-shift, and the intensity of absorption spectra weakened with the increases of the Hubbard U values. These results indicated that CoSi2 alloy is a good thermoelectric material with certain luminescence properties.
  • Synthesis of WO3 nanonetwork and investigation of its photocatalytic activity
    Xiao-Yu HE
    . 2015, 46(14): 18-0.
    Abstract ( ) Knowledge map Save
    Due to WO3 with the band bap of about 2.6 eV, visible light can stimulate its photocatalytic activity, which greatly enhance the utilization rate of sunlight. However, the photocatalytic activity of pure WO3 nanopowder is relatively low. In order to solve this problem, most of the domestic and foreign researchers have investigated the surface modification of WO3 to improve its photocatalytic activity, whereas in situ studies of WO3 itself have been rarely reported. This project will be committed to modulate morphology of WO3 nanostuctures to improve its photocatalytic performance. WO3 nanonetworks and nanowires have been prepared in the presence of CaCl2 and Na2SO4 respectively. XRD, FESEM and TEM were employed to characterize the sample. To explore the photocatalysis originated from the structure, the photodegradation of methylene blue was carried out under simulated sunlight irradiation. The result displayed that the nanonetwork showed a higher photocatalytic activity owing to its novel hierarchical structure. Our investigation demonstrates that nanonetwork hierarchical structure can promote sunlight absorption and increase the reaction active site due to highers pecific surface area.
  • Study on solidification microstructures of the Ni-Si hypoeutectic alloy
    ;;
    . 2015, 46(14): 19-0.
    Abstract ( ) Knowledge map Save
    In this paper the Ni-Ni3Si hypoeutectic in situ composites are prepared with Bridgman directional solidification technique. Microstructure characteristic of Ni-Ni3Si hypoeutectic in situ composites are systematically investigated. The alloy with hypoeutectic composition can totally transform to eutectic form under the solidification rate R=3μm/s. When the solidification rate gets to 8 μm/s, shallow cellular microstructure can be formed beside the Ni3Si phase. The cellular microstructure is more obvious when the solidification rate is 25 μm/s. When the solidification rate reached 40μm/s, classic dendritic microstructure is observed due to the increase of the constitutional supercooling in front of the solid/liquid interface. Moreover, the supercooling is evaluated according to the supercooling criterion, and the interface growth temperature is calculated in terms of BH model. The theoretical calculation results are consistent with the experiment results. With the increase of the solidification rate, the primary dendrite arm spacing is decreased and the microstructure is refined.
  • High temperature oxidation performance of multi-arc ion plated two TixAl1-xN films on gun steel
    Ce-an GUO
    . 2015, 46(14): 20-0.
    Abstract ( ) Knowledge map Save
    Two TixAl1-xN films, by means of multi-arc ion plating technology, were deposited on gun steel substrates. Specimens were isothermally oxidized at 850 ℃ in air for 10 h, and the oxidation performance of the two films was investigated by utilizing XRD, SEM and EDS to test the microstructure. The results showed that Ti0.5Al0.5N film exhibits obviously better oxidation property than Ti0.7Al0.3N film. For Ti0.7Al0.3N film, the oxides of Fe2O3 and Fe3O4 formed on its surface due to the element Fe diffusion from the substrate, which cause the premature failure of the Ti0.7Al0.3N film. In contrast, the mixture oxides of Al2O3 and TiO2 formed on the surface of Ti0.5Al0.5N film, which showed good high temperature oxidation resistance. Meanwhile, the moderate diffusion of elements improve the adhesion between the film and the substrate.
  • Study of an energy harvester based on PZT piezoelectric thin film
    Ting-He ;
    . 2015, 46(14): 21-0.
    Abstract ( ) Knowledge map Save
    In view of the demand of current Internet and wireless sensor networks，an energy harvester was proposed based on piezoelectric effect and MEMS technology. Based on mechanical properties analysis of the piezoelectric energy harvester，design，simulation，fabrication and test of piezoelectric energy harvesters with two different sizes were described. The PZT piezoelectric thin film was statically simulated with ANSYS, and the first-order resonance frequencies of the two microstructures were 3.9kHz and 4kHz, respectively．The PZT piezoelectric thin film of the energy harvester was manufactured with sol-gel method. Electron microscope scanning the 15 and 20 layers film show the thickness is 1849 nm and 2667 nm, respectively, the comparision of the AFM surface topography the roughness 1.8nm and 2.11nm, the latter density better, smaller particles, phase transition temperature is relatively higher.
  • Effects of ‘Left Hand Materials’ on the Resonant Parameters of Resonator Cavity
    ;
    . 2015, 46(14): 22-0.
    Abstract ( ) Knowledge map Save
    "LHM" is another kind of material and its natures are inconsistent with traditional materials’. By combining theoretical calculation and simulation, the factors that affect the resonant parameters of the resonator are analyzed. The results describe the relationship between material properties of the filling medium and the resonant parameters of the cavity. Theoretical calculations show that when using the "left-handed materials" as filling materials in the cavity, the quality factor and resonance frequency can be increased without changing the size of the cavity. This has been proved by HFSS simulation. The conclusion makes the traditional theory have further progress and provides a theoretical basis for the exploration and design of novel resonator.
  • Microstructure and optical properties of Mg-doped GaN epilayers implanted with Mn ions
    . 2015, 46(14): 23-0.
    Abstract ( ) Knowledge map Save
    Ferromagnetic GaN:Mn thin films were prepared by implementing Mn ions into Mg-doped GaN epilayer. The implanted samples were examined with both Raman scattering and photoluminescence (PL) measurements to characterize their microstructure property. The Raman spectra exhibit additional excitations attributed to the vibrational mode of defects caused by Mn-ion implantation and the Mn related local vibrational mode in the vicinity of . The results of PL measurement show that new peaks at 1.69eV、2.54eV and 2.96eV emerge. The PL peak at 2.96eV is attributed to a deep MgGa-VN complexes donor-shallow Mg acceptor transition, the PL peak at 2.54eV is attributed to a shallow donor-deep acceptor transition, and the PL peak at 1.69eV may be due to a transition between MgGa-VN complexes donor level and Mn acceptor level.
  • Effect of Heating Treatment on Microstructure and Property of NL 202 SiC Fiber
    Zhi-Ming SU; ;ma-tai DING;Lin LAN
    . 2015, 46(14): 24-0.
    Abstract ( ) Knowledge map Save
    The commercial Nicalon 202 SiC fiber was exposed in thermal air to degum and heat treated in argon gas from 1100℃ to 1400℃. Change of the chemical, structural and electrical properties of the resultant fibers as a function of thermal treatment temperature were studied. The results showed that the SiCxOy phase decomposed evidently above 1200℃, which led to the formation and crystallization of SiC. With the raise of the heating temperature, the tensile strength of fiber decreased, the specific conductivity and dielectric loss of the fiber increased. Moreover, after heating at 1400℃ the fracture behavior of the fiber turned to intergranular mode from amorphous brittleness mode.
  • Preparation of CeO2 nanorods and nanooctahedrons and analysis of the growth mechanism
    fen WANG
    . 2015, 46(14): 25-0.
    Abstract ( ) Knowledge map Save
    CeO2 nanorods and nanooctahedrons were prepared throuth hydrothermal method at the tempurtaure of 180℃ using Ce (NO3)3?6H2O as start material and Na3PO4?12H2O and sodium tripoplyphosphate (Na5P3O10) as the morphological controlling agents respectively. Based on the analysis of XRD、FE-SEM and TEM, it is found that the formation and growth of the nanooctahedron due to HPO42- anions in the hydrolysis of the Na5P3O10, whereas the nanorods due to H2PO4- anions in the hydrolysis of Na3PO4?12H2O. Furthermore, only the nanorods were generated in both solutions of pH around of 2.
  • Effect of silica modification on the shape selective adsorption performance of HZSM-5
    Kai WANG;;;
    . 2015, 46(14): 26-0.
    Abstract ( ) Knowledge map Save
    Abstract: The HZSM-5 molecular sieve adsorbent was modified using polysiloxane as modifier and were characterized by means of X-ray diffraction (XRD), NH3-TPD, Surface Area and pore size analysis and Thermogravimetric Analysis(TGA). The effects of silicon deposition degree, liquid phase adsorption and gas phase adsorption process conditions on the shape-selective adsorption performance were investigated using liquid phase adsorption and gas phase adsorption . It is concluded that with the increase of deposited silica, the mesopore volune reduced, the micropore volume hardly changed and the crystal structure of adsorbents have not changed after the fourth deposition. Meanwhile the average adsorption capacities decrease while the selectivy of p-xylene increased; On the other hand, the p-xylene selectivity of the gas phase thermal desorption is higher than that of liquid desorption, and the shape selectivity of dichloromethane as desorption solution is higher than that of tolune and cyclohexane. Adsorption gravimetric test results show that the average adsorption capacity of Si/ZSM-5(0)、Si/ZSM-5(2) and Si/ZSM-5(4) were 102.1 mg/g、82.12 mg/g and 71.84 mg/g and the diffusion rate of xylene mixture decreases with the increase of deposited silica .
  • Preparation and Properties of Electromagnetic Functional Composite Membrane Based on Bacterial Cellulose
    Jin-Lu HAN ;;;
    . 2015, 46(14): 27-0.
    Abstract ( ) Knowledge map Save
    CoFe2O4/BC magnetic composite membranes based on bacterial cellulose (BC) were prepared through coprecipitation and in situ composition. Then, the flexible PPy/CoFe2O4/BC functional membranes with electromagnetivity were synthesized successfully through in situ chemical synthesis and the structure, properties and applications were investigated. The results revealed that the PPy/CoFe2O4/BC membranes remained the ultrafine network architecture of BC template. The membranes demonstrated a continue core-shell structure when the concentration of pyrrole was 0.07 mol/L. Moreover, the conductivity of composite membranes were about 0.4 S/cm and the PPy/CoFe2O4/BC composite membranes revealed a good electromagnetic shielding efficiency with the value of SE 25 dB, which indicate a good electromagnetic interference shielding material in daily life.
  • Study on Photocatalytic Property of Graphitic Carbon Nitride (g-C3N4) Hybridized TiO2 Nanometer Materials to Methylene Blue
    ;;;
    . 2015, 46(14): 28-0.
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    Graphitic carbon nitride (g-C3N4) hybridized TiO2 nanometer materials was prepared by annealing metatitanic acid and melamine. Different ratio, the roasting temperature & different roasting time was adopted while g-C3N4 degraded Methylene Blue. Mechanism of photodegradation was discussed using UV-Vis spectrometer & fluorescence spectrometer.
  • Synthesis of Pyrrole-Aniline Copolymer Sub-micron Particles toward Enhanced Super-capacitance
    Zhen-Zhong HOUQing-Hao YANG
    . 2015, 46(14): 29-0.
    Abstract ( ) Knowledge map Save
    Pyrrole-Aniline(Py-An) copolymer sub-micron particles are directly and productively synthesized by a facile chemical oxidative polymerization of pyrrole and aniline. The polymerization yield and electrical conductivity of the copolymer are significantly influenced by the comonomer ratio, polymerization temperature and oxidant/monomer molar ratio. When the copolymerization conditions is at a Py/An molar ratio of 7/3, an oxidant/monomer molar ratio of 1, and a temperature of 20 ?C, the obtained copolymer has relatively high yield(57.5 %) and conductivity(2.61 S cm-1). FTIR indicates that the copolymer chains are composed of polypyrrole and polyaniline segments, and the composition changes according to Py/An molar ratio. Py-An(7/3) copolymer is found to generally have sub-micron scale irregular granular morphology with the particle size of 300-500 nm by SEM. Compared to the homopolymer, Py-An(7/3) copolymer exhibits better solubility and pseudocapacitance performance. The results of cyclic voltammetry(CV) test show that the Py-An(7/3) copolymer possesses a specific capacitance of 256 F g-1 as well as retains 97.6 % of the initial specific capacitance after 1000 cycles.
  • Fe0.94Mn0.06PO4@MCNT composite for sodium-ion batteries via a micro-emulsion technique
    . 2015, 46(14): 30-0.
    Abstract ( ) Knowledge map Save
    Fe0.94Mn0.06PO4@MCNT was prepared by micro-emulsion technique. The structure of sample was analyzed by XRD. The analysis of morphology and composition were carried by SEM/EDS, the electrochemical performance of assembled sodium ion battery was tested by galvanostatic discharge/charge tests and electrochemical impedance spectra (EIS). The result show that the discharge specific capacity of this cathode material was up to 160.6mAh/g，147.9mAh/g，137.5 mAh/g，106.8mAh/g at 0.1C, 0.2C, 0.5C, 1C in electrochemical window of 1.5V～4.2V. Compared with FePO4@MCNT and FePO4, there is obvious improvement in electrochemical performance.
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