25 March 2011, Volume 42 Issue S1
    

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    研究与开发
  • Synthesis and Characterization of Se Nanowires
    zhaomiao
    . 2011, 42(S1): 1-0.
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    This paper introduces a green environment-friendly approach used for the preparation of t-Se nanowires with Alkaline conditions,redox reaction has been used for the synthesis of Abstract：This paper introduces a green environment-friendly approach used for the preparation of t-Se nanowires with Alkaline conditions,redox reaction has been used for the synthesis of gray black t-Se nanowires in redox system.Sucrose, dextran has been used for Agent-oriented and software templates, Preparation of a large number of selenium nanowires has been prepared with uniform size, different morphologies. The morphologies and structure were characterized using XRD,SEM. It was shown that Two different kinds of sugar has different effects on the growth of selenium nanowires,Se nanowires is typically about 6 ?m long ,80~300nm in diameter in Sucrose conditions.but Se nanowires is typically about 0.5cm long ,over 500nm in diameter in dextran conditions;It was also shown that the Se nanowires with high crystallinity were trigonal selenium and grown along [001] direction.
  • Preparation and Characterization of La9.33Si6O26 by Molten Salt Method
    ;JIA LIU
    . 2011, 42(S1): 2-0.
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    The precursor powders of La9.33Si6O26 was obtained at lower temperature (900℃) by molten salt method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the structure, appearance，and impedance spectroscopy analysiswas used to study conductivity of La9.33Si6O26. The results indicate that the apatite phase is formed. After the sintering at 1500℃, the obtain ceramic electrolyte has dense and uniform grains. The results of impedance spectroscopy tester show that the ceramic, sintered from powders synthesized by molten salt method, has higher conductivity and lower activation energy.
  • Preparation and Properties of Thermal Energy Storage and Temperature Regulation Microcapsulated Paraffin by P(MMA-co-AA)
    . 2011, 42(S1): 3-0.
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    Preparation and Properties of Thermal Energy Storage and Temperature Regulation Microcapsulated Paraffin by P(MMA-co-AA) Tong Xiao-mei1，Zhang min1，2，Zhang Hong1, Song Ling1,Ma Pan1, Qiu Jian-hui3 (1.Key laboratory of Auxiliary Chemistry & technology for Chemical Industry, Ministry of Education. School of Chemistry and Chemical Engineering, Shaan xi University of Science and Technology; Xi an,710021, China; 2. Zhe Jiang Wen Zhou Research Institute of Light Industry, WenZhou, 325003, 3. Akita Prefecture University, Akita,015-0055, Japan) Abstract: Phase change microcapsules with phase transition temperature 60 ℃, latent heat 64.2 J / g and heat storage density of 168.24 kJ ? kg-1 were prepared by interfacial polymerization. The thermal properties and permeability properties of different ratio of core to wall were focused on and the effect on storage heat was evaluated. The structure and properties of the microcapsules were characterized and investigated by using optical microscope(OM),fourier transform infrared(FT-IR), differential scanning calorimetry(DSC) ,thermo gravimetry analysis(TGA) and ultraviolet spectrophotometer. The results indicated that the microcapsules were spherical with smooth surface , average size 32μm .It has good thermal stability , be stable in ethanol, acetone while be damaged in benzene, carbon tetrachloride. It has good durability in strong acid and strong alkaline solution.The temperature regulation effect is obvious.It can be used in the construction sector.
  • Processing Optimization and Properties of Laser Cladding Fe90 Coating
    ;yan shi xing
    . 2011, 42(S1): 4-0.
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    Concerning on surface worn typical vehicle-parts made of 18Cr2Ni4WA case-hardened steel, a remanufacturing process of laser cladding Fe90 alloy powders was investigated. To analyze the dilution, the SN ratio and variance analysis methods were adopted. It indicated that the significant factors to dilution ratio are laser power and powder feed rate, the quantified relation between the processing parameters and dilution ratio was obtained simultaneously. And the principle of high microhardness was analyzed with synthesis on microstructure and phase components. Results showed that laser cladding Fe90 alloy to remanufacture worn parts can not only restore the size but also enhance the microhardness greatly, which represents an excellent service performance.
  • Preparation and multiple-band stealth properties of SmFeO3
    . 2011, 42(S1): 5-0.
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    SmFeO3 powders were prepared by solid state reaction. The phase composition and surface appearance of the obtained SmFeO3 powders were characterized by XRD, and SEM, respectively. In addition, the microwave electromagnetic properties, the infrared emissivity and the reflectivity at 1.06 μm wavelength of SmFeO3 powders were measured. The results showed that the pure SmFeO3 was formed when the calcining temperature was 1250℃, and the obtained SmFeO3 showed an orange-red color. Moreover, the particles exhibited irregular blocky shape, and the average size was about 2-4μm. For the single SmFeO3 microwave absorber, the maximum reflection loss (RL) was about -10 dB at 15. 8GHz. The RL reached -5 dB in the frequency range of 14.3-16.8 GHz. At the same time, the SmFeO3 particles not only had strong laser absorption with 0.41% reflectivity at 1.06μm wavelength but also had low infrared emissivity of 0.66.
  • Research on Orthogonal Experiment for CVD Deposition Process of SiC Filament
    Cuixia LIU ;
    . 2011, 42(S1): 6-0.
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    Orthogonal design method was used to analyse and study deposition process of SiC filament prepared by CVD method. Five process factors and four levels were focused on during the experiment design. Variance of five process factors to deposition process of SiC filament by CVD method were calculated and each factors’ significance was analyzed. The sequences of factors influencing tensile strength of SiC filament was discovered and the main factors was analyzed how to affect the deposition process of SiC filament.
  • Constant potential induced self-assembly of silica films and their optical properties
    dong zheng
    . 2011, 42(S1): 7-0.
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    Silica films were prepared on the surface of FTO conductive glass by constant potential induced self-assembly technique at 40℃, 2.5 V . Growth condition, structure, morphology and optical properties of the films were respectively demonstrated, by cyclic voltammograms (CV), infrared spectrometer, scanning electron microscope (SEM), UV-Vis spectrophotometer and fluorescence spectroscopy. Results show that silica films can be formed only if the concentration of CTAB solution is equal or greater than its critical micelle concentration or the concentration of TEOS reaches a definite extent. By fluorescence spectra, it was concluded that SiOx film was formed after calcination. Due to the formation of oxygen vacancy, the films emmited 2.5 eV light under the excitation of 3.8 eV incident light.
  • Templating fabrication and magnetic properties of branched Ni nanowire arrays
    ;Lirong Qin ;
    . 2011, 42(S1): 8-0.
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    Anodic aluminum oxide (AAO) template with Y-branched nanoholes was first prepared by a three-step anodic oxidation. Then, well aligned branched Ni nanowire arrays were fabricated in the as-synthesized template by direct-current (DC) electrochemical deposition method. The structure and morphology of the product were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Investigation results demonstrate that the synthesized Ni nanowires were parallel in symmetrical distribution and showed Y-branched structures. The “stem” and the “branches” of the branched Ni nanowires were about 75 and 50 nm in diameter, respectively. Magnetization measurements on the array of the Ni nanowires revealed an obvious Magnetic anisotropy. So the branched Ni nanowire arrays synthesized here had promising technological applications in perpendicular information storage and nanoelectronic devices.
  • Effect of Process Parameters of Ball Mill on Stability of Nanometer CeO2 Suspension in Dispersion Medium of Water and Alcohol
    ; Hongyu WANG;
    . 2011, 42(S1): 9-0.
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    In this work, the planetary mill was used to disperse nanometer CeO2 particles in the dispersion medium of water and alcohol. Precipitation rate (PR) and its varied quantity (PRVQ) were introduced to evaluate the stability of CeO2 suspension. Effect of ball milling time (BMT), ball to powder ratio (BPR), milling speed (MS) and theoretic mass fraction (TMF) of CeO2 particles on stability of CeO2 suspension was discussed. In terms of the crushing force opening the agglomerates, the effect of BMT was discussed. And in the respective of crushing frequency of particles, the effect of BPR was evaluated. MS was the significant factor of the division of the milling force and the impact force. The selections of TMF and BPR need to give consideration to dispersion stabilization, energy efficiency and PR in a comprehensive way.
  • Preparation of the modified resin by cationic surfactants and treatment of steel rolling emulsified oily wastewater
    Fang-wen Li ;
    . 2011, 42(S1): 10-0.
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    Modification of strongly acidic styrene type cation exchange resin (001×7) by cetytrimethyl-ammonium bromide and its oil and turbidity removal performances from real steel rolling oily wastewater were investigated. The orthogonal experiment was used to optimize the modification process. At the same time, the original and modified resin was characterized by FTIR, TG and SEM. The results showed that the best modification process parameters included mass ratio between resin and CTAB (4:1), temperature (60℃), reaction time (5h) and reaction solvent (secondary distilled water). The grafting quantity reached 0.17mmol/g at the best modified process. Proofs of CTAB successful grafting to resin included the characteristic adsorption peak from modified resin at 1487.69cm-1 that was brought out by bending and deforming vibration of C-H bond from quaternary ammonium group, lower weigh loss rate of R-CTAB than that of R-H before 250℃, breakdown and void from R-CTAB that were answerable to heat stability reduce. Compared with R-H, the oil and turbidly removal rate of R-CTAB were all above 98%, which increased by 31.7% and 8.0% respectively. Fatherly, the higher removal rate could keep constant at operation period.
  • Study on the Electrodepositing Technology of Fe-Co Alloy Foil
    . 2011, 42(S1): 11-0.
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    In this paper the technology of Fe-Co alloy foil electrodeposition from sulfate-chloride-tartaric acid electrolyte was investigated. The influences of current density, temperature, pH value and the constituents of the electrolyte on the compositions and the depositing rates of the alloy foil were discussed. The optimum technology of the electrodeposition was determined. The excellent Fe-Co alloy foils with thickness of 40～45μm and Fe content of 12.8～33.5% were obtained. The morphology and the structure of Fe-Co alloy foil were measured and analyzed by means of SEM, EDS and XRD. The results show that the alloy foil surface is bright and smooth. The crystalline grains are fine, uniform and compact. The crystalline structure of the alloy foil is the Fe-Co solid solution faced center cubic (FCC), it shows (111), (200), (311) and (222) crystal texture with the (111) and (200) preferred orientation.
  • Study On Cu-based Electrical Contact Materials By Warm Compaction
    FENG Sha sha;GENG Hao Ran
    . 2011, 42(S1): 12-0.
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    Abstract: A series of experiments were carried out on warm compaction and conventional compaction of Cu-based electrical contact materials. The optimal parameters of warm compaction were determined by analyzing properties of the samples. Results show that, in the same pressure, the resistivity, hardness and antioxidant of samples made by warm compaction are obviously better than those of conventional compaction. The optimal pressing temperature is 130℃, the optimal content of the lubricant is 0.7%( mass fraction).
  • Cushioning Dynamic Model for Double-layer Medium Corrugated Paperboard Packaging System and Damage Evaluation
    ;
    . 2011, 42(S1): 13-0.
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    The compression deformation behavior of double-layer medium corrugated paperboard was investigated and modeled. Then, the dropping dynamic model of the cushioning system was built, and the motion equation of the system was obtained and analyzed by Runge-Kutta method. The response characteristics of the system were discussed, and the concept of dropping damage boundary was applied to predict the dropping damage of corrugated paperboard. The effect of fragility of product and damping of cushioning pad was also discussed.
  • PORES CHARACTERISTICS AND MECHANICAL PROPERTIES OF POROUS Ti-Nb-Zr ALLOY
    Yuxun Li;;Xian-Jin YANG;S.L. Zhu
    . 2011, 42(S1): 14-0.
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    One of the effective ways to reduce the elastic modulus of alloys is porosity. This paper mainly study on porous TiNb24Zr4 with pore-forming agent (NH4HCO3) addition. The alloys were examined by optical microscope, X-ray diffraction (XRD), scanning electron microscopy (SEM), three-point bending and compression tests. Image analysis method was used for analyzing the pore characteristics of porous alloys. It is found that the alloys are near β type Ti alloys. The porosity of the alloys is decided by the amount of the pore-forming agent. The compression modulus and the yield strength of TiNb24Zr4 within 20wt.% NH4HCO3 are 3.3GPa and 172MPa, respectively. The young's modulus and strength of porous TiNb24Zr4 alloy are suitable for the applications of implant materials. The fracture mechanism of the alloys exhibits brittle fracture, as called intracrystalline failure.
  • Ag-based Transparent Conducting Multilayer Thin Films: the Role of Interface
    Xiao-Feng ZHANG
    . 2011, 42(S1): 15-0.
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    Ag-based transparent conducting multilayer thin films have been widely applied to Low-E windows, high-performance electromagnetic shielding, low power-consuming optoelectronic devices due to comparatively low sheet resistance, low deposition temperature, cost-effective raw materials and good mechanical process-ability. Several disadvantages, such as strongly surface plasmon resonance at the interface between the metal and dielectric layers, strongly scattering for conducting electrons from rough interfaces, delaminating cracking in the multilayer have been found in the fabricating and serving processes. In this paper, several problems involved and recent progress recently would be reviewed from different points of view. Finally, prospects in this field were suggested for the future.
  • The preparation of porous alumina ceramics with directional pore channels structure by a camphene-based freeze-casting
    Bo-Tao LIU;;;
    . 2011, 42(S1): 16-0.
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    The porous alumina ceramics was prepared by freezing the slurry system，which was constituted of camphene, alumina powder and Texaphor 963, then induced by temperature gradient, followed by drying and firing. The resultant porous ceramics had unique directional pore channels structure, high porosity and high compressive strength. The scanning electron microscope was used to observe its internal structure. The porosity, compressive strength and shrinkage of the porous ceramics were tested respectively. The results show that the solid loading of the slurry and sintering temperature have remarkable effects on porosity, compressive strength and shrinkage of porous alumina ceramics, freezing temperature and sintering temperature have greater influence on pore size distribution and fracture microstructure of porous alumina ceramics. The porous ceramics with directional pore channels structure can be prepared by a camphene-based freeze-casting technique, by adjusting process parameters to control the pore structure and properties of porous ceramics, in order to meet different needs of the user.
  • Effects of sintering temperature on properties of WC-TiC-TaC-Co Cemented Carbide
    Jia Yang
    . 2011, 42(S1): 17-0.
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    Abstract: In this study, WC-TiC-TaC-Co cemented carbide was sintered by lowpressure sintering at the different sintering temperature. The micorstructure and mechanical properties of alloy were analyzed by metallographic microscope, X-ray diffraction and scanning electron microscopy. The results demonstrated that three-phased alloy WC+（WC-TiC-TaC）+γ could be formed by the method of lowpressure sintering. In addition, results reveal the best overall performance was abtained at 1475℃: Density, Vickers hardness, bending strength and fracture toughness were: 13.14g/cm3,1843HV30,1707Mpa,9.18Mpa·m1/2 respectively.
  • Preparation and Optical Properties of CuInS2 Thin Films
    . 2011, 42(S1): 18-0.
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    Vacuum co-evaporation method was utilized to obtain CuInS2 thin films on glass substrates. The effects of different Cu-In-S mixed ratios and heat-treatment process under various conditions on the structure, stoichiometry, optical properties of CuInS2 films were studied. Experimental results show that appropriate S atomic ratio, defined as X, is an important factor. In this paper, X value was chosen in range from 0.2 to 2 and the optimal ratio of Cu-In-S is 1:0.1:1.2. The thin films, which were deposited under the optimal ratio, show chalcopyrite structural of CuInS2 and (112) preferred orientation by method of heat-treatment in N2 for 20mins at 400℃. The morphology of the thin films after heat treatment is compact and homogeneous. The average grain size, thickness and surface roughness are 38.06nm, 454.8nm and 13nm, respectively. Stoichiometry of elements in thin film is 1:0.9:1.5. The absorption coefficient is 105 cm-1and the optical band gap is 1.42eV.
  • Protein adsorption behavior on the methoxy-polyethyleneoxide-propyl-trimethoxysilane modified silicon surfaces
    ;
    . 2011, 42(S1): 19-0.
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    The silicon substrates were modified by methoxy-polyethyleneoxide-propyl- trimethoxysilane to improve their surface hydrophilic properties. The BSA adsorption behavior on the modified substrates immersed in BSA solutions with different time and different initial concentration of BSA was investigated by the comassie bulliant blue(CBB) method. The results show that the protein dasorption is a dynamic process, which is consistent with Langmiur theoretical adsorption model, after soaking by 120min, the adsorption process reaches a dynamic equilibrium. When the initial concentration of BSA reaches 0.04mg/mL, protein adsorption achieves its maximum, no longer changes as the solution initial concentration changes, the biggest protein adsorption of silicon surfaces separately modified by silane of Mn=442 and Mn=882 are 90.41μg/cm2 and 85.76μg/cm2, respectively. AFM analysis shows that blank silicon substrates adsorp more protein with the highest protein layer thickness up to 24.81nm. The modified silicon substrates have a better resistance to protein adsorption, with less protein adsorping on their surfaces, the highest protein layer thickness on the silicon surfaces separately modified by silane of Mn=442 and Mn=882 are 19.20 nm and 16.2nm, respectively.
  • Microwave-assisted synthesis and characterization of 1,3-di(n-butyl)imidazolium hexafluorophosphate ionic liquid
    . 2011, 42(S1): 20-0.
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    The intermediate [DnBIM][Br] was synthesized from trimethylsilyl imidazole and 1-Bromobutane under microwave radiation without organic solvent by quaternization reaction, the yield can reach 92%.Then [DnBIM][PF6] was prepared using [DnBIM][Br] and KPF6 by replacement reaction, the yield is 68%.The reaction time of the proposed method greatly reduced. The structure of the synthesized product was confirmed by FT-IR, 1HNMR, 13CNMR and elemental analysis, and the purity of the product was determined to be above 96.0 % using high performance liquid chromatography.
  • Design of a New Composite Launcher Tube
    ;;
    . 2011, 42(S1): 21-0.
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    Abstract: Selected T300/SiC ceramic matrix composites （CMCs）and carbon and glass hybrid fiber reinforced polymer（HFRP） composites as material, Designed a lightweight launcher tube which can be used repeatedly. Established the finite element model of new launcher tube, the simulation calculation of rocket launching was carried out. Compare with metal launcher tube and glass fiber reinforced plastics launcher tube, the results indicate that the stiffness and strength of new type launcher tube can meet the requirements。The new type launcher tube had a good performance with the weight was only 24.36% of the metal launcher tube, and it can be used repeatedly, the new type launcher tube can very good meet modern martial requirements.
  • Characteristics of high energy milled Mo–3wt%Cu nanocomposite powders
    HU Bao-Quan
    . 2011, 42(S1): 22-0.
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    Abstract:：Mo-3wt%Cu ultrafine composite powder was prepared by mechanical alloying process, Systematic investigeation were carried out on the structural change. Surfacial characteristic and thermal stability of the Mo-3wt%Cu high energy milled powders using a combination of X-ray powder diffraction, brunauer-emmett-teller(BET)nitrogen adsorption technique and differential thermal analysis assited by DTA. The experimental results showed that ball-milled could produce an ultrafine composite powders in which large lattice distortion, supersolidus solution and solubility extension of Mo in phase were occurred due to the fast diffusion induced by high density of lattice defects and nanograin boundaries. BET results provide a further evidence that milling led the specific surface area of powedrs surface meso pore, pore size to decrease and micro pores to produce.
  • The new thermogravimetric analysis method in the process preparing samples
    Gui-De TANG ;;;;;
    . 2011, 42(S1): 23-0.
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    A thermogravimetric analysis method with tracking every steps prepared perovskite manganite to confirm the mass loss of some special doped elements in the process preparing samples was proposed. Perovskite manganite with nominal composition La0.7Sr0.3-xAgxMnO3 and La0.6Sr0.1Te0.2MnO3 were successfully prepared by the sol-gel method. The weight of the residual samples was weighed after various heat treatment step with an accuracy of 0.0001g of electronic balance. The main errors have been excluded carefully, such as drying the samples in the drying oven before weighing to avoid errors caused by deliquescence, etc. The results show, that there is no apparent loss of Ag for the sample La0.7Sr0.1Ag0.2MnO3 after heat treatment at 1073K; all of the Te and a few of the Mn ions were lost completely from the sample La0.6Sr0.1Te0.2MnO3 calcined at 1473 K.
  • The ablation study on Ag film by femtosecond laser
    ;Zhou Ming
    . 2011, 42(S1): 24-0.
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    Abstract: The laser damage studies performed by femtosecond laser on Ag film were presented. Scanning electron microscope was applied to observe the ablation morphology of surface.It shows that ablation dot can be roughly divided into three regions, ablation area increases with the increase of pulse energy, pulse number,but the ablation area has little change after the pulse number reaches a certain value. Periodic striped structures with period of 650 nm and 150 nm are produced at the ablation dots with the change of pulse number.The thresholds for single pulse and multi-pulse can be obtained from the relationship between the ablated area and the pulse energy.The thresholds of Ag film for single pulse is 0.189J/cm2. From the plot of accumulated laser fluence and the number of laser pulses , multi-pulse incubation coefficient of Ag film was obtained,s=0.785.
  • Synthesis and characterization of folate receptor targeted poly(L-alanine)-monomethoxy polyethylene glycol copolymer
    ;
    . 2011, 42(S1): 25-0.
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    Poly (L-alanine)-monomethoxy polyethylene glycol (PLAM) was polymerized via NCA ring opening polymerization method using MPEG-NH2 as macroinitiator. Then, folate was coupled to PLAM to obtain folate-poly (L-alanine)-monomethoxy polyethylene glycol(FOL-PLAM). The structure of product was confirmed by FTIR and 1HNMR. Furthermore, the critical micelle concentrations (CMC) of PLAM and FOL-PLAM copolymers were determined by pyrene fluorescence probe technique. The folate coupled polymer prepared by this paper would be expected to be used as drug carriers for targeted drug delivery.
  • Preparation of VO2/Mica Composite Powder by Carbothermal Method
    Jing-Han CAI;Wan-xia Huang
    . 2011, 42(S1): 26-0.
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    Vanadium pentoxide were coated on mica by sol-gel and spray drying method, grinded with carbon black, and then the VO2/Mica composite powder were obtained by high temperature carbothermal annealing. The characteristics of the VO2/Mica composite powder were analysed by XRD, SEM and FTIR. The results suggested that the thermochromic VO2/Mica composite powder prepared by carbothermal method have phase transition temperature of 68℃, hysteresis width of 10℃, and the change rate of infrared transmittance between the phase transition reaches 26% at the wavenumber of 2200cm-1.
  • Transmission characteristics and and numerical simulation of reciprocal MORE of ferrofluid
    ;;;
    . 2011, 42(S1): 27-0.
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    Magneto-optical rotation effect of water-based ferrofluid is investigated by experiment and simulation method. Magneto-optical rotation effect of ferrofluid exposed to the steady magnetic field, single pulse magnetic field and continuous square wave magnetic field are conducted on the experimental platform. The experimental results show that the vibration direction of the polarized light does not depend on the magnetic field direction for ferrofluid film. The pulse response of ferrofluid is a biexponential process. The transfer functions of ferrofluid MORE is deduced based on the pulse response method. The transfer function is simulated by numerical simulation and the results verified the validity of the transfer function.
  • The Effect of Doping Ion on the Capacitance Behavior of Electropolymerized-PANI
    ;;;Xiaoping ZHANG ;
    . 2011, 42(S1): 28-0.
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    The in-situ electropolymerized-polyaniline(PANI) film (thickness: 5~10 μm) on SS (stainless steel) doped with various conterions ClO4-, SO42-, NO3-, BF4-, p-toluenesulfonate (TsO-) etc. was prepared. SEM(scanning electron microscopy) morphologies showed that different doping conterions have great impact on the morphology of electropolymerized PANI film, various morphologies and microstructures of porous, particle and fibrillar were observed. The cyclic voltammetry (CV) measurements of PANI-SS electrodes showed that the electropolymerized-polyaniline doped with SO42- (PANI-SO4) and ClO4- (PANI-ClO4) electrodes have more specific capacitance. Galvanostatic charge-discharge tests indicated that the specific capacitance of electropolymerized-PANI doped with different ions at a current density of 2.0 A·g-1 was 645.6 F·g-1, 468.3 F·g-1, 345.8 F·g-1, 275.6 F·g-1, 218.6 F·g-1, respectively. However, after 1000 cycles, about 48% and 23% specific capacitance loss for PANI-SO4 and PANI-ClO4 were observed, indicating that the PANI-SO4 electrode was much stable than the PANI-ClO4 electrode.
  • Preparation of La0.7Sr0.3NiO3/Chitosan/PPY/Hb Modified Glassy Carbon Electrode and It Use as Hydrogen Peroxide Biosensor
    ;
    . 2011, 42(S1): 29-0.
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    A uniform film of polypyrrole was electrochemically polymerized and immobilized on the surface of glassy carbon electrode(GCE), and a layer of La0.7Sr0.3NiO3 and chitosan(CS) composite film was absorbed on the surface of PPY film. Preparation of the enzyme modified electrode ,used as biosensor for determination of H2O2 ，was finally completed by immobilization of the bovine hemoglobin(Hb) on to the surface of La0.7Sr0.3NiO3 /CS/GCE. The modified electrode were characterized with cyclic voltammetry (CV) and scanning electron microscope (SEM). The biosensor displays excellent catalytic activity and rapid response for H2O2 . The linear range for the determination of H2O2 is from 7.0×10-6 to 1.5×10-3 mol/L with a detection limit of 9.0×10-8 mol/L.
  • A selection and optimization experimental study of additives to thermal energy storage material sodium acetate trihydrate
    . 2011, 42(S1): 30-0.
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    In order to solve the problem of supercooling and phase segregation of sodium acetate trihydrate during solidification, it is necessary to add appropriate nucleating agent and thickeners. Five commonly used nucleating agents, i.e. Na2HPO4?12H2O, Na3PO4?12H2O, Na2CO3?10H2O, Na2SiO3?9H2O and Na2B4O7?10H2O, three thickeners, including carboxymethyl cellulose and gelatin, and polyacrylamide were selected as additives to improve the phase-change energy storage property after the research and comparison. Sodium acetate trihydrate as an energy storage medium, nucleating agent and thickeners were assorted randomly to configure sample. The heat storage-release experiment was conducted. Finally several effective additives are developed, and the mass ratio of these formulas were studied experimentally. The best two dosage formulations were found.
  • Self-cleaning diamond composite materials in wastewater treatment research
    ;LI Xiao Wei
    . 2011, 42(S1): 31-0.
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    In this study, self-made wastewater treatment components, respectively, with the titanium film and diamond composite film process Disperse Blue 2BLN solution. Comparison of different electrode processing water COD, high performance liquid chromatography with two electrodes on the organic matter to determine the processing power. The results show that diamond complex films with self-cleaning ability to do more when the anode, better maintenance of membrane permeability. Extend the life of the metal film and improve the utilization of the metal film.
  • Preparation and Cycle Performance of Sn-SnOx/C Composite Electrode for Lithium-ion Battery
    REN Hai Juan; ;
    . 2011, 42(S1): 32-0.
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    Abstract：Sn-SnOx/Carbon composite material was prepared by a carbothermal method wherein carbonisation of mixture of tin oxide (SnO2) and sodium carboxymethyl cellulose (CMC-Na) at 450oC resulted in the simultaneous formation of carbon and Sn-SnOx nano-particles. The composite material was characterized by XRD, SEM/EDS, BET and electrochemical tests. Nano-particles of Sn-SnOx were well dispersed inside the formed carbon composite by the SEM images. The electrochemical tests showed that the initial reversible capacity as high as 600mAh/g was obtained at a charge-discharge current density of 100mA/g. Moreover, good cycle performance of the electrode was achieved that high capacity of ca. 376mAh/g was kept even after 50 cycles of charge-discharge.
  • The Influence of Graphite Oxide Structure on the Capacitance Properties
    Lin-Jiang Li; ;;;
    . 2011, 42(S1): 33-0.
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    The paper focuses on the influence of layer structure of graphite oxide, crystallinity, and the content of surface functional groups on the electrochemical capacitance performance. Graphite oxide (GO)samples as electrode materials were prepared by modified Hummer method using spectroscopically pure(SP) graphite and chemically pure(CP) graphite as precursors. The surface chemistry of the resultant GO samples were studied by XPS and FT-IR spectrum, and the structure of GO samples were tested by XRD, FE-SEM and the nitrogen adsorption at 77 K. Their electrochemical properties were investigated by charge-discharge of constant current, cyclic voltammetry, impedance spectrum and so on. The results showed that the specific capacitance of the supercapacitors made by SP GO was lower, and the maximum was 18.8 F?g-1; Then CP GO was processed by ball milling, the specific capacitance of the samples raised, and the maximum was 119.7 F?g-1.
  • Study on the Preparation、Characterization and Performance of TiO2-N-S Photocatalyst
    YU Xiu juanCHENG Xiu Wen;
    . 2011, 42(S1): 34-0.
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    Nitrogen and sulfur co-doped TiO2 photocatalyst (label as TiO2-N-S) was prepared by a sol-gel process using cystine as doping agent. The samples were characterized by the methods of X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and surface photovoltage spectrum (SPS) and the performance of the samples was tested by degradation for phenol solution under simulated sunlight irradiation. XRD analysis showed that the as-prepared modified-catalyst was absolute anatase and co-doping with nitrogen and sulfur could efficiency restrain the growth of crystalline grain and enhance the temperature of phase transformation. XPS analysis displayed that sulfur existing as cationic S6+ by replacing Ti4+ and the structure of nitrogen was broadening which could be attributed to the formation of O-Ti-N and Ti-N-O and also the content of the surface hydroxyl groups was remarkable increased. The light absorption band edge of TiO2-N-S in the visible-light region was clearly observed according to SPS analysis. Under the simulated sunlight irradiation with 120min, the 79.3% degradation rate of phenol could be achieved.
  • Preparation of Nano-zirconia Compositive Powder by the Homogeneous Co-precipitation Method
    CHEN Xiang Ge
    . 2011, 42(S1): 35-0.
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    Abstract：Nano-zirconia has been prepared by homogeneous co-precipitation method in the Rotating Packed Bed(RPB) using ammonia and zirconium oxychloride as the materials. The precursor and powder were characterized by means of TG-DTA, XRD, TEM and BET. The influences of rotating-speed, the dehydration process with alcohol and the heating-temperature on granularity, dispersion and crystalline type of nano-zirconia were studied. The results show that the tetragonal Nano-ZrO2 with less hard-agglomeration and narrow distribution can be obtained under the given process conditions: the rotating speed is 1800rpm, the process of dehydration with anhydrous ethanol is adopted and then heat treatment at 550℃. In this paper, The comparison between the process of dehydration with anhydrous isopropyl alcohol and anhydrous ethanol is made, the influences of micro-mixing on powder granularity and the mechanism of phase transform from tetragonal to monoclinic are discussed.
  • Investigation on magnetoresistance of La2/3Sr1/3Mn1-xCuxO3
    Bian-Fang ZHANG
    . 2011, 42(S1): 36-0.
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    La2/3Sr1/3MnO3 polycrystalline powers were prepared by sol-gel method. The magnetic property of powders was characterized using Vibrating Sample Magnetometer. The phase structure was presented by X-ray diffractometer. In addition, the morphology of the powders grain was observed by Scan electron microscope. Under an applied magnetic filed of 1.8T, the maximum value of MR is －40.5% for the sample with x=0 at 370K. Since Cu2 + incorporation, not only for the magnetic properties of perovskite inhibited, but also to reduce the magnetoresistance effect.
  • Studies on Glycosylated Albumin as Drug Carrirer for Nanoparticles
    ;;;
    . 2011, 42(S1): 37-0.
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    Glycosylated albumin was prepared though Maillard reaction. The effects of several factors, including preparing method, humidity, types and pH of the buffer solution, temperature, reacting time, on the degree of graft(DG), content of the melanoid(A420), emulsifying stability(ES) of the modified albumin were examined and discussed respectively. Fluorescence quenching method was employed to compare the interaction features of glycosylated albumin or albumin with folic acid. The preparation factors were set and it was found by fluorescence quenching that the interaction with folic acid was strengthened and the binding sites increased. As the carrier of hydrophobic molecules, glycosylated albumin has the great potential in improving the capability of drug loading and targeting.
  • Magnetoelectric Effect in Laminate Composites FeGa/BTO/FeGa
    Lei WANG
    . 2011, 42(S1): 38-0.
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    After prepared in argon by induction melting, polycrystal FeGa alloy rods were prepared in directional solidification furnace. Magnetostrictive behabior has been measured by using standard strain gauges. Layered composites FeGa/BTO/FeGa were fabricated by bonding the discs of the BaTiO3 and FeGa. The magnetoelectric (ME) effect have been characterized for the transversely magnetized and transversely polarized transverse-transverse (TT) mode. Near the natural resonant frequency (~95 kHz) of laminate, the ME effect were found to be dramatically increased, 7-10 larger than the properties in low frequency. The ME voltage varied evidently with magnetic bias and there existed an optimized magnetic bias 750 Oe, due to the change of FeGa piezomagnetic coefficient q with the bias field. A linear coupling between the measured ME coefficient and Hac for laminate was observed for various magnetic biases. In addition, higher magnetoelectric coefficient can be obtained by decreasing thickness of the BTO layer.
  • Influence of synthesis temperature on the electrochemical properties of LiFePO4/C composites with self-produced FePO4 as iron source
    . 2011, 42(S1): 39-0.
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    Nano-FePO4·1.5H2O was synthesized from FeSO4·7H2O，H3PO4，H2O2 and NH3·H2O. LiFePO4/C cathode material was then prepared at different temperatures by carbothermal reduction method using homogeneous mixture of Li2CO3, glucose and FePO4·1.5H2O. The structure, morphology and electrochemical properties of the samples were tested by X-ray diffraction (XRD), scanning electronmicroscopy (SEM), Cyclic voltammetry(CV) and galvanostatic charge-discharge test. The results showed that the LiFePO4/C composites synthesized at 800℃ for 12h had optimal electrochemical properties and exhibited a initial discharge capacity of 142.7mAh/g at 0.2C（1C=150mAh/g）rate, there is almost no capacity fading after 20 cycles.
  • Synthesis and Properties of resin for Adsorption of Oil Fume
    Yi-Lei HUANG;
    . 2011, 42(S1): 40-0.
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    Porous resins for adsorption of oil fume were prepared via suspension polymerization. The effects of crosslinking degree, components and the dosage of porogen agent on the properties for adsorption of oil fume were investigated. The results showed that the optimum synthesis condition were 10 parts by weight of DMA, 90 parts by weight of TRIM, 90 parts by weight of toluene, 10 parts by weight of n-heptane. The adsorption amount of porous resin reached to 0.305g/g. Langmuir and Freundlich models were used to correlate the experimental data, respectively. Additionally, the mechanism of adsorption for oil fume was discussed. The results showed that the experimental data were found to fit well by Langmuir model, which indicated that the adsorption process mainly based on monolayer adsorption and pore-filling was the dominating mechanism for oil fume adsorption.
  • Synthesis and characterization of dendritic hperbranched polyester based on divergent method
    . 2011, 42(S1): 41-0.
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    Using the divergent method, the first and the second generation of dendritic hperbranched polyesters were synthesized based on Trimethylolpropane, Phthalic anhydride and Glycerol. The reaction condition and characteristics were studied by measuring and analysing. This dendritic hperbranched polyester had controllable and accurate structure with a large of end groups modified easily. It possessed low viscosity and good thermal stable characterization. The results indicated the dendritic hyperbranched polyester as a good macromolecule material would have an extensive foreground applied in the field of UV coating and adhesive.
  • Study on the adsorption behavior of the binary compositing energy-storage sol
    . 2011, 42(S1): 42-0.
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    In order to get the smart textile with thermo-regulated property, two kinds of energy-storage materials was used to prepare the binary composite energy-storage sol by sol-gel process. The silicon-molybdenum blue method was adopted to study the adsorption behavior of the binary composite energy-storage sol to cotton fabric, which based on Freundlich and Langmuir adsorption models. The results showed that Langmuir adsorption model was suitable for the adsorption of the binary composite energy-storage soll in cotton fabric. The reaction of the adsorption was a first-order process, the absorption rate constant and the activation energy was obtained. The treated fabric presented an excellent thermo-regulated performance.
  • MICROWAVE DIELECTRIC PROPERTIES OF CERAMICS BASED ON (1-x)(Mg0.9Zn0.1)TiO3-x(Ca0.61La0.26)TiO3 SYSTEM
    . 2011, 42(S1): 43-0.
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    The microstructures and the microwave dielectric properties of the (1?x) (Mg0.9Zn0.1)TiO3–xCa0.61La0.26TiO3 (MZCLT hereafter) ceramic system were investigated. The objective of the present work is to compensate for the negative temperature coefficient of resonant frequency of (Mg0.9Zn0.1)TiO3 by the addition of (Ca0.61La0.26)TiO3. MZCLT ceramics exhibited mixed phases of (Mg0.9Zn0.1)TiO3 and Ca0.61La0.26TiO3 as the main phases associated with minor phase of (Mg0.9Zn0.1)Ti2O5. With increasing x, the dielectric constant increased and the quality factor Q?f decreased. For x=0.15, the MZCLT exhabites excellent microwave dielectric properties: εr=25.59，Q?f=96,000GHz and τf =+1ppm/℃ at 1325°C .
  • The spontaneous magnetostrictive of Gd2Fe14Cr3 compound
    . 2011, 42(S1): 44-0.
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    The thermal expansion behaviors and spontaneous magnetostrictive of Gd2Fe14Cr3 compound have been studied by means of X-Ray diffraction and magnetization measurements.The results show that the Gd2Fe14Cr3 compound has a hexagonal Th2Zn17-type structure from the temperature 294K to 692K,the Curie temperature of Gd2Fe14Cr3 compound is about 540K,the value is 30K higher as compared to the Gd2Fe17 compound. The Gd2Fe14Cr3 compound has negative thermal expansion in the temperature range 452~512K, the value is -1.6×10-5/K,and the results of magnetostrictive show that the spontaneous magnetostrictive of Gd2Fe14Cr3 compound is anisotropy, the spontaneous volume magnetostrictive deformation comes mainly from the contribution of the spontaneous linear magnetostrictive deformation along the c axis .
  • Force analysis of magnetic particles in magnetorheological fluid under wedge-like magnetic field
    ;
    . 2011, 42(S1): 45-0.
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    In this study, the finite element method is used to numerically simulate magnetic force acting on the magnetic particles in magnetorheological fluid under wedge-like magnetic field. The relation curves between flux and air gap width, magnetic field intensity and air gap width, flux and air gap angle, magnetic field intensity and air gap angle, has been given. The magnetic force acting on the magnetic particles in magnetorheological fluid has been calculated with virtual work method and Maxwell stress tensor method. Study results show that the flux, magnetic field intensity and magnetic force can be changed with air gap size: the flux, magnetic field intensity and magnetic force increase as the air gap width decrease. The flux, magnetic field intensity and magnetic force increase as the air gap angle increase, when the angle reached 0.61rad, they began to decrease. The results provide a theoretical basis for the magnetic field design to format magnetorheological fluid suspension.
  • Thickness dependence of internal stress in DLC films
    Kun-ming GU;;;;
    . 2011, 42(S1): 46-0.
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    In this paper, serials of DLC films on single crystalline Si (111) substrates with different thickness were prepared by ECR microwave plasma enhanced chemical vapor deposition method in C2H2/H2/Ar2 plasma environment. The variation of thickness with deposition time and the thickness dependence of hardness, internal stress of films were investigated. It was showed that within selected time range, the thickness changes linear with deposition time and the deposition rate could be up to 80nm/min. The internal stress in as-deposited films increased firstly with thickness. Surface cracks for stress relaxation appear when the internal stress exceeds one critical value. The XRD results showed the shift of the substrate Si (111) peak increased firstly with film thickness, and then the change trend to stable, means the internal stress will keep in a certain level after the appearance of surface cracks. However, the hardness value was affected by the surface cracks of the films
  • The Effect of Initial Microstructure on Surface Nanocrystallization of Cr-Si Alloy Steel
    . 2011, 42(S1): 47-0.
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    Nanocrystalline surface layer was fabricated on a quenched and tempered Cr-Si alloy steel by using Surface mechanical treatment. The microstructure features of various sections in the surface layer were characterized by using transmission electron microscopy (TEM). By analyzing the microstructural characteristic at different depths in the treated surface, the effect of the initial microstructures on grain refinement process of quenched and tempered steel was investigated. Experimental evidence showed the initial subgrains with small angle boundary and lower dislocation density were firstly developed into Lamellar-type dislocation cells (DCs) with dense dislocation walls (DDWs). Some initial subboundaries were moved to DDWs and annihilated by dislocation activities. The size of the DCs and subgrains formed in the interim of refinement process was not uniformity. On the top surface the cementite granules were decomposed or fragmented to hyperfine particles, and the size of the grains tended to uniformity. Experimental analysis indicated the configuration of microstructure was affect by the initial microstructure in the initial stage and the interim of the grain refinement process.
  • Effect of Micro-crystal Graphite on the Growth Rate of Type-Ⅱa Large Diamonds
    Li Shang Sheng;;;;
    . 2011, 42(S1): 48-0.
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    Type-Ⅱa large diamonds have been Synthesized under high pressure and high temperature (HPHT) which the nitrogen getter Ti(Cu) was added to FeNiCo Catalyst. The black powder was precipitated around the diamonds which grow along {111} at about 5.4GPa and 1600K. The black powder, which was precipitated on the growth of type-Ⅱa large diamonds, was characterized as micro-crystal graphite by the testing of X Ray Diffraction (XRD) and Scan Electron Microscope (SEM). With the growth-time prolonged the large diamonds were covered with the cap which was shaped by the black powder. It can be shown from the experiments that the average growth rate of type -Ⅱa large diamond was reduced from 1.15mg/h (40h) to 0.75mg/h (50h) by micro-crystal graphite. The measures were adopted to reduce the quantity of micro-crystal graphite and avoid it to affect the growth rate of large diamonds.
  • Compatibilization of Nano Cellulose whiskers/ Poly(Lactic Acid) blends with PEG
    ;;;Zhang Li Ping
    . 2011, 42(S1): 49-0.
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    The casting solution was blended with poly(lactic acid) (PLA), polyethylene glycol (PEG) and cellulose whiskers. PEG was added to the matrix as compatibilizer to improve the compatibility between the hydrophobic PLA and the hydrophilic cellulose whiskers. The composites obtained by solvent casting methods from N,N-Dimethylacetamide (DMAc) were characterized by tensile testing machine, scanning electron microscope (SEM), transmission electron microscopy (TEM) and fourier transform infrared spectroscopy (FT-IR). The tensile strength and the elongation rate at break of the composites increased by 41.2% and 38.4% respectively compared with the pure PLA. FT-IR revealed that the compatibility was improved by the addition of PEG, which was based on the existence of hydrogen bond association between PLA and nano cellulose whiskers. SEM was utilized to examine morphology and properties of the composites. The tensile fractured surface of cellulose whiskers/PLA/PEG composites showed a fibroid morphology and large scale craze. But the PLA/cellulose whiskers composites appeared less craze and brittle fracture surface. TEM showed the cellulose whiskers disperse homogeneously and form netted structure in the PLA matrix.
  • A Review on the Influence of Starch Gelatinization Water-consumption to the Water Absorbability of SAP
    ;;;
    . 2011, 42(S1): 50-0.
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    Super absorbent polymer (SAP) was synthesized by graft copolymerizing of the potato starch with acrylic acid and sodium acrylate in presence of potassium supersulphate as initiator. This article reviews on the influence of starch gelatinization water-consumption to the water absorbability of SAP. The results of the experiments show that we can obtain the products with highest water absorbability and cost-effective, when the contents of potato starch and distilled water is 1:5.
  • Review of the preparation and application of Ultra-thin alumina mask
    xin Ao ;;
    . 2011, 42(S1): 51-0.
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    Large-scale arrays of nanostructures on substrates have many potential applications in areas such as electronics, optoelectronics, sensing, catalyst, high-density storage, solar cells, field emission devices and ultra-thin display devices. Here, we review a new surface nano-patterning approach in fabricating ordered nanostructures, in which ultra-thin anodic alumina membranes are used as fabrication masks. According to the fabrication method, two different types of ultra-thin alumina masks exist: attached UTAM and connected UTAM. In this paper, applications of Ultra-thin alumina masks have been reviewed in recent years.
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