26 October 2011, Volume 42 Issue S5
    

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  • Recent Advance in Study of Polysulfonamide
    LIU Li;ZHOU Jie;GAO Ting
    . 2011, 42(S5): 781-783.
    Abstract ( ) Knowledge map Save
    Polysulfonamide is the organic high temperature material that belongs to the aromatic polyamide series. Polysulfonamide fiber is the only product in high temperature resistant fiber that Chinese owned the independent intellectual property rights. The successfully development of the polysulfonamide fiber made our country have the synthetic fiber that could resistant to 250℃. Because of the excellent physicochemical properties, the polysulfonamide obtained important application in many fields, for example, military, modern industry and environmental protection and so on. This review systematic summarizes the research status of the Polysulfonamide. It was introduced the development history of the polysulfonamide fiber in detail; homopolycondensation of the polysulfonamide spinning solution; modification methods of the polysulfonamide, include modification of the molecular structure by copolymerization and composite material with nano technology; the formation method of the polysulfonamide fiber. At the end of this review, it was pointed out the weak part of the polysulfonamide basic research, and the research direction of the polysulfonamide in the last few years.
  • Research and progress of AlInN/GaN high electron mobility transistor
    XieSheng;FENG Zhihong;LIU Bo
    . 2011, 42(S5): 784-787.
    Abstract ( ) Knowledge map Save
    Due to the merits of high temperature, high frequency operation and good anti- radiation capability, AlInN/GaN high electron mobility transistors (HEMTs) have become the hot issue for microwave power device and amplifier. Firstly, the physical properties of AlInN material and AlInN/GaN heterostructure are briefly introduced, then the epitaxial growth and device structure are analyzed. The recent progress of microwave power AlInN/GaN HEMTs is summarized in detail, and the issues for further improvement of device performance are discussed finally.
  • Magnesium alloy coated by aluminum process characteristics and application prospects
    WANG Hong;ZHANG Shiqing;ZOU Xingzheng
    . 2011, 42(S5): 788-790.
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    Abstract: Traditional magnesium and magnesium alloys exist such shortcomings of poor corrosion resistance and unsatisfactory cold processing performance. Aluminum-coated magnesium Al/Mg/Al composite plates were fabricated by clad-rolling, and then treated by diffusion annealing. Aluminum-coated magnesium composite can effectively improve the room temperature plastic and corrosion resistant performance of magnesium alloy, and significantly improve the application of magnesium alloy products and development, expand the magnesium alloy development application fields and application prospect.
    • 研究与开发
  • Magnetic and electronic transport properties of Mn2Sb0.95Bi0.05 compound
    SUN Naikun;GAO Yinbo;YANG Jian
    . 2011, 42(S5): 791-793.
    Abstract ( ) Knowledge map Save
    The Mn2Sb0.95Bi0.05 compound was successfully prepared by multi-step melting process. First the Sb0.95Bi0.05 solid solution was melted and then the solid solution was melted with Mn. The temperature dependence of magnetization curve shows the substitution of Bi for Sb can induce a first-order magnetic transition from the ferrimagneitc phase to a antiferromanetic one at 90 K. In accordance with the magnetic transition, the resistivity first linearly decreases and then increases suddenly at the magnetic transition temperature. The anomalous electronic transport behavior can be ascribed to the formation of super-zone gap.
  • Preparation of Different Micro-structural Cuprous Oxide by Solvothermal Method
    LIANG Jian;DONG Hailiang;ZHAO Junfu
    . 2011, 42(S5): 794-798.
    Abstract ( ) Knowledge map Save
    Cuprous oxide particles with a spherical diameter of about 2 to 3 microns and octahedron size of 4 microns were synthesized by a solvothermal method using copper acetate as raw materials. The effects of different reaction conditions, including temperatures, solvents, ratios of raw materials, and adding surfactant cetyltrimethylammonium bromide (CTAB), on crystal structure and morphology of micron cuprous oxide have been systematically investigated by choosing different reductants, and the optimum condition for preparing spherical and octahedral cuprous oxide has been obtained. The growth mechanism of micron cuprous oxide particles is discussed and supposed.
  • Effect of Rare Earth On The Microstructure of AgCuNi Alloys
    WANG Shuhan;LI Qiulin;LIU Wei
    . 2011, 42(S5): 799-802.
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    The effect of rare earth Y and La on the microstructure and property were investigated. It shows that the grain size is decreasing with increasing of RE content, and the shape of the grain is transform from Dendrite to Cellular.RE elements segregated in the grain boundary in the form of （AgCu）5RE. When the content of RE increased from 0.6% to 2.2%, hardness of alloy increased by 0.26 to 1.28 than AgCuNi alloy.
  • A size-controllable preparation of monodisperse mesoporous SiO2 microspheres
    ZHANG Xueling;ZHU Weiyao;CAI Qiang
    . 2011, 42(S5): 803-808.
    Abstract ( ) Knowledge map Save
    A novel size-controllable preparation method of worm-like mesoporous monodispersed SiO2 microspheres using dodecylamine (DDA) as direct agent under ethanol-water solvent system was developed by varying the proportion of reactants components. The as-prepared products were characterized with differential scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), small angle X-ray diffraction (SAXRD), nitrogen adsorption and thermal gravimetric analysis (TGA). The results showed that the SiO2 microspheres with size of 50nm~1um could be prepared by varying the molar ratio of [water]/[ethanol], when the molar ratio of dodecylamine (DDA)/tetraethyl orthosilicate (TEOS) is 0.4 and the concentration of TEOS varied from 0.138 to 0.248mol/L. This method is simple and convenient, the as-prepared silica microspheres are monodispersed and uniform, the pore size is about 1.4nm. The size controllable monodispersed silica microspheres could be used as an excellent additional medium to alter rheological behavior of fluid after surface modification.
  • Comparison of the characteristics of carbonyl iron-based magnetorheological fluid with single-sized and dual-sized particles
    GONG Zhiwei;DU Chengbin;YU Guojun
    . 2011, 42(S5): 809-812.
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    Carbonyl iron powders were produced in different sizes by using ball mill and controlling the milling time, and 8 MRFs with single-sized particles and 6 MRFs with dual-sized particles were obtained. Zero-field viscosity and shear stress were tested through rotational rheometer. Test results show that shearing stress of MRFs with dual-sized particles was enhanced comparing with MRFs with single-sized particles in the same magnetic fields. The enhanced effect was closely related to the composition of particles. Also, its zero-field viscosity and sedimentation stability had tiny differences comparing with MRFs with single-sized particles.
  • Electrical Properties of ZrO2-SiO2 Compound as MgO Power Additive
    YANG Li;WANG Shiwei;LIANG Qizhao
    . 2011, 42(S5): 813-816.
    Abstract ( ) Knowledge map Save
    In this paper, ZrO2-SiO2 compound was synthesized by sol-gel method, electric parameter tester and thermic voltage tester were used to measure the electric parameters and thermic voltage of the MgO which was added into ZrO2-SiO2 compound. The effect on electrical insulation of the added amount of ZrO2-SiO2 compound, the ratio between ZrO2 and SiO2 and annealing technics were analyzed. The results show that the leakage current will be the smallest after the annealing technique when the mass ratio between ZrO2 and SiO2 is 4:6 and the added amount of ZrO2-SiO2 compound is 2%, and it will be appropriate to be used as high temperature electrical grade MgO powder insulation additives.
  • Application of long-range surface plasmon for sensitive detection of Human E.coli
    WANG Hui;JIANG Dongmei;HUANG Xiaolin
    . 2011, 42(S5): 817-820.
    Abstract ( ) Knowledge map Save
    Abstract: A novel biosensor for sensitive detection of concentrations of human E.coli was developed. This biosensor is based on long-range surface plasmon resonance（LSPR）, using magnesium fluoride (MgF2) as a dielectric buffer layer and silver (Ag) as a sensing layer. In LSPR-based biosensor, an optimum sensor design could reduce the resonance width, resulting in higher sensitivity to the bulk refractive index changes. The multilayer structures and experimental set-up were prepared. Performance of the LSPR-based biosensor was compared to that of the conventional surface plasmon resonance (CSPR) biosensor in series of experiments. The results showed the resonance width of the LSPR-based biosensor was 1.79-fold narrower than that of the CSPR-based biosensor. In addition, the sensitivity of the LSPR-based biosensor was up to 2-fold greater than that of CSPR-based biosensor for human E.coli.
  • Effect of Sb2O3-doped on properties of Lead-free piezoelectric ceramics(Na1-xKx)0.5Bi0.5TiO3
    GUO Chenjie;ZHANG Changsong;WANG Zhen
    . 2011, 42(S5): 821-824.
    Abstract ( ) Knowledge map Save
    A new lead-free piezoelectric ceramics of (Na0.84K0.16)0.5Bi0.5TiO3 was prepared by conventional solid state reaction, The influence of Sb3+ doping on microstmcture and properties of the lead free piezoelectric ceramics was investigated. The results show that the sample density reaches maximum version 5.85g/cm3 sintered at 1160℃, all compositions are of pure perovskite structure solid state, Sb2O3 doping changes crystal cell dimension and produces Bi+3 or Na + vacancy and without impurity phase; Doping in 0.4%~0.6%, dielectric constant first increases, then decreases, dielectric loss present increasing trend; doping 0.5% Sb2O3, d33 appears maximum 142pC/N.
  • Angle distribution of damping coefficient during pulse laser ablation
    WANG Yinglong;ZHAI Xiaolin;DING Xuecheng
    . 2011, 42(S5): 825-827.
    Abstract ( ) Knowledge map Save
    The nanocrystalline silicon thin film was deposited on a half-cirque substrate using pulse laser ablation.The changes of the silicon grain size and the damping coefficient with the angle and pressure were investigated. The surface morphology and microscopes of silicon films were characterized by scanning electron microscopes (SEM), X-ray diffraction (XRD) and Raman spectrum. The results indicated that the grain average size and damping coefficients in the axial symmetric distribution relative deviation, and then decrease with increasing of the angle under certain pressure. Meanwhile, the grain size and damping coefficient increase as the pressure increases at each angle.
  • Effect of Hot Deformation Parameters on Microstructure of TA15 Alloy and phase transformation kinetics
    GAN Guoqiang;LI Ping;XUE Kemin
    . 2011, 42(S5): 828-831.
    Abstract ( ) Knowledge map Save
    High temperature compression tests of TA15 alloy were carried on Gleeble-1500 simulator, Microstructure transition of TA15 alloy under different treatments were observed by the equipment of 4XB-TV microscope and were analyzed.And the phase transformation kinetics were also dicussed with data of transformation fraction by the simulation with cellular automaton model. From the results we can see that the TA15 titanium alloy was sensitive to temperature and strain rate and the Avrami exponent n is variable ranging from 2.0 to 3.0.
  • Structure and properties of RHA/NR composite
    ZENG Zongqiang;YU Heping;LIU Hongchao
    . 2011, 42(S5): 832-834.
    Abstract ( ) Knowledge map Save
    The rice husk ash/natural rubber (RHA/NR) composites were prepared by treating RHA with rare earth and silane coupling agents. The structure, dispersion of RHA in NR matrix thermooxidative stability and mechanical properties of RHA/NR composites were analyzed using scanning electron microscope(SEM), thermogravimetry-differential thermal gravimetric analysis (TG-DTG) and mechanical measurements. The results indicate that treating RHA with coupling agents can improve the dispersions of RHA particles in NR matrix significantly, accelerate the combination between RHA particles and NR matrix and thus improve the mechanical properties and anti-oxidative behaviors of RHA/NR composite.
  • Preparation and properties study of orthodontic brackets coated with N-doped TiO2-xNx thin film
    LI Na;CAO Baocheng;WANG Yuhua
    . 2011, 42(S5): 835-838.
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  • Synthesize，Characterization and Antimicrobial Activity of Neoteric Chitosan Ester
    WANG Hedong;WANG Jiangtao
    . 2011, 42(S5): 839-844.
    Abstract ( ) Knowledge map Save
    Schiff base of chitosan（BCTS）was obtained by the reaction of chitosan and benzaldehyde，and then BCTS had the reaction with acyl chloride which was synthesized by p-aminobenzoic acid and thionyl chloride.Finally, removing the group of amino protection to get the target product. The structure of the derivatives was characterized by FT-IR, 1H NMR，13C NMR；The elemental analysis results indicated that the degrees of substitution of the products were 16.8% and 40.4%. The chitosan derivatives exhibited an better solubility than chitosan; TG and DTG results showed that thermal stability of the derivatives was lower than that of chitosan. In addition, the existence of two different amino in the molecular structure contributed to form much more –NH3+ in the acid solution which could make the derivatives have a greater advantage in the field of bacteriostasis .
  • The Preparation and Properties of Mn-Co-Ni-Pb-O NTC thermistors
    WANG Haizhen;KANG Xueya;HAN Ying
    . 2011, 42(S5): 845-847.
    Abstract ( ) Knowledge map Save
    Mn1.05-xCo0.92Ni0.03PbxO4(0.04≦x≦0.16) series NTC thermistor ceramics were studied using XRD ，SEM and electrical properties measurement，especially focusing on the variation of sintering characteristics and electrical parameters with Pb-doped amount. The results showed that the sintering temperature and the resistivity were decreasing while increasing the amount of Pb-doped. The sample with the best stability and largest contractibility was obtained when x=0.12. At the same time, the optimum sintering temperature decreased to 900~950℃. The value of ρ25 and B for the sample sintered at 950℃ were 490Ω?cm and 3969K.
  • Preparation and characterization of TiO2-Al2O3 composite photocatalyst using sol-gel method
    ZHANG Wenjie;LI Ruyuan;YANG Bo
    . 2011, 42(S5): 848-851.
    Abstract ( ) Knowledge map Save
    The TiO2-Al2O3 composite photocatalyst was prepared by a sol-gel method from a sol mixture derived from tetrabutyl titanate and aluminium isopropoxide. Methyl orange adsorption ability as well as photocatalytic oxidation of methyl orange on the composite photocatalyst under UV-light irradiation was investigated. The crystalline structure, surface morphology, composition, BET surface area and pore size distribution of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FI-IR), and N2-adsoption and desorption. The results show that the TiO2-Al2O3 composite is composed of TiO2 and Al2O3, where TiO2 is in its anatase phase and Al2O3 is in its amorphous phase. The crystalline grain growth of TiO2 is retained by the existence of Al2O3. The TiO2-Al2O3 composite photocatalyst (n(Ti)/n(Al)=12) calcinated at 500 oC for 3 h has BET surface area of 99.21 m2/g, average pore size of 22.39 nm, and total pore volume of 0.4493 cm3/g. The optimum calcination temperature for the composite is 500 oC so as to obtain the maximum photocatalytic activity and adsorption ability. As compared with pure TiO2, photocatalytic activity and adsorption ability of the TiO2-Al2O3 composite is enhanced obviously under the same conditions.
  • Effect of nano-Si02 slurry on low-k material (PI)
    HU Yi;LIU Yuling;LIU Xiaoyan
    . 2011, 42(S5): 852-854.
    Abstract ( ) Knowledge map Save
    Low-k material (PI) was spun and baked on P type <111>Si substrate .The electronic character and structure of the material were tested by the process of chemical and mechanical polishing (CMP)and dipping. In this paper ,there were two kinds of nano-Si02 slurry ,which one was traditional Cu slurry and the other was new barrier slurry .The material was characterized by scanning electron microscope (SEM) and dielectric constant tester. The results show that dielectric constant changes from 3.0 to 3.08 after polished by the traditional Cu slurry, and reaches 3.28 after polished by the new barrier slurry. Also the structure is not destroyed. As described above ,the two kinds of nano-Si02 slurry are proposed application in the ultra large scale integration.
  • Research of Relations between Microstructure and Properties of Biomass Biodegradable Materials
    WU Yu;JIA Xiujie;LI Fangyi
    . 2011, 42(S5): 855-858.
    Abstract ( ) Knowledge map Save
    A kind of biomass biodegradable foaming material which was made of plant fiber (straw fiber) and starch via foam molding process has been research. Growth mechanism of bubble hole of this material was researched, too. Microscopic structure of four different kinds of materials which has different content of plant fiber、starch and foaming agent was compared via scanning electron microscope (SEM) technology. The experimental results showed that connection form of plant fiber was overlapping stereo mesh structure. When foaming agent content was 1.0%, the size and distribution was well-distributed. Structure of bubbles was closed. This closed pore structure supported the deformation and buffer pressure of the material, and this made the material have good impact resistance, elasticity and heat insulation.
  • Study on All-optical Switching Characteristics of 3-octyl Polythiophene/Carbon Nanotubes Hybrids
    SUN Xiaofen;ZHENG Jianbang;LIAO Wei
    . 2011, 42(S5): 859-862.
    Abstract ( ) Knowledge map Save
    Single-walled carbon nanotubes (SWCNs) were dissolved in 3-octyl polythiophene (P3OTH) solution by centrifugation and successions repeatedly in this article. On that basis, the all optical switching (AOS) characteristics of P3OTH/MWNTs complex liquid (dissolvent: tetrahydrofuran) was studied by a 532nm controlling light in different power and modulation frequency. The results showed that the modulation depth (MD) of this complex liquid was 2 times deeper than P3OTH solution while modulated by the same controlling light. Maintain the light power at 7mw, the MD of the complex liquid reached a maximum, 84%, in the frequency of 25Hz; the response time was 1ms and the MD dropped to 40% while increased the frequency to 432.5Hz. Kept the frequency in 140Hz, the MD reached a maximum, 62%, by reduced the light power to 3.6mw. All the researches indicated a good AOS performance and the potential application value of the P3OTH/MWNTs hybrids.
  • Study on preparation and performance of LTCC with lower sintered
    LIANG Zhongyuan;CUI Xuemin;HE Yan
    . 2011, 42(S5): 863-865.
    Abstract ( ) Knowledge map Save
    Based on the Bi-B-Si fusible glass, we prepared the low-temperature co-fired ceramic (LTCC) powders by the way of the fusible glass + ceramic with the direct calcination method, whose sintering temperature was below 700 o C. A type of LTCC powders with dielectric constant about 9.0, low dielectric loss about 0.003 @ 500MHz was prepared by controlling the ratio of glass phase and ceramics, which can be sintered at 630 o C.
  • Influence of Mn element on the microstructure and properities of AP65 anode materials
    SHI Kai;WANG Richu;PENG Chaoqun
    . 2011, 42(S5): 866-870.
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    AP65 anode materials were prepared by melting and casting.The influence of Mn content on the electrochemical and self-corrosion behavior of AP65 anode materials were investigated by galvanostatic tests,potentiodynamic plorization and immersion tests in 3.5% NaCl.The microstructure of the experimental specimens and the corroded surface after galvanostatic test were observed by OM,SEM and XRD.The results show that the grain size are coarsened when Mn added. Mn addtion can make corrosion potential shif positivly, corrosion current density decrease, show a good corrosion resistance, and make the average of discharge electrode potential shift negativly. When Mn content is 0.3%, the anode has the most negative mean electrode potential, which up to ―1.528VSCE.
  • Study on synthesis and characterization of series functionalized ionic liquids and their physicochemical properties
    ZHU Liye;CHEN Ligong;WANG Mingqi
    . 2011, 42(S5): 871-874.
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    Series functionalized ionic liquids containing ester-group were synthesized through a typical two-step way and the products were characterized by 1H-NMR, FT-IR and elemental analysis. The results proved the reliability of the synthetic method. The basic physicochemical properties and thermal stabilities of the functionalized ionic liquids were studied thoroughly and compared with a traditional nonfunctionalized ionic liquid, 3-methy-1-butylimidazolium terafluoroborate, which had the same alkyl as the functionalized ones. We found the introduction of ester functional groups made the traditional alkyl imidazolium ionic liquids exhibit some specialities. The ester-group functionalized ionic liquids synthesized in this paper have provided new materials and laid a foundation for further study on ionic liquids.
  • Studies on Orientation of SGF/HDPE/PP Pipes Extruded by Two-Dimensional Compound Stress Field Die
    YUAN Yi;HUANG Lang;XU Shaohu
    . 2011, 42(S5): 875-877.
    Abstract ( ) Knowledge map Save
    By shearing-drawing two-dimensional compound stress field die developed by the authors, two-dimensional reinforcement short glass fiber/high density polyethylene/polypropylene (SGF/HDPE/PP) pipes were extruded. The orientation behaviors of glass fiber and polymer molecule of these pipes were studied by wide-angle X-ray diffraction (WAXD) and scanning electron microscope (SEM) in this paper. The results indicate that due to the inducement of the shearing-drawing two-dimensional compound stress field, the glass fiber of these pipes is oriented along the circular and axial directions of pipe at the same time. But the polymer molecule is oriented at a slope of 135°. Moreover, they are drawed oneselg up and deformed. So the two-dimensional properties of SGF/HDPE/PP pipes can be improved by the die at the same time.
  • Effects of Hydrazine Hydrate on Electrochemical Performance of LiNi1/3Co1/3Mn1/3O2 Cathode Materials for LIB
    WANG Dong;XIAO Xinyan
    . 2011, 42(S5): 878-880.
    Abstract ( ) Knowledge map Save
    The precursor powders Ni1/3Co1/3Mn1/3(OH)2 were synthesized by co-precipitation at first, with NaOH and NH3?H2O as chelating agent, and then LiNi1/3Co1/3Mn1/3O2 cathode material powders for lithium ion battery (LIB) were prepared from the mixture of Ni1/3Co1/3Mn1/3(OH)2 and LiOH?H2O, in which the mixture was grinded by a ball mill and then treated (pretreated at 500 ℃ for 4 h and then calcined at 900 ℃ for 12 h). The effects of hydrazine hydrate on the composition of the precursor and the electrochemical performance of LiNi1/3Co1/3Mn1/3O2 cathode materials were investigated. The morphologies of the prepared precursor were characterized by scanning electron microscopy (SEM), the structure of cathode material powders were confirmed by X-ray diffraction (XRD) and the lattice parameters were calculated, then the electrochemical performance of cathode material were tested by the charge and discharge measurement. The results showed that the cathode material shows better electrochemical property when the concentration of hydrazine hydrate were 0.48 mol?L-1, with the first specific discharge capacity 193.2 mA?h/g and 174.8 mA?h/g at 0.1C and 1C, respectively, in the potential range of 2.5 ~ 4.6 V. And the capacity of 164.6 mA?h/g was retained at the end of 30 charge discharge cycle with capacity retention of 94.16 % at the density of 1C.
  • High Performance of HTS Filter for Mobile Communication System
    MU Lijuan;WEI Bin;PIAO Yunlong
    . 2011, 42(S5): 881-883.
    Abstract ( ) Knowledge map Save
    An excellent performance of high temperature superconducting (HTS) filter for mobile communication system is present. An HTS filter which composed of twelve-pole H-type resonators was designed with a size of 38.6mm×25.8mm on a 0.518mm thickness LaAlO3 substrate, the dielectric constant is 23.75. The physical properties show the HTS film has good performance characteristics. The fabrication process adopted photolithography and ion etching. The measured results of the filter matched well with the simulated ones and show high performances better than the practical application demands. The center frequency is 830.5MHz, the bandwidth is 11MHz, the insertion loss is less than 0.2dB, the return loss is better than 15.6 dB, and the out band rejection is higher than 75 dB.
  • Preparation of Granular Activated Carbon with High-butane-working-capacity by Catalysis Activation
    ZHU Guangzhen;DENG Xianlun;LIU Xiaomin
    . 2011, 42(S5): 884-887.
    Abstract ( ) Knowledge map Save
    In some study reports on the granular activated carbon (GAC) with high butane working capacity (BWC), the preparation period was comparatively long. Adding concentrated sulfuric acid during the plasticizing stage was adopted to promote the phosphoric acid catalysis and depolymerization process of biopolymer in the China fir sawdust structure. All results showed that when 6% of concentrated sulfuric acid was added the BWC of GAC was increased from 11.9g/100ml without adding sulfuric acid to 14.4g/100ml, with an efficiency of 21%; Vmes from 0.508 cm3/g to 0.939 cm3/g, with an efficiency of 85%; SBET from 1902 m2/g to 2325 m2/g, with an efficiency of 22%; Vtot from 1.029 cm3/g to 1.685 cm3/g, with an efficiency of 64%; Vmic from 0.521 cm3/g to 0.746cm3/g, with an efficiency of 43%. Furthermore, the preparation period could be shortened from previous 20-70h to less than 5h on the basis of high butane working capacity.
  • Influence of banded structure on the parts of cracked alloy carburizing steels
    WU Min;QU Bo;LIU Hong
    . 2011, 42(S5): 892-893.
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    Abstract：The parts of cracked alloy carburizing steels were analyzed by chemical component analysis, fracture analysis, metallographic examination, and hardness testing. The result indicates that the fracture of alloy carburizing steels is fatigue fracture. The main reason of fracture is due to the existence of ribbon ferrite in the core structure.
  • Influence of heat treatment temperature on the crystal structure and electromagnetic properties of Co-plated hollow glass microspheres
    SHEN Xionggang;ZHAO Yan;ZHU Lei
    . 2011, 42(S5): 894-898.
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    Co-plated hollow glass microspheres acquired by electroless plating method were treated at different temperature, then its surface morphology, crystal structure, electromagnetic parameters, absorbing properties and the magnetic properties were studied. The results showed that with the rise of heat treatment temperature, the coatings have been through micro-melting until the more serious melting and coating spalling; HCP to FCC of Co transition occurred in the coating and the extent becomes larger. Heat treat temperature has significant influence on the permittivity of Co-plated microspheres but little influence on its permeability. The permittivity of Co-plated microspheres with 800℃ and 1000℃ rose by a large scale while the permeability changed little in 2-18GHz frequency band, thus, the reflectivity reduced dramatically. The coercive of Co-plated microspheres becomes smaller with the rise of temperature, and its hysteresis loss decreased slightly after heat treatment. It can be predicted that the absorbing properties of Co-plated microspheres with 800 ℃ and 1000 ℃ heat treatment will be greatly improved.
  • Preparation and Photoelectrochemical Properties of TiO2 Nanotube Arrays
    LIU Shikai;YANG Haibin
    . 2011, 42(S5): 899-900.
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    Abstract: TiO2 nanotube arrays were synthesized on pure Ti surfaces in aqueous phosphoric acid and ammonium fluoride solutions at 20V for 1h. The morphology and structure of the nanotube arrays were characterized by FESEM, the average tube diameter is about 100nm and the tube length is about 800nm. The photoelectrochemical properties of TiO2 nanotube arrays electrodes were considered after annealed at different temperatures and the nanotubes annealed at 600℃ were optimum. The photoelectrochemical performances were mainly investigated by I-V curves.
  • Preparation and Surface Modification of Multi?walled Carbon Nanotubes
    JIMeiru;FU Xiaoqi;DING Haihui
    . 2011, 42(S5): 901-904.
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    Carbon nanotubes (CNTs) were synthesized by chemical vapor deposition (CVD) method using the Co-MCM-41 as a catalytic template by the pyrolysis of ethanol at atmospheric pressure. The as prepared CNT were refluxed using concentrated nitric acid at 120℃ for purification and surface modification. The physicochemical properties of the obtained samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT?IR), transmission electron microscopy (TEM), N2 physical adsorption and Raman spectroscopy, respectively. The results show that the open?ended, highly purified and multi?walled carbon nanotubes with uniform diameter and thick wall were successfully synthesized. After oxidation treatment by concentrated nitric acid, some functional groups such as carboxyl and hydroxyl exist on the surface of CNTs.
  • Length effect on giant magneto impedance of melt-extracted amorphous microwires
    Zhang Shuling;SUN Jianfei;XING Dawei
    . 2011, 42(S5): 905-907.
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    The influence of microwire length on the giant magneto impedance, GMI effect and its mechanism at different frequencies are investigated in this paper. GMI effect gets worse with the length decreasing when the frequency is not higher than 1MHz due to the effect of borders on the effective magnetic field. At the given frequency of 1MHz, the maximum impedance ratio ΔZ/Z decreases from 8.07% to1.03%. However, when it is over 1MHz with the decrease of length, the reduction of resistance contributes to the higher circular permeability under the transformation of magnetization process and the skin effect. At the both sides role of border effect and the reduction of resistance, a drastic change in circular permeability occurs at an optical length. It is found that when it is about 7mm, the GMI effect of this Co-rich amorphous microwires with a diameter of 34μm is the most sensitive and the maximum ΔZ/Z is up to 86.1% at 8MHz. This result is of important in selecting sample length at different frequencies for MI sensor design.
  • Study of Performance of HIPing pure vanadium
    YE Linsen;XIAN Xiaobin;CHI Yonggang
    . 2011, 42(S5): 908-911.
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    The pure vanadium specimen was prepared by hot isostatic pressing (HIPing). The dynamic damage, welding, high temperature oxidation properties of pure vanadium were analyzed by dynamic tensile, optical microscope (OM), scanning electron microscope （SEM）, and thermogravimetric analysis (TGA). The results show that the ultimate dynamic tensile strength is 400MPa～700MPa and descends at a range of strain ratio. The leakage ratio is 1×10-9Pa?m3/s, and the grains grown unobvious, and the welding porosity decreased at range of welding depths after the pure vanadium welding. The high temperature oxidation processes follow parabolic kinetics. The activation energy for the oxidation process is 118KJ/mol. The pure vanadium is easy to form chalked corrosion on condition of high temperature.
  • Preparation and antibacterial character of polymeric quaternary ammonium salts grafted Fe3O4 nanoparticles
    WANG Jingyun;LI Ruifa;BAO Yongming
    . 2011, 42(S5): 912-915.
    Abstract ( ) Knowledge map Save
    Fe3O4 nanoparticles prepared by coprecipitation method were surface functionalized with the silane coupling agent of 3-methacryloylpropyl trimethoxysilane (MPS), then the MPS on the surface of Fe3O4 nanoparticles was copolymerized with the quaternary ammonium salt monomers (quaternization of dimethylaminoethyl methacrylate with benzyl bromide or bromohexane) by free radical polymerization, and the recyclable antibacterial polycation grafted Fe3O4 magnetic nanoparticles (pQAC-Fe3O4) were obtained. The morphology and surface composition of nanoparticles was characterized by XRD, FT-IR, DLS, TEM and TGA. It was found that pQAC-Fe3O4 nanoparticles showed a wide spectrum of excellent antibacterial activity in vitro by the colony count method. The antimicrobial activity of the magnetic pQAC-Fe3O4 nanoparticles which exhibited a response to an external magnetic field could retain 95% biocidal efficiency against E. coli after 10 cycles of repeated test. With the difference of two kinds of pQAC-Fe3O4, high antibacterial efficiency was attributed to not only the quaternary group density but also the substiuent chain of the quaternary group
  • Preparation, Microstructure and Formation Mechanism of Cu2O and Au-Cu2O Core-shell Nanocube Heterostructures
    LIU Xuehua;LI Chunyan;DIAO Feiyu
    . 2011, 42(S5): 916-919.
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    Gold nanoparticles were synthesized via a liquid phase reduction method. By adjusting the concentration of gold nanoparticles, Cu2O nanocubes and Au-Cu2O core-shell nanocube heterostructures were produced using a thermal oxidation method. Transmission electron microscopy, high-resolution transmission electron microscopy, selected-area electron diffraction and high-angle annular dark field imaging techniques were used to investigate the structure and chemical composition of gold nanoparticles, Cu2O nanocubes and Au-Cu2O core-shell nanocube heterostructures. Based on the experimental results, the formation mechanisms for Cu2O nanocubes and Au-Cu2O core-shell nanocube heterostructures were proposed. Cu2O nanocubes have two main geometrical shapes, one being a perfect cube, and the other being a truncated cube. Au-Cu2O core-shell nanocube heterostructures have two kinds of formation mechanisms: one being formed through the growth of an elliptical particle of Cu2O with the gold nanoparticle on one edge, the other being produced through the coalescence of two or more small Au-Cu2O particles. The concentration of gold nanoparticles and tetraoctylammonium bromide play an important role in the formation process of the two kinds of nanocube.
  • Column Chromatographie Separation of Nano Bacterial Cellulose
    WU Zhouxin;NIU Cheng;WANG Guizhen
    . 2011, 42(S5): 920-921.
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    In the present study, Nano bacterial cellulose (NBC) was produced with Hainan coconut juice as the raw meterial by Acetobacter xylinum HN001. Membrane separations technology was employed to wipe off macromolecule hydrogels, strains and smudge cells. Then neutral NBC were obtained using Isoionic point and Sevage removing albumen, aether removing fat, ion exchange resin eliminating celite and DEAE-32 cellulose anion exchange chromatography. Finally, The NBC with weight-average molar mass (Mw) 9598 and polydispersity index about 1.0 were obtained by Sephadex-G100 glucose gel column chromatography.
  • Effect of volume ratio of acetonitrile to water on the morphology and conductive property of polypyrrole doped with SDBS
    HUANG Zhenhao;HU Shuchun;QIU Ying
    . 2011, 42(S5): 922-926.
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    With FeCl3 as oxidant, SDBS as dopant, water and acetonitrile mixture as solvent, conductive polypyrrole (abbr. PPY) was prepared through pyrrole’s oxidation polymerization in ice bath. The as-prepared PPY products were characterized by FT-IR and X-ray diffraction, and the results showed that SDBS was doped in PPY’s molecular and the obtained PPY product was amorphous structure. On this basis, the effect of the volume ratio of acetonitrile to water (abbr. VRAW) on the morphology, yield and conductivity of PPY product was further investigated, and the results indicated that PPY’s morphology could be manipulated through changing VRAW of the reaction mixture. PPY with such morphologies as floccus, particle and flake were obtained according to its corresponding VRAW. The investigation also showed that the yield of PPY decreased with the increase of VRAW in the range of 0:10 to 6:4. On the other hand, the investigation also demonstrated that the conductivity of PPY increased with the increase of VRAW in the range of 0:10 to 2:8, and decreased with the further increase of VRAW in the scope of 2:8 to 6:4.
  • Influence of carbon nanotubes on the preparation of mesocarbon microbeads
    WANG Zhi;WANG Xu;YUChunhong
    . 2011, 42(S5): 927-930.
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    Mesocarbon microbeads (MCMB) were prepared from coal tar pitch and carbon nanotubes (CNTs). The morphologie and structure of the MCMB were investigated by SEM , laser particle size analyzer and XRD.The effect of CNTs addition on the morphologie, particle size, yield, crystallite structure of MCMB and technological parameter was investigated. The results show that adding CNTs enhances the nucleation and inhibits the growth and coalescence of MCMB，the MCMB made in the presence of CNTs tend to have smaller size and more uniform size distribution, but more CNTs can lead to poor spherical degrees and lower yields of mesocarbon. The textural layers of the MCMBs were disturbed by the CNTs and the addition of CNTs decreased the graphitization degree of the MCMB. Compared with the raw CNTs, the CNTs treated with blended acid can achieve better sphere and more uniform MCMBs with increasing CNTs ratio.
  • Influences of Sintering Temperature on Structure and Properties of Cu-Doped Lead-Free LNKN Ceramics
    LI Haitao;ZHANG Boping;WEN Jiuba
    . 2011, 42(S5): 931-934.
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    Lead-free piezoelectric ceramics Li0.06(Na0.5K0.5)0.94NbO3+0.8mol%CuO (LNKN-Cu0.8) were synthesized by a traditional solid-phase sintering. The crystalline phase, microstructure and electrical properties of the ceramics were investigated with a special emphasis on the influence of sintering temperature. The density possesses a peak with increasing sintering temperature and reaches its peak value of 95% at 1020 oC. The X-ray diffraction analysis indicates that all ceramics possess a single perovskite structure without any other secondary phases over the whole sintering temperature range. Although MPB separating the orthorhombic and tetragonal symmetries was absent, the maximum piezoelectric coefficient (d33) of 196 pC/N was obtained at 1020 oC owing to the combined action of density and fine microstructure.
  • Study on Characteristics of Linear Temperature-sensitiveComponent with type Resistance- capacitance
    TANG Guangming;LUO Weifan;LUO Wenbo
    . 2011, 42(S5): 935-937.
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    Abstract: A new type of linear temperature-sensitive components was discussed in this paper. The device has two temperature characteristics of electric resistance and dielectric capacitance with many advantages such as large monitoring space range, high reliability, simple and clear system of secondary instrument circuit and so on.
  • Research of the impedance hydrogen sensors for SnO2 as the sensing material
    ZHAO Bingjian;WANG Ling;HE Cheng
    . 2011, 42(S5): 938-941.
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    The sensing material SnO2 was made in the framework of the solid electrolyte Ce0.9Gd0.1O1.95（CGO） by using the infiltrating way, and hydrogen sensors were fabricated. The morphology and phase composition of hydrogen sensors were observed by XRD and SEM. The gas sensing properties of the sensors were measured by IM6e electrochemical workstation. The results showed that the particle size of sensing material SnO2 was about 400nm. The impedances of sensors obviously were decreasing with increasing H2 concentrations at 400℃~550℃. The sensors response and H2 concentrations showed good linear relationship. The response signal rate of sensors was gradually promoting with increasing temperatures. At 550℃, 90% response time of sensors signal was about 170s with H2 concentrations at 1000ppm.
  • Synthesis and Characterization of PEG-IPDI-DMPA Block Ionomers and their Solution Behavior in Water Phase
    HU Jianqing;ZHU Haijun;TU Weiping
    . 2011, 42(S5): 942-946.
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    PEG-IPDI-DMPA block ionomers were synthesized by solution polymerization, and their structure was characterized by FTIR, 1H-NMR, GPC and DSC; their solution behavior in water phase was studied by particle size, reduced viscosity, rotational viscosity and conductivity. FTIR confirmed that block ionomers with polyurethane structure expected were synthesized; DSC proved that the molecular chain of block ionomers was block copolymers which were composed of two phases--hard segment and soft segment; under TEM, block ionomers showed a relatively regular spherical particles status in water solution. Particle sizes of all PEG-IPDI-DMPA block ionomers were about 200 nm; most of their reduced viscosity was in 1 min; PEG-IPDI-DMPA block ionomers were thinner after shearing.
  • High-temperature Oxidation Process of MCrAlY Coating deposited by Plasma Spraying
    LIU Wenkai;LIN Xiaoping;LU Xuecheng
    . 2011, 42(S5): 947-949.
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    The high-temperature oxidation process of MCrAlY（M=Ni，Co）coatings by plasma spraying have been studied under 1100 ℃. The experimental results show that the oxidation kinetic curves of MCrAlY（M=Ni，Co）coatings by plasma spraying under 1100 ℃ obeyed the parabolic law , and the oxidation rate constant kp = 1. 401 ×10-6 mg-2?cm-4?s -1. Oxidation process can be thought three step: First stage, the oxidation rate was very fast, and main oxidate wasθ-Al2O3; With time expanding , θ-Al2O3 changed into α-Al2O3 and the uninterrupted α-Al2O3 film formed, then, the oxidation rate become stable; The oxidate become comples when the phenomenon of poor Al appeared, even the element whit stable property-Ni have been oxidized into NiO.
  • Research of LiFePO4 with two carbon doping steps for cathode material of lithium-ion battery
    TANG Yingcai;XUE Weidong
    . 2011, 42(S5): 950-952.
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    A synthetic method of LiFePO4/C composite used as the cathode material in lithium ion battery was presented in this paper by two carbon doping steps. The experimental results verified that the C-doping at different stages has no effect on crystal form of LiFePO4/C composite and clear effect on electrochemical performances. The carbon doping by two steps can enhance the capacity and improve the stability of cathode material obviously. As the 3wt% carbon doped in lithium iron phosphate by inducing saccharose, the powders with smaller size were prepared successfully and the sample possessed excellent electrochemical performs. The initiate capacity and specific capacity after 20 cycles of LiFePO4/0.2C composite were 161.19mAh/g and 153.68mAh/g respectively.
  • Study on the preparation, characterization and performance of NASICON-type Na+ exchange Materials
    ZHU Chaoliang;DENG Xiaochuan;XIA Jiping
    . 2011, 42(S5): 953-956.
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    Two series of NASICON-type functional materials of Li1.4M0.4Ti1.6 (PO4) 3 (M = Al, Cr) were prepared by two-step high temperature solid-phase reaction. The doped samples were characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM), and the Na+ adsorption capacity were mensurated respectively. The results showed that proper concentration doping of Al3+and Cr3+ did not change the crystal structure of the LiTi2(PO4)3. The particle size of synthesized adsorbent distribute in 5 to 10μm. Li1.4M0.4Ti1.6 (PO4) 3 (M = Al, Cr) have special effects on the adsorption of Na+, when PH value is 11, the saturated adsorption capacity of Li1.4Al0.2Cr0.2Ti1.6 (PO4) 3 can be up to 69.26 mg/g.
  • TiO2 nanotube arrays semiconductor character and photoelectrocatalytic dynamics
    ZHANG Shenghan;LIANG Kexin;TAN Yu
    . 2011, 42(S5): 957-960.
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    TiO2 nanotube arrays were prepared by anode oxidation in organic electrolytes. There were different morphologies by the different oxidation time. Their photoelectrochemical activities were examined with different bias applied on the Ti/TiO2 electrode by photo current response. The highest photo current was indicated by the regular nanotube of 6h oxidation at the bias E=0.1V. The characteristic parameters for TiO2 nanotube arrays such as carrier density, flat potential, width of space charge layer and badgap bending were calculated by Mott-Schottky curve and the growth mechanism of TiO2 nanotube arrays was suggested: TiO2 nanotube arrays were prepared under the combined effect of oxidation reaction and dissolution reaction. The detailed dynamics information of TiO2 nanotube arrays electrode at the semiconductor/electrolyte interface were obtained by equivalent electrical circuit fitting to EIS spectra. The photoelectrocatalytic rate was highest at the bias potential of 0.1V. The extra bias potential can decrease the electron-transfer resistance and increase the separation efficiency of photogenerated electron-hole pairs. The redox reaction in Helmholtz layer was the rate limiting step for the photoelectron- catalytic process of ammonia degradation.
  • Study on the Preparation and Properties of NiCr2O4/TiO2 Thin Film Photoanode
    HU Zhiqiang;LIU Xianqing;HUANG Defeng
    . 2011, 42(S5): 961-963.
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    Abstract: NiCr2O4/TiO2 thin film photoanode were prepared by doping spinel–type NiCr2O4 nanocrystalline prepared by the citrate method into P25 (degussa, TiO2), and then assembled into Dye–sensitized solar cells (DSSC) and characterized the photoelectric properties. The study showed that the NiCr2O4/TiO2 induced interface potential and the diffuseness of NiCr2O4 formed electric potential distribution, which promoted photogenerated electrons and electron hole transfered in an opposite direction. When the doping amount of NiCr2O4 was 1wt% ,compared to the pure TiO2 thin film photoanode, the cell incident monochromatic photo–to–current conversion efficiency（IPCE）and photoelectric conversion efficiency (η) increased by 13%, 30.8% , respectively.
  • Effects of Cr-Cu plating on thermal conductivity of diamond-Cu composites
    XU Liang;QU Xuanhui;LIU Yibo
    . 2011, 42(S5): 964-966.
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  • Study on High Pressure and Heat-Treatment of β-FeSi2 synthesized
    ZHENG Youjin;MA Hongan;JIA Xiaopeng
    . 2011, 42(S5): 967-969.
    Abstract ( ) Knowledge map Save
    β-FeSi2 was prepared successfully by high pressure technique combining with heat treatment method. The effect between phase change of Fe-Si alloy and heat treatment time was charactered by x-ray diffraction. The micro structure was investigated by electronic scanning electron microscopy (SEM). The measurement results show that: the Fe-Si alloys with the main phases ofα-FeSi2、ε-FeSi could be synthesized by high pressure and high temperature (HPHT) pressure. Combining with long time heat treatment could helpful to form β-FeSi2 alloys.
  • Fabrication and Performance of Sulfur Tolerant IT-SOFC Based on VOx-Cu impregnated YSZ Composite Anode Support
    LUO Kun;TU Hengyong;FU Xianzhu
    . 2011, 42(S5): 970-973.
    Abstract ( ) Knowledge map Save
    In this work, YSZ green tape was prepared by tape-casting technique, 10Sc1CeSZ electrolyte was deposited on it by screen printing. The bilayer of porous YSZ substrate supported dense 10Sc1CeSZ electrolyte thin film was successfully obtained after the co-sintering process. Then, CGO and LSC films were deposited on the surface of the 10Sc1CeSZ successively by screen printing method. V2O5-CuO-YSZ composite anodes were acquired by impregnation. Microstructures analysis of bilayer before and after impregnation by SEM showed that the electrolyte was very dense, the holes in porous YSZ were connected and the catalyst uniformly distributed in the holes. At 800 °C, using humidified pure H2 and syngas（40%H2, 60%CO）containing 5200ppmv H2S as fuels, the open cell voltage (OCV) were 1.08 V and 1.07 V, respectively, and the maximum power densities were nearly same with the value of 37 mW/cm2. The testing results demonstrated that the cells with the impregnated VOx-Cu had stable performance fed by H2S containing-syngas.
  • Reaction process researchof CeNi5by Electro-Deoxidation in a Eutectic CaCl2-NaCl Melt
    MENG Weiwei;YAN Beilei;SUN Zhaohui
    . 2011, 42(S5): 974-976.
    Abstract ( ) Knowledge map Save
    Abstract：This paper is to study the reaction mechanism of CeNi5 by the sintering experiments of a mixture of NiO and CeO2 Electrolysis CeNi5.It is showed that the mixture demi-body of high-valence oxide NiO and CeO2 dissociated oxygen ions in high temperature molten salt, formate the low-valence oxide CeOCl by XRD and SEM. intermediate product further generate oxygen elemental and alloyed metals.
  • Effect of LaH3 Addition and Milling Time on Hydrolysis Beha-viors of Mg17Al12 Hydride, Effect of LaH3 Addition and Milling Time on Hydrolysis Beha-viors of Mg17Al12 Hydride
    WU Haiwen;WU Chaoling;CHEN Yungui
    . 2011, 42(S5): 977-980.
    Abstract ( ) Knowledge map Save
    Mg17Al12 is a brittle intermetallic compound, which can be easily pulverized and hydrogenated, and the hydrogenated Mg17Al12 (MHA in brief)can be used as the raw materials for hydrolysis. However, pure MHA has a lower hydrogen yield, which needs to be improved. In this paper, the hydrogen yield of MHA with LaH3 added was investigated. Subsequently, the effect of ball milling time on hydrogen generation by hydrolysis of the mixture was also discussed. The results showed that the conversion yield declines as ball milling time increases. When the mole ratio of Mg17Al12 hydride to Mg-La hydride which contains LaH3, is 2:1, the hydrogen yield of the mixture, which was milled for 0.5h before hydrolysis, reaches 90.9% at 70℃ in 1.5h., Mg17Al12 is a brittle intermetallic compound, which can be easily pulverized and hydrogenated, and the hydrogenated Mg17Al12 (MHA in brief)can be used as the raw materials for hydrolysis. However, pure MHA has a lower hydrogen yield, which needs to be improved. In this paper, the hydrogen yield of MHA with LaH3 added was investigated. Subsequently, the effect of ball milling time on hydrogen generation by hydrolysis of the mixture was also discussed. The results showed that the conversion yield declines as ball milling time increases. When the mole ratio of Mg17Al12 hydride to Mg-La hydride which contains LaH3, is 2:1, the hydrogen yield of the mixture, which was milled for 0.5h before hydrolysis, reaches 90.9% at 70℃ in 1.5h.
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