15 February 2012, Volume 43 Issue 03
    

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  • Preparation and Properties of Silicon Carbide Fibers with Non-circular Section
    Yang Li;Jia-Cheng Gao
    . 2012, 43(03): 273-277.
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    Non-circular SiC fibers with special electromagnetic properties had been received extensive attention by researchers. The preparation methods progress in C-shaped,hollow-shaped,trilobal,ribbon and cross section SiC fibers are reviewed from melting spinning and chemical forming . Some.non-circular SiC fibers’ properties are overrvered. The existing problems, the development of follow-up are also discussed in this paper.
  • Application of polyethylene oxide and its derivatives in hydrophilic modification of ultrafiltration membranes
    Liang Zhang;Guo-Liang Zhang
    . 2012, 43(03): 278-281.
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    This paper concerns the polyethylene oxide and its derivatives used in the hydrophilic modification of hydrophobic ultrafiltration membranes. The related modification methods and technologies mainly including coating, blending, surface grafting and the modification of membrane material are discussed and analyzed in detail. After the modification using polyethylene oxide or its derivatives, the contact angle of different ultrafiltration membranes reduced and the adsorption of protein on the surface of membrane decreased. All of the modified ultrafiltration membranes demonstrate the good performance on hydrophilicity and the resistance of fouling and have a promising future in application.
    • 研究与开发
  • Preparation of Ultra-fine Nickel by Electrochemical Milling Method
    Cai-Cui Li;Da-Wei Zhang;Jing-Juan Chen
    . 2012, 43(03): 282-286.
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    Ultra-fine nickel powders were prepared by electrochemical reduction of NiO powder using lithium-ion battery as a micro-reactor. X-ray measurement shows that the synthesized powder consists of pure nickel phase with grain size of about 5nm. Laser particle size determination shows the nickel powder has a narrow particle size distribution with D50 in the range of 200-600nm.Transmission electron microscopy shows the nickel powder is 80-200nm.The particle size increases when increasing the discharge current density and discharge temperature. The dispersion performance of nickel can be optimized by surfactants.
  • Equations of state for a new type polyester material
    Guang-Fa Gao;Yong-Chi Li;Zhi-Hai Wang
    . 2012, 43(03): 287-289.
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    Polyester material is widely used in aerospace field, and its high pressure mechanical properties become the study hot spot in recent years. Aimed at a new type polyester material, its impact compression behaviors were investigated by means of Light Gas Gun (LGG). The shock wave velocity (D) and the particle velocity (u) behind the shock wave were measured and calculated by using Asymmetry Impact and Direct Measurement. Based on the experimental results and calculated results, the D-u type Hugoniot curve and P-η type Hugoniot curve were obtained. The Murnagham equation of state for polyester material and its coefficients were obtained on the basis of its Hugoniot curve. Then, based on the experimental data, two kinds of equations of state were compared and discussed.
  • Transparent Sodium Potassium Niobate Ceramics Sintered in Atmosphere
    Dong-Liang Shi
    . 2012, 43(03): 290-293.
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    Abstract：Using the lithium carbonate and bismuth oxide as additives for restricting the grain growth, the transparent potassium sodium niobate (K0.48-0.5xNa0.52-0.5xLixNb1-xBixO3, x=0.04-0.15) ceramics were sintered in atmosphere. The effect of additive content and sintering conditions on the transparency, electric-optic coefficient, crystalline structure and micro-morphology were investigated. The electro-optical coefficient of the KNN (x = 0.09) ceramics with thickness of 0.5mm was found to be 6.06×1011 m/V.
  • Preparation and photocatalytic property of Ni-doped TiO2 photocatalyst
    Gang Dong;Zhong-Qi Zhu;Qing-Ju Liu
    . 2012, 43(03): 294-298.
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    Abstract: The TiO2 photocatalyst samples doped with nickel were prepared by sol-gel method. The samples were analyzed by XRD,XPS, FT–IR, UV–Vis, PL et al. The photocatalytic activity of the samples doped with different nickel content and sintered at different temperature were investigated by measuring the methyl blue （MB）degradation rate under the fluorescent lamp irradiation. The results show that Ni-TiO2 samples are a mixed phase of anatase and rutile and the threshold wavelength is red shift about 55nm. The nickel doping inhibits the growth of crystallite size and transformations of crystallite phase from anatase to rutile and the photocatalytic activity is improved. The activity of the sample prepared at 500℃, n (Ni）: m（TiO2）=1: 100 is the best under fluorescent lamp and is obviously highter than that of Degussa P25.
  • Fabrication of Three-dimensional ordered macroporous SiO2 by Air-water interface binary self-assembly
    Chang-Ping Song;Jun-Kang Liu;Shi-Rong Liu
    . 2012, 43(03): 299-302.
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    Abstract：Monodisperse polystyrene microspheres with the size of 229nm were synthesized by emulsion polymerization technique. We have fabricated Three- dimensional ordered macroporous silica with silica sol and PS microspheres by using solvent evaporation method. Scanning Electron Micrographs(SEM) showed that when the silica volume fraction was 11 percent the best ordered 3DOM Silica macroporous material was fabricated. It had regular close-packed face-centered cubic(fcc) structure.The diameter of macroporores was 219 nm corresponding to a shrinkage of 4.3%. The walls of pores contained the mesoporous structure with a narrow pore size distribution in 6.4nm according to the result of N2 adsorption-desorption.
  • The Kinetics on open-circuit reduction of Cr(VI) by polypyrrole-modified film
    Ying Tian;Ming Liu;Cheng-Bing Wu
    . 2012, 43(03): 303-304.
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    Polypyole (ppy) films were electropolymerized from a para-toluenesulfonic sodium solution on stainless steel (SS). The reduction of Cr(VI) by ppy-modified electrode at open-circuit mode was studied. The ability of oxidative ppy and reductive ppy on Cr(VI) removal was compared. It is found that the oxidative ppy could remove Cr(VI) effectively by adsorption process. However, reductive ppy displays higher removal efficiency than oxidative ppy. The kinetics of open-circuit reduction on Cr(VI) by ppy-modified film was proposed.
  • Study on Nb and Si addition to improve antioxidation abilityin nanocrystalline alloy
    Guang-Min Li;Zhi-Chao Lu;De-Ren Li
    . 2012, 43(03): 305-308.
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    The crystallization and oxidation are analysed by SEM and XRD methods after Fe82Cu1B12Si4Nb1 and Fe73.5Cu1B7Si15.5Nb3 glass alloys burning in air for 3s at 600℃. Fe82Cu1B12Si4Nb1 alloy has high saturation influx density and low coercivity, but the amorphous forming ability and antioxidant ability are weakened with decreasing Nb and Si concentration and increasing Fe and B concentration. The crystallization model is put forward on the basis of elements distribution of K. Hono’ observation. The crystallization temperature of residual amorphous phase is improved with Nb element congregation in it by analysis of crystallization model. The residual amorphous phase with high Nb content can enhance antioxidant ability and restrain the growth of grains.
  • Effects of nano-SiO2 on morphology and thermal energy storage of electrospun LA-PA/PET composite phase change fibers
    Hui-Zhen Ke;Yi-Bing Cai;Qu-Fu Wei;Hui Qiao
    . 2012, 43(03): 309-312.
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    The form-stable phase change composite fibers consisting of binary LA-PA eutectic, polyethylene terephthalate (PET), and silica nanoparticles (nano-SiO2)? were successfully fabricated by the technique of electrospunning. The effects of nano-SiO2 on morphology and thermal energy storage properties of electrospun LA-PA/PET/SiO2 phase change composite fibers were investigated by SEM and DSC. The SEM images showed that the electrospun LA-PA/PET/SiO2 ultrafine composite fibers possessed the smooth surfaces morphologies with fiber diameters slightly smaller than those of the LA-PA/PET fibers with wrinkled surfaces; the average diameters of the ultrafine composite fibers gradual increased with increasing content of the nano-SiO2 in the composite fibers. The DSC results indicated that the content of nano-SiO2 in the fibers plays an important role on the enthalpies values of melting and crystallization of the composite phase change fibers, while it had no significant effect on the temperatures of phase transitions.
  • Investigation into the tribological properties of a-C:H Film under different vacuum degree
    Yan-Xia Wu;Hong-Xuan Li;Li Ji
    . 2012, 43(03): 313-316.
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    The a-C:H film was deposited by unbalanced magnetron sputtering on stainless steel and silicon p(111). The fabricated a-C:H film is homogeneously and has a high hardness, low internal stress and a good adhesion with the substrate. The tribological properties of the films under different vacuum degree（1.0×105 Pa 、5.0×10-2 Pa 、1.0×10-2 Pa 、5.0×10-3 Pa ）were tested on a ball-on-disk machine. The results show that the friction coefficient of the film is decreasing but the wear rate is increasing with the increase of vacuum degree. The tribological properties of the films change dramatically under 5.0×10-3 Pa，which has the lowest friction coefficient of 0.005 and an extremely short lifetime. The lifetime in high vacuum is related to the dehydrogenation and the structural transformation of the film.
  • Preparation and characterization of a new polylactide-b-polyimide copolymer
    Shu-Hua Dou;Jiao-Xia Sun;Chang-Sun Ruan
    . 2012, 43(03): 317-319.
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    A new soluble polyimide was prepared by amino-terminated PEG-800 and Pyromellitic dianhydride,then the amino-terminated polyimide induced ring-opening polymerization of lactide with the catalysis of stannous octanoate(Sn(Oct)2) to obtain polylactide-b-polyimide copolymer(PLA-PI-PLA).The structure of the obtained polymers was characterized by infrared spectrum(IR), 1H nuclear magnetic resonance spectrum (1H-NMR),Gel permeation chromatography(GPC) and water contact angle.The results of FTIR,1H-NMR and GPC showed that PI and PLA-PI-PLA were successfully synthesized. Water contact angle showed that PLA-PI-PLA can improve the hydrophilicity of PLA.Meantime,the imide rings of PI could provide reactive sites to further modify the property of PLA.
  • Study on capacitive deionization of carbon aerogel by electrosorption
    Ling Liu;Qing-Han Meng
    . 2012, 43(03): 320-323.
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    In this paper, carbon aerogel was synthesized by sol-gel reaction through supercritical evaporation and carbonization and so on, using resorcinol and formaldehyde as raw materials. The microscopic structure was characterized by SEM and N2 sorption and desorption. The effect of applied voltage and NaCl solution concentration on performance of electrosorption was studied The results showed that carbon aerogel electrode has high electrosorption efficiency, and sorption balance was achieved within 20 minutes. With applied voltage and NaCl solution concentration increasing, electrosorption time decreased, moreover electrosorption capacity and current increased.
  • Structural and magnetic properties of LaFe11.44Si1.56 compound synthesized by vibratory milling
    Li-Gang Wang;Gu-Si Te;Zhi-Ming Shi
    . 2012, 43(03): 324-325.
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    In this experiment, the LaFe11.44Si1.56 compound was synthesized by vibratory milling and short heat treatment. The results show that the ball-milled powders form in the NaZn13-type cubic crystal structure by a heat treatment at 1100℃ for 30min. The Curie temperature, 210K, of the compound synthesized by vibratory milling increases 15K compared with the Curie temperature, 195K, of the compound prepared by arc-melting, and the maximal magnetic entropy change decreases. Therefore, it is worth to further study and develop the vibratory-milling synthesizing of La(Fe, Si)13 compound.
  • Microstructure of Al2O3/7055Al in-Situ Composites Synthesized by Magnetochemistry
    Shuai Chen;Yu-Tao Zhao;Gui-Rong Li
    . 2012, 43(03): 326-330.
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    Microstructure of Al2O3/7055Al in-Situ Composites Synthesized by Magnetochemistry CHEN Shuai，ZHAO Yutao*，LI Guirong, JIN Hua,Donghua Xuan , CHEN Gang （School of Material Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, PR China） Abstract : Under pulsed magnetic field, 7055 aluminum matrix composites reinforced by in-situ Al2O3 particles have been fabricated successfully from 7055Al-Ce2(CO3)3 system. The results indicate that in-situ particles synthesized under pulsed magnetic field are finer and uniformly dispersed in the aluminum matrix. The range of round and Al2O3 particles size is 200-400nm. Compared with traditional in-situ reaction, the in situ reaction under pulsed magnetic field is faster and more complete, and shorten time considering the reactive kinetics. With the increasing of the plused magnetic intensity and applying time, the size and distribution of in-situ particles in the matrix become finer and more homogenous, the size is up to nanomete .
  • Study on preparation of high thermal conductive adhesive for mica tape
    Li-Zhu Liu
    . 2012, 43(03): 331-333.
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    In this issue, Tong Ma anhydride-epoxy adhesive for mica tape were selected，which was filled with certain inorganic powder to increase the thermal conductivity. During initial experiment exploit, technological factors which influenced on thermal conductivity of adhesive were analyzed. Through thermal conductivity test, surface modification of inorganic fillers was identified, and the optimal filler dispersion process was concluded, which involved the adding method, dispersion method, and mixing paremeters.
  • Effects of B on Microstructure and Shielding Properties of Pb-Mg-Al-B Shielding Functional Materials
    Yong-Huan Duan;Yong Sun;Zhong-Zheng Guo
    . 2012, 43(03): 334-337.
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    The cast Pb-Mg-Al-B shielding materials were prepared by using of vertical high-frequency induction furnace, and their microstructures, mechanical and shielding properties were investigated. The results showed that the AlB2 particles in the alloys increased with the addition of B. The room temperature tensile strength and Brinell hardness were up to 105 MPa and160, respectively. The shielding rates of Pb-Mg-Al-2%B (mass percentage) shielding materials in thickness of 20 mm were 90.29%, 99.22% and 97.9% for X-ray with energies of 250KeV, 118KeV and 65KeV; 49.75% (137Cs source) and 34.21% (60Co source) for γ-ray; and 92.7% for neutron. It indicated that the shielding material possessed higher strength, excellent X (γ) ray and neutron shielding properties, and had the features of the integration of structure - function (shield).
  • The preparation and electrical properties of barium strontium titanate/silicon nanoporous pillar array composite thin films
    Shun-Hua Xiao;Ren-Heng Wang;Yin Bao
    . 2012, 43(03): 338-341.
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  • Preparation and Characterization of Eggplant StalkActivated Carbon by Zinc Chloride
    Cheng-Yu Ma;Hui-Zhen Xiong;Xin-Shan Song
    . 2012, 43(03): 342-345.
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    The activated carbon was prepared from eggplant stalk by activation of Zinc Chloride. The optimum conditions were obtained by using the orthogonal experiment method. Porosity characteristics were determined from the analysis of N2 adsorption isotherms using both BET and Langmuir equations as well BJH method. The surface functional groups were analyzed by using a FT-IR spectroscopy. Microstructure of the sample was examined using a scanning electron microscopy (SEM). The results show that the best sample of activated carbon is obtained under the conditions :the impregnation ratio of 2; impregnation time of 8 hour; activation temperature of 550 ℃ and activation time of 60 min.The iodine adsorption value and methylene blue adsorption value of the prepared activated carbon are 1270.06 mg.g-1 and 17.4 ml.g-1,respectively. And the activated carbon developed possesses a large apparent surface area (SBET=1649.615 m2.g-1,SL=1851.649 m2.g-1) and high adsorption pore volume (V=0.488 cm3.g-1) with average pore size diameter of 2.241nm.
  • Preparation and Growth Mechanism of Dendritic α-Fe2O3
    Li Guo;Yu Cao;Xin Xin
    . 2012, 43(03): 346-348.
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    The dendrite α-Fe2O3 has been synthesized using K4[Fe(CN)6]、polyethylene glycol (PEG400) and H2O2 as raw materials by hydrothermal method. The morphology and microstructure of the product have been characterized by XRD, SEM, TEM, HRTEM, SAED, and Raman. It has been revealed that the main trunk of α-Fe2O3 grows along [101(-)0] while the branches grow along [11(-)00] and [011(-)0]. Furthermore, the growth process and formation mechanism of the products have been discussed.
  • Preparation of monodisperse polystyrene microspheres and analysis of Surface morphology of its masks
    Jing-Yu Mao;Sha-Sha Zhao;Jian Lin
    . 2012, 43(03): 349-352.
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    Dispersion polymerization of styrene was carried out in water medium in the presence of acrylic acid using ammonium persulfate as initiator. The effects of reaction temperature, time, acrylic acid concentration, PH value and initiator concentration on the size and its distribution of polymer particles were investigated, from which an ideal recipe was found out too. There are two types of stacking existed in the surface of PS masks, the one stacked along the ?111? direction for the FCC structure while the other one stacked along the ?100? direction.
  • Effect of the Porous Silicon On the Minority Carrier Lifetime of Monocrystalline Silicon
    Jia-Yan Li;Su-Xia Guo
    . 2012, 43(03): 353-356.
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    P-type monocrystalline silicon (mc-Si) was used as the starting material. Porous silicon (PS) layer was formed on the front surface of (mc-Si) silicon by chemical etching. We obtained the different porous silicon layers in the case of the different etching time, which was characterized by SEM, and tested the minority carrier lifetime by WT-2000 μ-PCD. It was found that compared with the other samples, the surface morphology of porous silicon was best under the condition of etching 11min in the same solution ratio, as well as the porosity was largest. We noticed a significant improvement for the minority carrier lifetime at 850℃ for 150min. The improvement level of the minority carrier lifetime was different for the etching time. The sample of etching 11min was more efficient than other samples, up to 10%. It is well known that the porous silicon layer formation was accompanied by the appearance of elastic mechanical stress, which caused the elastic deformation in porous silicon/silicon interface. These interfaces were the favorable sites for defects and metallic impurities. In addition, PS had a crystalline structure like silicon substrate, but its crystal lattice parameters in surface direction exceeded them of initial crystalline silicon, which was beneficial to the migration for metallic impurities from the bulk to the PS layer.
  • Study of gradient-index broadband antireflection PV glass
    Li-Qiang Liu;Shu-Ping Zhang;Guo-Ying Zhang
    . 2012, 43(03): 357-359.
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    This paper prepared a gradient-index antireflection PV glass with two-step etching method. SEM analysis shows that microstructure size of antireflection layer is 20-30nm and layer thickness is 100-300nm. Gaussian-like index profile of antireflection layer was affirmed by calculated simulation. The bandwidth of the transmittance more than 96% of the gradient-index broadband antireflection PV glass exceeds 1200nm. The transmittance in the band of 390-1022nm is more than 99% while the double-faced reflection in the band of 350-1084nm is less than 1%. Especially, the double-faced reflection in the band of 624-922nm is less than 0.2%.
  • Dynamic Mechanical Properties Testing for Compression Mode of Magnetorheological Elastomer
    Ben-Xiang Ju;Miao Yu;Jie Fu
    . 2012, 43(03): 360-362.
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    Magnetorheological elastomers (MRE) is a kind of novel magnetorheological material and have successful application in variable stiffness devices. In the process of studying MRE material, the establishment of dynamic mechanical properties testing system is the problem must to be solved. In this paper, dynamic compression mode testing system based on electromagnetic vibration system was designed. Linear frequency sweep was executed by electromagnetic vibration system under different magnetic flux density, Laser displacement sensor installed on the testing system to get Incentives and the corresponding signal of testing system. Therefore, stiffness and damping properties under compression were obtained through establishing mechanical model of the system and processing for signal of sensors. The system will provide a necessary evaluation system under compression mode for preparation high performance MRE.
  • Study on Photoluminescence property for CaO-B2O3-SiO2 Glass Doped with Sm2O3
    Yin-Po Zhu;Zhen-Feng Zhu;Si-Jia Hua
    . 2012, 43(03): 363-366.
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    A series of luminescent glass composed of CaO-B2O3-SiO2 (CBS) doped with samarium oxide (Sm2O3) were prepared and the spectroscopic properties of the samples were investigated by photoluminescence (PL) measurement. The UV-Vis adsorption spectrum of CBS-S glass indicate the good absorption and transparence within visible light region. The PL spectrums of CBS-S glass show the characteristic emission assigned to Sm3+ under 404 nm excitation. Furthermore, the intensity of emission for Sm3+ at 602.8 nm varies according to the increasing of Sm2O3 molar ratios and the quenching concentration is eatimated to be 0.10 mol %. Furthermore, the CBS-S glass can be applied to the emitting LED devices for their ultraviolet light to red-orange light transformation.
  • The Technological Conditions of Preparation of Mesophase Pitch by Simultaneous Hydrogenation-thermal Condensation
    Wen-Li Xia
    . 2012, 43(03): 367-370.
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    In this work, the spinnable mesophase pitch was prepared through simultaneous hydrogenation-thermal condensation of coal tar pitch with tetralin as hydrogenation agent. The influences of reaction temperature and soaking time on the properties of mesophase pitch were systematically investigated. Results showed that with the reaction temperature increasing, the softening point and insoluble content of mesophase pitch were increased; the MP prepared at lower temperature is the mixture of isotropic pitch and mesophase spheres and at higher temperature is the pitch with anisotropic pitch as continuous phase. Furthermore, fixing the reaction temperature(410℃), with the reaction time increasing, softening point and insoluble content of mesophase pitch were improved remarkably. Accordingly, the mesophase texture was experienced from mesophase sphere to mosaic texture. The test of spinning property showed that the mesophase pitch prepared in 410℃ and 420℃ for 4h could be melt spun into fibers, which was made into carbon fibers through melt spun, oxidation and carbonization.
  • Preparation and characterization of functionally gradient material of poly (vinyl alcohol)/ nano-hydroxyapatite/polyamide66 for repair of articular cartilage and underlying bone
    Xiao-Bing Luo;Li Zhang;Ming-Bing Zhou
    . 2012, 43(03): 371-374.
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    The functionally gradient material of poly (vinyl alcohol)/ nano-hydroxyapatite/polyamide66 for repair of articular cartilage and underlying bone was prepared by freeze-thawing method and thermally induced phase inversion processing technique. The mechanical and friction property of PVA were tested. The biocompatibility and mechanical property of nHA/PA66 scaffold were also investigated. The results showed that the tensile strength of PVA was 1.94MPa, the mean of friction coefficient in physiological saline and in plasma substitute were 0.076 and 0.085, respectively. The n-HA/PA66 scaffolds exhibited high porosity (about 80.93%) and a pore size ranging from 50 to 500 um. The compressive strength and modulus of scaffolds were 0.88 MPa and 15.21 MPa. Such a material exhibited good biocompatibility and high bioactivity.
  • Synthesis of Brush Polymers via Bergman Cyclization
    Jian-Guo Ma;Shu-Juan Liu;Sheng Deng
    . 2012, 43(03): 375-378.
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    Two brush polymers were synthesized utilizing two Frechet enedyine-containing dendronized polymers via Bergman cyclization at 282℃ under vacuum, respectively. The brush polymer were characterized with a variety of brush techniques, including IR, UV-vis, GPC, NMR spectroscopy and wide-angle laser light scattering technology. The results indicated that the brush polymers with conjugated structure were obtained.
  • Thermophysical Properties and Thermal Resistance Function of Permeable Asphalt Concrete
    Wei Jiang;
    . 2012, 43(03): 379-382.
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    In order to research thermophysical properties of permeable asphalt concrete, the indexes such as thermal conductivity, specific heat capacity and thermal diffusivity was computational researched between permeable asphalt and density graded asphalt concrete based on thermodynamic theory, the relationships between thermophysical properties of permeable asphalt concrete with air void & moisture content were analyzed; indoor irradiation experiment was designed for determination the temperature change of PAC & AC specimens. Theoretical calculation results indicate that permeable asphalt concrete is reduced by 20% with thermal conductivity, 10% with thermal diffusivity, which is compared with density graded asphalt concrete; Indoor temperature measurement results indicate that compared with density graded asphalt the temperature is decreased by 2~2.5℃ in the surface and 3~3.5℃ in the bottom of permeable asphalt concrete specimen, shows that permeable asphalt has function of thermal resistance, has strong resistant ability for the temperature load variation. Theoretical calculation results were verified.
  • Temperature Coefficient of Resistance Based on Conductive Rubber Filled by Carbon Black
    Hong-Sheng Jiang;Ying Huang
    . 2012, 43(03): 383-386.
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    Conductive composites are consisting of carbon particles (CB3100) and silicone rubber matrix. The temperature coefficient of resistance (TCR) based on conductive silicon rubber was analyzed for the dosage of filler. It studied the different filler blend in matrix of the conductive composites. Analysis the resistivity calculation model of conductive carbon black/silicone rubber which based on the theory of tunneling, the TCR model has been calculated, combined with experiments: Temperature affects the TCR of the conductive carbon black/silicone rubber, by act on resistivity of conductive carbon black/silicone rubber; The volume thermal expansion of matrix increased the resistivity of composites, the Positive TCR of conductive composites enhanced; Tunnel effect between Carbon black particles reduces the resistivity of composite materials, the Negative TCR of conductive composites enhanced. By adding a small amount of carbon nanotubes in the carbon black/silicone rubber, due to the synergetic effect of carbon nanotubes and carbon black in a rubber system, conductivity and stability of conductive composites enhanced.
  • The structure and ferromagnetic properties of the single phase Bi0.95Eu0.05Fe0.95Co0.05O3 Nanoparticles
    Xing-Ao Li;Peng Li;Yong-Tao Li
    . 2012, 43(03): 387-389.
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    Bi0.95Eu0.05Fe0.95Co0.05O3 Nanoparticles sample was prepared by sol-gel process。The microstructure and morphology of samples have analysised by X-ray diffraction(XRD) and scanning electron microsopy(SEM),the result indicated that it was the single phase rhombohedral perovskite structure。The X-ray absorption spectroscopy（XAS）of Fe 2p in samples showed that the mixed valence states (Fe2+ and Fe3+) of Fe ions。The magnetic characteristics of the samples were measured by vibrating sample magnetometer (VSM)，The results showed that the weak metamagnetism were obtained from clear hysteresis loop，compared with BiFeO3 sample, the magnetic properties were signi?cantly enhanced。
  • Numerical Simulation of Thermocapillary Convection in Detached Solidification under Axial Magnetic Field
    Zhen Li;Lan Peng;You-Rong Li
    . 2012, 43(03): 390-393.
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    Abstract: In order to understand the effect of axial magnetic field on thermocapillary convection in detached solidification, a series of 3-D numerical simulations of thermocapillary convection of CdZnTe melt are conducted by using the finite-difference method. The results indicate that the approach of using axial magnetic field is an effective way to suppress the thermocapillary convection. At the same time, smooth isotherms and small temperature gradients are observed by using the axial magnetic field. Besides, when the magnetic field intensity is kept unchanged, the thermocapillary convection gets weaken with the increase of the gas gap.
  • Crystalline structure of AlCrTaTiNi high entropy alloys
    Li-Dong Zhang;Chun-Hai Liu;Hua-Dong Sun
    . 2012, 43(03): 394-397.
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    Crystalline structure of AlCrTaTiNi high entropy alloys (HEAs) with lower resistance were prepared by a four targets magnetron sputtering method in pure argon atmosphere. Four-point probe (FPP), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for characterization of electrical property and microstructure. The results show that the grain size is directly related to the power. The grain size is biggest while the power is 80 W, meanwhile the electrical resistivity is the lowest, about 160 . Moreover, various cross section morphologies have been evidenced by SEM shows that crystalline structure is not columns.
  • Remarkable antibacterial properties of copper and its oxide thin films against E coli
    Jing-An Yang;Chun-Zhi Li;Jun-Ying Zhang
    . 2012, 43(03): 398-400.
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    The Cu and Cu2O thin films with particle sizes of about 20~50nm were prepared on the quartz substrate, using DC sputtering technology with a copper target by adjusting oxygen and argon flow rate, and the interactions of Escherichia coli with the thin films were studied. The optical properties, crystal structure, morphology of the samples had been studied by UV-Vis spectrophotometer, grazing incidence small-angle X-ray diffraction (GIXRD) and SEM, respectively. The results exhibited that both Cu and Cu2O thin films had remarkable antibacterial properties against E coli. Besides metal ions antibacterial effect, Cu2O thin films also shows strongly photocatalytic inactivation effect under solar light irradiation. Because of solar light irradiation, metal Cu partially oxidized to Cu2O on the surface, which enhanced the antibacterial efficiency.
  • Effect of electropulsing ageing on microstructure and shape memory effect in Fe14Mn6Si8Cr5Ni alloy
    Shi-Zhou Yang;Ning Li;Yu-Hua Wen
    . 2012, 43(03): 401-404.
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    The effects of electropulsing ageing on microstructure and shape memory effect in Fe14Mn6Si8Cr5Ni alloy have been studied. The results show that electropulsing ageing after pre deformation has a much more remarkable improvement in shape memory effect than directly electropulsing after water quenching. The shape recovery ration in Fe14Mn6Si8Cr5Ni alloy can rise up to 70.3±1.0% through electropulsing ageing for 1 s, up to 87.5±1.0% for 300 s after 10% tensile pre deformation. The shape recovery ration of 87.5% is increased by 82.3% compared to that in a water-quenching alloy, while it can be only increased by 22.3% through directly electropulsing ageing. Metallographic and TEM analysis show that no thermal induced ε martensite in an alloy electropulsing aged after pre deformation appears and it results in increase of the austenite matrix. What is more, electropulse can accelerate collapsing of vacancies and dislocations introduced by pre deformation and the formation of stacking faults. It was the above two reasons that make the rapid improvement in shape memory effect through electropulsing ageing after pre deformation.
  • Study on the microstructure of the tannery sludge and solidified block
    Xun-An Ning;Yu Tian;Yun Zhou
    . 2012, 43(03): 405-408.
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    Abstract: The microstructure of the tannery sludge and solidified block was investigated by scanning electron microscope and energy dispersive X-ray spectroscopy(SEM-EDS). The results showed when mixed lime,fly ash,cinder and the tannery sludge was 0.12 kg, 0.02 kg , 0.08kg and 1.00kg respectively，the compressive strength and compactness of the solidified block was greatly improved when the curing time changed from 6 days、8 days、10 days、15 days to 20days. The solidifying agents played a significant role at the later stage. The SEM test also showed that the solidified sludge block exhibited the acicular structure when the curing time was 20 days and the magnification is 5000 times.The compactness of the solidified sludge mainly came from the ettringite,which was generated from the chemical reaction of lime、active silicate materials (fly ash and cinder) with water，and the longer curing time also played an important role in improving the compressive strength.
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