20 August 2011, Volume 42 Issue S3
    

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    综述
  • Research Progress on R-S-F type Fluorescent molecular Sensors for metal ions
    HOU Changjun;HUANG Qingjing;HUO Danqun
    . 2011, 42(S3): 581-585.
    Abstract ( ) Knowledge map Save
    Receptor-spacer-fluorophore（R-S-F type）fluorescent molecular sensors can be defined as a kind of molecules which contain three parts as host，fluorophore and linkage radical. The host part is ionophore which selectively recognizes guest, the fluorophore transmits messages, and the linkage radical is the bridge of the two other parts. R-S-F type fluorescent molecular sensors have two advantages as sensors for their good selectivity and sensitivity, and become a new means with good prospects in detecting metal ions. Based on different supramolecular host structures of crown ether, calixarene and porphyrin, from the angle of selectivity of those hosts, this article reviews characteristics and research progress of fluorescent molecular sensors for metal ions in recent five years, and concludes with the prospect of research direction and future development of fluorescent molecular sensors.
  • Research and Development of thermal radiation property of carbon composite
    ZHU Bo;CAO Weiwei;WU Yimin
    . 2011, 42(S3): 586-590.
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    The important research works of thermal radiation property of carbon composites were introduced in this paper, the research works were discussed by the measurement equipment, the mechanism of thermal radiation property of carbon composite and the correlation between preparation process and spectral emissivity, which supplies a reference to the investigation of high temperature carbon radiation composites in future.
  • Latest research progress of drug stability and release of PLGA microspheres
    WANG Mingbo;FENG Qingling;SHE Zhending
    . 2011, 42(S3): 591-595.
    Abstract ( ) Knowledge map Save
    Poly (lactide-co-glycolide, PLGA) is a kind of degradable synthetic polymer which has been intensively studied as the matrix of controlled release systems. The good prospect is mainly based on its good biocompatibility, controlled biodegradability and the fact that it has been accepted for clinical applications by US / EU FDA. The microsphere controlled release systems are able to extend drug’s half-life and enhance therapeutic efficacy, so they are preferentially selected in drug delivery and biomaterial domains. The stability and release dynamic of drugs are two key issues that decide the therapeutic efficacy. This review focuses on the recent studies about the drug stability and drug release dynamic, associating our researches about the PLGA microsphere loaded with rhBMP-2 and the rhBMP-2 derived peptides. The available PLGA controlled release products are listed and the expected future is proposed.
    • 研究与开发
  • Preparation of petroleum coke based monolithic activated carbon and its adsorption performance for CO2
    GE Ming;XIE Fei;ZHAN Liang
    . 2011, 42(S3): 596-598.
    Abstract ( ) Knowledge map Save
    Monolithic activated carbon (MAC) was prepared with petroleum coke based high surface area activated carbon and phenolic resin as raw material and binder, respectively. After high surface area activated carbon was molded, its specific surface area decreased from 2621 to 1887 m2/g. Under the adsorption condition of 25 ℃ and normal pressure, the prepared MAC had a high saturated adsorption amount of 2.15 mmol/g for CO2. When the concentration of CO2 was 15 %, the equilibrium adsorption amount of MAC was 0.96 mmol/g. If CO2 was desorbed by vacuumizing to 2 kPa, the adsorption/desorption cycle efficiency was about 77.5 %. Once CO2 was desorbed with electric swing adsorption at 50 ℃ and then vacuumized to 2 kPa, the cycle desorption efficiency was about 100 %.
  • Structure, Optical Properties and Growth Mechanism of GaN Film Grown on Metal Buffer Layer by APCVD
    LIANG Jian;ZHAO Dan;ZHAO Junfu
    . 2011, 42(S3): 599-603.
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    GaN film were deposited on the compound buffer layer or the metal buffer layer to decrease the effects of the lattice mismatch(+17 %) and thermal mismatch (-54 %) between GaN and Si. In this paper, Al and Au/Al metal buffer layers were respectively evaporated on Si (100) substrate by electron beam evaporation, and GaN films was grown on these metal films by atmospheric pressure chemical vapor deposition (APCVD). The phase, structure, composition, morphology and optical properties of each sample were analyzed and compared respectively using High-Resolution X-Ray Diffraction (HRXRD), Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-Ray Spectroscopy (EDS) and photoluminescence(PL). The results show that all products are composed of hexagonal wurtzite structure of GaN polycrystalline films. The PL spectra of three samples have shown a strong near band edge emission peak and a weak yellow luminescence peak. After inserting the metal buffer layer, the densification, crystallinity and emission intensity of GaN film are improved, and its growth orientation was occurred a significant change with different buffer layer or substrate. Finally, the growth mechanism of this GaN film is discussed
  • Kinetics and mechanism study on chlorine dioxide generation with hydrogen peroxide
    ZHU Mingxin;HUANG Hui;DONG Xian
    . 2011, 42(S3): 604-609.
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    The reaction between hydrogen peroxide and sodium chlorate in presence of aqueous sulfuric acid was studied at various temperatures and molar concentrations of hydrogen peroxide, chlorate and sulfuric acid. The reaction rate law was established by analyzing the consumption of chlorate or hydrogen peroxide. Reaction order has been found 0.5 and 1 with respect to hydrogen peroxide and chlorate concentration, respectively. Reaction order was found about 5.99 with respect to molar concentration of sulfuric acid but it reduced to 1.64 when acidity function, h-, was substituted in place of molar concentration. The temperature dependence of the reaction was also investigated and pre-exponential arrhenius parameter as well as activation energy were determined. Reaction mechanism compatible with the reaction kinetics was proposed.
  • The chromatics study on calcining coal series kaolinite of surface surported cobalt
    GAO Feng;WANG Zheng
    . 2011, 42(S3): 610-612.
    Abstract ( ) Knowledge map Save
    The whiteness and color tone of the calcined product of kaolin have been influenced in large extent, because of the existence of iron impurity, while it is impossible and economically unfeasible to be removed completely by the existing technology, so the application of kaolin has been restricted seriously. A coal series kaolinite sample from Shanxi province with lower iron content was selected, cobalt was supported on the surface of sample by chemical deposition and the chromatics study of calcined product of the treated sample was carried out in this paper. The results indicated that: 1) Compared with that of original sample, the whiteness of calcined products of the treated sample are increased in 2-5 degrees and the a*, b* values can be adjusted from plus value (i.e. red-yellow) to minus value (i.e. blue-green). 2) The appropriate addition ratio of cobalt salt to sample is in the range of 1/500~1/700, especially to the coal series kaolinite sample used in this study.
  • Correlation between surface structure and moisture absorption performance of carbon felt
    ZHAO Wei;CAI Fei;CAI Xun
    . 2011, 42(S3): 613-616.
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  • Structure and properties of three kinds of bacterial cellulose films
    ZHANG Chuanjie;WANG Liu;WANG Zhikai
    . 2011, 42(S3): 617-620.
    Abstract ( ) Knowledge map Save
    Three kinds of bacterial cellulose films were prepared by different drying methods, which included electrothermal drying without hot-air, vacuum drying and freeze drying, and bacterial cellulose films were named BC1, BC2 and BC3 accordingly. The structure of bacterial cellulose films was characterized using scanning electron microscopy (SEM), infrared spectroscopy (IR) and X-ray diffraction (XRD). Physical and mechanical properties, porosity, absorbing water capacity, preserving water capacity, water vapor penetration rate, transparency and thermal stability of BC films were tested. The results showed that the surface of BC1 films were uniform and dense, cavities and cracks configurations existed in BC2 films, and cavities and layer structures were observed in BC3 films. All the three kinds of bacterial cellulose films demonstrated a crystalline form of cellulose I and the crystallinity of BC1 films, BC2 films and BC3 films were 73.9%, 63.8% and 58.2%. Of these three kinds of BC films, Young's modulus, breaking strength, transparency and thermal stability of BC1 films were best, porosity, absorbing water capacity, preserving water capacity, water vapor penetration rate of BC3 films were best, and properties of BC2 films were in between.
  • Hydrothermal Synthesis of doped chromium Spinel-type lithium ion-sieve and Its Lithium Adsorption Properties
    ZHOU Huimin;YUAN Junsheng;ZHANG Liang
    . 2011, 42(S3): 621-624.
    Abstract ( ) Knowledge map Save
    The spinel-type precursor doped by chromium was directly synthesized via the hydrothermal synthesis with the raw materials of Mn(NO3)2,LiOH ,H2O2 and Cr(NO3)3?9H2O. The ion-sieve with the selectivity to lithium ion was prepared further by extracting lithium ions from the Li- Cr-Mn-O lattice of the precursor with the acid. The characterizations of the precursor were carried out by XRD and IR and the ion-exchange properties were measured in pure lithium solution. The almost pure cubic Li(Mn0.8193Cr0.1807)2O4 crystals was obtained at temperature of 160 ℃ for 12 hours ,when the LiOH concentration was 1.1 mol?L-1, the H2O2 concentration was 0.3 mol?L-1 the mole ratio of Mn to Cr was 20. The maximum adsorption capacity of LiMnCrO to the lithium in pure Li solution was 22.263 mg?g-1, and the chromium in ion sieve could reduce dissolved manganese.
  • Effects of Operation Conditions on the Performance of a Planar SOFC
    LI Xibao;WANG Hongxing
    . 2011, 42(S3): 625-627.
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    Effects of hydrogen flow rate and operation temperature on the electrical properties of Ni-YSZ anode-supported SDC electrolyte planar IT-SOFC were investigated. The results showed that hydrogen flow rate influenced the electrical properties of SOFC remarkably. The maximum current density increased with the increasing of hydrogen flow rate. When hydrogen flow rate reached a value, which called the threshold value, the maximum current density did not change with the increasing of hydrogen flow rate. Within the intermediate temperature, the maximum power density increased with the increasing of temperature. The ohmic polarization in the lower temperature and the concentration polarization in the higher temperature influenced the output performance of SOFC.
  • Influence of Surface Mechanical Attrition Treatment on Low-temperature Rapid Pack Aluminizing layer of Oil Casing Steel N80
    HUANG Min;WANG Yu
    . 2011, 42(S3): 628-631.
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    Pack aluminizing processing was carried on oil casing steel N80 before and after surface mechanical attrition treatment (SMAT) for 90min by using of pack powder with a low-point additon. The metellograph and microhardness of oil casing steel N80 after SMAT for 90 min was analyzed by means of metallographic microscope and mircohardness test instrument. The microstrucuture and element distribution spectrum as well as microhardness of aluminizing N80 steel were also analyzed with SEM, EDS and microhardness test instrument. The study results show that a plastic deformed layer with a thickness around 50 μm can be formed after SMAT, which consists of some small sized grains. The microhardess of oil casing steel N80 can be obviously improved in the thickness range of deformation layer after SMAT. Compared with non-SMATed N80 steel, the aluminizing layer of SMATed oil casing steel N80 shows a denser and more continous microstructure, a bigger thickness as well as a higher microhardness. Consequently, SMAT can not only improve the thickness of aluminizing layer but also is helpful for aluminizing layer to be a better morphology and a better corrosion resistance.
  • Stab-resistance of shear thickening fluid enhanced Nylon fabrics
    LIU Wei;YANG Jinlong;XIAO Meng
    . 2011, 42(S3): 632-634.
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    The stab resistance of shear thickening fluid (STF)-treated nylon fabrics was investigated. It is found that the SiO2/PEG400 dispersion with the solid loading of 10 vol.% is a typical shear thickening fluid and STF-treated nylon has an improvement in resistance of impact energy compared to neat nylon. Studies on the microstructure of the material damage mechanism indicate that Nylon fibres adheres to each other by STF addition while impacted by knife, which reduces the mobility of filaments and yarns in the impact zone, and the impact energy transfers through fibres at high speed. These results indicate that these novel materials can be used to fabricate flexible body armors that provide improved protection against stab threats.
  • Transmission Rate of Electromagnetic Wave in Concrete Material Surface
    ZHOU Daochuan;ZHU Haitang
    . 2011, 42(S3): 635-638.
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    By establishment of basic theoretical model of electromagnetic wave propagation on concrete material surface, get relationship of transmission rate and concrete electromagnetic parameters. Concrete material specimens were casted under laboratory condition and tested by electromagnetic pulse experimental apparatus. Effect and influence law of different concrete components and ages to the electromagnetic wave transmission is studied by the test result. Research shows that transmission rate in concrete material surface is only relevant with the material dielectric parameter. The greater concrete relative dielectric constant, the smaller transmission rate in surface is. Among the concrete casting components, unit volume water content has the most obvious influence on transmission rate. The greater unit volume water content, the smaller transmission rate is. When concrete age is before 20 days, transmission rate is growing with age rapidly; after 20 days, transmission rate will be maintained at a stable value.
  • Phase Transition Dynamics of Combustion Chemical Deposition in Preparation of Nano α-Al2O3 Coating
    ZHANG Zengzhi;WANG Botao
    . 2011, 42(S3): 639-643.
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    The phase transition dynamic model was build up with the reactant consistency as phase transition dynamic variable according to phase transition dynamics of combustion chemical deposition. Based on the principles of complete combustion、no excess atomizing agent and well-atomized effect, the experiment parameters with well-atomized effect was obtained by means of original liquid atomization evaluation and phase transition dynamic experiment. Even and compactα-Al2O3 nano ceramic coating was prepared , the micro structure and the surface topography was also studied by TEM and SEM.
  • Growth and transparent conductive properties of ITO Films on flexible polyimide (PI) Substrates
    ZHAO Jiaming;BIAN Jiming;SUN Jingchang
    . 2011, 42(S3): 644-647.
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    ITO films are deposited on flexible polyimide (PI) Substrate by DC magnetron sputtering, and its structural and electrical properties are systematically investigated by x-ray diffraction analysis (XRD), Hall Effect Measurement (HL) and UV-Vis spectrophotometer. The results indicate that the sputtering power and deposition pressure are the dominant factor for the transparent conductive properties of as-grown ITO films on PI substrates, and the effect mechanism of the sputtering power and the deposition pressure were systematically investigated. The high performance ITO transparent conductive film with the visible transparency of the 86% and the average resistivity of 3.1×10-4Ω?cm are successfully achieved at the optimized parameters.
  • Hydroxylation of phenol with H2O2 to dihydroxybenzene over Fe/FSM-16
    GAO Xiaohan;LV Xuechuan;CHEN Ping
    . 2011, 42(S3): 648-650.
    Abstract ( ) Knowledge map Save
    Modification of the mesoporous molecular sieve has been a hotspot of research in recent years. FSM-16 modified by iron was used to catalyze phenol with hydrogen peroxide to produce dihydroxybenzene. The Fe contents, amount of the catalyst, reaction time and reaction temperature that affect catalyst performance were in research. Under the optimization reaction conditions, water as solvent, conversion of phenol and selectivity of dihydroxybenzene are 25.4% and 88.9%, respectively. The recycle experiment of the catalyst displayed that Fe/FSM-16 could be re-used. The catalytic activity of Fe/FSM-16 is near to that of TS-1 which is used in industry production and shows good prospects for industrial applications.
  • Effect of Injecting Processes on the magnetic properties of high magnetic powders loading PPS /NdFeB bonded magnets
    YANG Kai;LIU Ying;LI Jun
    . 2011, 42(S3): 651-654.
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    Currently，the preparation of high loading PPS/NdFeB injection magnet is especially the focus of research. In this article, PPS/NdFeB bonded magnet and permanent device in practical use with magnetic powder loading being about 90(wt)% is prepared successfully, tested by DSC、SEM and Magnetizing Curve Tester in order to be characterized with microstructure and magnetic performances , and analyzed on processes parameters to the laws and reasons. The results show that while injection temperature, velocity and pressure is 305℃, 90%υmax and153MPa, bonded magnet(Φ10X10mm) can obtain 5.12 g/cm3 of density, and the magnetic performances ((BH)max, Br ,Hcb ,Hci) of which can reach to 47.1kJ/m3 ,0.53T ,647.3kA/m respectively. After being magnetized for 24 poles, surface magnetic field intensity of bonded permanent device (diameter Φ 20mm and inner Φ18mm) can achieve 145.06mT.
  • Fabrication and optimization of TiO2 photoelectrode for dye-sensitized solar cells
    HUANG Shufan;WANG Liwei;YING Xuefeng
    . 2011, 42(S3): 655-658.
    Abstract ( ) Knowledge map Save
    This paper mainly investigated the optimum thickness of TiO2 nanocrystalline film prepared by screen-printing, the effects of large-particle scattering layer and TiCL4 treatment on the characteristic of dye-sensitized solar cell (DSSC). The results indicate that the adding of large-particle scattering layer and the treatment with TiCL4 can improve the photovoltaic performance of DSSC.
  • Characterization and controlling to the microstructure of Cu nanowire arrays
    NIU Gao;TAN Xiulan;HAN Shangjun
    . 2011, 42(S3): 659-661.
    Abstract ( ) Knowledge map Save
    Cu nanowire arrays has been fabricated within the pores of an anodic aluminum oxide (AAO) template by pulsed electrodeposition, and it has been characterized by scan electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray Diffraction (XRD). It was found that the peak value of pulse current and the assistant cathode are important factors to the surface quality of a Cu nanowire, the uniformty of length distribution of Cu nanowires and the length wave in a tiny area. To reduce the peak value of pulse current can improve the surface quality of a Cu nanowire, but it is not evident to improve the uniformty of length distribution of Cu nanowires and the length wave in a tiny area. To append an assistant cathode can improve the surface quality of a Cu nanowire, and it is evident to improve the uniformty of length distribution of Cu nanowires and the length wave in a tiny area.
  • Synthesis of Modified Polysiloxane/Nano-silica Hybrid Film and Its Hydrophobicity
    HAO Lifen;AN Qiufeng;XU Wei
    . 2011, 42(S3): 662-665.
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    A novel modified polysiloxane/nano-silica hybrid material (PSAMS-SiO2) with comb structure was prepared via sol-gel and graft copolymerization methods and then a superhydrophobic hybrid film on cotton fabric was also constructed with contact angle of water on its surface 157° through immersing-padding-baking processes. Chemical structure, thermal stability, micro-morphology and hydrophobicity of the hybrid material or film were investigated by the Fourier Transform Infrared Spectrum (FT-IR), Thermo-gravimetric analyzer (TGA), X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM) and Static contact angle analyzer, respectively. Results showed that thermal stability of the hybrid material was improved compared to modified polysiloxane, a hydrophobic hybrid film and many lotus-leaf-like micro-nano scale tubercles were coated on the surface of cotton fabrics which were the reasons why cotton fabric changed from hydrophilicity to hydrophobicity. In addition, with increase of the amount of PSAMS-SiO2, superhydrophobicity of the cotton fabrics increased.
  • Luminous properties of impurity state in quasi-1-dimensional wurtzite GaN nanowires
    ZHANG Li
    . 2011, 42(S3): 666-669.
    Abstract ( ) Knowledge map Save
    Taking the anisotropy of the quantum structure into account, the luminous properties of hydrogenic impurity state in a quasi-1-dimensional (Q1D) GaN-based nanowire are theortically analyzed based on the two-parameters variational approach. The numerical results show that the binding energy of impurity gound state reaches 190 meV, which is nearly the 2.5 times of that in GaAs-based quantum wires with the same size. This is quite consistent with the recent experimental measurement of impurity state in GaN nanowires. Furthermore, it is found that the trial wavefunction with two variational parameters for the description of impurity states in Q1D GaN nanowire is necessary, especially when the nanowire radius is small. At last, we also discuss the influencs of impurity position on the binding energy, the energy of ground state as well as the variational parameters. And the profound physical origin behind these observations is analyzed reasonablely.
  • Synthesis and applications of high quality type-Ib diamond single crystals in carats grade
    XIAO Hongyu;ZHANG Dongmei;ZANG Chunhe
    . 2011, 42(S3): 670-673.
    Abstract ( ) Knowledge map Save
    In the paper,the synthesis and application of high quality type-Ib diamond single crystals in carats grade were studiede by temperatuer gradient method(TGM) under a China made cubic anvil apparatus which produce high temperature and high pressure.By designing sample assembly,optimizing growth process and contolling growth speed,plenty of high quality type-Ib diamond single crystals in carats grade were synthesized successfully.The furface defects of synthetic diamond crystals were observed with scanning electron microscope(SEM). The effects of growth speed on crystals were researched, and the applications problems of high quality diamond crystals in carats grade as jewels in diamond industry were carried out systematically.We found that high quality tower-shaped diamond single crystal in carats grade requires high growth conditions.Unmatched carbon diffusion field,quick growth speed and high synethesis temperature can cause surface defects of crystals.The diamond with more metal inclusion or polycrystalline diamond will be synethesized when growth rate is too quick.Polished by the shape of roughcast diamond,many cut diamonds with squre shape,round shape or ellipse shape have been gained.The machining method can substantially reduce grinding and processing cost.
  • Preparation and Research of Casting Polysilicon
    LUO Dawei;ZHANG Jinling;ZHANG Shuang
    . 2011, 42(S3): 674-676.
    Abstract ( ) Knowledge map Save
    Today polysilicon has become the most important PV materials. The production of casting polysilicon ingot by directional solidification process has become a widely used method, But polycrystalline silicon ingots which are got by this process still have more defects, For example, low materials utilization and heterogeneous organization and so on. In order to further optimize the casting process, in this paper, self-designed vacuum induction melting furnace and directional solidification furnace were used for directional solidification experiments. The effect of quartz crucible and quartz ceramics crucible on ingot quality was comparatively investigated. The results showed that ingot with better surface quality and relatively well-developed coarse columnar grain structure could be obtained by use of silica ceramic crucibles coated high-purity silicon nitride. The average grain size of ingot was 3 ~ 4mm. Meantime, Nitride coatings could also effectively reduce the oxygen impurity content in silicon ingot.
  • Structure analysis and research of La, Eu-doped LDHs materials
    CHEN Junfei;SUN Yangyi;SHI Lin
    . 2011, 42(S3): 677-680.
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    The samples of Mg-Al-M-hydrotalcite-like (M=Eu, La) compounds were prepared by co-precipitation and through hydrothermal treatment. XRD, FTIR, TG/DSC and fluorescence spectrum were applied to analysis the structure and determine the properties of the samples. Results of XRD showed that typical diffraction peaks, which indicated the formation of layered structure, were observed in all three samples. TG/DSC demonstrated the thermal stability of the samples. Fluorescence spectroscopy analysis indicates that under excitation by 254 nm, the Eu-LDHs keep the characteristic spectral. The XRD and infrared spectrum analysis results revealed that a few ions in layers of were replaced by La3+, Eu3+ ions in our samples. La3+ and Eu3+ successfully insert hydrotalcite layer. Eu-LDHs is a new kind of monochromatic good red luminescence materials.
  • The study of Fabrication of three-dimensional micro-electrode structure for MEMS super capacitor by SU-8 photoresist
    WEN Chunming;YOU Zheng;WEN Zhiyu
    . 2011, 42(S3): 681-684.
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    In order to increase the surface area of MEMS super-capacitor electrode structure, improve MEMS super-capacitor charge storage capacity. In this paper, used the SU- 8 photoresist production high aspect ratio three-dimension electrode microstructures has been researched. After substrate cleaning, spin coating, soft bake, exposure, and post exposure, development and solidify membrane process, a microstructure of an aspect ratio of 6 was fabricated. Analyzes and discusses affection factor of the microstructure production process of basal cleanliness , increasing and decreasing the temperature，exposure time, development time for structure Fabrication. Experimental results show that, with the SU - 8 photoresist Fabrication of high aspect ratio three-dimension electrode microstructure can effectively increase the surface area of electrode structure on the same base area and improve storage density of the capacitor in unit base area.
  • Research on large panel dye sensitized solar cell
    WANG Ao;WU Congcong
    . 2011, 42(S3): 685-687.
    Abstract ( ) Knowledge map Save
    With the commercialization of dye sensitized solar cell (DSSC), the investigation of large panel DSSC has attracted much attention. DSSC panel with size up to 100 mm × 75 mm in parallel was fabricated by screen print method. The influence of DSSC size on the performance was investigated, and the photoelectrical property of large panel DSSC was studied. The results indicate that the fill factor decrease with increasing DSSC size. By using parallel connection the fill factor of large panel DSSC was dramatically improved compared with small size DSSC, and the fill factor of 0.63 was obtained.
  • Preparation and Research in Properties of ZnO:Al films
    LIU Dexiong;TANG Jinlong;WEN Cai
    . 2011, 42(S3): 688-690.
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    ZAO films were prepared on glass at 80℃ by electron beam evaporation with Al-doped zinc oxide. The technology of electron beam evaporation is easytomachine, low-priced. The properties of the films were investigated by X-ray diffraction spectrometer,optical microscopy, UV-VIS-NIR spectrophotometer and four-probe meter.The results show that all films are fairly smooth and compact, are found to have the six angle wurtzite structure with c-axis as the preferential growth orientation. In the visible area ,the very low resistivity of the films prepared at 80℃ is 1.7×10-3Ω?cm, and the max of the transmissivity in the visible area is about 90%.
  • Preparation of nanoencapsulated electronic inks by complex coacervation
    WANG Dengwu;WANG Fang;MA Sude
    . 2011, 42(S3): 691-693.
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    In this paper, the nanoencapsulated electronic ink containing TiO2 nanoparticles modified with stearic acid dispersed in Tetrachloroethylene（TCE）were prepared by complex coacervation using Gelatin-Gum acacia as wall materials, and the factors effected the dispersion ability of suspension was discussed, and the nanoencapsulated electric inks were also prepared. The results showed the dispersion was able to be obtained by optimizing the factors. The nanocapsules prepared with uniform size distribution, and the TiO2 nanoparticles were encapsulated in nanocapsules identified by TEM.
  • The research and microscopic analysis on wear resistance of Methyl methacrylate (MMA) / polyurethane elastomer
    LI Yabin;HUANG Jintian
    . 2011, 42(S3): 694-698.
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    In order to improve the utilization of woodiness material degradation, this paper firstly synthesized polyurethane elastomer using liquid degradation and copolymerizated the polyurethane elastomer by utilization of methyl methacrylate, which found that along with the initiation of MMA the performance and hardness of compound solvent resistance are both increased. When the content of MMA is 30%, and at this point its wastage, friction torque and friction coefficient are all the biggest. As the joining of MMA the material fracture changed from understanding fracture to the accurate understanding fracture shift and they are typical of brittle fractures. Using the AFM it can be observed that MMA/elastic polyurethane total body formed between the molecular structure of interpenetrating. Through the microcosmic comparison with unmodified polyurethane elastomer,the average size of molecular increases 0.11 nm, the average height of molecular increased 3.985 nm, and molecular area increased 0.67nm, and it also shows the formation of the molecules.
  • The Doped Effect Analysis of Lithium Iron Phosphate at Li and Fe Sites
    ZHANG Junxi;XU Mingyu;CAO Xiaowei
    . 2011, 42(S3): 699-702.
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    The modification of metal ion doping at different site in LiFePO4 was investigated in this paper. Co-precipitation method was used to synthesis LiFePO4 positive materials doped with Mg2+, Mo6+ at Fe site and Li site. The characterization and performance of synthesized material were studied by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Cyclic Voltammetry, Charge-discharge Curve and. Results show that Mg2+ and Mo6+ ions can be doped in Fe site and Li site of LiFePO4, and the doping will not affect its olivine structure. The electrochemical property and charge-discharge performance of materials were obviously improved whatever site doped in, and the material doped in Fe site is better than that in Li site. The doping mechanism was discussed basing crystal structure and semiconductor theory.
  • Study on the crystallization of Mg65Cu25Y10 bulk amorphous alloy induced by ultrasonic
    HUANG Kang;CHEN Gang;ZHAO Yutao
    . 2011, 42(S3): 703-706.
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    The specimens of Mg65Cu25Y10 bulk amorphous alloy with thickness of 3mm were fabricated by conventional copper mould method, and which were treated by power ultrasonic with frequency of 20KHz at room temperature（22℃）, 120℃ and 160℃. They have been treated for 2min, 5min and 10min, respectively, under each temperature. After ultrasonic processing, the ones obtained under different conditions were examined by XRD. From the images of Scanning Electron Microscope (SEM), we could see the dispersed crystalline particles and feathered ones with bigger size. The EDS patterns shew that the small particles were Mg2Cu, and the feathered ones were close to the master alloy. From the images of SEM, the crystalline phases and feathered particles distributing on amorphous become more and bigger with the increasing of ultrasonic processing time. The Vickers hardness of different specimens increases as the processing time increases.
  • inverse gas chromatography characterize hydrotalcite modified by surfactant and silane jointly
    FU Xiaowei;NI Zheming;WANG Qiaoqiao
    . 2011, 42(S3): 707-711.
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    Magnesium-aluminum hydrotalcite compound with Mg/Al ratio of 2:1 was synthesized by coprecipitation. Then the Mg/Al-HTwas modified by SDS, MTMS and both of them to yield three hybrid materials which are SDS-HT, MTMS-HT and SDS-MTMS-HT. The surface properties of Mg/Al-HT, SDS-HT, MTMS-HT and SDS-MTMS-HT were characterized by inverse gas chromatography, using polar and non-polar probes. The free energy of adsorption (ΔG0), the dispersive component of the surface energy (γSd), the specific interaction energy (△Gsp) and the interaction parameters(χ12)were estimated by using the retention time of different probes. The results indicated that γSd of hybrid samples was lower than that of Mg/Al-HT, the surface of hydrotalcite compound became less basic after treating. The affinity between modified-hydrotalcite compound and organic compounds was improved obviously, interaction between SDS-MTMS-HT and organic compounds was strongest. The samples were investigated by XRD, FTIR, TG and DTA, showing that SDS had been adopted in the interlayer, MTMS had condensed with the hydroxyl groups on the hydrotalcite surface, the sample modified by SDS and MTMS was most stable and hydrophobe of all, namely, had the best affinity.
  • One-step continuous synthesis and granulation of konjac super absorbent
    WANG Xu;KE Baisheng;WANG Chao
    . 2011, 42(S3): 712-716.
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    Superabsorbent polymer(SAP) was prepared though a novel one-step synthesize. The liquid polymer was squeezed from stress squeeze device and dispersed to granulation. In dispersed phase, granule was dehydration and continuous synthesis. SAP was prepared by grafting sodium acrylate on to konjac glucomannan with potassium peroxydisulfate（K2S2O8）, alumina(Al2O3) ,N，N -methylene bis-acrylamid(MBA) and polyethyleneglycol-600 (PEG-600) as initiator , first step crosslinker，second step crosslinker and dispersed phase respectively. The effect of various experimental conditions on the water absorbency was investigated. The results of Box-Behnken experiment design show that the granule is capable of absorbing pure water 731g/g when the mount of alumina is 0.245g, the polymerization time is 80min, the mount of MBA is 0.08g, the second crosslink time is 42min, and the drying time is 40min at 70℃.
  • Determination and analysis of specific surface area and pore structure of graphite fibers
    ZHENG Mingfei;ZHANG Aiqing;YANG Tianyao
    . 2011, 42(S3): 717-720.
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    To quantitatively describe and analyze specific surface area and pore structure of graphite fibers, in this paper, nitrogen adsorption-desorption isotherms of graphite fibers were measured by low temperature nitrogen adsorption method at liquid nitrogen temperature and different pressures. It shows that graphite fibers are microporous material which contains a large number of microporous and a few of mesoporous; the BET specific surface area, total pore volume and average pore size of graphite fibers were 541.00 m2 / g, 0.2436 cc / g and 1.8010 nm, respectively, and the specific surface area, pore volume and pore diameter of its microporous were 535.53 m2 / g, 0.2331 cc / g and 0.9896 nm, respectively; there is a narrow pore size distribution of graphite fibers, which mainly is a large number of microporous about 1.4 nm and a few of mesoporous about 2.0-7.7 nm, and the microporous is the greatest contribution to the specific surface area and the pore volume.
  • Preparation of Zinc-doped Silica Gel Materials and Their Adsorptive Performance
    LIU Dengwei;HE Yongjun;ZHANG Chao
    . 2011, 42(S3): 721-723.
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    Zn-doped silica gel adsorbents were prepared by an impregnation of water glass and zinc salts with ceramic fibers as substrates. The products were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and specific surface area analyzer. The influence of the preparation conditions, such as soaking time, soaking temperature, zinc salt concentration, the amount of acid and reaction temperature, on the absorption performance of the materials were investigated. SEM images revealed that the particles of Zn-doped silica gel were well scattered on the surface and in the apertures of the ceramic fibers. In the FTIR spectra, the peak at about 829 cm-1 was attributed to the Zn-O-Si linkage of the Zn-doped silica gel. The adsorptive performance of Zn-doped silica gel adsorbents was much higher than that of the ordinary silica gel. The optimized reaction condition for the preparation of Zn-doped silica gel was as follows: soaking time was 60min, dipping temperature was 20℃, zinc content was 30%, reaction temperature was 60℃, and the amount of the added hydrochloric acid was 1.5 mL.
  • Preparation of Super Absorbent Resin Made from Straw fiber
    . 2011, 42(S3): 724-727.
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    Super absorbent resin (SAR) was prepared via aqueous solution polymerization with wheat straw, acrylic monomer and montmorillonite. The influences of treatment methods of wheat straw and the dosage of crosslinking agent on absorbency of super absorbent resin were investigated. The structure of SAR was characterized by FT-IR and SEM. Results show that the performance of SAR with etherified wheat straw is best. The absorbency of resin is increased and then decreased along with an increase of the dosage of crosslinking agent. Graft polymerization take place between acrylic monomer and wheat straw. SAR shows a typical three-dimensional network.
  • Preparations and Photoelectrochemical Property Research of Layer-stacked TiO2/SnO2 Nanosized Composite Films
    Wang Aiping;HE Minghui;YIN Yansheng
    . 2011, 42(S3): 728-731.
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    Abstract: The layer-stacked TiO2/SnO2 nanosized composite thin films were successfully prepared by sol-gel method and deposited on different subtracts. The synthesized and the surface micrograph of the composite thin films were characterized physically by X-ray diffraction (XRD) and scanning electron microscope (SEM). The photo absorbance activity and photoelectrochemical activities of the layer-stacked TiO2/SnO2 nanosized composite thin film were examined by absorbance plots and OCP-t plots under ultraviolet (UV) illumination. The result of phase construction show that composite thin films have rutile phase of TiO2 and anatse phase of SnO2 at 450℃ heat treatment. The results of the characterization indicate that layer-stacked TiO2/SnO2 composite films are compact and homogeneous than single TiO2 thin films. The layer-stacked TiO2/SnO2 composite thin films prepared exhibits higher absorb activity and wide absorb spectrum at visible light spectrum in contrast to single TiO2 films. The photoelectrochemical effect of SnO2 lay number of the composites films was also investigated by OCP-t plots. The results showed that the layer-stacked TiO2 /SnO2 composite thin films can charge storage upon UV illumination and this stored charge could be released slowly on cessation of illumination thereby maintain sufficiently photoelectrochemical capability of TiO2 when UV light shut off. By the contrast, the composite films with three layer SnO2 loading had the highest charge storage capacitance and maintain efficiency.
  • Microwave Dielectric Properties of low-loss (Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4 Ceramics
    YAO Guoguang;PEI Cuijin;MA Hong
    . 2011, 42(S3): 732-733.
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    The sinterability, phase compositions and microwave dielectric properties of (Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4 ceramics were investigated. The structure and microstructure were analyzed by X-ray diffraction and Scanning electron microscopy techniques. The XRD patterns show a cubic spinel structure for (Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4ceramics with the lattice parameters of a=b=c=8.48794 ?. With increasing sintering temperature, the relative dielectric (εr) and quality factor (Q?f) first increase and decrease thereafter, the temperature coefficient of resonant frequency (τf) changes slightly. The (Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4 sintered at 1325 oC/5h exhibited good microwave dielectric properties: εr=13.1, Q?f=131 170 GHz( 10GHz ) and τf =-55.6 ppm/oC.
  • Purification of polyether polyols made with double metal cyanide catalysts
    YANG Liu;MA Weihua;XU Jian
    . 2011, 42(S3): 734-737.
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    Abstract： The process of purification of polyether polyols of N-330 made with double metal cyanide catalysts was studied by adsorption, in which zinc ions and cobalt ions were removed from the polyether polyols. The optimum sort and amount of adsorbents were established; the optimum adsorption conditions of chelating fiber adsorbent and the reusing tests were studied. The results showed that the optimal conditions were obtained as：the amount of chelating fiber added was 3.33 parts by weight per each 100 parts by weight of the polyether polyols treated and the polyether polyols were adsorbed for 40 min at 60℃, in which conditons the removal rate of zinc and cobalt ions were the highest, 77.1% and 40.5%, respectively. The chelating fiber was reused 4 times, and the removal rate of zinc and cobalt ions were 74.1% and 26.4%, yet.
  • Research on tris(8-hydroxyquinoline)aluminum coated by SiO2
    ZHANG Junping;WANG Hua;ZHANG Cun
    . 2011, 42(S3): 738-740.
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    Abstract: The article initially discussed the method of preparing Alq3 coated by SiO2 to improve the material interface of Organic light emitting device(OLED),which can prolong the lifetime of OLED. Transmission electron microscope(TEM),photoluminescence spectra(PL),thermo gravimetric analysis(TG) were used to characterize superficial morphology, luminescence and thermal stability properties of products,respectively, while the film microstructure of products was analyzed with scanning electron microscope(SEM) and X-ray photoelectron spectrometer(XPS).Finally,two OLEDs were fabricated with Alq3 and Alq3 coated by SiO2 as emitting layer, respectively, and their electroluminescent properties were tested. Results show that this method introduced in this article can greatly improve the lifetime of OLED.
  • study of Structure and performance for Laser welding of copper sheet
    LIU Feng;HUANG Hua;LI Tingjun
    . 2011, 42(S3): 741-743.
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    The laser welding of copper sheet was studied, the effect of welding current, pulse width, pulse frequency and welding velocity on the maximum joint tensile strength were researched by orthogonal experiment, and the metallographic structure and micro-hardness of the joint were analyzed in the paper.
  • Research of PpPD/GO/Au nanocomposite: Synthesis and performance in supercapacitor
    HAN Xiao;WANG You;LIU Shujuan
    . 2011, 42(S3): 744-747.
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    A novel conductive nanocomposite named poly(p-phenylenediamine)/graphene oxide/Au (PpPD/GO/Au) was synthesized via in situ polymerization using p-phenylenediamine(p-PDA) as monomer and HAuCl4 as oxidants and Au sources in the presence of graphene oxide (GO). The microstructure of the nanocomposite was characterized by FESEM、FT-IR and XRD patterns. And the results show that three phases including PpPD、GO and Au nanoparticles exist. Compared with single phase of PpPD or GO, the stability of the nanocomposite was improved greatly. And the highest specific capacitance of 237.5F/g could be obtained from the PpPD/GO/Au nanocomposite, which is higher than 11.25F/g of individual PpPD and 176.25F/g of PpPD/GO obtained by using FeCl3 and H2O2 as oxidants in the same condition. Obviously the specific capacitance of nanocomposite is improved significantly, which shows positive meanings in this field.
  • Research on Fabrication and Microstructure of in-situ nano-Al2O3 particles reinforced aluminum matrix composite
    ZHENG Meng;ZHAO Yutao;CHEN Dengbin
    . 2011, 42(S3): 748-750.
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    In-situ (Al2O3)np/Al composite was synthesized by the direct melt reaction (DMR) technique with Na2B4O7?10H2O and K2ZrF6 powders using a new reaction system. Microstructures and phases of the composite were analyzed by SEM, XRD and TEM. Results indicate that plenty of nano γ-Al2O3 particulates, whose sizes are 20~100nm, have been obtained and distributed uniformly in the aluminum matrix. The formation mechanism of nano-size Al2O3 particle is Reaction-Solution-Precipitation.The coherent relationship with γ-Al2O3(040)∥Al(200) exist in the interfaces between the Al matrix and the γ-Al2O3 particles, and no resultant production is found along these interfaces. Since the formation of nano Al2O3 particles, there are large amount of high density dislocations in the composite, which make it strengthening remarkably.
  • Application of FSS structures in the basic cloths of anti-radar camouflage screen
    HUANG Liuhong;CHEN Bin;XIE Wei
    . 2011, 42(S3): 751-754.
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  • Appliacation of the porous materials in noise defend of the duct
    AO Qingbo;TANG Huiping;LAN Tieshuan
    . 2011, 42(S3): 759-761.
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  • Microwave dielectric properties of (Y0.99R0.01)2Ti2O7(R=Pr, Tb, Ho, Er, Tm, Yb, Lu) ceramics
    XIAO Yuan;WANG Zhefei;GONG Zhijie
    . 2011, 42(S3): 762-765.
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    Abstract: The (Y0.99R0.01)2Ti2O7(R=Pr, Tb, Ho, Er, Tm, Yb, Lu) microwave dielectric ceramics were prepared by conventional solid-state route. The effects of Pr, Tb, Ho, Er, Tm, Yb and Lu doping on the phase composition, sintering characteristics and microwave dielectric properties of Y2Ti2O7 ceramics were investigated. The results indicated that the doping on the A-site improved the microwave dielectric properties of Y2Ti2O7 ceramics. The prepared samples maintain a single pyrochlore phase and show Y2Ti2O7 as the main phase. For R=Er, the (Y0.99Er0.01)2Ti2O7 samples sintered at 1450℃ for 4h have optimum microwave dielectric properties: εr= 44.3, Q×f=12021 GHz(5.371GHz), τf =+44ppm/℃, which are better than those of Y2Ti2O7 ceramics(εr= 54, Q×f=6565 GHz, τf =-31ppm/℃).
  • Synthesis of KY3F10 :Yb3+，Tm3+ nanocrystals fluorescence label material by pyrolysis
    WANG Liqiang;PENG Yong;XING Mingming
    . 2011, 42(S3): 770-773.
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    KY3F10:Yb3+,Tm3+ nanocrystals codoped with Tm3+ and Yb3+ were synthesized by the pyrolysis method. The obtained samples were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and upconversion spectra measurements. Effect of the Tm3+ molar concentration on the upconversion luminescent properties of the nanocrystals have been investigated. The experimental results show the samples can be readily indexed to pure cubic phase of KY3F10:Yb3+,Tm3+. The samples are spherical particles with a mean diameter of about 13 nm. Concentration quenching occurs when the doping mole fraction of Tm3+ is above 0.4%. Blue (481nm) and red (646nm) emissions from the prepared samples have been observed at 980nm laser excitation. Power-dependent investigation reveals that the blue and red upconversion fluorescence is three-photon upconversion process.
  • Influence of interface property on axial tension property of ablative-resistant C/C composite made by axial rod method
    LIAO Yingqiang;LIU Yongqiong;JI Alin
    . 2011, 42(S3): 774-775.
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    In order to give a direction to the post-treatment of ablative-resistant C/C composites made by axial rod method, in the base of progressive damage method and bilinear cohesive model, influence of interface property of C/C composites made by axial rod method on axial elasticity modulus and limit destruction load was researched. The analysis results show that axial elasticity modulus and limit destruction load is gradually increasing with interface strength enhanced, axial elasticity modulus is almost not changing with interface fracture energy enhanced, and limit destruction load is increasing slowly with interface fracture energy enhanced.
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