29 February 2012, Volume 43 Issue 04
    

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    研究与开发
  • One step template-free synthesis of nest-like Bi2WO6 microspheres and enhanced photocatalytic activity
    Zhen-Feng Zhu;Guang-Hong Yu;Jun-Qi Li
    . 2012, 43(04): 409-412.
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    The photocatalyst of orthorhombic uniform nest-like Bi2WO6 microspheres have been synthesized by microwave hydrothermal method at 200 ℃. The morphology and structure of nest-like Bi2WO6 microspheres were characterized by XRD analysis, SEM, TEM observation and UV-Vis spectrum, meanwhile we also investigate the photodegradation of RhB solution containing nest-like Bi2WO6 microspheres samples under visible light irradiation. The results indicate that nest-like Bi2WO6 microspheres exhibited good photocatalytic activity in degradation of RhB under 500 W Xe lamp light irradiation, it is bound up with size effect of nanoplates, big specific surface area of microspheres and accumulate structure of nanoplates，which is ascribed to multiple scattering within the hierarchical assemblies to the lengthened optical path length for light transporting so that enhance the efficiency of visible light.
  • Analysis of Laminar Flow of Magnetorheological Fluids in Circular Pipes Based on Non-convex Constitutive Model
    Fang-Yin Jin;Lin-Xiang Wang;Rong Liu
    . 2012, 43(04): 413-416.
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    In the current paper, the laminar flow of magnetorheological fluids (MRF) in circular pipes is analyzed based on a non-convex constitutive model. The constitutive model is capable of modelling the unique hysteretic property of the MR fluids. The flow velocity distribution is derived, and the volumetric flow rate is calculated. The pressure-flow characteristics curve of the MRF flow is obtained. The comparisons of numerical results between the non-convex constitutive model and the Bingham model are presented. It is shown that the non-convex model outperformance the Bingham model.
  • The Research of Specific Combination between Streptavidin and a Novel Biotin-graft-Poly (Lactic acid) Material as well as its Self-Assembled Nanoparticles
    Jiang-Min Jiang;Jun Pan;Wei-Min Jiang
    . 2012, 43(04): 417-420.
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    The aim of this research was to test the specific combination of biotin-graft-poly(lactic acid) (BPLA) as well as its self-assembled nanoparticles with streptavidin or biotin via streptavidin arm in vitro, from that the possible bioactivity of BPLA material and targeted property of self-assembled BPLA nanoparticles (NPs) could be judged. The results showed: the BPLA membrane can combine specifically with streptavidin;the self-assembled BPLA NPs can combine with streptavidin and biotin using streptavidin as an arm, on the simulated in vivo static and dynamic flow condition. Our results suggested BPLA and its self-assemble NPs might have a potential application in tissue engineering to control the cells’ growth and in target drug delivery.
  • Study on the Heating Performance of Graphite-based Conductive Mortar Electro-thermal Kang
    Fa-Qin Dong;Yue-Fei Peng
    . 2012, 43(04): 421-423.
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    Self-made graphite-based conductive mortar is selected to make electro-thermal kang heating plane and the model of kang has been designed in the north of China. Through Fluent numerical simulation analyzed the heating performance of electro-thermal kang, the result showed that the temperature of electro-thermal kang’s heating plane is evenly distributed, and heating effect is functional. Experimental result indicates that at 1kw rapid temperature increasing level, the temperature of electro-thermal kang increased rapidly, and the average increasing rate is 0.75℃/min, while at the safe-voltage temperature insulating level, the temperature of kang body remains at around 25.7℃, and the environment temperature increased 2.7℃ compared with that before the experiment.
  • Study on The Mechanism and Rules of Flexible Projection Screen Plasticizing
    Zhi-Ting Geng;Qing He;Li-Quan Guo
    . 2012, 43(04): 424-425.
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    Flexible projection screen has a flexible, easy to carry, impact resistance and other advantages, it is used very widely. In this paper, the growth of flexible projection screen presses rationale was research to identify the plasticizer dibutyl phthalate add the appropriate amount of plasticizer contentfound in plastic - brittle transition laws ,for the preparation of flexible projection display screen provides a theoretical basis.
  • ZnO nanotetrapod arrays based electrode dye sensitized solar cells
    Yue-Jun Feng;Pang Qi;Jun He
    . 2012, 43(04): 426-429.
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    In this work, we adopt the simple vapor transmission deposition (VTD) to prepare ZnO nanotetrapods and nanorod in case of no catalyst. The nano ZnO were characterized by powder X-ray diffaction (XRD), scanning electron microscope (SEM). X-ray diffraction (XRD) suggests a hexagonal ZnO phase. SEM shows that ZnO tetrapods have a core at the center with four arms of about 70 nm and arm lengths up to 300 nm, growing out from the core along four directions. The arm diameter of ZnO nanorods is about 84 nm. We introduce a photoanode architecture used Scraper method in dye sensitized solar cell comprising thick film of nano ZnO. More important, we measured the photoelectric performance of these photoanodes, a power conversion efficiency of ZnO tetrapods dye sensitized solar cells up to 1.88% (under 100mW/cm2) is far higher than ZnO nanorods dye sensitized Solar cells up to 0.7%.
  • Study on the Crystal Structure and Resistance Properties of the Boron-doped Diamonds Synthesized under static-pressure
    Jian-Hong Gong;Shu-Xia Lin;Jun Gao
    . 2012, 43(04): 430-432.
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    In present paper, boron-doped diamond was synthesized by static pressure method using Fe-Ni-C-B system catalyst. The morphology, crystal structure, resistance – temperature characteristic curve were studied. Experiments proved that the boron-doped diamond has different ionization energy at different temperature range. and the reason is analyzed. The maximum operating temperature is about 773K for such boron-doped diamond. This study provides an experimental basis for high-temperature semiconductor diamond.
  • Preparation and electromagnetism property of activated carbon loaded with Co0.8Zn0.2Fe2O4 ferrite
    Yu-Liang An;Hong-Chao Sui;Xia Yuan
    . 2012, 43(04): 438-441.
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    A novel activated carbon loaded with cobalt-zinc ferrite composite wave-absorbing materials was prepared by sol-gel method. The cobalt zinc ferrite sol was synthesized with citric acid as complexing agent, and the ferrite and activated carbon composite gel was obtained by vaporization treatment, then the activated loaded with cobalt-zinc ferrite composite was prepared by calcination of the gel. The effect of process parameters such as the sintering temperature, sintering time and ratio of carbon/ferrite on the morphology and structure of composite was studied in detail, in which the morphology and structure of composite were characterized by Scanning Electron Microscopy (SEM), Elements X-ray diffraction (XRD) and Energy Dispersive X-Ray Fluoresence Spectrometer（EDX）. Furthermore, the complex permittivity and permeability of the as-prepared composites were characterized in the frequency ranges of 8.2-12.4 GHz by the wave-guide method on the vector network analyzer, in which the higher electrical and magnetic loss tangent of the activated loaded with cobalt-zinc ferrite composite were obtained.
  • Study of GaSb Polycrystalline Films Grown by Co-evaporation
    Jian-Ming Ruan;Yan-Ping Sui;Tao Li
    . 2012, 43(04): 442-445.
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    The bandgap of GaSb is 0.72eV, which is an ideal material for thermo-photovoltaic. In this paper, GaSb polycrystalline thin films were grown on ordinary glass substrates by the method of the co-evaparation. By XRD, Hall and transmission-reflection spectrum, structural properties and optoelectronic properties were investigated under various Ga & Sb evaporation temperature、varied substrate temperature and different film thickness. It is shown that grain size is increased with increasing substrate temperature and thin film thickness; the mobility is increased with increasing substrate temperature、increasing thin film thickness and decreasing Ga evaporation temperature, which reaches 172cm2/V.s; the concentration is increased with decreasing substrate temperature、increasing Ga evaporation temperature and increasing thin film thickness.
  • Study of Electric Tunable Metamaterials
    Yu-Fang Chen;Yong-Jiang Zhou;Yong-Min Si
    . 2012, 43(04): 446-449.
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    The electromagnetic response of metamaterials is associated with the geometry of the unit cell，it can be tuned by alerting one or some parameters. In this paper, the lumped elements PIN-diodes which own changeable resistance were used in the designing of tunable metamaterial absorbers, and the experimental validation was presented too. Two different modes of laying the conducting wire which would bring distinct properties also been studied too. To the end, the impedance characteristics of the active FSS was discussed in the method of transmission equivalent circuit model.
  • The effect of temperature on the thermal conductivity of aluminum ntride ceramics
    Li-Ying Wang;Xiao-Lei Li;Tai-Chao Su
    . 2012, 43(04): 450-453.
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    [Abstract]: This article aims to study the effections of the temperature on the thermal conductivity of the aluminum nitride ceramics, under the condition of 5GPa/30min, using AlN powder produced by Geuther process as starting material and CaC2(3%wt) powder as sintering additive. The sintered AlN body were tested by XRD and SEM. The results show that the rise of the temperature（during 1500~1800℃） has important effects on the AlN ceramics, i.e. promoting the growth of the crystal grains inside the AlN ceramics, making full crystal grains with quidimensional size, decreasing the grain boundary phases, acquiring high-density AlN ceramics, and increasing the thermal conductivity of the AlN ceramics.
  • Study on rheological properties of thermal thickening gel
    Jing Liu;Guo-Wei Tai;Chun-Sheng Pu
    . 2012, 43(04): 454-456.
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    To characterize the rheological property of thermal thickening copolymers in situ gel and to analyze its solution to gel for explaining the mechanism. Based on the tetra-polymer solution, to characterize the shear modulus and loss modulus of thermal thickening copolymers under different temperatures, concentrations, to determine the gel properties, and compare the gel temperature with tube inversion. The results show that the critical temperature is 143℃, under a certain concentration (higher than contact concentration C *), lower this temperature copolymer has the general characteristics of viscous fluid; higher this temperature can form the gel network structure; under 65℃ to 240℃ loss angle of solution is changed from 56.27 ° to 31.04 ° and properties of solution is also changed viscous to viscoelastic fluid; This shows that the solution has thermal thickening properties under a certain concentration.
  • Preparation and in Vitro Degradation Performance Control of Composite Gel-film Consisted of Silk Sericin/Polyvinyl Alcohol/Maize Starch
    Zhong-Min CHENJia-Qing XIONG;Da-Gang LIAO;Hao LI
    . 2012, 43(04): 457-461.
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    Silk Sericin (SS) was extracted from waste cocoon and a series of composite gel-film(CGF) was prepared using SS, Polyvinyl Alcohol(PVA), Maize Starch(MS), etc. by aqueous phase blending and repeatedly freeze-thaw. IR spectroscopy confirmed the blending structure of CGF. In dissolved medium of deionized water and simulated body liquid(SBF), the SS/PVA mass ratio and MS content effect on the mechanical property, swelling ratio(SR), dissolved ratio(DR) of CGF were investigated, respectively. The tensile-strength of CGF was good and its break-elongation can be to achieve optimal when SS/PVA was 3/7 and MS content was 18%. The degradation rate of CGF can be regulated with the adjustment of SS/PVA mass ratio and MS content.
  • Microstructure and barrier performance of Ta/Ti-Al integrated film used as a barrier layer for Cu metallization
    Guo-Qiang Ren;Jin-Zhu Xing;Xiao-Hong Li
    . 2012, 43(04): 462-464.
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    Abstract: Cu (120nm)/Ta (5nm)/Ti-Al (5nm)/Si heterostructures have been deposited on (001) Si substrates using radio frequency magnetron sputtering method. Microstructure of the samples and barrier performance of Ta (5nm)/Ti-Al (5nm) integrated film have been investigated using atomic force microscopy (AFM), X-ray diffraction (XRD), and four probe method. No obvious impurity peaks can be found for the 850 ℃ annealed sample, indicating no evident reaction or inter diffusion happened at the interfaces of the sample during the high temperature annealing. Compared with 800 ℃ annealed sample, much rougher surface with sharp increase in root mean square roughness (RMS), coupled with a sudden increase in sheet resistance, implies Ta(5nm)/Ti-Al(5nm) integrated film cannot be used as a barrier up to annealing temperature of 850℃. Due to the good adhesion between Ta and Cu and good chemical stability of Ti-Al, Ta(5nm)/Ti-Al(5nm) integrated film has very good barrier performance at temperature lower than 800℃.
  • Synthesis and characterization of copolymers incorporating oxadiazole and carbazole units, Synthesis and characterization of copolymers incorporating oxadiazole and carbazole units
    Yong-Xiao Li;Dong-Feng Li;Rui-Bin Hou
    . 2012, 43(04): 465-468.
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    New non-conjugated random copolymers containing 2-phenyl-5-(methyl acrylamide-substituted phenyl )-1,3,4-oxadiazole (OXD) and Methacry acid ester ethylcarbazole were successfully synthesized by free radical polymerization method. Characterized by FTIR, 1H-NMR, UV-Vis, Fluorescence spectroscopy, TGA, DSC, and GPC. The test results showed that: the copolymers exhibited good solubility, such as THF, CHCl2, CHCl3 and so on, hight molecular weight (Mw=16950~22500). Their weight loss was less than 5 ％ on heating to about under nitrogen atmosphere. The DSC graph has only one glass transition, which represents there is no phase-separation in copolymer. The photoluminescence properties were characterized by UV absorption and fluorescence spectrum in detail. As well as good thermal stability and high glass transition temperature. The copolymers UV absoption range from 222 to 340 nm. The copolymers have good fluorescence. Under UV excitation, these copolymers emitted bright blue purple fluorescence at about 372~451 nm in THF solution. With units of oxadiazole increasing, fluorescence quantum yield of copolymers decreases. P（OXD8-CzEMA2） have good fluorescence, fluorescence quantum yield up to 0.70.
  • Research on formation and gas separation performance of polyetherimide based carbon molecular sieve membranes
    Jian-Na Yan;Hui-Yuan Gao;Yan-Gai Zhang
    . 2012, 43(04): 469-472.
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    Abstract: A-type carbon molecular sieve gas separation membranes were synthesized at different pyrolysis temperatures of 500-800 oC by dip-coating a commercial polyetherimide (PEI) precursor on a porous ZrO2-Al2O3 composite sol-modified alumina support and further treated by pre-oxidation in air. To investigate the influence of carbonization temperature on the carbon membrane structure and gas separation performance, thermal gravimetric analysis (TG), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and gas permeability tests were employed to systematically study thermal stability of polymer film during the pyrolysis, chemical structure of carbon films, carbon microcrystalline structure and gas separation properties. The results indicated that the carbon membranes derived from different carbonization temperatures possessed the different physical and chemical structure, carbon structures and pore structure, which affected the permeability and selectivity of the carbon molecular sieve gas separation membranes.
  • The rectification effect of the carbon nanotube / electrolyte interface
    Yong-Tian Wang;Zong-De Liu;Zhi-Yong Xue
    . 2012, 43(04): 473-475.
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    In this paper, the rectification effect of the carbon nanotub/electrolyte interface has been studied. The carbon nanotube was synthesized by the hot filament chemical vapor deposition (CVD), the rectification effect is tested by the voltammetric characteristics. In room temperature, the carbon nanotube /electrolyte interface showed obvious the rectification effect, which became evident with the increase of the temperature and concentration of the electrolyte. The mechanism has been discussed in detail.
  • Kinetcs of n-butane adsorption by activated carbon
    Xiao-Min Liu;Xian-Lun Deng;Guo-Dong Wang
    . 2012, 43(04): 476-479.
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    In this paper,activated carbon was prepared from sawdust,using chemical activation(the activation reagent was phosphoric acid).The effects of the adsorption time,the n-butane flow and the temperature on the adsorption of the n-butane were investigated.The kinetics of adsorption at different temperature were studied as well.The experimental results show that the adsorption of the butane is a rapid physical process with adsorption and desorption coexisting.The flow of n-butane significantly influence adsorption rate and adsorption time,but it has little influence on the amount of n-butane adsorbed at equilibrium(qe).The amount of n-butane adsorbed at equilibrium decreases with the increase of temperature.It indicaties activated carbon adsorption of n-butane is a exothermic reaction.It is also found that the sorption kinetics are satisfied with Bangham equation with R2 > 0.99. The value of qe obtained through Bangham equation is very close to the value of experimental data.Therefore the ideal adsorption rate equation can be obtained by data fitting.
  • Preparation and soft magnetic properties of large degree amorphous transformer core
    Xue-Jiao Xu;Zheng-Hou Zhu
    . 2012, 43(04): 480-483.
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    A new preparation method of amorphous transformer core is studied in this paper. The amorphous transformer core is prepared by combined multiple low degree Fe-based cores after annealed and cured at the two sides of the cores. The results show that the power transformer cores with the height of 200mm manufactured by Fe78Si9B13 with the width of 50±0.2mm and the thickness of 33±2μm after annealed at 420℃ for 2h have similar soft magnetic properties with the original cores with the height of 50mm. when the test frequency is 1KHz, the values of Br/Bs and Bs of the combined amorphous transformer cores are 0.5-0.7、1.4-1.5T respectively. The combined transformer cores have excellent soft magnetic properties which can meet with the demand of power transformers.
  • Effect of Magnetron Sputtered CrC Composite Coatings on Performance Reliability of Bearing
    Jia-Dong Chang;Gui-Xi Jia;Zhen Li
    . 2012, 43(04): 484-486.
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    Using the closed-?eld unbalanced magnetron sputtering ion plating techniques, CrC composite coatings was prepared on the steel ball substrate of bearing 6204. The performance reliability of coated steel ball bearing and uncoated bearing were tested and been comparatived analysis. Results indicated that, Compared to the uncoated bearing, the CrC coatings steel ball bearing significantly reduced the value of bearing vibration, improved vibration stability and resistance to temperature performance, and had good performance reliability.
  • Preparation and Properties of PAPy/MWNTs Composites
    Yu-Ying ZHENGPan Wang;
    . 2012, 43(04): 487-491.
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    Conducting poly(3-acylpyrrole) (PAPy)/multi-wall carbon nanotubes (MWNTs) composites have been synthesized by the in situ chemical polymerization of 3-acylpyrrole (APy) on MWNTs. The structure and properties of the resulting PAPy-MWNTs composites was studied by FT-IR, XRD, FE-SEM, HR-TEM and TGA. FT-IR results indicated that no chemical reaction occurred between the PAPy and MWNTs, and only the MWNTs served as a template for APy polymerization. FE-SEM and TEM studies suggested that PAPy was only coated on the surface of carbon nanotubes and the thickness of the PAPy coating on each nanotube depended on the feed ratio of APy to MWNTs. TGA indicated that the MWNTs can improve the thermal stability of PAPy/MWNTs composites. In addition, the standard four probe method was used to measure the electrical conductivity of the samples at room temperature, and the results exhibited the electrical conductivity of PAPy/MWNTs composites can near that of MWNTs by controlling the mass ratio between APy and MWNTs.
  • Study on two kinds of nano-mesoporous NiO electrochromic films prepared by pulse electrodeposition
    Chen Wang;Wei Wang;Jun-jun Chen
    . 2012, 43(04): 492-495.
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    The electrochromic NiO films were prepared on ITO conductive glass substrate by pulse electrodeposition. The microstructure, morphology and composition of NiO films were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive spectrum. The optical properties of films were measured by UV-visible spectrophotometer. The electrochemical properties of films were analyzed using cyclic voltammetry. The effects of Co addition on the electrochromic properties of NiO films were studied. The results show that Co addition can optimize the surface morphology of NiO films. The homogeneous nano-mesoporous microstructure can be observed on the surface of Co-doped NiO films. Thus, the Co addition can improve the electrochemical activity and enhance the transmission modulation of NiO films.
  • Influences of thermal treatment on photocatalytic property of porous TiO2 films
    Wen-Jie Zhang;Jia-Wei Bai
    . 2012, 43(04): 504-507.
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    Porous TiO2 films were synthesized on glass substrates by octadecylamine (ODA)-associated sol-gel method. The influences of thermal treatment on the physicochemical properties and photocatalytic activity of the films were investigated. With the increase of calcination temperature and time, the pore structures gradually appeared on the surface of the films and grain size grew up at the same time. The films were composed of anatase titanium dioxide crystals and Ti was in its Ti4+ oxidation state. The film thickness was around 200 nm. The UV-Vis transmittance of the films declined with increasing calcination temperature. Meanwhile, the transmittance declined at first with extended calcination time and then increased afterwards. Photocatalytic methyl orange degradation was enhanced on the porous TiO2 films calcinated at higher temperature. The photocatalytic activity of the film calcinated at 500 oC for 2 h represented the optimal value.
  • Foamed Materials from POE/EVA Blends
    Fu-Quan Deng;Jian-Zhong Ma
    . 2012, 43(04): 508-511.
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    Ethylene-octene copolymer (POE) was melt blended with ethylene-vinyl acetate copolymer (EVA) at different composition ratios of EVA/POE. The blends were then melt mixed with foaming agent azodicarbonamide (AC), cross-linking agent dicumyl peroxide (DCP), and talcum powder to prepare foamed materials. The morphology of the foamed materials was investigated by scanning electron microscopy. The physical properties of the foamed materials were tested. The effects of the composition ratio of POE/EVA, and the amount of AC, DCP and talcum powder on the properties of the foamed POE/EVA materials were investigated. The formulation for a highly elastic EVA/POE foamed material was optimized.
  • Kinetic Study on Photocatalysis Degradation of Phenol by Using Tourmaline/ TiO2 System as Catalyst
    Lai-Bao Liu;Yun-Sheng Zhang
    . 2012, 43(04): 512-515.
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    This article used the method of titanium salts on the surface of tourmaline particles hydrolyzing and coating TiO2 to construct mineral with polar electricity and TiO2 system in different conditions. The Catalysis System was characterized by Scanning electron microscopy and Fourier Infrared Absorption spectra, Transmission electron microscopy. This system was getting a titanium dioxide/tourmaline composite functional material which would be used to treat wastewaters containing phenol. The result of rate constant of phenol concentration changing from -0.0012 to -0.0012 shows that the change of phenol concentration has apparent influence on the catalysis efficiency of catalyst, and the rate constant of phenol amount changing from -0.0105 to -0.0051 shows that phenol decomposition conforms to Langmuir-Hinshelwood kinetics equation.
  • Preparation of nanometer CuAl2O4 and photocatalytic generation of H2 in Simulated sunlight
    Yan-Jian Hui;Yan-Ping Yu;Yue-Jin Liu
    . 2012, 43(04): 516-519.
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    Nanometer structured CuAl2O4 was synthetized using co-precipitation method. The effect of different calcination temperatures and amount of catalysts on the catalyst activities was studied using oxalic acid as sacrificial agent under 150W Xenon lamp irradiation. The morphology and structure were characterized using XRD, SEM and TG-DTA, showing that the CuAl2O4 is spinel type structure and with particle size is about 10 nm. The catalyst was also synthesized by solid phase, co-precipitation, and citric acid sol-gel methods, and studied under the same photocatalytic experimental conditions; The experimental results show that the catalyst synthesized by sol-gel method showed the best hydrogen production rate of 41mL/h, followed by that synthesized by co-precipitation method (34mL/h), and that synthesized by the solid phase method (25mL/h).
  • Effect of Doping Na+ on the Structure and Performance of Li3V2(PO4)3/C
    Yun-Fei Long
    . 2012, 43(04): 520-524.
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    Li3-xNaxV2(PO4)3/C(x=0,0.02,0.05,0.08,0.10,0.15) had been synthesized by a simple one-step carbothermal reduction technology. The effects of doping on the crystalline structure, morphology, charge and discharge performances and Li+ deintercalation process were studied by X-ray diffraction, scanning electron microscope, Fourier Transfer Infrared Spectroscopy, cyclic voltammetry，electrochemical impedance spectroscopy and charge-discharge experiments. The results showed that a small amount of Na+ did not affect the basic structure of Li3V2(PO4)3, but it could not only form electronic defects in Li3V2(PO4)3 to improve the degree of the disorder of crystal lattice atoms, but also reduce the polarization and charge transfer resistance, improve the lithium ion diffusion coefficient, so the electrochemical properties of the material were improved. Compared to Li3V2(PO4)3/C, the 50th discharge capacity of Li2.98Na0.02V2(PO4)3/C increased 12.1 mAh?g?1 at 15 C, respectively，exhibiting good rate capability and cycling performance.
  • Research on PEO-PDMS Ionic Liquid Composite Polymer Electrolyte
    Yue-Jiao Li;Feng Wu;Ren-Chao Hu
    . 2012, 43(04): 525-528.
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    A series of PEO-PDMS polymer electrolytes are prepared. The optimum ratio of PDMS is determined according to the result of electrochemical performance tests on PEO-PDMS polymer electrolyte. Then the ionic liquid composite polymer electrolytes are synthesized by adding [BMIM]TFSI or PP13TFSI to PEO-PDMS. The introduce of ionic liquid increases the ionic conductivity of polymer electrolyte significantly. The sample PPP-100% reaches 5.6×10-4S/cm at room temperature. Meanwhile, all samples exhibit good thermal and electrochemical stability. Through comparing, it is found that PP13TFSI composite polymer electrolyte has better performance, and is hopefully to be used as new polymer electrolyte in lithium batteries.
  • Synthesis and photocatalytic property of nitmgen doped Ti02 microspheres
    Sheng-Gang Zhou;Xiao-Hua Sun
    . 2012, 43(04): 529-532.
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    Nitrogen-doped TiO2 microspheres were prepared by solvothermal process in ethanol, hydrochloric acid (HCl) and tetrabutyl titanate (TBT) using the urea as a nitrogen source supplier. Based on XRD, SEM, EDS, XPS, UV-vis techniques we systematically observed the effect of the hydrochloric acid. The results showed urea can be used as a nitrogen source supplier to prepare nitrogen-doped TiO2 microspheres; the addition of hydrochloric acid really influences the character of TiO2 microspheres. When the M(HCl): M(TBT) =2.6:1, the photocatalytic activity is higher than Degussa P25.
  • Preparation of Porous Spherical Hydroxyapatite and Study on its Properties of Drug delivery in Vitro
    Hui Yang
    . 2012, 43(04): 533-536.
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    Abstract: Preparation of porous spherical hydroxyapatite (HAP) and in vitro releasing were investigated in this paper. Porous spherical HAP biomaterials were successfully synthesized by a microemulsion reaction using porous spherical CaCO3 and Na2HPO4 as reactants. The obtained HAP was characterized by scanning electron microscopy (SEM), and X-ray diffraction (XRD).The drug release property of HAP in vitro was also investigated using gentamicin sulfate as a model drug. The results show that porous spherical HAP particles with uniform particle size of about 10μm were well dispersed and its entrapment efficiency and loading efficiency were 46.0％ and l8.0％ respectively. The gentamicin sulfate in HAP was released about 10 days. Porous spherical HAP had favorable drug release behavior in vitro as drug delivery vehicles.
  • Synthesis of nano-TiO2 hierarchically-structured spheres and their formation mechanism
    Wei-Guang Yang;Ya-Li Wang;Wei-Min Shi
    . 2012, 43(04): 541-544.
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    The diethylene glycol (DEG) was use as chelating agent as well as reaction medium to synthesize the titanium diglycolate precursor spheres. And the highly crystallized hierarchically-structured TiO2 spheres were obtained by hydrothermal treatment of the precursors at 180℃. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR) and thermogravimetry-differential scanning calorimetry (TGA-DSC) were used to characterize the precursor and TiO2 spheres. The formation mechanism of the hierarchically-structured TiO2 spheres was also investigated.
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