25 April 2010, Volume 41 Issue 04
    

  • Select all
    |
    研究与开发
  • LU Jianjun;SHI Jun;LIU Miaoqing
    . 2010, 41(04): 558-561.
    Abstract ( ) Knowledge map Save
    A kind of poly(amic acid) (PAA) microparticles was synthesized, with butanone (MEK) and N-methyl-2-pyrrolidone (NMP) as component solvent, from pyromellitic dianhydride (PMDA) and 4,4’-Diaminodiphenyl ether(ODA) by precipitation polymerization in room temperature and 500r/min ratio of mechanical agitation. Infrared (IR) spectrum suggested the success of poly(amic acid) microparticles. SEM analysising in morphology of microparticles showed that poly(amic acid) microparticles size increased with the increasing volume ratio of N-methyl-2-pyrrolidone. When the volume ratio of butanone and N-methyl-2-pyrrolidone was 8:1, the average particle diameter was 5.89μm. Polyimide microparticles were produced by several methods, the chemical structure, the morphology and the thermal properties were analyzed by IR, SEM and TG test.
  • WU Jing;ZHOU Wenfang;GAO Pan
    . 2010, 41(04): 562-565.
    Abstract ( ) Knowledge map Save
    Abstract: The nano-TiO2 doped with Pr was prepared by sol-gel method. The samples were analyzed by X-ray diffraction(XRD), FT-IR, UV-Vis, TEM, et al. The photocatalytic activity of Pr-TiO2 was investigated at different doping dosage and different calcinated temperatures by measuring the degradation rate of methyl blue(MB) under the irradiation of fluorescent lamp. The results show that crystal phase of Pr-TiO2 sample is a mixed phase of anatase and rutile. The existence of the doped element Pr increase the photocatalytic activity of TiO2. Meanwhile, the photocatalytic activity of the sample at the calcinated temperature of 500℃, Pr:TiO2 =1:300(molar ratio) and pH=2.5 is the best, and it is obvious higher than that of P25.
  • LIU Yonglei;LI Hong;LV Guoyu
    . 2010, 41(04): 566-569.
    Abstract ( ) Knowledge map Save
    The nano-hydroxyapatite(n-HA)/poly (amino acid)(PA) composite was prepared by in-situ polymerization. Dispersity of the n-HA and homogeneity of the composite were tested by scanning electron microscope (SEM) and burning test. FT-infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to study the interface of the two components. The results show that the size of n-HA particles is about 80~100nm and well disperse in the composite. The composite prepared by this method has good homogeneity. In addition, there are hydrogen bond and new chemical bonds are found at the interface between the n-HA and PA. It indicates that there is a close-knit combination between n-HA and PA. The prepared composite is stable and could be used as potential biomaterials for bone reconstruction.
  • CHEN Xiaoyan;DONG Faqin;YANG Yushan
    . 2010, 41(04): 570-573.
    Abstract ( ) Knowledge map Save
    In this research, silane coupling agent KH550 modified carbon black(CB), concentrated nitric acid oxidized carbon fiber(CF), electromagnetic shielding composites was prepared using modified carbon black and carbon fiber, acrylonitrile-butadiene-styrene (ABS) resin by melt extrusion, affect of content and modification of carbon black and carbon fiber on electric volume resistivity and shielding effectiveness of composites was studied. The experimental results showed that modifying carbon black using KH550 could achieve modification, carbonyl and carboxyl were bonded on the surface of carbon fiber which was oxidized by concentrated nitric acid. electric volume resistivity of composites gradually declined with the increase of carbon black’s content, and the law accorded with “percolation effect”, shielding effectiveness gradually increased in the frequency range of 100-1800MHz, conductive properties and shielding effectiveness increased after carbon black was modified using 1% KH550. After adding carbon fiber, conductive properties and shielding effectiveness of composites was improved greatly and reached maximum respectively when carbon fiber’s content was 2%, after carbon fiber was oxidized using concentrated nitric acid, conductive properties was improved further, shielding effectiveness increased by 1dB.
  • CHEN Zhiyan;WANG Jun;LI Xiaodong
    . 2010, 41(04): 574-577.
    Abstract ( ) Knowledge map Save
    Abstract: Continuous Fe-containing silicon carbide (SiC(Fe)) fibers were prepared for the first time from a precursor polyferrocarbosilane (PFCS), which was synthesized from polydimethylsilane and ferrocene, followed by melt-spinning, curing in air, and continuous pyrolysis at 1320oC in N2 atmosphere. The structural materials prepared with the fibers and resin show good radar-wave absorbing property in the frequency region of 2 to 18GHz. PFCS was analysized with elemental analysis, IR, NMR, XPS and the other characterizations. As a result, element iron was inducted to the PFCS; The structure of PFCS is established, the backbone of PFCS is made up of -Si-CH2-, with -CH3, -CH2Si, or -H connected to atom Si of the main chains; Ferrocene exists as that the cyclopentadienyl rings connect with atoms Si of the chains, and therefore ferrocene acts as crosslinker of the chains. The continuous SiC(Fe) fibers were composed of free carbon、β-SiC and amorphous SiCxO4-x by HRTEM analysis.
  • WANG Xinpeng;SUN Xiaoyan;JIE Wanqi
    . 2010, 41(04): 578-580.
    Abstract ( ) Knowledge map Save
    Bulk Hg3In2Te6 ingot with diameter of 30mm has been successfully grown through vertical Bridgman (VB) method. The infrared transmittance of crystal wafer cut from different parts of the ingot is measured through Fourier transformation infrared (FT-IR) transmission spectrum, and the crystalline quality of the Hg3In2Te6 is evaluated by means of X-ray rocking curve. The results show that the diffraction peak of (111) oriented wafer is located at θ=12.1665 ° with FWHM of 0.0760°. The average infrared transmittance of Hg3In2Te6 signal crystal in the middle of the ingot reach 50%, which is close to the theoretical value 57% of perfect single crystal. The dislocation and composition non-uniformity are the main reasons that lead to the infrared transmittance discrepancy of difference parts.
  • ZHANG Yanghuan;ZHAO Dongliang;GUO Shihai
    . 2010, 41(04): 581-586.
    Abstract ( ) Knowledge map Save
    In order to improve the hydrogen storage characteristics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by element Cu, and the nanocrystalline Mg2Ni-type Mg20Ni10-xCux (x = 0, 1, 2, 3, 4) alloys were synthesized by melt spinning technique. The microstructures of the as-cast and spun alloys were characterized by XRD, SEM and HRTEM. The hydriding and dehydriding kinetics of the alloys were measured using an automatically controlled Sieverts apparatus. The electrochemical hydrogen storage performances were tested by an automatic galvanostatic system. The results show that all the as-spun alloys hold typical nanocrystalline structure. Cu substitution and melt spinning do not change the major phase Mg2Ni. The hydrogen absorption/desorption capacities and kinetic of the alloys significantly increase with rising spinning rate. Additionally, the melt spinning significantly improves the electrochemical hydrogen storage capacity of the alloys, whereas it slightly impairs the cycle stability of the alloys.
  • SUN Jianfeng;DU Haiyan;SUN Jiayue
    . 2010, 41(04): 587-590.
    Abstract ( ) Knowledge map Save
    Eu2+-doped Alkali earth chlorosilicate phosphor of the types (CaO-CaCl2-SiO2):Eu2+ was synthesized through the high temperature solid state method. Its structure and luminescence properties were investigated by using X-ray diffraction (XRD), excitation and emission spectra. Under the excitation of the near-ultraviolet (UV) light (350-420nm), the (CaO-CaCl2-SiO2):Eu2+ phosphor synthesized at 900oC emits an intense green light peaking at 510nm, whereas the same component phosphor synthesized at 1100oC emits an yellow light peaking at 582nm. In addition, luminescence properties and crystal-lattice environment of Eu2+ in (CaO-CaCl2-SiO2) crystal synthesized at 1100oC were discussed according to the Van Uitert experimental equation and the possibilities of two Eu2+ emission centers, viz, green and yellow centers were confirmed. The mechanisms of concentration quenching in (CaO-CaCl2-SiO2):Eu2+ phosphor were also discussed, which were caused by the energy transfer among the nearest-neighbor ions in this phosphor system.
  • LAI Bin;WANG Huijie;ZHAO Rui
    . 2010, 41(04): 591-593.
    Abstract ( ) Knowledge map Save
    Abstract Full-dense anisotropic magnets are produced from isotropic Nd32FebalBGax (x=0.0,0.2,0.4,0.6,0.8) magnetic powders by hot pressing and subsequent die-upset. Magnetic performance of die-upset magnets with various die-upset temperature and different Ga contents is measured by hysteresis loop tracer. Microstructure of the latter is investigated by scanning electron microscopy (SEM). The effecets of Ga additions on microstructure and magnetic performance of die-upset magnets is discussed. It is found that increased Ga content will refine grains and improve magnetic microstructure. With increasing Ga additions, remanence Br and coercive force Hcj could be both enhanced. When Ga reaches 0.6%, the maximum energy product (BH)max of die-upset magnets reach up to 228.3kJ/m3.
  • HAO Wanli;ZHAO Beijun;PENG Shuming
    . 2010, 41(04): 594-597.
    Abstract ( ) Knowledge map Save
    Amorphous Zirconium Vanadium alloy films with V/Zr=2 were prepared by magnetron sputtering. The phase, surface composition, growth morphology and dynamic mechanical properties of the films were investigated systematically. The results showed that Zirconium Vanadium alloy films deposited at between 533K and 773K consist of amorphous phase. There was a layer of oxidation about 26nm in the surface of the films, and its composition is remarkable different of the body. The growth films on Mo substrate deposited in global island model. With the depositing temperature going up, the dynamic hardness(DHT115) and elastic module Eit/(1-υ2) of the films had maximums at 583K, where the value of DHT115 was 436.8GPa and the value of Eit/(1-υ2)was 1.13E+5N/mm2.
  • DENG Lianwen;HU Zhaowen;LIU Xiuli
    . 2010, 41(04): 601-603.
    Abstract ( ) Knowledge map Save
    Nanocrystalline flakes of Fe-based alloy with Tb doping were synthesized by atomization process, high energy ball milling and sequent annealing. The microwave absorbing coating was made of the Fe-based alloy fillers and polyester. Effect of doping Tb on the microwave complex permeability and permittivity of the synthesized materials was investigated. The microwave electromagnetic properties and absorbing ability were measured and analyzed. Results show that the microwave permeability characteristics of the studied materials is adjusted effectively and better performance of alloys with higher permeability and loss is presented at a suitable Tb content. and attain 6.1and 4.3 respectively. The coating of 1mm thickness made of the Fe-based alloy flakes presents favorable absorbing performance (lower than -4.5 dB) in the frequency range of 2~18 GHz. These materials can be applied in the field of anti-electromagnetic interfere and stealthy technology.
  • REN Guoqiang;TANG Zhanghong;GUO Hongxia
    . 2010, 41(04): 604-606.
    Abstract ( ) Knowledge map Save
    The particles of Fe3N and Fe4N were synthesized by the solid-gas reaction method. The effects of process parameters on the products such as the ratio of NH3/H2, the reaction temperature and the holding time of reaction temperature were investigated. The pure Fe3N and Fe4N compounds in particle form were obtained basing on the investigation. The permeability and permittivity of Fe3N and Fe4N were measured by Vector network analyzer. Comparison results show that when the frequency ranges from 1 MHz to 1 GHz,the permeability of Fe3N and Fe4N is lower than that of ferrite, but the permittivity is higher than that of ferrite, and the electromagnetic characteristics of Fe4N are better than that of Fe3N.
  • WU Menghua;XUE Jinhai;WU Hao
    . 2010, 41(04): 607-609.
    Abstract ( ) Knowledge map Save
    Nano Ni- TiN composite layers were prepared by ultrasonic-electrodeposited technology. The hardness and wear-resistant capacity of nano Ni-TiN composite coating at various heat treatment temperatures were tested. Wear resistance of composite coating was analysised. The results showed that the hardness of nano Ni-TiN coating decreased with the heat treatment temperature increase; wear resistance of coating reached the miximum at 300℃ and the wear-resistant capacity was 13.5mg. Friction coefficient of composite coating has samll increased with the heat treatment temperature increased.
  • XIONG Lizhi;HU Qinghua;LIANG Kai
    . 2010, 41(04): 610-612.
    Abstract ( ) Knowledge map Save
    The layered LiNi1/3Co1/3Mn1/3O2 cathode material for Li-ion batteries was synthesized by high-temperature solid-state method. The microstructure, surface morphology and electrochemical properties were characterized by various electrochemical methods in combination with X-ray diffraction (XRD) and scanning electron microscope (SEM).Results show that LiNi1/3Co1/3Mn1/3O2 with good Crystallization can be obtained by high-temperature solid-state method. However, two-step sintering helps to increase the value of I(003)/ I(104)and decrease the value of Lattice parameters c/a, resulting in perfect layer structure and good electrochemical performances of LiNi1/3Co1/3Mn1/3O2.
  • YAO Jinguang;YAN Hua;WANG Xuemei
    . 2010, 41(04): 613-615.
    Abstract ( ) Knowledge map Save
    effects of rotate speed on magnetorheological fluid viscosity、sedimentation stability and rheological property are investigated during its preparation under taking carbonyl iron particle and silicone oil as dispersed phase and continuous phase separately while adopting the method of using high performance ball mill to disperse. The research showed that rotate speed greatly influenced the magnetorheological fluid performance. With constant increasing of rotate speed, the fluids viscosity presented decreasing first and then increasing trend, when rotate speed reached 300rpm, the obtained viscosity was lowest. There was a good corresponding relation between its sedimentation stability and viscosity that meant fluids with strong viscosity sedimentate lowly and fluids with weak viscosity sedimentate quickly. When rotate speed was 400rpm, it could get best sedimentation stability and highest shear stress. Therefore, basing on the fixed composition of magnetorheological fluid, the fluids viscosity、sedimentation stability and rheological property can be changed by changing ball mill rotate speed during magnetorheological fluid preparation.
  • XU Hang;WANG Jianxu;WANG Jinfu
    . 2010, 41(04): 616-619.
    Abstract ( ) Knowledge map Save
    Nano-ZnO powders were prepared through solid state method at room temperature, using Na2C2O4 and ZnSO4?7H2O as raw materials. Reactive Black 5 (RB 5) was used as modeling pollutant decomposed by UV/ZnO. The results show that ZnO particle size was around 30nm. The photo catalytic process followed the pseudo first order kinetics and the optimum ZnO loading is 0.3 g L-1. The surface reaction rate constant (k0) and adsorption equilibrium ( ) of ZnO catalyst are 0.0163 min-1 and 9.42 L?g-1, respectively. UV/ZnO/H2O2 and UV/ZnO/Fenton process are not followed pseudo first order kinetics. A hyperbolic model can be established and suits for the UV/ZnO/H2O2 and UV/ZnO/Fenton process.
  • XU Hongliang;WANG Meng;LIU Qinfu
    . 2010, 41(04): 620-622.
    Abstract ( ) Knowledge map Save
    Kaolin/dimethylsulphoxide intercalation complex were successfully prepared by using kaolin from coal measures as the main raw material and dimethylsulphoxide (DMSO) as the intercalation agent. XRD, FT-IR and DSC-TG were used to investigate the intercalation complex. It is revealed that DMSO molecule intercalated successfully into the interlayer of kaolinite, and formed new hydrogen bonds with the inner surface hydroxyls of kaolinite. Thus led to the basal spacing of kaolinite increased from 0.714 nm to 1.121 nm, and the dehydroxylation temperature of kaolinite decreased from 541 oC to 523 oC. The deintercalation of DMSO molecule from the kaolin/DMSO intercalation complex occurred at 197 oC.
  • HE Zhirong;CAI Jifeng;LIU Manqian
    . 2010, 41(04): 623-626.
    Abstract ( ) Knowledge map Save
    The effects of Co microalloying and annealing technology on the transformation, microstructure and shape memory effect (SME) of Ti-Ni shape memory alloy were investigated by differential scanning calorimetry, optical microscopy, X-ray diffraction and tensile test for Ti-49.8Ni and Ti-49.8Ni-1.0Co alloys annealed at 400℃ and 600℃, respectively. The results are described as follows. The A→R→M (A-parent phase, R-R phase, M-martensite) two-stage transformations takes place in Ti-49.8Ni and Ti-49.8Ni-1.0Co alloys during cooling from 400℃ annealing, while during heating the M→A one stage and M→R→A two-stage transformations takes place in Ti-49.8Ni and Ti-49.8Ni-1.0Co alloys, respectively. The 400℃ annealed Ti-49.8Ni and Ti-49.8Ni-1.0Co alloys show fiber microstructure and poor plasticity, and the 600℃ annealed alloys shown equiaxed grains and good plasticity. Since Ti-49.8Ni alloy at room temperature consist of a single martensite, the alloy exhibits SEM, while Ti-49.8Ni-1.0Co alloy consist of a single parent phase B2, and thus shows superelasticity (SE). The effect of the annealing time on microstructure and properties of Ti-Ni alloy is not obvious. The transformation temperature of the Ti-Ni alloy increases slowly with increasing annealing time. The deforming temperature obviously affects the SE of Ti-Ni alloy. The SE stress increases and the SE loop area decreases in Ti-Ni alloys with increasing deformation temperature.
  • FENG Qiming;DONG Faqin;WANG Weiqing
    . 2010, 41(04): 627-629.
    Abstract ( ) Knowledge map Save
    Moisture and fertilizer retaining agent was prepared by solution polymerization method, and the properties of retaining moisture and fertility were studied. The research results show the optimum preparation conditions are as follows: the amount of cross-linking agent, bentonite and initiator accounting of the monomer mass is 0.05%, 15%, 0.45%, respectively. The reaction temperature is 75 ℃; the neutralization degree is 90%. Moisture and fertilizer retaining agent absorbing distilled water rate is 796 g/g, water evaporation quantity is less than 9% at room temperature in 24 hours, and water evaporation quantity is 99.72% in 60 ℃ water bath in 10 hours. The water-retention rate is 57.4% at the centrifugation speed of 4000 r/min in 10 min;the adsorption rate is 500 g/g to urea solution which concentration is 10.0 g/L, To 0.1 g water- retaining agent which adsorbed urea solution which concentration is 20%, the residual urea is 31.78% after wash with 50 mL distilled water in dynamic leaching.
  • YUAN Xin;ZHAO Jianfeng
    . 2010, 41(04): 630-631.
    Abstract ( ) Knowledge map Save
    The experiments of in-situ growth of the SiC whiskers by laser irradiation on SiC nano-particles coated with and without binder were performed. The microstructure and phase structure of SiC whiskers were analyzed by means of the Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). The results show that the SiC whiskers are grown in these specimens with the certain process parameters, but their morphology are different. The quantity of SiC whiskers in specimens with the binder is much more than that of the specimens without binder. The XRD result shows that the binder dose not effect the phase structure of SiC whiskers.
  • GUAN Xinchun;HUANG Yonghu;GAO Jiuwang
    . 2010, 41(04): 632-636.
    Abstract ( ) Knowledge map Save
    The evaluation indicator of thixotropy of magnetorheological (MR) fluid was studied by experiment. Experimental results show that, the thixotropic crack index which got from the relationship between apparent viscosity and shear rate has better testability and repeatability, and can be used as evaluation indicator of thixotropy of MR fluid. And as its test results also have good stability and possessing lots of performance information of MR fluid, thixotropic loop can also be used as evaluation indicator of thixotropy. Moreover, lower shear rate and shorter duration are apt to get distinct thixotropic loop.
  • ZHANG Wenjie;WANG Kuanling;YU Yang
    . 2010, 41(04): 637-640.
    Abstract ( ) Knowledge map Save
    HZSM-5 supported TiO2 photocatalysts(TiO2/HZSM-5) were prepared by a sol-gel method from Ti(OBu)4. The photocatalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy analysis. The results indicated that HZSM-5 could improve the dispersion of TiO2, decrease the aggregation size, and inhibit the phase transformation of TiO2 from anatase to rutile. Ti-O-Si bonds were not formed between the HZSM-5 bulk and the supported TiO2. The titanium was in the oxidation state of Ti4+, and the oxygen was in the form of O2- in TiO2 and also in SiO2. The photocatalytic activity was investigated by using methyl orange degradation under UV irradiation. The results showed that TiO2/HZSM-5 photocatalyst with a suitable TiO2 content exhibited higher activity than pure TiO2. The optimum photocatalytic activity for the samples with 30% TiO2 was obtained after being calcinated at 400oC for 2h.
  • XIA Tongchi;LI Xiaofeng;DONG Huichao
    . 2010, 41(04): 641-643.
    Abstract ( ) Knowledge map Save
    Barium ferrite is prepared by high-temperature solid reaction process in this paper. The structure and morphology of the products are characterized by using X-ray diffraction (XRD) and scanning electronic microscope (SEM). The electrochemical properties of the barium ferrite electrodes are studied by using cyclic voltammetry and galvanostatic charge-discharge tests. The results show that for the second alkaline battery with BaFe2O4 as the positive material and hydrogen absorbing alloy as the negative material, it has good electrochemical activities and a stable discharge platform at above 1.2V. The reactant ratio has a great effect on the structure and electrochemical properties of the products and the optimal process is as follows: ratio between Fe2O3 and Ba(OH)2 1: 1.5, temperature 900 oC and reaction time 10 h.
  • ZHANG Weihong;FAN Xiaodong;FAN Weiwei
    . 2010, 41(04): 644-647.
    Abstract ( ) Knowledge map Save
    Abstract Nano-SiO2 ,which were synthetized via improved St?ber method, were endowed with amphiphilic surface by means of surface modification with long chain alkyl silane coupling agent.Stable Pickering emulsion was fabricated using this amphipathic nano-SiO2 particles as stabilizer. The SiO2/polystyrene composite microspheres with hollow structure were successfully synthetized through adjusting the ratio between styrene monomer and n-octane. The products were characterized by fourier transformation infrared spectrum (FTIR), gel permeation chromatography coupled with a multi angle laser light scattering photometer (GPC-MALLS),thermogravimetic analysis (TGA),scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A possible mechanism for the formation of the hollow composites by Pickering emulsion polymerization was proposed at last.
  • MA Ying;LIU Pengtao;LIU Zhong
    . 2010, 41(04): 648-651.
    Abstract ( ) Knowledge map Save
    To prepare good water-solubility N, O-Carboxymethyl chitosan (N, O-CMCS), chitosan was modified with monochloroacetic acid in the presence of sodium hydroxide. The structure of N, O-CMCS was characterized by FT IR, and it was proved that substitution reaction both occurred on the N element and O element. The DS and its antibacterial activity were studied. The preparation method (addition in pulp and insufflation) of N, O-CMCS antibacterial paper was also taken into consideration, and the antibacterial activity of the prepared paper was tested.
  • LIU Haohuai;ZHANG Li;ZOU Qin
    . 2010, 41(04): 652-655.
    Abstract ( ) Knowledge map Save
    Damage to articular cartilage is one of the most common diseases in clinic, and may lead to the development of osteoarthritis because this tissue has poor regenerative capacity. Therefore, exploring a suitable osteochondral substitute transplanting graft is of great importance. The aim of the present work was to make a bilayered construct by integrating a tissue-engineered cartilage into an underlying bony substrate in order to solve the integration problem of cartilage and subchondral bone. The cartilage material was polyurethane and the underlying bony substrate was hydroxyapatite/polyurethane composite scaffold, and the same material, that is polyurethane, used in both structures integrated two layers together and made the conglutination more firmly. The subchondral part of the bilayered construct had an interconnected porous structure with a porosity of 83% and pore size ranging from 200μm to 600μm. In vitro biocompatibility tests showed that the incorporated bilayered construct provided a favorable environment for initial cell adhesion, and maintained cell viability and cell proliferation. The results suggest that the bilayer material has the potential for further application in osteochondral tissue engineering.
  • WEI Zhiyong;LIU Lian;QU Chao
    . 2010, 41(04): 656-658.
    Abstract ( ) Knowledge map Save
    Poly(L-lactic acid-co-α-alanine) copolymer, one of biodegradable poly(ester-amide) derived from L-lactic acid and α-alanine, was synthesized by direct melting copolymerization with stannous chloride and p-toluenesulfonic acid as the catalyst. The structure and properties of the obtained copolymers were measured via FT-IR, 13C NMR, GPC, DSC and XRD. With increasing of the content of α-alanine in feed, the data of copolymer molecular weight decreases, the diffraction and the melting peak disappear markedly, respectively. The hydrolytic degradation test indicated the resulting copolymer has an excellent degradability; its degradation rate could be enhanced by incorporating more α-phenylalanine into copolymer chain. It is suggested that the obtained copolymer is a potential biomedical material as drug coating on cardiovascular stent.
  • ZHONG Yiye;LIU Huaran;ZHANG Xin
    . 2010, 41(04): 659-661.
    Abstract ( ) Knowledge map Save
    Electrochromism (EC) can be defined as a persistent but reversible optical transformation induced by electrochemical processes. NiOx films are found in the best performance of the electrochromic material one. In this article, NiOx films were prepared by Nickel metal as a target, in Nitrogen and oxygen gas mixture with reactive magnetron R.F. sputtering. We studied the electrochromic process of NiOx films by cyclic voltammeter, and X-ray results its structure. Key words: Electrochromics; R.F.sputtering; NiOx thin film; X-ray
  • ZHAO Yan;ZHANG Wengong;LIN Bingli
    . 2010, 41(04): 662-665.
    Abstract ( ) Knowledge map Save
    The conductive polyanline doped with instu decorating nano-silica was continue prepared by pulsed laser ablation,the polyaniline/nano-silica hybrid film was characterized by four probe stander conductivity test,TEM,UV-vis,TG,XRD,XPS.discussing the thermal and conductivity of hybrid films was affect by different content of nano-silica.Get the conclusion that:nano silica prepared by laser ablation have a small size ,not aggregating, and well disperseing in the hybrid.there is strong interaction between nano-silica and polyaniline,which have destroyed the order of polyaniline molecular chain and decreased the concentration and the mobility rate of carrier.Decreasing the conductivity;but get a more well oxidation resisitance.
  • CHENG Song;ZHONG Cuihong;ZHOU Changren
    . 2010, 41(04): 666-670.
    Abstract ( ) Knowledge map Save
    In this paper, hydroxyethyl chitosan (HECS) was prepared firstly by the reaction of chitosan and 2-chloroethanol. Then, the hydroxyethyl chitosan-graft-poly(D,L-lactide) (HECS-g-PDLLA) and chitosan-graft-poly(D,L-lactide) (CS-g-PDLLA) copolymers were synthesized by the bulk ring-opening polymerization of D,L-lactide onto HECS and CS respectively in the presence of tin(II) 2-ethylhexanoate catalyst. The prepared copolymers were characterized by FTIR, 1H-NMR, TGA, XRD and solubility. The results showed that the reaction activity of HECS obviously higher than that of CS, with the feeding ratio of n(D,L-LA):n(aminoglucoside) increased from 10:1 to 40:1, the grafting percentage of CS-g-PDLLA and HECS-g-PDLLA increased from 24.01% to 114.85% and from 77.42% to 380.51% respectively, and the average degree of polymerization of poly(D,L-lactide) branch chains in the two copolymers just mentioned above also rose from 0.61 to 2.48 and from 2.51 to 12.31 respectively. The feeding ratio of n(D,L-LA):n(aminoglucoside) had a strong influence on the structure and property of the graft copolymers, higher n(D,L-LA):n(aminoglucoside) feeding ratio led to copolymer with higher average degree of polymerization of poly(D,L-lactide) branch chains, and lower crystallinity and less thermal stability. The solubility of HECS-g-PDLLA was superior to that of CS-g-PDLLA in some organic solvents.
  • ZHANG Hailong;YANG Fengyuan;LI Changqing
    . 2010, 41(04): 671-673.
    Abstract ( ) Knowledge map Save
    The PAN/CNT composite solution was synthesized by in situ polymerization and the PAN/CNT composite fiber were prepared by wet spinning method. The effects of CNTs on the crystal structure and mechanical properties of PAN precursor was characterized by X-ray diffraction, scanning electron microscope and filament tensile tester. The results showed that the intensity ratio of two asymmetrical peak increase from 1.054 to 1.258 with the preparing of PAN/CNT composite fiber in the azimuthal scan. The degree of crystallization of PAN/CNT composite fiber is 53.10%, which is larger than that of PAN fiber(51.89%). In the equatorial scans, the 200 interplanar crystal in the PAN/CNT composite fiber is more clearer than in the PAN fiber, the crystal size of which is larger than the PAN fiber. The cross section of PAN/CNT composite fiber has more micro-fiber structure than the PAN fiber, which make the composite fiber having higher tensile modulus.
  • LI Xinlu;DU Kun;ZHANG Yuxin
    . 2010, 41(04): 674-676.
    Abstract ( ) Knowledge map Save
    In view of rich source and high capacity, natural microcrystalline graphite were treated by particle grading and surface coating in order to improve the initial cycle efficiency, reversible capacity and cycle life as an anode material for lithium ion battery. The experiments results proved that the first cycle efficiency of microcrystalline graphite was increased to be 90% and cycle stability was also improved after particle grading and surface coating.
  • DENG Shiping;TANG Guangming;ZHAO Yan
    . 2010, 41(04): 677-679.
    Abstract ( ) Knowledge map Save
    This paper studies a new low-expansion alloy Fe-33Ni-4Co-1.2Nb for radome link purpose. The alloy have very low expansion coefficient(α20~100℃<0.9×10-6/℃). At the same time, The alloy have Good mechanical properties and Processing performance. The results indicated that The alloy have fairly resolved the joining problems about radome and body. alloy Fe-33Ni-4Co-1.2Nb is a fine joining materials to manufacture radome link and sealing.
  • WANG Shulan;ZHAO Dan;YAO Guangchun
    . 2010, 41(04): 680-682.
    Abstract ( ) Knowledge map Save
    NiFe2O4 was prepared by solid synthetics from NiO and Fe2O3 with 0.5%wt TiO2 and 1%wt MnO2 as additives at 1173 and 1273K, and XRD and SEM were used to characteristize the product. The relationships between the strength of the characteristic diffraction peak of NiFe2O4 and time have been established. Without additive, the synthetic velocity of NiFe2O4 didn’t increase as increasing sintering temperature. With 0.5% wt TiO2 as additive, the synthetic velocity increases as elevating temperature. In case that 1%wt MnO2 as additive, the synthetic velocity of NiFe2O4 is increased greatly. The SEM analysis also shows the addition of both TiO2 and MnO2 improved the density of the solid sample and the function of MnO2 is better than that of TiO2. The kinetic data is processed by zero order kinetic equation and the rate coefficient of synthesis of NiFe2O4 was calculated.
  • YANG Mei;LIU Qingcai;XUE Qi
    . 2010, 41(04): 683-686.
    Abstract ( ) Knowledge map Save
    The V2O5-WO3/TiO2 catalyst was prepared,supported on honeycomb cordierite by chemical vapor deposition(CVD) and impregnation, the microstructure and component of TiO2 carrier and catalyst were characterized by means of SEM, BET,XRD and EDS. Its NO removal rate(ηNO/%)was tested by performance evaluation set-up. The results show that, the main phase of TiO2 carrier made by CVD is anatase TiO2,which is agglomerate. The BET surface area of TiO2 carrier is 62.73m2/g, and its average pore diameter is 9.8nm.The pore structure of V2O5-WO3/TiO2 catalyst is similar to TiO2 carrier. TheV2O5 exists in the amorphous state and is monolayer dispersion on TiO2 carrier. A small proportion of V2O5 is acicular in the micro-district and the width dimension is less than 100 nm . NO removal rate(ηNO/%)of V2O5-WO3/TiO2 catalyst is up to 96.7% at 350℃,SV=4000h-1,nNH3 / nNO =1.
  • CHEN Jinjun;CAO Ling;SONG Xueping
    . 2010, 41(04): 687-689.
    Abstract ( ) Knowledge map Save
    Tantalum-doped zinc oxides transparent conducting films prepared by RF magnetron sputtering on silicon substrates at room temperature and annealed at different temperatures are characterized and analyzed by AFM and XPS. The morphological properties of Ta-ZnO films influenced by the Ta2O5 content and annealing temperature are studied. The maximum average grain size 94.46 nm and the minimum surface roughness 4.48 nm can be obtained for the Ta-ZnO film with the Ta2O5 content of 5 wt.%, the surface roughness of this film first increases and then decreases with increasing of the annealing temperature from room temperature to 500 ℃ and the average grain size is in the range of 94.46 to 118.05 nm.。
  • GUA Yadong;YAN Hui;XIA Yuhong
    . 2010, 41(04): 690-693.
    Abstract ( ) Knowledge map Save
    Ideal filtration materials for liquid and solid generally are composed of several filtrations with different filtration properties, which have great capability of holding up floating dusts and long lifetime. As a kind of isotropic elastic material with multi-pores, metal rubber is suitable for preparing all kinds of filter due to its’ super performance. Multi-pass, method evaluating filtration performance based on ISO16889-1999, is used to study and compare the filtration performance of composed metal rubber filtration with different structure parameters and integrated metal rubber filtration. Results show that the former filtration characteristics are outstanding than the later. At the same filtration efficiency, composed filtration material shows lower pressure drop and better flow-passing performance. Because of the capability of holding more contamination before limited pressure drop, filtration material prolongs it’s lifetime and fully exerts it’s filtration performance.
  • CHEN Jie;WANG Jun
    . 2010, 41(04): 694-696.
    Abstract ( ) Knowledge map Save
    Pure and Al doped ZnO thin films were fabricated on the glass substrates by sol-gel method. X-ray diffraction (XRD)、Scanning electron microcopy (SEM)、Ultraviolet-Visible Spectrophotometer (UV-VIS)、Photoluminescence (PL) were employed to analyse the effects of surface topograph and optical properties induced by the different densities of Al doping. The results show that the preferential orientation of crystal growing changes when Al doping. The surface granule of ZnO film becomes large with the increasing of Al doping. And the average optical transmittance is over 78% in the visible range. The analyse of PL shows that the pure ZnO film have a strong property of Ultraviolet emission, but when the fraction of Al doping increases, the strength of Ultraviolet emission decreases rapidly.
  • LIU Xuguang;WANG Yingde;WANG Lei
    . 2010, 41(04): 697-699.
    Abstract ( ) Knowledge map Save
    Trilobal, swirl-shaped and T-shaped SiC fibers were prepared from precursor polymer. XRD spectrum was carried out, and the electromagnetic properties of trifoliate SiC fibers were studied by network analyzer. These SiC fibers have same XRD pattern, while the permittivity of fibers have much difference. Through computing, it can be known these three SiC fibers have different capability of microwave-absorbing.
  • LI Zhihong;HUANG Shujie;WU Jimin
    . 2010, 41(04): 700-703.
    Abstract ( ) Knowledge map Save
    HA and bone mineral are somewhat different in composition and degree of crystallinity. Bone mineral is typically calcium deficient and contains carbonate substitutions. Other ions present in bone mineral include magnesium (Mg2+), Strontium(Sr2+),sodium (Na+), potassium (K+), and fluoride (F-) ions. To meet the requirements for clinical applications, some elements are substituted into the apatite to improve its function. Magnesium-substituted hydroxyapatite (Mg-HA) is one of these modification materials. Magnesium-substituted HA powders were prepared by the hydrothermal method at 180℃ for 8 h using Ca(NO3)2, (NH4)2HPO4 and Mg(NO3)2 as reagents. X-ray diffraction, Fourier transform infrared spectroscopy, Transmission electron microscope, Energy dispersive X-ray, and Thermogravimetric-differential thermal analysis were used to characterize the crystalline phase, chemical composition, morphology, and thermal stability of the Mg-HA. And MTT assay was used to detect the cytotoxicity of Mg-HA. The results show that Mg is incorporated into the HA crystal structure. The crystal grain size of the Mg-HA decreased when the Mg content was increased. The apatites thermal stability decreased because of the Mg addition. There’s no apparent difference between the pure hydroxyapatite and all of the Mg-HA groups. Mg-HA bioceramics have no obvious cytotoxicity and may have good biocompatibility.
  • LUO zijiang;ZHOU Xun;YANG Zairong
    . 2010, 41(04): 704-708.
    Abstract ( ) Knowledge map Save
    The uses of RHEED and MBE have been proved to be a powerful tool to understand growth mechanism and surface reconstruction of GaAs. This paper reported a new type method of molecular beam epitaxy. GaAs epilayer was grown on GaAs (001) substrate under the real-time monitoring of RHEED. By changing the growth and annealing time and temperature (480 ℃, 560 ℃, 610 ℃), combining the evolution of RHEED images with the relationship of GaAs surface roughness, a smooth GaAs surface at atomic scale has been obtained. After the growth, the sample was analyzed by EDS to show that the sample was high-purity GaAs, the thickness of GaAs epilayer was about 4μm.
  • WANG Lijiu;MENG Duo
    . 2010, 41(04): 709-712.
    Abstract ( ) Knowledge map Save
    A kind of composite shape-stabilized phase change material (SSPCM) based on lauric acid -myristic acid eutectic as the core material, poly methyl methacrylate as the polymer matrix and azobisisobutyronitrile as the initiator were prepared by self-polymerization method. The surface morphology evidenced by SEM shows that fatty acid were coated by PMMA and dispersed evenly in the composite material. POM analysis results convinces that PMMA has immobilized the melted fatty acid and thus prevent the leakage of the liquid fatty acid. The compatibility between fatty acid and PMMA, thermal properties and thermal stability of the fatty acid/PMMA SSPCM were investigated by Fourier-transform infrared (FT-IR), differential scanning calorimetry (DSC) and thermogravimetric (TG), respectively. The results indicate that fatty acid and PMMA has no chemical reaction and exhibits good compatibility with each other. The prepared fatty acid/PMMA SSPCM keep the excellent thermal energy storage performances with proper phase change temperature and high latent heat, and has better resistance to the high temperature than the pure fatty acid.It can be concluded that this kind of fatty acid/PMMA SSPCM with the advantages of no seakage of liquid, low cost and simple process has potential values in solar application for building energy conservation.
  • ZHANG Shiqing;WANG Hong;NIE Zunyu
    . 2010, 41(04): 713-715.
    Abstract ( ) Knowledge map Save
    Abstract: The mean Elastic Limitб0.005 of studing copper alloy can reach 1062MPa by controlling new style Cu-Ni-Cr-Al alloy’s Ingredient Composition, in addition, Elastic stability of both one hour and hundred hours respectively reach 99.6% and 99.2%.The components made by new style copperalloy are of good consistency curve between force and displacement, meanwhile,checked well about Elastic stability after long- term.
  • LIU Li;CUI Wenquan;LIANG Yinghua
    . 2010, 41(04): 716-718.
    Abstract ( ) Knowledge map Save
  • SHI Wei;PEI Ying;WEI Jianshuai
    . 2010, 41(04): 719-721.
    Abstract ( ) Knowledge map Save
    The (1-x)BiYbO3-xPbTiO3(x=0.95,0.90,0.85,BYPTx) ceramics were prepared by traditional solid state processing with solid metal oxides. XRD shown stable peroviskite phase with the solid solution limit is less than 15% (content of BY ). With the increasing of x, the tetragonality of BYPTx increased. BSYPTx ceramics showed the weak piezoelectric coefficient d33 were 23pC/N, and the Curie temperature of BYPTx ceramics was 583℃.
  • ZHANG Xianchun;LIN Yan;ZHUO Linhai
    . 2010, 41(04): 722-725.
    Abstract ( ) Knowledge map Save
    Water-soluble, photoluminescent ZnSe and CdSe nanorods(NRs) were directly synthesized in aqueous media at low temperature. The as-synthesized ZnSe nanorods were 20-30nm in diameter and 60-70nm in length. The as-synthesized CdSe nanorods were 30-60 nm in diameter and 150-450 nm in length. The products were characterized by means of X-ray diffraction (XRD), transimission electron microscopy (TEM), high-resolution transimission electron microscopy (HRTEM), photoluminescence. The results of XRD and HRTEM showed that the as-prepared nanorods had high crystallinity and cubic structure. The detailed formation mechanism and the effect of pH value on the photoluminescence (PL) intensity were also discussed. These nanorods were functionalized on their surface with carboxylic group and amino group and photoluminescence was stable for half a year at least, suggesting possible biological applications.
  • ZHANG Peixin;LIN Muchong;ZHANG Dongyun
    . 2010, 41(04): 726-729.
    Abstract ( ) Knowledge map Save
    Zr4+-doped cathode materials Li1-xZrxFePO4 (x=0,0.005, 0.01, 0.02, 0.03, 0.04) were prepared by high temperature solid phase method. The structure, morphology, electrochemical performance and micro-defects of the materials were investigated by using the technique of X-ray diffraction(XRD),scanning electron microscope(SEM), constant current charge-discharge, AC impedance (ACI) and positron annihilation lifetime spectrum(PALS). The results showed that all samples had the same solely olivine structure, and the morphology and particle size had little changes; additionally, Li0.99Zr0.01FePO4 exhibited the best electrochemical performances at 0.1C discharge rate among all the samples, its first specific capacity of discharge was up to 141.6mAh/g, which was much higher than that of pure LiFePO4 (107.4mAh/g); and after 30 charge/discharge cycles, the capacity retention rates of Li0.99Zr0.01FePO4 was measured as 75.8%.Finaly,the research of AC impedance spectroscopy showed that the impedance of charge transfer reaction had been de decreased greatly due to doped Zr4+ while lithium ion embedded into the cathode material; and positron annihilation lifetime spectrum showed that the internal crystal lattice could cause vacant defect because of doping Zr4+,so that the Positron annihilation lifetime would be increased, and the electrical conductivity of materials would be improved.
  • LI Chunyan;CHU Duanyan;SHAN Li
    . 2010, 41(04): 730-733.
    Abstract ( ) Knowledge map Save
    Polyurethane prodrug(CFPU), was synthesized via polyurethane condensation reaction, with polycarprolactone(PCL) as soft-segment,1,6-hexane diisocyanate(HDI) as hard-segment and an antibiotics drug, ciprofloxacin(CF). The structure of CFPU was characterized by UV, FTIR, H-NMR, the molecular weight was determined through the method of GPC, the drug-loading rate was determined by UV. The influence factors of molecular weight and drug-loading rate were studied. The antibacterial activity of prodrug degradation solution to Staphylococcus aureus, degraded by cholesterol esterase (CE), was determined by agar dilution. The result suggested that polymer prodrug had been successfully synthesized by incorporating ciprofloxacin into polyurethane. The concentration of PCL has great effect on the average molecular weight of CFPU, while the feeding way of HDI has great effect on the drug-loading rate. CFPU degradation solution has shown an ability to kill Staphylococcus aureus. CFPU coated within the medical material implants, it can be controlled degraded by CE, which produced by inflammation, can reach the effect of anti-infection.
  • HAO Ruiting;SHEN Lanxian;DENG Shukang
    . 2010, 41(04): 734-736.
    Abstract ( ) Knowledge map Save
    GaSb thin films were grown on GaAs(001) substrates by Molecular Beam Epitaxy (MBE). The crystalline quality, electrical properties and optical properties were studied by high resolution transition electron microscopy (HRTEM), atomic force microscopy (AFM), Hall measurement and low temperature photoluminescence spectra (LTPL), respectively. It was found that the GaSb films directly grown on GaAs substrates have smooth surface and high hole mobility. It was also found that the AlSb/GaSb superlattices (SLs) can restrict the dislocations into GaSb layers. The intensity of PL spectra of GaSb layer became bigger homologous, which indicated that the optical qualities of GaSb films was improved.
  • ZHAO Qing;YU Shuili;LV Hui
    . 2010, 41(04): 737-740.
    Abstract ( ) Knowledge map Save
    Polyvinylidene fluoride (PVDF) membrane modified by Al2O3/TiO2 composite nanoparticles was prepared via blending method for the improvements of hydrophilicity and antifouling performance. Pure water flux, rejection ratio and contact angle of membrane surface were measured to investigate the permeation, the separability and the hydrophilicity of the hybrid membrane. Detailed observation over membrane surface and cross-section were observed by scanning electronic microscopy (SEM). Fourier Transform Infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were employed to invest the chemical structure and the crystallization degree of the membrane, respectively. The membrane antifouling performance analysis was also carried out. The results indicated that modification improved the flux, hydrophilicity and antifouling ability of the PVDF membrane.