15 June 2013, Volume 44 Issue 11
    

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    综述·进展
  • Progress in the research on chitosan for tissue engineering
    YANG Jiu-lin;XIE Hong-guo;YU Wei-ting;MA Xiao-jun;ZHANG Yu-cang
    . 2013, 44(11): 1521-1525.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Chitosan has been widely used as tissue engineering biomaterials for its low cytotoxicity, biodegradability and biological effect. This article reviews the applications of chitosan in cartilage tissue, bone tissue, skin tissue and other biomedical aspects. Particularly, this article summarized and analyzed the immunological responses induced by the residue protein in chitosan when chitosan materials implanted in body. Besides, the progress and current situation of residue protein determination in chitosan and chitosan purification were described. It was also proposed that preparation of chitosan with high purity is important to promote the application of chitosan in the field of tissue engineering.
    • 研究·开发
  • Study on Natural Aging Properties of Bamboo Fibers / Polylactic Acid Composites
    LI Xin-gong;ZHENG Xia;WU Yi-qiang;CHEN Wei-min;LING Qi-fei
    . 2013, 44(11): 1526-1530.
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    The interface of bamboo fiber(BF)/polylactic acid(PLA) composites was regulated by hydroxide and isocyanate, BF/PLA composites was prepared by injection molding process. Natural aging properties of BF/PLA composites was studied by the methods of fourier transform infrared spectroscopy, X-ray diffraction, gel permeation chromatography and scanning electron microscopy. The results showed that with the synergistic effect of the water, light, heat and oxygen, the PLA molecules in the composites were continuously hydrolyzed, the molecular chains were fractured, the molecular weight was decreased, the certain crystalline state of PLA was gradually transformed into the amorphous state, the degree of crystallinity was reduced, PLA strength was decreased, the bond strength between PLA and BF was continuously decreased, the bonding interface between the two materials was destroyed, the mass of composites reduced and the mechanical properties of composites decreased in the process of natural aging. There are obviously cracks in the surface of composites, and the tensile strength and impact strength were reduced by 69.6% and 75.8% after aging for 137 days. The natural aging of BF/PLA composites was serious and need to adopt certain technical means to further improve the composites outdoor use performance.
  • Thermal Performances of Acrylonitrile/ Acrylamide Copolymers
    WANG Yong-wei;ZHU Bo;CAO Wei-wei;JIANG Xin-bin;WANG Xi-hai
    . 2013, 44(11): 1531-1534.
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    Polyacrylonitrile was synthesized using acrylamide as comonomers. The thermal performances of copolymers were investigated. The results showed that by introducing acrylamide the initial reaction temperature of PAN was advanced; double peak appeared while the exothermic peak was widened, meantime the weight loss and exothermic reaction velocity dropped, which would promote PAN precursor to form uniform cyclic ladder structure during pre-oxidation and carbonization phases, finally increase the mechanical properties of carbon fiber.
  • Effect of Reduction Agent (Hydrazine) on the Performance of LiNi0.5Mn1.5O4 CathodeMaterials
    LI Bao;ZHANG Jun-hao;DAI Dong-mei;CHANG Zhao-rong
    . 2013, 44(11): 1535-1537.
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    Reduction pretreatment to the precursor of LiNi0.5Mn1.5O4 was carried out by adding hydrazine to a solution of NaOH during precursor synthesis. The effect of reduction agent on the performance of LiNi0.5Mn1.5O4 was obtained by comparing the structure and electrochemical properties of the reduction pretreated sample with those of pristine samples (LiNi0.5Mn1.5O4 without hydrazine pretreatment). Results of electrochemical experiments show that the LiNi0.5Mn1.5O4 from the precursor pretreated with hydrazine has a much higher special capacity than the pristine sample at 2 C charge/discharge rate. Moreover, the former shows a better capacity keeping activity than the later (pristine sample). Results from powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) reveal that the LiNi0.5Mn1.5O4 from the hydrazine pretreated precursor shows a much pure spinel phase (no impurity phase detected), high degree of crystallinity and well-distributed diameter of grains, while the pristine sample contains a minor impurity phase and shows a low degree of crystallinity. In this paper, the reduction pretreatment to the precursor of LiNi0.5Mn1.5O4 was proved to be beneficial to electrochemical performances of LiNi0.5Mn1.5O4, which should be helpful in the following studies on the mass production of LiNi0.5Mn1.5O4.
  • Effects of trace water on the structure and dissolving capacity of polyurethane prepolymer
    JIANG Yu-xu;CHENG Xu;WU Yan;Du Zong-liang
    . 2013, 44(11): 1538-1542.
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    In order to research the effects of the water on structure and polymerization reactive of the polyurethane，the polyurethane preliminary prepolymer was prepared by means of one step firstly. Then the effects of the amounts of water and the extending temperature on the intrinsic viscosity and the molecular weight distribution of polyurethane prepolymer, and dissolving capacity of polyurethane prepolymer in THF were investigated. The aggregation structure of the water expended polyurethane prepolymer was characterized by FT-IR. The results shown that the polyurea structure is generated by –NCO reacting with water because of increasing hydrogen-bond interaction between the hard segments of the polyurethane chains and decreasing hydrogen-bond interaction between the hard segments and soft segments of the polyurethane chains. The polyurethane prepolymer could be extended by trace water. But the crosslinking prepolymer formed with increasing water amount, and the insolubility gels came into being. With increasing temperature the crosslinking reaction accelerated.
  • Effects of Acid and Alkali Treatments and Subsequent Heat Treatments on the Bioactivity of Titanium
    WANG Xiao-hong;CAO Yang;LIU Zhong-xin;YANG Liang;TU Jin-chun
    . 2013, 44(11): 1543-1547.
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    The TiO2 films on titanium substrates were fabricated by acid and alkaline. After the samples annealed at 450°C and 700°C, different crystallinity and surface morphology of TiO2 films were obtained respectively. Such samples have been dipped into simulated body fluid (SBF) electrolyte, observed the hydroxyapatite deposition in their surfaces, and further researched MG-63 cell adhesion to explore their biological evaluation. The results show the sample annealed at 450°C has the best biological activity than those annealed at 700°C and unannealed for its morphology of nanoscale structure like flower mesh, and the sample annealed at 700°C has the worst biological activity than those annealed at 450°C and unannealed for its greater nanorod diameter and closer structure.
  • Preparation and research of a hollow molecular imprinted polymer for adsorption of 4-methyl dibenzothiophene
    JIANG Bo;CHU Jin-yu;LIU Lu-kuan;XU Wan-zhen;HUANG Wei-hong
    . 2013, 44(11): 1548-1553.
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    A hollow molecular imprinted polymer (H-MIP) was synthesized on silica as a sacrificed material by using 4-methyl dibenzothiophene (4-MDBT) as template, 4-vinyl pyridine (4-VP) as function monomer. The sorbents were characterized by the Fourier transform infrared spectroscopy, nitrogen adsorption and scanning electron microscopy. The adsorption properties of the sorbents were investigated in the model oil. The results indicated that a molecular imprinted layer with porous structure was successfully synthesized on the surface of silica, and H-MIP not only had better surface characteristics but it also performed good specific recognition to 4-MDBT. The adsorption process followed the pseudo-second-order kinetic model, and it was described well by Freundlich isotherm model. The adsorption thermodynamic parameters showed the adsorption was spontaneous endothermic process. The equilibrium adsorption amount reached 18.31498mg/g at the temperature of 328K, and the adsorption time was 3h.
  • Increase of thermal conductivity of magnetic nanofluids in external magnetic field
    PAN Zhi-dong;NKURIKIYIMFURA Innocent;WANG Yan-min
    . 2013, 44(11): 1554-1557.
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    This paper investigated the enhancement of thermal conductivity of engine oil based magnetite (Fe3O4) nanofluids, which were prepared via a co-precipitation method with and without ultrasound assistance in the presence of external magnetic field. The thermal conductivity was determined using a thermal constants analyzer. Effects of particle size, particle volume fraction and magnetic field on the thermal conductivity ratio of the magnetic nanofluids were analyzed. The results show that the thermal conductivity can be enhanced with the finer magnetite particles used in the nanofluid at a greater particle volume fraction. In addition, the thermal conductivity enhancement was found to be related to magnetic field parallel to temperature gradient.
  • Uncertainty interval numerical analysis of transient heat conduction temperature
    DU Xiu-yun;TANG Zhen-an;XUE Qi-wen
    . 2013, 44(11): 1558-1561.
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    A general numerical model is presented for transient heat conduction problem with interval parameters. The eight-point finite element model is given, taking account of in homogeneity and parameters distribution. With interval finite element method based on the element and interval extension theory, the uncertainty of system is separated and the finite element model of the deterministic part and the uncertain part is established. A time stepping scheme is used for transient analysis and the range of temperature field is obtained. Satisfactory numerical validation is given and results show that the proposed numerical model is applied to the problem which shows its effectiveness.
  • Synthesis and Electrochemical Properties of LiNi0.5Mn1.5O4 Cathode Materials for Lithium-ion Batteries
    LIU Yan-li;HUANG Rui-an;LIU Shan;YAO Yao-chun;FANG Hai-sheng;YANG Bin;DAI Yong-nian
    . 2013, 44(11): 1562-1565.
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    Abstract: The lithium-ion battery cathode material LiNi0.5Mn1.5O4 with cubic spinel structure were synthesized by a chemical route using Li(CH3COO)·2H20，Ni(CH3COO)2·4H20，Mn(CH3COO)2·4H20 and H2C2O4·2H2O as raw matericals, and polyethylene glycol 20000 as dispersant. The evaluation of the synthesized samples were carried out by using X-ray diffraction, scanning electron microscopy and charge-discharge tests. When calcinated at 850℃, the LiNi0.5Mn1.5O4 samples show the best electrochemical performance.The specific discharge capacities are 132.9mAh·g-1、117.3mAh·g-1、111.2mAh·g-1、104.8mAh·g-1 and 91 mAh·g-1 at 0.2C、0.5C、1C、2C、5C (1C=146.7mAh·g-1) rates in the range of 3.5~4.9V, and after 20 cycles the capacity retention are 93.2%、98.9%、97.4%、97.3%、95.5%, respectively.
  • Study on magnetic, dielectric and magnetodielectric properties of orthorhombic YFeO3
    ZHANG Run-lan;CHEN Chang-le;WANG Jing;LIU Xiang-rong;JIN Ke-xin;GAO Yu-qiang
    . 2013, 44(11): 1566-1569.
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    YFeO3 ceramic powder was synthesized by sol-gel method. XRD showed that orthorhombic YFeO3 can be obtained with well crystallization above a sintering temperature 850℃. The result of hysteresis loop measuring indicated that orthorhombic YFeO3 shows weak ferromagnetism. Under an applied magnetic field H=0kOe, saltation appears which maybe result from the magnetic anisotropy of YFeO3. The curves of εr-T and D-T showed that dielectric constant of YFeO3 increases with the rise of temperature, accompanied with frequency dispersion phenomenon, and YFeO3 shows dielectric relaxation behavior at low temperature. A large MD coefficient about 35.11% was observed at 1kHz in a magnetic field of 0.8T which indicates the exist of magnetodielectric effect on YFeO3.
  • Preparation and electric response of BaTiO3/Gelatin core-shell composite particles
    LI Li;HAI Jin-ling;XIE Chao;GAO Ling-xiang
    . 2013, 44(11): 1570-1573.
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    To improve the BaTiO3 particles response to electric field in hydrous elastomers, the composite particles with BaTiO3/Gelatin core-shell structure were prepared by microemulsion method. Particles’ morphology, structure, composition and surface hydrophile have been characterized by TEM、XRD、FT-IR、TG and optical contact angle measuring instrument. The results show that the cubic BaTiO3 particles surfaces uniformly coated with a layer of about 40~50nm Gelatin, Gelatin shell accounts for about 4.0% of the total weight and the particles surface still keep hydrophilic. BaTiO3 and BaTiO3/Gelatin composite particles were dispersed into gelatin (and chitosan)/glycerol hydrous elastomers cured without/with an electric field, and the difference of storage modulus of the opposite elastomers suggests the particles’ response behavior. It is indicated that BaTiO3/Gelatin composite particles have stronger electric response than pure BaTiO3 particles, especially in gelatin hydrous elastomer. It means that polymer-coating can obviously improve BaTiO3 particles electric response, and when the interface compatibility of particles surface with dispersion system is better, the particle may possess stronger response.
  • Preparation and properties of flexible calcium alginate sponges as a novel wound dressing
    HE Rui-hua;ZHANG Chuan-jie;ZHAO Jin-chao;XIONG Wei;ZHU Ping
    . 2013, 44(11): 1574-1578.
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    Calcium alginate sponges were modified with glycerol as plasticizer in order to improve their flexibilities, so that these sponges could be applied as wound dressings. The modified calcium alginate sponges are non-friable, able to be bended optionally, with smooth and flat surfaces, and don’t drop fragments during friction process. As the glycerol content of calcium alginate sponges increase, their flexibility, breaking elongation rate and water absorbing capacity increase, but their breaking strength, initial modulus, porosity, permeability and water remaining capacity decline. The optimum modification conditions for calcium alginate sponges are as following: concentration of glycerol aqueous solution is 6 wt. %, treating time is 12 h and treating temperature is 30 ℃. Under these conditions, flexibility index, breaking strength, porosity and permeability of flexible calcium alginate sponges are 326.8o, 0.376 Mpa, 82.3% and 59.8%, while their absorbing and remaining water capacity are 13.1 g/g and 6.73 g/g.
  • Effect of the Soft Segments Construction on Morphology of Aqueous Polyurethane/ Polyacrylate Latexes
    WU Yan;CHENG Xu;JIANG Yu-xu;DU Zong-liang
    . 2013, 44(11): 1579-1583.
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    In order to research the effect of the soft segments construction of the aqueous polyurethane (WPU) dispersion on latexes morphology of the aqueous polyurethane/polyacrylate composite emulsions (PUA), the PUA was prepared by emulsion polymerization used WPU as seed emulsion mixed acrylic monomers and initiators previously. The particle size distribution and morphology of the PUA latexes were investigated respectively. The results showed that the PUA latexes do not appear obviously core-shell structural feature as the WPU with shorter soft segment chain, while they form a mixture structure of the transition, gradient and strawberries types as it with increased soft segments chain length. The PUA latexes present more complex core-shell structural feature as the WPU with the mixtures soft segments of shorter and longer chain.
  • Using Vesicle-like Structures of Amphiphilic Block Copolymer As an In-situ Reactor for Preparing Nanosized Silver Composite Materials
    WANG Yuan;TANG Jian-guo;LIU Hai-yan;WANG Yao;LIU Ji-xian;HUANG Lin-jun;HUANG Zhen;XU Qiang-song;XIONG Lei;LIANG Yong
    . 2013, 44(11): 1584-1587.
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    Polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) was synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization. The amphiphlic block copolymer, Polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) was evidenced by the means of 1H-NMR. This amphiphilic block copolymer was then dissolved in the toluene，which is a selective solvent for PS and P4VP respectively. And then studied the self-assembly behavior. Some testes show that the polymer in certain conditions can self-assemble into vesicle-like structures, which as an in-situ reactor successful preparation of nanosized silver composite materials. The result was characterized by UV-Vis spectra、X-ray diffraction (XRD)、scanning electron microscopy (SEM) and energy dispersive spectrometer（EDS）.
  • Synthesis and Characterization of the dual-modified composite Fe3O4/CdSe/CdS magnetic fluorescent compound
    ZHANG Li-Jie;GU Yin-jun;MA Qian;LIU Yong-jian
    . 2013, 44(11): 1588-1592.
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    Fe3O4 magnetic nanoparticles were prepared using hydrothermal coprecipitation process of ferric and ferrous ions. The as-prepared nanoparticles were further modified by γ-(2,3-epoxypropoxy)propytrimethoxysilane (KH-560) to obtain silicone modified Fe3O4 nanoparticles. Also, the water-soluble CdSe /Cds bearing amino have been synthesized using L-cysteine hydrochloride (L-Cys) as stabilizer, At last, CdSe/CdS were linked to Fe3O4 to form luminescent/magnetic bifunctional nanoparticles. The as-prepared composites with a typical diameter of 40 nm show 21.287 emu/g of saturation magnetic susceptibility. Such material still retains a strong photoluminescence effect of CdSe/CdS quantum dots and also exhibits a typical superparamagnetic behavior of Fe3O4 nanoparticles.
  • Synthesis of a thermosensitive hydrogel and its fire suppressing performance
    JIA Chun-lei;IANG Zhong-an;YANG Yi;TANG Kai
    . 2013, 44(11): 1593-1597.
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    A thermosensitive hydrogel were prepared by free radical polymerization methods. The low critical soluble temperatures (LCST) and viscosity of and the thermosensitive hydrogel respectively. The radiant heat and the temperature were recorded by several heat probes and thermocouples during extinguishing. The results showed that the fire extinguishing-time of the thermosensitive hydrogel is shortest at the same practical rate of application among the three. Consumption of extinguishing agent is the least. The water damage to the section unfired is low after fire extinguishing. The extinguishing agent residual is easy to clean. Detecting result of dangerous gas showed no additional toxic gas was detected during fire extinguishing.
  • The Synthesis of Mannose Derivatives and Grafted onto Fluorescent-magnetic Nanocomposites
    PAN Yuan-yuan;LI Sai;LI Ya-ru;ZHANG Xue-lian;LI Zhen-zhen;ZHOU Xue;ZHAO Qiang
    . 2013, 44(11): 1598-1602.
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    Abstract: The mannose derivatives were synthesized by esterification, etherification and deacetylation. And fluorescent-magnetic nanocomposites grafted with mannose derivatives were synthesized by click chemistry. Fluorescent-magnetic nanocomposites (FMNPs) (Fe3O4@SiO2@FITC-SiO2, core/shell) were conjugated with N-Hydroxysuccinimide (NHS)-activated 4-oxo-4-(prop-2-ynyloxy) butanoic acid (NHS-activated ester) by the linker of 3-aminopropyltriethoxysilane (APTES), and alkyne-functionalized fluorescent-magnetic nanocomposites (FMNPs-alkyne) were produced. And 3′-Azidopropyl-O-α-D-manno- pyranoside was grafted on the surface of FMNPs-alkyne via huisgen 1,3-dipolar cycloaddition reaction. The results of NMR spectra and ESI mass spectra showed that the successful synthesis of mannose derivatives. Fourier transform infrared spectra (FT-IR) and Fluorescence spectra (FL) showed mannose-functionalized fluorescent-magnetic nanocomposites (FMNPs-mannose) were obtained. The products have strong magnetism and stable fluorescence properties.
  • Research on the Dispersion Uniformity and Stability of Nano-ATO
    LUO Shu-xiang;SONG Zhen;LI Jun-ling
    . 2013, 44(11): 1603-1606.
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    The efficient dispersion and long-term stability of nano-ATO are the key factors to prepare nano transparent insulation material. Influences of the value of pH, type and content of dispersants, surface characteristics of particles, dispersing technology, and viscosity on the dispersion stability are discussed. The dispersion effect is characterized by methods of sedimentation, spectrophotometry and scanning electron microscope. The results show that the dispersion effect can reach the optimal state by using compound dispersant with its dosage being 5% of particles mass, and adopting dispersion ways of combining ultrasound and ball milling. The stability of particles can be effectively improved by increasing the sphericity of particles and the viscosity of dispersion medium. The value of pH has a little impact on dispersion stability. The Nano-ATO dispersion paste and nano transparent insulation coating with high uniformity and long-term stability is obtained by optimizing dispersion process.
  • Effect of Nb substitution on Phase Formation and Curie Temperature in LaFe10.8-xNbxCo0.7Si1.5C0.2 Magnetic Refrigeration Alloys
    SUN Song;YE Rong-chang;LONG Yi;WU Yun-fei
    . 2013, 44(11): 1607-1611.
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    A series of LaFe10.8-xNbxCo0.7Si1.5C0.2（x=0,0.01,0.07,0.10,0.14,0.36,0.74） alloys with nominal composition were prepared by arc-melting in high purity argon atmosphere. The influence of Nb substitution on the microstructure in as-cast and annealed states has been studied. Besides, the compositions and average volume fractions of phases has also been analyzed.Results show that Nb substitution promotes fining of the as-cast microstructure and increasing the formation of 1:13 phase when annealed. Refining effect is most obvious in as-cast microstructure when x=0.07. Furthermore, an almost single 1:13 phase is obtained for x=0.07 at 1373K for 3 days. DSC curves show that LaFe10.8-xNbxCo0.7Si1.5C0.2（x=0,0.01,0.07,0.10,0.14,0.36）compounds undergoes a second order magnetic phase transition in the vicinity of TC. When Nb content x varies from 0 to 0.36, the Curie temperature of LaFe10.8-xNbxCo0.7Si1.5C0.2（x=0,0.01,0.07,0.10,0.14,0.36）compounds increases at first, then decreses.
  • Study of novel hydrophilic composite nanofiltration membrane
    CAO Xu-zhi;PING Zheng-hua;LI Ben-gang;GUO Bin
    . 2013, 44(11): 1612-1615.
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    A novel hydrophilic composite nanofiltration membrane was prepared by UV irradiation two-step graft polymerization of sodium styrene sulfonate (SSS) and diallydimethyl ammonium chloride（DADMAC) onto the surface of ultrafiltration membranes made of polyetherketone cardo (PEK-C). The effect of the irradiation time and operation conditions on the membrane performance was studied by measuring the salt retention through the membrane. The results showed that the composite nanofilration has high retention and permeation flux to high valent anionic salts and salts composed of high valent co-ions and counter-ions.
  • The silicone modified aluminum-chromium-phosphate wave-transparent materials
    CHEN Da-qing;WANG Hai-bing;HOU Ji-chuan;LEI Yong-lin;LV Shu-zhen
    . 2013, 44(11): 1616-1619.
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    In the paper ,the preparation of the silicone modified aluminum-chromium-phosphate and the composites was studied.The aluminum-chromium-phosphate was modified by adding the silicon resin, the tensile lap-shear strength of the treated aluminum-chromium-phosphate increased from 1.2MPa to 3.0MPa or more, its dielectric constant reduced from about 4.0 to about 3.6; the flexural strength of the composites increased from 80Mpa to more than 100Mpa and the the moisture rate of the composites reduced in 71%
  • Influence regularities of chemical admixtures on creep
    ZHANG Yi;QIAN Chun-xiang;ZHAO Fei;QU Jun;GUO Jing-qiang;Michael Danzinger
    . 2013, 44(11): 1620-1623.
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    The influence law of naphthalene based plasticizer, polycarboxylic superplasticizer, retarding component and shrinkage reducing component on creep characteristics of concrete with same mix proportion were studied by the self-made creep loading device and the influence mechamism were analyzed by testing non-evaporable water of paste with same water-binder ratio with concrete and internal relative humidity of loaded concrete specimens. The results indicate that: Compared with naphthalene based plasticizer, polycarboxylic superplasticizers could significantly reducing creep of concrete, and this effect of early-strength polycarboxylic superplasticizer is the best; shrinkage reducing components could also reduce creep, the incorporation of retarding component have an adverse effect on creep; polycarboxylic superplasticizers and shrinkage reducing component reduce creep by decreasing the internal moisture transmission and diffusion to external environment; early-strength polycarboxylic superplasticizer make concrete have more hydration products, which have certain advantages on increasing strength and lower creep; incorporation of retarding component slows hydration and reduce the total hydration product contents, therefore strength reduced and creep increased.
  • Effects of cordierite on V2O5-WO3/TiO2 catalytic performance
    LIU Qing-cai;XI Wen-chang;YANG Jian;HE Yuan-yuan;HUANG Rui;HONG Yan
    . 2013, 44(11): 1624-1628.
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    The V2O5-WO3/Cordierite-TiO2 honeycomb catalysts were prepared by solid-liquid mixing method, with cordierite modified. Surface morphology、thermal stability crystal structure、abrasion resistance and activity were studied by SEM、XRD 、BET、 abration equipment and simulated flue gas analyzer，respectively. The results indicated that the cordierite modified was introduced , V2O5-WO3/Cordierite-TiO2 honeycomb catalyst was a large number of micro pores in its surface(which promote the reaction), good thermal stability. The phase of V2O5 and WO3 was amorphous or nanocrystalline state after it was calcined at 700℃. Abration ratio of V2O5-WO3/10%Cordierite-TiO2 was law. Especially in the 250~460 ℃ reaction , the denitration rate can be maintained above 80%.
  • Zn transforms into ZnO nano particle film at room temperature and mechanism
    LIU Chao;WANG Shu-lin;JIAN Dun-liang;ZHU Yu-fang;ZHAO Li-feng;YANG Quan-fu
    . 2013, 44(11): 1629-1634.
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    Research provides a simple , efficient and direct method to prepare ZnO NanoParticles and ZnO NanoParticles film. Zn powder mechanically polished by rolling vibration mill – the invention of professor WangShuLin is used as raw material ;unique liquid agent of oil phrase cyclohexane and water phrase was utilized as dispersion; ultrasonic wave was used to break and hydrolyze soft agglomerated Zn NanoParticles into easy-disperse ZnO NanoParticles.This kind of ZnO NanoParticles can be exploited of preparing well-distributed ZnO NanoParticles film. Analysis of XRD,TEM shows that ZnO NanoParticles obtained in this approach is HCP crystal structure and well dispersed .Testing results of AFM,EFM, indicate this kind of ZnO NanoParticles can be used to prepare NanoParticles film; Nano particle surface electrical properties are quite different. I-V testing shows that samples prepared by different raw materials performs various break-over voltage and rectification character. This method transforms Zn to ZnO at room temperature and provides an innovative, economic way to improve and manufacture nano structure as well as rectification devices.
    • 工艺 ·技术
  • Study on characterization and electrodeposition of MnSe/Ti thin films
    LI Wen-po;LI Chun-huan;MA Si;XIE Zhao-ming;ZHANG Sheng-tao
    . 2013, 44(11): 1635-1637.
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    Thin films of manganese selenide (MnSe) were deposited on titanium substrates from an aqueous electrolytic bath consists of 0.1MMnSO4 and 0.002MSeO2 using electrodeposition technique. Cyclic voltammograms show that co-deposition of Mn and Se is observed in the potential range from -1.65V to -1.70V. Characterization of the thin films deposited respectively at -1.55V，-1.60V，-1.65V，-1.70V, is studied using XRD, SEM and EDS, and this results reveal that the cubic structure of this deposited films with preferential orientation along (200) plane is independent of this selected potentials, the morphological and stoichiometric number of this deposited films is dependent of this selected potentials. Thin films of MnSe with different properties can be deposited by the using of different potential.
  • Research on microwave synthesis polyphosphazene with carbazole grafted by nitrobenzene azo and its optical conductivity property
    ZHANG Wen-long;JIANG Wen-ying;ZHAO Chun-shan;JIANG Qiang;ZHAO Cheng-long;WANG Xuan
    . 2013, 44(11): 1638-1641.
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  • Study of preparation conditions of high-temperature superconductor (Bi, Pb)2Sr2CaCu2O8 thin films by pulsed laser deposition
    ZHANG Hui;HE En-quan;YANG Ning;ZHANG Peng-xiang;RUAN Yao-zhong
    . 2013, 44(11): 1642-1645.
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    In this paper, high-TC superconducting compound (Bi, Pb)2Sr2CaCu2O8 thin films were prepared using pulsed laser deposition (PLD) technique. The influences of deposition conditions on the crystallization of the films were investigated systematically, and the optimized preparation conditions were worked out. For both low deposition temperature and high deposition temperature cases, the homogeneous, single-phased (Bi, Pb)2Sr2CaCu2O8 films of c orientation were obtained reproducibly. In comparison to the case of high deposition temperature, the crystallization of the film grown at low temperature was better.
  • Research on preparation technique of IPMC artificial muscle
    XU Yan;ZHAO Gang;YANG Li-ming;ZHENG Jin-xing;MA Chang-shun;ZHU Yu-min
    . 2013, 44(11): 1646-1650.
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    In order to reduce costs and improve the performance of IPMC, an improved reduction preparation technique with surface treatment was designed using favorable electrically conductive Ag for the metal electrodes on both sides of the artificial muscle. An IPMC artificial muscle test platform was also designed to test the performance of the developed sample. The main performance measure discussed in this paper is IPMC service life. The results show that the improved preparation technique period shortens 30% and the IPMC samples prepared can meet practical requirements. The improved preparation method resulted in an increase in the water retention capabilities of an IPMC sample. A normally prepared sample, actuated in air, was observed to only be capable of moving for approximately 60 cycles while the surface treated sample recorded increased performance; it was able to move for 90 cycles while actuating in air. The improved preparation method increased water retention in IPMC and was therefore able to increase its service life by approximately 50%.
  • Preparation of crosslinked chitosan/activated carbon composite membrane by microwave irradiation and its adsorption property
    BI Shao-dan;LIU Qing-yu;DANG Ming-yan;MA Xiao-jie
    . 2013, 44(11): 1651-1655.
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    Abstract：A cross-linked chitosan/activated carbon composite membrane(CCTS) was prepared under microwave irradiation. The structure of product was characterized by IR and SEM，and its main performances, adsorption mechanism and adsorption conditions of copper ions were investigated. Results showed that the rough surface of CCTS membrane increases the specific surface. Part of -NH2 groups of chitosan took part in cross liking reaction, -NH2 groups and -OH groups of CCTS complex with copper ions. The adsorption is monolayer and its experimental data fit Langmuir adsorption isotherm.The uptake amount of copper ions was up to 117.4 mg/g at 25℃，initial concentration of copper ions solution 50 mL 200 mg/L，pH 5.5 for 6h by 0.05 g CCTS. Compared with CCTS under water bath heating，CCTS under microwave irradiation has a higher adsorption capacity，with simple operation and easy control process.
  • Preparation and characterization of Ag-Cu coated powder
    MENG Zhi-han;XIE Ke-nan;LIAO Li;LI Yan-jun
    . 2013, 44(11): 1656-1662.
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  • Effect of sintering temperature on gas hydrogen absorption-desorption characteristics of La0.67Mg0.33Ni3 alloys
    LIU Jing
    . 2013, 44(11): 1659-1662.
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    La0.67Mg0.33Ni3 alloys were prepared by magnetic field assisted sintering synthesis (MASS). The effects of sintering temperature on phase structure, micro-morphology and gas hydrogen absorption-desorption characteristics properties were investigated. The results show that the main phases of alloys produced under 973~1123 K are all PuNi3 type (La, Mg)Ni3. The sample prepared under 1023 K can be activated after two hydriding/dehydriding cycles and absorbs 90% of the maximum hydrogen capacity (1.58 wt.%) within 30 s under 300 K. The PCT results indicates that the sample prepared at 1023 K has the minimum hydriding/dehydriding hysteresis (0.519), the maximal hydriding/dehydriding capacity (1.525 wt.%/ 1.474 wt.%) and the maximal dehydrogenated rate (0.967).
  • Effects of high intensity ultrasonic Processing on Microstructure and Mechanical Properties of In-situ Al3Ti/A356 Composites
    XU Yong-hua;CHEN Gang;QIU Chen;ZHAO Yu-tao;HOU Wen-sheng;YU Ying
    . 2013, 44(11): 1663-1666.
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    The In-situ Al3Ti /A356 composites were synthesized by melt direct reaction method under high intensity ultrasonic field in A356-Ti system. The phase content and microstructure of composites were investigated by SEM and XRD, and the fracture behavior was studied by tensile observation. The results indicated that the size of Al3Ti particles of composites had become smaller and the distribution has been improved after high intensity ultrasonic treatment. When the ultrasonic power is up to 1.2 KW/cm2 and the ultrasonic treating time is 360 s，the smallest size of Al3Ti particles is obtained. The size is in the range of 0.5~2 μm. The tensile strength, yield strength and the elongation of the composites achieved 281.83 MPa, 227.72MPa and 5.6%, which are 16.2%, 10.3% and 33.3% higher than those without ultrasonic assistance, respectively.
  • The orthogonal experiment coated titanium dioxide ZrO2 optimization process
    DUAN Hai-ting;HOU Qing-lin;LUO Chi;HOU Yi-hui;CHEN Jian-hua;LIU Yue-jin
    . 2013, 44(11): 1667-1671.
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    The thesis mainly explores the effect of property of rutile titanium dioxide being pre-coated with ZrO2 with sodium hexametaphosphate as dispersant, as well as drops speeding rate, the dosage of dispersant and coating agent and PH value which is based on the orthogonal test L9(34). The property of rutile Titania uncoated and coated are also compared to get coated optimization test condition with ZrO2 by SEM, FT-IR , TEM, adopting Nano-zs potential instrument and paint film ultraviolet radiation aging. The result shows that the chemical properties of the rutile titanium dioxide with pre-coated was steady and can effectively shielding the photochemical activity and adsorbability, dispersibility and weather ability were better on the speed of liquid in 5 drops/min, the amount of dispersant is 0.1%, capsular content is 2%, the PH of system is 8.5～9.0.
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