25 September 2011, Volume 42 Issue S4
    

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    研究与开发
  • The Preparation and Mlectromechanical Characteristic of the Multilayer Artificial Muscle
    HE Hong Lin ;;;
    . 2011, 42(S4): 1-0.
    Abstract ( ) Knowledge map Save
    To meet the demands of ionic polymer-metal composite applied in practical engineering, the preparation of the muti-layer IPMC has been studied. Firstly, based on the sol-gel method, how to make use of DuPont Nafion-Liquid to Prepare the primary nafion-membrance is proposed. Then, by utilizing Nafion-liquid as adhesives, multiple membranes are combined into a multilayer film with the heat pressure method. And finally, the multi-layer IPMC is processed with techniques of surface coarsening, Ion exchange and electroless-plating. The reliable densification of inner structure of multi-layer IPMC is found in section analyses with SEM. The Electro-Mechanical properties of multi-layer IPMC are tested. The results show that: comparing with single-layer IPMC, the dual-layer IPMC is capable of increasing output power by 80% without significant reduction of bending displacement, which suggests that to some extent, the proposed technique is a better solution to the problems of IPMC’s insufficient output power.
  • Preparation and Research of HDPE/PA6 Barrier Blends
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    . 2011, 42(S4): 2-0.
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    Maleic anhydride grafted high density polyethylene (HDPE-g-MAH) was prepared by melt extrusion. The infrared spectroscopy confirmed the grafting reaction. HDPE/PA6 blends were prepared with the graft as compatibilizer. Effects of PA6 and compatibilizer content on morphology, mechanical properties and gas barrier properties of the blends were studied. SEM indicated that the compatibilizer (HDPE-g-MAH) could significantly improve the compatibility of HDPE and MAH. The oxygen barrier property of HDPE was significantly enhanced by PA6.
  • Electrochemical Deposition of Cuprous Oxides on ITO Substrates in Acid Electrolyte
    Hu Fei ;
    . 2011, 42(S4): 3-0.
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    The electrodeposition of cuprous oxides were investigated in an acid electrolyte, and the morphology and structure of Cu2O thin films electrodeposited by a two-electrode system Cu(II) solution were studied. The high bath temperature gave rise a faster reaction rate for Ac-HAc conjugated system, which prohibited the growth of metallic copper. The higher concentration of cupric ions was favor of the Cu2O growth through (200) plane due to a higher concentration gradient. The XRD results showed that Cu2O thin film can be electrodeposited over a large current domain (4 mAcm-2) as compared to those using a three-electrode system (1 mAcm-2). The Cu2O film has porous nature morphology with Eg of 2.4 eV.
  • Preparation and performance of Montmorillonite/epoxy resin composite material
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    . 2011, 42(S4): 4-0.
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    In this paper, We first selected three ratios of KH550, KH560 and KH570 silane coupling agent to modify MMT, and then added modified MMT of 5％ to epoxy. After We stired it with electromagnetic for an hour. Added polyamide resin. Half an hour later, we can brushing it on sheet iron. XRD and TGA analysis indicated silane coupling agent had added to MMT; FT-IR analysis indicated that MMT acted with silane coupling agent. The corrosion resistances of the composite paint films were studied by the means of electrochemical impedance spectroscopy (EIS) test, which showed the composite which was modified by 0. 4％KH570 has excellent corrosion resistance.
  • The crystallization kinetics study of Finemet-Co amorphous alloys
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    . 2011, 42(S4): 5-0.
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    Amorphous ribbons Fe73.5-xCoxSi13.5B9Cu1Nb3 (x=10, 30, 50) were prepared by the standard single copper wheel melt spinning technique in the air atmosphere. The isothermal annealing was carried out at 550 ℃ and 600 ℃ for 1 h in a vacuum furnace to induce the formation of nanocrystallite in amorphous ribbons. The X-ray diffraction (XRD) analyses showed that the average sizes D of α-Fe(Co, Si) grains for the samples annealed at 550 ℃ were 19.3 nm, 20.1 nm, 22.8 nm and those for the samples annealed at 600 ℃ were 24.8 nm, 25.2 nm，26.5 nm, respectively. The primary crystallization activation energies of amorphous ribbons were calculated using Kissinger, Ozawa and Augis-Bennett models based on differential thermal analysis data. The local Avrami exponenet n for primary crystallization was calculated using Johnson-Mehl-Avrami (JMA) equation. The significant variation of local Avrami exponent n with crystallized volume fraction α demonstrated that the primary crystallization kinetics of amorphous ribbons varied at different stages. In the initial stage (0<α<0.2), the crystallization mechanism was bulk crystallization with three dimensional nucleation and grain growth controlled by diffusion at decreasing nucleation rate. In the following stage (0.2<α<1.0), it was surface crystallization with one dimensional nucleation and grain growth at a near-zero nucleation rate.
  • Synthesis and Characterization of Carboxyl-terminated Poly(lactic acid)
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    . 2011, 42(S4): 6-0.
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    摘 要： 以乳酸为原料，辛酸亚锡为催化剂，采用梯度升温法，在168℃、0.098 MPa下直接熔融缩聚生成端羧基聚乳酸共聚物P(LA/SA)、P(LA/CA)和P(LA/AC)。用乌氏粘度法、FT-IR、1H-NMR、DSC、TGA及XRD等对共聚物进行了表征。结果表明，和PLA相比，三种端羧基共聚物Tg均有不同程度的降低，说明端羧基的引入降低了聚乳酸的刚性；TGA结果表明各共聚物热稳定性提高，为一步热分解过程；XRD分析得出P(LA/SA)和P(LA/AC)比PLA的结晶度有所升高，而P(LA/CA)的结晶度略微降低，说明可通过调节乳酸和改性剂的配比来调节材料的力学性能。
  • A Ru-complex for Solar Cell
    WANG yanrong ;;;;
    . 2011, 42(S4): 7-0.
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    To obtain a photosensitizer for photovoltaic application, a Ru-complex (Ru-[bpy(COOEt)2]2Cl2), was synthesized and characterized by 1H NMR, MS, FT-IR, UV-Vis and element analysis. Ru-[bpy(COOEt)2]2Cl2 in DMF exhibited strong absorptions in the region of 350-800 nm and its energy levels for the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) levels were estimated from cyclic voltammetry as -5.07 and -3.16 eV, respectively. TG indicated that Ru-[bpy(COOEt)2]2Cl2 has good themal stability under 300 oC. A photovoltaic device was prepared by spin-coating thin films from a solution containing Ru-[bpy(COOEt)2]2Cl2, PCBM and PVK (1:1:1) (w/w/w) on an ITO (indium-tin oxide) glass using aluminum as a top electrode. Photovoltaic behavior of the device was investigated under a 55 mW cm-2 white arc lamp illumination showed a typical rectifying behavior as observed through current density-voltage (J-V) characteristic measurement. The Voc, Isc and power conversion efficiency could be improved by inserting a modification layer of PEDOT:PSS.
  • Fabrication of Polylactide Porous Scaffolds by Frozen Extracion Phase Separation Method
    Jian-Jin JIAO
    . 2011, 42(S4): 8-0.
    Abstract ( ) Knowledge map Save
    To prepare the polylactide(PLA) porous scaffolds whose structure and property could meet the needs of bone tissue engineering,a series of PLA porous scaffolds were prepared by frozon extraction phrase separation method with using 1,4-dioxane and water as the blend solvent and poly(ethylene glycol)(PEG) as the porogen. The effect of solvent composition, PLA concentration and the amount of PEG on the structure and property were studied.The results show that the addition of PEG was benificial for forming three-dimensionally porous scaffolds.With the PEG amount increasing, the porosity slightly increased while the compressive strength improved. With the increasing of PLA mass fraction, the porosity decreased obviously while the compressive strength improved. When the mass fraction of water is no more than 12wt%~60wt%, the mass fraction of PCL is no more than 12.5wt% and the mass fraction of PEG is no more than 20wt%, porous throughout scaffold materials with satisfying porosity and mechanical property could form.
  • Mechanism study of diphenylphosphinic acid retardant the oxazoline modified polyacrylonitrile
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    . 2011, 42(S4): 9-0.
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    The combustibility of modification polyacrylonitrile retarded by diphenylphosphinic acid was studied by LOI, TGA and CONE. The value of LOI and CONE HRR show the combustibility of modified PAN make a great progress when the reaction has happened between modified PAN and diphenylphosphinic acid. The test result of TGA shows the combustion mechanism is condensed phase on the condition of smoldering combustion or weak flame; but the test result of CONE, Mass loss rate (MASS), Carbon monoxide and Carbon dioxide production rate, mean Effective heat combustion（mean EHC）, mean Specific extinction area（mean SEA) and so on show the combustion mechanism of PMPAN is synergy of condensed phase and vapour phase under the condition of that the temperature of outer environment is rapidly increasing from the forced combustion.
  • Electrochemical Performance of Molybdenum Carbides/Carbon Composites with High Specific Surface Area
    ;REN Hai Juan;
    . 2011, 42(S4): 10-0.
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    Abstract：Molybdenum carbides/carbon composites (MCCs) with high specific surface area were prepared using the direct carbonization of a mixture of hydroxylpropyl cellulose, polyvinyl alcohol, K2MoO4 and K2CO3 at 900 °C in flowing Ar. X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and electrochemical tests were used to characterize the prepared MCCs. X-ray diffraction pattern showed the formation of α-Mo2C with small amount of Mo3C2 in carbon matrix. The BET specific surface area varied from 400 to 1000 m2/g depending on the amount of K2CO3 added during the preparation. The redox peaks observed on the CV curves could be attributed to hydrated molybdenum oxides due to the slow oxidation of molybdenum carbides during the charge-discharge process. The pseudocapacitance resulted from the following Faradaic reactions of hydrated molybdenum oxides was superimposed on the double-layer capacitance of the carbon support, which increased the specific capacity. Parts of samples could still retain a high capacity (>150F/g) at a current density of 1A/g during the galvanostatic charge-discharge measurements, showing favorable electrochemical properties.
  • Study on Synthesis and Magnetic Propertie of NiCuZn Ferrite
    Bian-Fang ZHANG
    . 2011, 42(S4): 11-0.
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    NiCuZn ferrite powders were prepared by sol-gel method。The themal decomposition, phase composition, microstructure and the magnetic properties of NiCuZn ferrite were investigated by TG-DTA, XRD, SEM and VSM techniques. The results showed when reaction temperature is 303K NiCuZn ferrite powders with single spinel phase were formed after subsequent heat treating at 800℃，but if reaction temperature is 323K the powder is not pure spinal structure. Due to the presence of impurity particles, saturation magnetization and low temperature exchange bias field is reduced.
  • A review of nanocrystalline calcium phosphate scaffold in bone tissue engineering
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    . 2011, 42(S4): 12-0.
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    With the development of nanotechnology and biotechnology, many experts have fabricated a serial of novel bone scaffolds. To better understand the advantages of nano biomaterials and guide the preparation of novel bone materials, this review presents the recent advances of nanocrystalline calcium phosphate-related bone scaffold, especially on the preparation method, properties and application of nano calcium phosphate ceramics, calcium phosphate composite ceramics and nano calcium phosphate/ polymers composite, and summary the shortcomings and research direction of these methods.
  • Effect of Cu on the property of ferrite antibacterial stainless steel
    lingang LIN gang
    . 2011, 42(S4): 13-0.
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    The antibacterial properties, corrosion resistance and mechanical properties of 430 ferrite antibacterial stainless steel with different copper content were investigated through laboratory testing. The results show that antibacterial properties increases gradually with the increase of copper content for 430 ferrite antibacterial stainless steel slab after hot rolling, antibacterial heat treatment, cold rolling, and annealing heat treatment, and that more than 1.3% copper achieves the desired antibacterial effect. The pitting resistance and strength increase slightly with the increase of copper content, while the plasticity remained unchanged.
  • Preparation and characterization of starch microcellular foam particles crosslinked with glutaraldehyde using a solvent exchange technique
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    . 2011, 42(S4): 14-0.
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    Starch microcellular foam (SMCF) with high whiteness, certain water resistance capacity and microcellular on the surface, was prepared using native corn starch crosslinked with glutaraldehyde by solvent exchange technique. The effect of the factors of crosslinking reaction and solvent exchange on properties of SMCF was studied. Then, the optimal technological conditions were determined: crosslinker content 10g glutaraldehyde/100g starch, crosslinking temperature 50℃, crosslinking time 2h, ethanol solvent exchange method for three times. In addition, FT-IR analysis showed that the hydroxyl groups of SMCF crosslinked with glutaraldehyde were fewer than the original starch, while the methyl and methylene were increased. It was demonstrated that the crosslinking reaction belongs to etherification. The thermal stability of SMCF was studied by TGA measurement. The decomposition temperature of crosslinked SMCF was about 330℃, and its thermal stability was better than uncrosslinked SMCF.
  • Preparation and Characterization of Acrylate grafted polypropylene fiber for oil absorbing
    Shao-Ning LI
    . 2011, 42(S4): 15-0.
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    Abstract: The surface of polypropylene (PP) fiber was modified through grafting polymerization of butyl acrylate (BA) initiated by high energy ultraviolet (UV). The factors influenced the grafting degree of BA were discussed, such as the irradiation time, the concentration of monomer and photosensitizer. The original and grafted PP fibers were characterized by Fourier transform infrared (FT-IR) spectrometer and the results indicated that butyl acrylate was grafted onto the surface of PP fibers. With the increase of grafting degree, the adsorption capacity of grafted fiber using diesel fuel as the adsorbate increased first and then decreased. When the grafting degree was 15.5% the maximum oil-absorption capacity reached 18.3 g/g, while the oil-absorption capacity of PP fiber was only 11.5g/g. The adsorption rate for diesel oil was fast compared with acrylate resin.
  • Preparation of radar absorbing materials with broad bandwidth by mixing carbonyl iron and FeSiAl particles
    Yong-Gang XU ;;;
    . 2011, 42(S4): 16-0.
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    Abstract: In order to increase the absorbing ability in the lower band(1-4GHz) and expand the absorbing bandwidth, carbonyl iron and FeSiAl particles were established as absorbers, and wax as adhesive, and the electromagnetic parameters were tested by using a vector network analyzer, then the absorbing properties were calculated with a given thickness(0.5mm or 1mm). The results show that both the complex permittivity and permeability increase as the ratio of quality increase. And under the same ratio of quality, FeSiAl particles has excellent absorbing properties in low frequency band(-6.8~-1.2dB), while inferior to carbonyl iron(-16.0~-10.1dB) in high frequency band(14-18GHz). After mixing the two types of particles, the content of FeSiAl particles is adjusted, and a composite absorbers with good absorbing properties in low frequency band(-4.5~-1.1 dB) and wide absorbing bandwidth(less than -4 dB in 3.8-18GHz) is found. It has an instructive value to mix other excellent low frequency absorbers and high frequency absorbers to get materials in a wide absorbing band.
  • Structural and Optical Properties of Mn-Doped ZnO Thin Films by RF Magnetron Sputtering
    Chun-Yu MA
    . 2011, 42(S4): 17-0.
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    Using reactive RF magnetron sputtering, Zn1-xMnxO (0.00≤x≤0.25) thin films were deposited on Si (001) substrate and were annealed at different temperatures. The microstructural, surface morphological and optical properties of Zn1-xMnxO thin films were characterized by using X-ray diffraction (XRD), atomic force microscopy (AFM), transmission electron microscopy (TEM) and transmittance spectroscopy. The results indicate that all the films are strongly oriented along (002) orientation corresponding to the hexagonal wurtzite structure. The ZnMnO film at concentration x?0.07 of Mn is of high quality, uniform, and free of clustering/segregated phases. However, at x?0.13, ZnMnO3 (tetragonal) is observed as the secondary phase. For Zn1-xMnxO (x=0.07) thin films the optical band gap is found to be 3.17 eV for as-deposited and 3.27 eV for annealed at a high temperature. The as-deposited film is in a state of compressive stress and the stress can be largely relieved with annealing temperature of above 700℃.
  • Synthesis and characterization of quercetin and germanium complex modified by Fe3O4
    Jian-Guo Sheng;
    . 2011, 42(S4): 18-0.
    Abstract ( ) Knowledge map Save
    For preparation of the anticancer medicine which has magnetic and targeted effect, the quercetin and Germanium complex is prepared by quercetin and Germanium standard solution which served as raw materials reacted with each other under certain conditions．Then adding nano Fe3O4 that dispersed into ethanol solution. The temperature at 30℃and react 24 hours. The complex of quercetin and Germanium modified by Fe3O4 were studied by UV, IR Spectrophotometry and magnetometer. It may be form quercetin—Germanium complex in A and C ring of quercetin. Nano Fe3O4 and quercetin hydroxy connect by hydrogen bond, the complex of quercetin and Germanium modified by Fe3O4 measure by magnetometer,the complex have magnetic. The single crystal of complex of quercetin and Germanium modified by nano Fe3O4 may be monoclinic system, the powder one may be undefined structure.
  • The effect of pH value on nanocrystalline LaFeO3 prepared by solution combustion synthesis
    . 2011, 42(S4): 19-0.
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    Perovskite compound LaFeO3 was prepared by solution combustion synthesis using lanthanum nitrate and ferric nitrate as oxidants, citric acid as organic fuel and ammonia and NaOH solution as pH regulator. The effect of pH value of precursor solution on phase composition, crystallite size and morphology of LaFeO3 was investigated by using X-ray diffraction (XRD) and scanning electron microscope (SEM). The results showed that the pH regulator and the pH value of precursor solution had significant effect on the phase composition, crystallite size and morphology of LaFeO3. When the pH value of precursor solution was adjusted to 5, 7 and 9 by ammonia, pure phase LaFeO3 could be obtained by solution combustion method and had a crystallite size of 29.4、37.2 and 32.3 nm, respectively, while a mixture of amorphous phase and Fe2O3 was obtained at pH=13. In contrast to this，NaOH solution as pH regulator, pure phase LaFeO3 could be obtained in the pH range of 5 to 13, and the LaFeO3 nanocrystals prepared at pH=7 had a net-like porous structure with the largest crystallite size of 30.5 nm. However, under the acidic and basic conditions, the obtained LaFeO3 products were an aggregate of irregular particles.
  • Polyethylene glycol on the block Polyurethane solid - solid phase change material and performance analysis of the impact
    Gao Yi
    . 2011, 42(S4): 20-0.
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    The different molecular weight polyethylene glycol (PEG), 4,4'-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO) as raw materials, two-step synthesis of a series of polyurethane type of material. By thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR) to determine its chemical composition, by polarized light microscopy (POM), X-ray diffraction (XRD) carried out morphological structure of the analysis. At the same time, changes in the share of PEG content in the material are a series of materials, use of differential scanning calorimetry (DSC) was found with PEG molecular weight increases, increased material enthalpy, phase change temperature rise high. Study found that the phase transition behavior of PEG content lower than 91% share, the material was solid-solid phase transition, the phase transition to crystalline-amorphous to a phase transition, and with polyethylene content increased, the enthalpy increases, the hardness decreased, tensile strength increased.
  • The preparation of porous Si3N4 ceramic material for radome application
    Jie Xu ;;Xiao-Lei SUhe xinhai;
    . 2011, 42(S4): 21-0.
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    The low-density silicon nitride ceramics with global macro-pores were prepared by adding pore-forming agent through reactive sintering technique. The effects of pore and processing of reaction on the properties of porous silicon nitride ceramics were investigated. The experimental results show that the porosity of samples with 40wt% pore-forming agent increase visibly compared to the samples with no pore-forming agent, which leads to the decrease in the dielectric constant and loss in the sample. Adding of the global macro-pores can promote the formation of needle-like phase and decrease the partial overheating of green compacts to avoid silicon fusion. The α-Si3N4 phase increases and the needle-like phase decrease with the decrease of heating-rate. It is found that the free silicon in the ceramics is oxidized and leads to the decrease in the dielectric constant and loss when the sintered compacts are heat-treated in air.
  • Optimization of Mg2Si by Doping the Rare Earth Elements
    Liqi Wang
    . 2011, 42(S4): 22-0.
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    The rare earth elements(Sc,Y) doped Mg2Si based thermoelectric materials were prepared by Field-Activated and Pressure-Assisted Synthesis(FAPAS).The samples by this method own uniform and compact sthucture, the average grain size was about1.5~2μm, micro-content of rare earth element did not change the morphology of matrix. The two dopants enhanced the thermoelectric properties at varying degrees, the power factor of samples doped with 0.427mol%Sc and 0.173mol%Y were 2.67 times and 2.03 times of that of non-doped Mg2Si at 378K and 468K respectively, and the thermal conductivity of the latter reduced by 20%. Thus, the figure of merit ZT of 0.173mol%Y doping sample reaches to 1.30 times of the pure Mg2Si, its ZTmax -0.23, obviously higher than 0.18 belonging to the latter.
  • Optimum Design of the Gas Nitriding Technological Parameters of H13 Steel
    Hui JU;;
    . 2011, 42(S4): 23-0.
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    The gas nitriding technology of H13 steel was studied by an orthogonal test. For obtaining high surface hardness and great thickness, the main factors which affect the nitriding layer structure and properties were analyzed, and the optimized parameters were obtained. The microstructure of the nitriding layer of H13 tool steel after gas nitriding were studied by OM and X—Ray, the surface hardness of samples were measured by microhardness tester. The results show that the main parameters of nitridation process which affect the surface hardness and nitrided case depth are nitriding temperature and decomposition rate of ammonia. The maximum thickness of nitride layer and microhardness are 244.3μm and 1212.6HV respectively. The optimum technical parameters are that tempering temperature before nitriding, nitriding temperature, time, and decomposition rate of ammonia are 560℃, 535℃, 15h, 50%, respectively.
  • Influence of extrusion process on mechanical and damping capacities of Mg-0.6Zr-0.5Y alloy
    . 2011, 42(S4): 24-0.
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    The influence of extrusion temperature and extrusion ratio on mechanical capacity and damping capacity of Mg-0.6Zr-0.5Y alloy was investigated in this paper. The microstructure, mechanical capacity and damping capacity of Mg-0.6Zr-0.5Y alloy were studied by using the metallographic microscope, universal testing machine and dynamic mechanical analyzer (DMA). The relationship between the grain refinement and the mechanical, damping mechanism were also discussed. The results show that the dynamic recrystallization occurred during hot extrusion process, and significant grain refinement improved the mechanical property of the investigated alloys. Damping capacity of the as-cast alloy is maximum, and it decreased significantly by extrusion process. With the extrusion temperature decreased, extrusion ratio increased, the damping capacity decreased gradually. The influences of different extrusion process on damping properties can be explained by the G-L theory.
  • Preparation and properties of Functional Polyurethane Foam used to Separate Proteins
    He Li Li ;
    . 2011, 42(S4): 25-0.
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    A kind of functional polyurethane foam was prepared by means of modified PAM, TDI and polyether as main materials by one step bubble method. The production was characterized by scanning electron microscopy（SEM）and Fourier transform infrared spectroscopy(FTIR). The foam was used to separate the proteins mixture (Lys and BSA). The results show that when the formula of functional polyurethane foam is as follows: the mass ratio among polyether, TDI, PAM, acetone, TEDA, DBTDL, Si and H2O, is 100 :150 :25 :20 :0.6 :0.4 :1 :0.1, the foam’s swelling capacity and the solution-loss rate in water is measured to be 18% and 0.036%,respectively. The foam has acylamide, and can separate the mixed proteins well.
  • Preparation of Poly[poly(ethylene glycol) diacrylate] Microshperes by Dispersion Polymerization in Polysaccharide Solution
    Guo-xin TAN ;Ning Chengyun;
    . 2011, 42(S4): 26-0.
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    The hydrogel microshperes of poly[poly(ethylene glycol) diacrylate] were synthesized by dispersion polymerization in chitosan solution, with ammonium persulphate (APS) as initiator, N,N'-methylene-bis-acrylamide (BIS) as cross-linker, and polyvinylpyrrolidone（PVP） as dispersing agent. The composition and micro-morphology of microshperes were characterized by infrared spectrum analysis (FT-IR) and Scanning Electronic Microscopy (SEM), respectively. The effects of reaction time, reaction temperature, amount of KCl and amount of dispersing agent on the size of microshperes were investigated in this paper. The results showed that micron-sized hydrogel microshperes with good dispersity could be obtained with optimum conditions of: 24H, 70℃, 2% PVP and 20%KCl to monomer.
  • Study on the Preparation of one new Type oil-absorbent Fiber and Oil Absorptive Properties
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    . 2011, 42(S4): 27-0.
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    This experiment uses the Suspension Polymerization, under the dual oxidation-reduction system of H2O2-xanthate and H2O2-FeSO4 initiating, the lipophilic- monomer of BMA is grafted on the frame of cotton fiber which prepares absorbing oil fiber. It has proved that the layer of BMA is existed by the observing of SEM, and makes the experiment of adsorbing to floating oil in solution for the absorbing oil fiber. In this paper, it studies the effect of grafting ratio, pH of solution, temperature and time on the absorbing ability of the absorbing oil fiber. It shows that the absorbing ability of oil absorbent fiber is increased rapidly then decreased slowly with increasing of grafting ratio, when the grafting ratio is 147%, the absorbing oil ability is the strongest, oil absorption is 6.75g/g; The effect of pH, temperature and time on the absorbing oil fiber presents gradually increasing, but the increasing extent decreases successively. Using petroleum ether to extract the floating oil of the absorbing oil fiber who adsorbs, and the desorption rate of floating oil is up 90%; After desorbing and regenerating, the oil absorbent fiber still has a strong ability of adsorbing and could be used repeatedly many times.
  • Influence of Concentration of Phytic Acid on Conversion Coating on AZ91D Magnesium Alloy
    chen yan kun
    . 2011, 42(S4): 28-0.
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    Abstract: AZ91D magnesium alloy was selected as the matrix metal. SEM、EDS、spot test、Tafel and EIS were adopted to investigate the influence of concentration of pytic acid on appearance、component and corrosion resistance of conversion coatings. Results show that the pytic acid conversion coating mainly contains Mg、Al、O、P and C. The content of Mg increases as the concentration of pytic acid increases, while the content of P is the other. The cracks in conversion coating have barely influence on its corrosion resistance. And the difference of component and structure of conversion coating mainly influence its anodic dynamical mechanism.
  • Dye-Sensitized Solar Cells with TiO2 Nanoparticle/Nanowire Composites Photoanode
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    . 2011, 42(S4): 29-0.
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    TiO2 nanowires powder were synthesized by hydrothermal method. Tetrabutyl titanate sol was prepared from sol-gel process. Gel slurry was formated by Tetrabutyl titanate sol mixing with TiO2 nanowires powder. The composites photoanode of TiO2 nanoparticles and TiO2 nanowires were prepared on transparent conductive fluorine-doped tin oxide (FTO) substrates by dip-coating method. The structure and morphology characteristics of TiO2 nanowires powder and composites photoanode have been analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM). The effect of the relative nanowire/nanoparticle ratio on the performance of solar cells were systematically investigated by I-V curves and electrochemical impedance spectroscope. The results shows that the short-circuit current density and light-to-electricity efficiency of DSSCs obviously increas, open-circuit voltage and fill factor basically maintain constant, the impedance of electron transfer decrease, electron lifetime in the photoanode lengthen, with increasing of TiO2 nanowires in composites photoanode.
  • Synthesis and characterization of phosphorus-containing flame retardant BPAODOPE
    Bing LIANG;;
    . 2011, 42(S4): 30-0.
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    A novel phosphorus-containing flame retardant BPAODOPE was synthesized by the reaction of 10-(2,5-Dihydroxyphenyl)-10H-9-oxa-10-phosphaphenantbrene-10- oxide (ODOPB) and Trimellitic anhydride acid chloride(TMAC). The chemical structure of the obtained compound was identified by FT-IR and 1H NMR. The optimum reaction conditions were determined as follows: In nitrogen atmosphere, the mole ratio of ODOPB and TMAC is 1:3, 60ml dry toluene as solvent, reaction temperature is 110℃, the reaction time is 6 hours, and the dosage of catalyst is 0.5ml. And the thermal stability of BPAODOPE was tested by TGA.
  • Synthesis and photocatalytic property of a Ag doped ZnO/ZnSnO3 composite photocatalyst
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    . 2011, 42(S4): 31-0.
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    The ZnO, ZnSnO3, ZnO/ZnSnO3 and Ag/ZnO/ZnSnO3 catalysts were fabricated by precipitation-calcination combination with photodeposited method. The as-synthesized photocatalysts were characterized by X-ray diffraction (XRD), scan electron microscopy (SEM), UV-vis reflectance (UV-vis), and X-ray fluorescence spectroscopy. The results show that all the prepared samples have good crystallinity. The pure ZnSnO3 with perovskite structure was synthesized. The ZnO, ZnSnO3 and ZnO/ZnSnO3 almost show the same right absorption property. The presence of metal silver caused a red shift in the absorption edge. The photooxidation activity of the samples was evaluated by photocatalytic decolorization of acid orange II under UV light (λ=365 nm) irradiation. The photocatalytic activities were described as the order: ZnSnO3＜ZnO＜ZnO/ZnSnO3＜Ag/ZnO/ZnSnO3.The dual-and tri- composite catalysts show the high photocatalytic acitivity, which is mainly attributed to the formation of heterojunction and the presence of metal Ag could decrease the recombination rate of the e-/h+ pairs, hence promoting the photocatalytic activity.
  • Effects of fabrication process on the microstructure of in-situ Al3Ti/Al composites
    . 2011, 42(S4): 32-0.
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    In-situ Al3Ti/Al composites were fabricated by direct melt reaction method in Al-Ti system.The effects of fabrication process on microstructure of the in-situ Al3Ti/Al composites with different fabrication parameters such as reaction temperature, rare earth element Ce and casting temperature were investigated by XRD,SEM and EDS. The variation of the shape and size of Al3Ti phase and the mechanism were studied in the present paper.The results show that the higher reaction temperature,the faster Al3Ti grow up and more homogeneous . The size of Al3Ti become smaller as the casting temperature decline and after adding Ce. When the parameters for fabricating Al3Ti/Al composites are that reaction temperature is 900℃ and casting temperature is 900℃.The reinforced particles are approximately 10μm and the morphology of reinforced particles is small blocky or short rod-like. The in-situ formed Al3Ti particulates are homogeneous dispersion in the centres of Al grain.
  • Preparation and Study of Dielectric Material—— the Film of Parylene F
    . 2011, 42(S4): 33-0.
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    In this paper, a new dielectric material—the film of parylene F was prepared through the method of Chemical Vapor Deposition(CVD). The surface morphology of film was characterized by SEM and AFM. The composition and performance of the film was tested by IR、XPS and DSC. The results show that the film of parylene F was a kind of dielectric material with potential value in application.
  • Experimental study on the stability and viscosity of Cu-Water nanofluids
    ;
    . 2011, 42(S4): 34-0.
    Abstract ( ) Knowledge map Save
    ABSTRACT: In this article, the stability and viscosity of the Cu-Water nano-fluids, with different mass faction of particles including 0.1%、0.5% and 1%, prepared by the two-step method were investigated and compared with the results derived from classical two-phase mixture models. The result shows that the incorporation of the SDBS dispersant can significantly improves the viscosity of Cu-water nanofluids. Moreover, there is an optimal stability when the mass fraction of Cu particles is the same as the concentration of SDBS dispersant. The viscosity of the nanofluids increases with the increase of the mass fraction of the Cu particles. However, there is a deviation between the experimental data and the calculation from the formula due to the only consideration of the effect of the mass fraction of particles on the viscosity according to the theoretical models.
  • Preparation and Characterization of High Strength Carrageenan Fibers
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    . 2011, 42(S4): 35-0.
    Abstract ( ) Knowledge map Save
    Modified carrageenan was prepared by carrageenan cross-linked with epoxy chloropropane. Then the modified carrageenan went through wet-spinning frame to get the high strength carrageenan fibers. The composition of carrageenan and modified fibers were characterized by FT-IR. The viscosity was investigated by viscometer. The range of influencing factors was investigated by experiments of single factor. The optimum synthesis condition of the crosslinking was obtained by orthogonal experiments.The results showed that the reaction temperature was 90℃, the amount of crosslinking agent added was 6.25%, the reaction time was 2.0h and the pH value was 10.0. The mechnical property of the modified/ unmodified carrageenan fibers were investigated with strength tester. The breaking strength of the former is 3.99cN/tex, compared with the latter 2.17cN/tex.
  • Fabrication of Surface texture on Ti6Al4V alloy and its wettability
    . 2011, 42(S4): 36-0.
    Abstract ( ) Knowledge map Save
    Surface texture of line texture、grid texture and space-lattice was manufactured to Ti6Al4V alloy with laser surface modification method and self-assembled monolayers (SAMs) was deposited on the texturing surface with self-assembled method. Scanning electron microscope, surface profiler and contact angle measurement were used to analyze the surface properties of specimen. It is shown that after laser manufacturing and preparing self-assembled monolayers, the contact angles of the water droplet on the surface increased significantly, and the contact angles of the water droplet on the specimens with line texture can attain to 124.8°, on the specimens with grid texture can attain to 126.1°, on the specimens with space-lattice can attain to 151.6°. The contact angle bears directly upon the surface roughness. The contact angle tends to bigger as the increment of the surface roughness. When the roughness is over 4μm, all of the contact angles are bigger than 150°, it means that a super-hydrophobic surface has formed.
  • Preparation and Gas sensing Properties of Flower-Like and Tetrapod-Like Zinc Oxide by Combustion Technology
    Huo Yong qian
    . 2011, 42(S4): 37-0.
    Abstract ( ) Knowledge map Save
    Abstract: This paper dealt with the preparing conditions and morphology of flower-like, tetrapod-like and amorphous zinc oxide whiskers, which were prepared by oxidation of zinc metal in the air and by introducing active carbon as a reaction catalyst. The product was pure zinc oxide verified by XRD patterns of ZnO whisker, in which the peaks are sharp with narrow half-widths and can be identified as a wurtzite ZnO structure. Morphology of ZnO whiskers was affected greatly by carbon black usage and the reaction temperature. The possible growth mechanisms on the ZnO nano-whiskers were proposed in this paper. The gas sensing properties of the ZnO layers were tested with CH3OH, C2H5OH, CH3COCH3 and n-C3H7OH, respectively. The ZnO sensors show typical n-type metal oxide semiconductor behavior, the resistance decreases as the gases are increased. The sensors has a higher sensitivity to n-C3H7OH than the sensitivity to other gases. The zinc oxide sensor has higher gas response values and a fast response.
  • Preparation of Si80Ge20B0.6 Alloy by Spark Plasma Sintering and Their Thermoelectric Properties
    Ran Zhao;;;;
    . 2011, 42(S4): 38-0.
    Abstract ( ) Knowledge map Save
    Single-phase Si80Ge20B0.6 alloy bulks were prepared by high-energy ball milling followed by spark plasma sintering method. The thermoelectric properties were measured from 400 K to 900 K. The carriers were scattered by grain boundaries in the alloys prepared by powder metallurgy. The bulk specimens heated for a longer period of time during SPS had higher electric conductivity. The thermal conductivity values for all specimens were between 2.7 W/mK to 4.5 W/mK. The figure of merit ZT of the holding for 9 min specimen reached 0.47 at 900 K.
  • The preparation and the high-temperature properties of 3D Cf/SiC composite material by PIP process
    . 2011, 42(S4): 39-0.
    Abstract ( ) Knowledge map Save
    Cf/SiC composite material is one of the most promising candidates to substitute superalloy, which has been used in current aeronautic engine components working under high-temperature for decades. Towards the requirements of these high temperature components, we successfully prepared 3D Cf/SiC composite material via PIP process with a low density of 1.83 g/cm3. Subsequently, mechanical tests of this material including flexural properties and tensile creep were carried out at a typical engine working temperature of 1200 degree. In our test of flexural properties, a flexural strength (?b1200) of 712 MPa was obtained， which is higher than the value of the same material measured at room temperature (?bRT = 641 MPa). This may be due to the deforming of carbon fiber occurred during the cooling process of the material. Furthermore, according to the obtained creep curve at the temperature of 1200 degree and the constant stress of 120 MPa, a creep rate of 2.08?10-3%/h was calculated, which agrees well with the creep rate of 3D Cf/SiC composite material prepared by CVI process measured under the similar conditions.
  • Removal of Formaldehyde from Aqueous Solutions using TiO2 Immobilized on Bamboo Activated Carbon
    ;DAN-dan CUI
    . 2011, 42(S4): 40-0.
    Abstract ( ) Knowledge map Save
    A composite of TiO2 and bamboo activated carbon was achieved through sol-gel method and its removal of formaldehyde was evaluated. Removal rate of formaldehyde with different pre-adsorbing time, initial concentrations and different catalyst dosages over the composite was investigated. It was shown that the prepared composite photocatalyst remove formaldehyde from aqueous solution distinctly: when the dosage is 1.0g, 800mL initial concentration of 5mg / L aqueous solution of formaldehyde, after 1h pre-adsorbing and then exposure in 17w UV-light, the formaldehyde removal rate is up to 95.96% at 480min. The kinetic analysis shows that photocatalytic rates were well described by the Langmuir–Hinshelwood model. The apparent first-order reaction coefficient of photocatalysis with low concentration is higher than that with high concentration formaldehyde. More composite showed higher reaction coefficient than the less one in certain extent, and too much composite hindered the photocatalysis owing to the lower light transmittance.
  • Different Morphologies of PbS Materials Synthesized Via Microwave Method
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    . 2011, 42(S4): 41-0.
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    PbS crystals with star-shaped and flower-like structures were synthesized using different raw materials and solvents though microwave method. The impact of the addition of CTAB on the morphologies of the samples was investigated under unchangeable heating power.The compositions and morphologies of the samples were characterized by X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscope (FESEM).The results showed that when adding an appropriate amount of CTAB, PbS crystals with perfect star-shaped and flower-like structures were formed; while without CTAB, the flower-like and integrated star-shaped structures of PbS can not be found; when cut the amount of CTAB by half, neither star-shaped structure nor flower-like structure were synthesized, but there was a trend that may lead to the mentioned structures. Furthermore, through the analysis of reaction processes, the formation mechanisms of PbS crystals with star-shaped and flower-like structures were discussed.
  • Synthesis and characterization of collagen modified poly(DL-lactic acid)
    . 2011, 42(S4): 42-0.
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    In this study, collagen-modified poly (L-lactic acid) (PLLA) was synthesized by introducing collagen into poly(DL-lactic acid) (PLA)．FT-IR, FITC fluorescence labeling method and ninhydrin reaction was used to characterize collagen-modified poly (DL-lactic acid). The results reveal that collagen can be incorporated into the side chain of PLLA bv means of the said synthesis method. The measurement of water contact angle and water absorption ratio of collagen-modified PLLA indicated that the hydrophilicity of collagen-modified PLLA was better than that of PLLA.
  • Preparation and Tribological Properties of Stearic Acid modified LaPO4 and Ce/LaPO4 Nanoparticles
    Qian NIE
    . 2011, 42(S4): 43-0.
    Abstract ( ) Knowledge map Save
    Stearic acid modified LaPO4 and Ce/LaPO4 nanoparticles were synthesized by precipitation method. The morphology and structure of nanoparticles were investigated by infrared spectroscopy(IR), X-ray diffraction(XRD) and transmission electron microscopy(TEM). The Dispersibility and stability of nanoparticles additives in solvent were studied. The tribological properties of modified LaPO4 and Ce/LaPO4 nanoparticles were investigated by four-ball machine. Results showed that Stearic acid modified LaPO4 and Ce/ LaPO4 nanoparticles average size 10nm, and the modified nanoparticles exhibit good dispersion in organic solvents. The wear resistance and load-carrying capacity of the liquid paraffin with nanoparticles added were improved in comparison with the liquid paraffin. When the stearic acid modified LaPO4 and Ce/ LaPO4 nanoparticles were added into liquid paraffin, the PB value of the oil sample could be increased by 0.75 and 1.1 time, the wear scar diameter of steel ball could be reduced by 41% and 49% .
  • Compared study of the effects of water bath, the microwave irradiation and the Ultrasound irradiation on the formation of monodispersed MF spheres
    . 2011, 42(S4): 44-0.
    Abstract ( ) Knowledge map Save
    Three different reaction inducing methods, namely the water bath, the microwave irradiation and the Ultrasound irradiation, have been applied to the polymerization of melamine and formaldehyde for the formation of Melamine formaldehyde (MF) spheres. The morphology and the size distribution of the spheres derived from the three different methods have been compared and analyzed. It has been demonstrated that the microwave irradiation and the ultrasound irradiation can induce the polymerization of the intermediate promptly and influence the solubility of the MF spheres in the chloride acid. The influences of the intermediate concentration, the PH value, the dispersant, the reaction temperature and the reaction time on the spheres size and the size distribution have also been studied.
  • Preparation and characterization of SDBS modified carbon nanotubes and poly(L-lacitde) composite reinforced by the SDBS/carbon nanotubes
    Zhi-Guo LI;;;;
    . 2011, 42(S4): 45-0.
    Abstract ( ) Knowledge map Save
    The surface of carbon nanotubes (multi-walled carbon nanotubes as used, MWCNTs) are modified by sodium lauryl benzenesulfate (SDBS) and the composites combined with poly(L-lacitde)(PLLA) and modified MWCNTs as reinforcing fillers are fabricated by the solution casting method. The morphologies and structures of the modified MWCNTs are studied by FT-IR and SEM. The chain structure, aggregation structure and the mechanical properties of the composites are analyzed by FT-IR, PM and tensile testing. The SDBS layers improve the dispersion of MWCNTs in organic solvent and PLLA matrix and strengthen the interfacial adhesion between MWCNTs and PLLA, resulting the tensile strength of SDBS/MWCNTs/PLLA composites increased.
  • Sol-Gel Preparation of Visible-Light-Driven N-Halogen-Codoped TiO2 Photocatalysts
    Yong-Gang SHENG;;;
    . 2011, 42(S4): 46-0.
    Abstract ( ) Knowledge map Save
    Using a facile sol-gel method, TiO2 photocatalysts, T5100-C, T5100-B, and T5100-I, were prepared through a direct reaction between nanocrystalline anatase TiO2 sol and cetyltrimethylammonium chloride, cetyltrimethylammonium bromide and cetyltrimethylammonium iodide. The results of X-ray photoelectron spectroscopy (XPS) showed successful codoping only for sample, T5100-B, which N and Br atoms were substituted for lattice oxygen of TiO2. In contrast to other two samples, T5100-B could more readily photodegrade methylene blue (MB) under visible light irradiation. The visible-light catalytic activity of thus-prepared T5100-B resulted from the synergetic effect of the doped nitrogen and bromine, which not only gave high absorbance in the visible light range, but also reduced electron-hole recombination rate.
  • Study on the technologies of tetragonal barium titanate films prepared by Micro-arc Oxidation
    ;;Wenbo Huang
    . 2011, 42(S4): 47-0.
    Abstract ( ) Knowledge map Save
    In this paper, the laws of technological parameters for tetragonal barium titanate films by Micro-arc Oxidation were studied.Micro-arc Oxidation was conducted by placing Ti plates into the electrolytes containing Ba2+ in the region of which concentrations were between 0.15M and 0.55M and currents were between 1.0A and 5.5A.It turned out that Micro-arc only occurred in some concentration-current region which can be directly indicated by plane graph, and morphologies were different in various concentration-current zones. Concentration-current region was subdivided into several zones on the basis of different morphologies.the laws of technological parameters that can prepare flat and evenly fims were obtained by studying the morphologies corresponding to different various concentration-current zones,Bigger currents were choosen before Electric breakdown was happened and higher concentrations were choosen in the rgion of solubilities.The tetragonal barium titanate films were prepared in electrolytes containing Ba2+ of 05M at 3.0A based on the presented laws. The results demonstrate that the films were mainly composed of BaTiO3 phase, Dielectric constant of 113 was measured at frequency of 1kHz.
  • Preparation and Photocatalysis of TiO2/Fly-Ash Nanocomposite
    ;;;Sheng-Yi ZHANG ;;
    . 2011, 42(S4): 48-0.
    Abstract ( ) Knowledge map Save
    The TiO2/fly-ash nanocomposite, a novel photocatalyst, was prepared by an ultrasound hydrothermal synthesis at mild temperature, to improve the photocatalytic activity of TiO2 and make it reused easily. The products as-prepared were characterized by scanning electron microscopy (SEM), X-ray diffraction(XRD), IR and UV-Vis spectral analysis. The effect of TiO2 amount and ultrasound time on the morphology, crystal and property of the product was studied. Taking methylene blue (MB) as model, the photocatalysis performance of the photocatalysts was observed. The results show that the photocatalytic activity of the TiO2/fly-ash nanocomposite is higher than that of pure TiO2, due to the interaction between TiO2 and fly-ash.
  • Hot-deformed Nd-Fe-B magnets with high magnetic properties prepared by spark plasma sintering technique
    Yilong Ma;;LI Chao-ying ;;
    . 2011, 42(S4): 49-0.
    Abstract ( ) Knowledge map Save
    Isotropic bulk magnets were obtained by hot-pressing the melt-spun Nd13.5Fe80.5B6 ribbons within several minutes using spark plasma sintering technique and the magnetic properties ( remenance, coercivity and maximum magnetic energy product) were: Br=0.8T, Hci=1346kA/m, (BH)m =108 kJ/m3. With the increasing height reduction ratio, the degree of c-axis texture increased for hot-deformed magnets; Br and (BH)m increased largely and reached their maximum at 65% of height reduction ritio: Br=1.41T, 342kJ/m3; the microstructure revealed that round grains of hot-pressed magnets with a diameter of 100nm grew to platelet-like grains with a length of 400-600nm and a thickness of 100-150nm after hot-deformation. When the height reduction ratio increased to 73%, the magnetic properties decreased due to the formation of plenty of coarse grains.
  • Preparation and antibacterial activity determination of Chitosan Derivatives
    . 2011, 42(S4): 50-0.
    Abstract ( ) Knowledge map Save
    The chitosan derivatives were improved in preparation method and characterized by FTIR spectrum analysis. The bacteriostasis, stability, dissolubility, pH and other properties of the chitosan derivatives were investigated. The experimental results indicated that the dissolubility and stability of the chitosan derivatives prepared by the improved method were prominently enhanced. Two kinds of the chitosan derivatives at the concentration of 0.1% (w/v) showed obvious bacteriostatic activities on Esherichia coli and Staphylococcus aureus. Their growths were terminated when the concentration reached 0.2% (w/v). The bacteriostatic activity of high molecular weight (Mw) chitosan derivative is higher on gram positive microbes while that of low Mw chitosan derivative is higher on gram negative bacteria.
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