15 November 2013, Volume 44 Issue 21
    

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    工艺 技术
  • Synthesis and Photoluminescence properties of single crystal ZnO nanowires by Thermal evaporation
    Yan Yang;Lan-Jian ZHUGE ;;;;WU Xuemei
    . 2013, 44(21): 1-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    　We demonstrate that single crystal ZnO nanowires with high density and large length/diameter ratio are successfully grown on Si (100) substrates at a series of growth temperatures, via simple and catalyst-free thermal evaporation. The structural and photoluminescence properties of the resulting samples are characterized using x-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), and photoluminescence (PL), respectively. The XRD and TEM investigations indicate that the resulting ZnO nanowires are single crystalline grown along the c-axis direction in preference with the hexagonal wurtzite phase; SEM results show that the growth temperature has an effect on the morphology and the length/diameter ratio of the resulting ZnO nanowires. 700℃ is believed to be the optimized growth temperature among the series of temperatures, and the ZnO nanowire of which possesses the largest length/diameter ratio estimated about 300 (15um /50 nm). Moreover, the room temperature PL measurements for the as-prepared ZnO nanowires exhibit two emission bands including a sharp and strong UV emission and a broad and week blue emission. The VS mechanism based deposition method in our experiment can be applied to large-scale manufacture of high-purity single crystal ZnO nanowires.
    • 研究 开发
  • Effect of BF Mass Fraction on Properties of BF Reinforced Polylactic Acid Composites
    ZHENG Xia ;
    . 2013, 44(21): 2-0.
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    Bamboo fiber reinforced polylactic acid composites was prepared by injection molding technology with polylactic acid and the bamboo fiber modified with 1.5% isocyanate (MDI) interfacial modifier. Effect of BF mass fraction on Interface，mechanical property , water absorption and thermal property of composites were investigated. The results showed that tensile strength, impact strength, storage modulus and thermal stability of composites first increased and then decreased with increase of BF mass fraction, 24h water absorption gradually increased, loss factor gradually increased. When BF mass fraction was 50%, tensile strength and impact strength of composites arrived the maximum of 63.2MPa and 11.6 KJ/m2, respectively, composites presented the highest storage modulus and the best the thermal stability.
  • Study on Drug Releasing Properties of porous P(NIPAm-co-AAm) hydrogels
    . 2013, 44(21): 3-0.
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    Porous poly(N-isopropylamide-co-acrylamide) [P(NIPAm-co-AAm)] hydrogels were prepared by freezing polymerization method. With Bovine serum albumin (BSA) as the model drug, it was loaded into porous P (NIPAm-co-AAm) hydrogel by post-fabrication encapsulation technique. The loading efficiency and release ratio of model drug were investigated. The influence of different dry processing method on the controlled drug release properties of the drug-loaded hydrogel was also studied. The results showed that creating an interconnecting pore structure within the hydrogel matrices is an effective strategy to improve the drug loading efficiency and the cumulative released amount. In vitro BSA release from the hydrogels exhibited that dry processing method play a dominant role in the controlled drug release properties of P(NIPAm-co-AAm) hydrogel. The drug-loaded hydrogel with the refrigerator freeze-drying treatment showed well sustained drug release of protein drugs.
  • Study of Two-Stage Hydrothermal Growth of Branched ZnO Nanostructures
    ;;;
    . 2013, 44(21): 4-0.
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    Branched ZnO nanostructures with different morphologies have been synthesized successfully by introducing a two-step hydrothermal process. First, ZnO nanorods were prepared on Si substrate using Au layer to assist the growth; second, ZnO nanowires were synthesized on the sidewall of first grown ZnO nanorods with thermal decomposed ZnO nanoparticulars as seed layer. SEM and XRD have been applied for the characterization of the morphology and microstructures of ZnO nanostructures. It is found that ZnO nanorods grown on Au/Si substrate showed a typical wurtzite structure with a (103) preferred orientation, and the seed layer is crucial for the growth of branched ZnO nanostructures. The diameter of second grown ZnO nanowires decreased with decreasing the content of solution; and their lengths increased with the growth time. It is also proved that the branched ZnO nanostructures are biocompatible and can be used as cell scaffold.
  • Research of the preparation technic and magnetic properties of Mn2-xFexP1-yGey magneto-caloric materials
    ; zhang jiuxing
    . 2013, 44(21): 5-0.
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    Mn2-xFexP1-yGey（x=0.8、0.9，y=0.2、0.24、0.26）magneto-caloric compounds have been prepared by mechanical alloying (MA) and subsequent spark plasma sintering(SPS) technique. XRD, neutron diffraction and SEM were used to analysis the influences of the ball milling time, sintering temperature, pressure and time on the phase formation systematically. A stable preparation technique for the MnFePGe magneto-caloric materials was established. It was found that the quantity of the impurity decreased as the temperature increasing. The magnetic phase transition process and magnetocaloric properties of the Mn2-xFexP1-yGey alloys were investigated by DSC and SQUID. The compound Mn1.2Fe0.8P0.74Ge0.26 is expected to be a suitable candidate for a magnetic refrigeration applications with a small thermal hysteresis (3K), a Curie temperature close to room temperature (277.4K), and a large magnetocaloric effect (ΔSDSC = 21.5 J/kg K).
  • Fabricated Titania Nanotube Arrays in Electrolyte with Different pH value and Its Photoelectronic
    . 2013, 44(21): 6-0.
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    In this paper, the effect of the electrolyte’s pH value on the microcosmic images of the titania nanotube arrays was studied. The results indicate that titania nanotube arrays with more regular tube array structure usually formed in electrolyte with pH value 3-5. Current-voltage (I-V), transient photocurrents (I-t) and electrochemical impedance spectroscopy (EIS) were measured to test the photoelectronic and the electrochemistry performance of TiO2 nanotube arrays. The results indicate that the titania nanotube arryas has good photoelectronic and electrochemistry performance after heat-treated, and appears obvious electrochemistry character with high frequency resistance and low frequency capacitance.
  • TEG-Assisted Liquid-Phase Rapid Synthesis of LiFePO4/C Nanocomposites with High-Rate Performace
    ;
    . 2013, 44(21): 7-0.
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    The precursor contained element of Li、Fe、P was synthesized in the Triethylene glycol (TEG)/H2O system under ambient pressure and 108℃ during a short time. The XRD and SEM results show that: the obtained precursor belonged to amorphous structure, and LiFePO4/C nanocomposites was obtained by sintering at 600℃ with a certain amount of glucose under inert atmosphere for 3 h. Electrochemical tests showed that the special capacity of nanometer LiFePO4/C at discharge rates of 0.2 was 156.3 mAhg-1 and has the better discharge platform. A capacity of 133.9mAhg-1 at 5 C and 109.9mAhg-1 at 10 C was even achievable, with no significant capacity fading after 200 cycles. Show excellent rate discharge characteristics and cycle performance.
  • Study on modulation structure and superconductivity of Bi-Sr-Cu-O system doped with Ca
    Ben-Zhe SUN;yang qi
    . 2013, 44(21): 8-0.
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    A series of samples with the nominal composition of Bi2Sr2-xCaxCuO6+? (x = 0.1, 0.3, 0.5, 0.7, 0.9) are prepared by sol-gel method. By means of XRD, TEM and standard four-probe technique, it was investigated that the effects of Ca doping on lattice types and parameters of Bi-2201 phase, the incommensurate modulation structure and the onset temperature of superconducting critical transition (Tc,onset). It was found that Bi-2201 phase with orthorhombic symmetry can be maintained with the introduction of Ca2+ in the whole doping range. With increasing x, lattice parameter c is decreasing gradually. When x > 0.3, the b* component of the modulation wave vector is decreasing while the c* component is increasing with increasing x. Experimental R-T curves show that Tc,onset is the highest when x = 0.3, and then has a declining trend with increasing x, which is in agreement with the variation of the b* component of the modulation wave vector and can be interpreted by the crystal misfit model.
    • 综述 进展
  • Research progress in decellularized matrix material for tissue engineering
    ; ;;;
    . 2013, 44(21): 9-0.
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    Extracellular matrix (ECM) plays an important role in regulation of stem cell differentiation and in induction of reconstruction of new tissue and organ. To obtain the acellular matrix materials from different sources by different decellularized methods in vitro and study the application of them in tissue engineering are significant to the theoretical research and clinical application. This study summarized the methods of decellularized matrix material from different sources. Its role in the induction of stem cell differentiation and tissue repair process was also analyzed. Finally, the current problems and challenges in the acellular of matrix material were discussed.
  • The preparation and application of graphene
    Zhen-Feng ZHUSha Cheng;
    . 2013, 44(21): 10-0.
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    Graphene has attracted tremendous attention from researchers due to its excellent electrical, thermal, mechanical properties, as well as high optical transparency and large specific surface area, etc. Especially in 2004, stable graphene was successfully gained, it leads to a high tide for the research. To get the graphene which is low cost, large area, high quality and can be applied to practical production is the aim of the researchers. This paper reviews some modified or new preparation methods of the graphene and its potential applications in recent years, from which we can see the huge development potential of the graphene.
  • Review of characterization methods of graphene
    ;;;zhang dong
    . 2013, 44(21): 11-0.
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    The thickness of the single layer graphene is 0.335 nm, with the fluctuation of 1nm in vertical direction. The layer and structure of graphene depend on the preparation process, to prepare high quality graphene, one of the key steps is how to confirm the layer number and structure of graphene effectively. This paper introduced several main methods used to characterize graphene including the optical microscope, scanning electron microscope (SEM), transmission electron microscope (TEM), atomic force microscope (AFM), Raman spectrum (Raman), infrared spectrum (IR), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible spectra (UV - Vis) .
    • 工艺 技术
  • Gas absorption property and mechanism of Ni of the stack Ni/Zr-Co-Re getter film
    Shi-Fa TIAN; ;;
    . 2013, 44(21): 12-0.
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    Non-evaporable getter (NEG) stack layer thin films including protective layer of Ni and subject layer of Zr-Co-Re (Re indicating rare earth element) were prepared by RF magnetron sputtering. XPS was used to measure the content distribution of O element in the thin film getters and the anti-oxidation mechanism was investigated. The following results were concluded: (1) The stack Ni/Zr-Co-Re getter film activated at 160℃ for 3h shows higher gas absorption property than Zr-Co-Re single layer film. (2) The protective layer of Ni could not only protect the getter film from being oxidated but also improve the dissociation and diffusion of H2 molecule.
  • Influence of Different Aging Treatment on the Expansion Coefficient of Ni20Cr25 Electric-heating Wire
    ; ;;
    . 2013, 44(21): 13-0.
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    The influence of different aging treatment on the expansion coefficient of Ni20Cr25 electric-heating wire has been studied. The results showed that the suitable temperature of solution treatment is 1150℃. After the aging treatment of 930℃+10h, as the precipitation of quantities of stable carbides, the expansion coefficient of the electric-heating wire decreased obviously and the microscopic hardness could reach 237HV0.01 which is close to the one of cold-drawing.
  • Degradation of formaldehyde by Mesoporous Carbon supported Pt
    Shun Zhu; ;;
    . 2013, 44(21): 14-0.
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    The ordered mesoporous carbon was synthesized with triblock copolymer Pluronic 127 as the soft template, phenolic resins with low molecular weight as carbon sources via the evaporation induced self-assembly route. The ordered mesoporous carbon supported Platinum (Pt) catalyst (Pt/OMC) was prepared by chemical reduction method, characterized by Scanning Electron Microscope (FESEM), Energy Dispersive X-ray Spectroscopy (EDS), Transmission Electron Microscope (TEM), X-ray Diffraction (XRD) and nitrogen adsorption-desorption isotherm. The catalytic activity of Pt/OMC on formaldehyde was investigated. It indicated that Pt/OMC had excellent catalytic activity, and the removal rate on formaldehyde was more than 92.5% in 7 h. Moreover, it could be mineralized to carbon dioxide. High Performance Liquid Chromatography (HPLC) and Gas Chromatography (GC) were used to investigate the reaction mechanism for degrading formaldehyde, revealing that the formaldehyde was first decomposed into formic acid, then mineralized to carbon dioxide and water.
  • Stainless steel antireflection surface microstructured with two-step femtosecond laser method
    WU BO;Zhou Ming ;
    . 2013, 44(21): 15-0.
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    Stainless steel antireflection surface microstructured with two-step femtosecond laser method
  • Experimental Study on the Solidification Technology and Affecting Factors in Treating with Fly Ash Using Magnesium Oxychloride Cement
    Cai-Ping Wang;;
    . 2013, 44(21): 16-0.
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    Fly ash was solidified by magnesium oxychloride cement, the solidification effects and factors of Magnesium oxychloride cement in treating with fly ash were experimentally studied. The results indicated that fly ash treated with magnesium oxychloride cement had a optimum molar ratio. And under this condition, the leaching concentration was lowest, immobilized ratio was 94%;With increasing the amount of active magnesium oxide from 28.9% to 60.56%,the leaching concentration for Pb was significantly reduced and solidification ratio improved 23.9%.When the amount of active magnesium oxide was further increased, the leaching concentration for Pb was found decreased slowly； Magnesium oxychloride cement was prepared in molar ratio of 10:1 water-cemnt ratio of 0.3,the effect of solidification of this material with 20% content got better than comment portland 42.5 cement with 40% content and it meets the landfill standard. Moreover, the new solidification agent has a bright future for application.
  • Effect of metal ion-doping on photocatalytic activity of TiO2 nanotubes
    ; ;Bei-hai ZHOU;
    . 2013, 44(21): 17-0.
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    Abstract: Ions-doped TiO2 nanotubes were synthesized via a hydrothermal method and characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and speicfic surface areas. The binding energies of Al 2p, Fe 2p and Zn 2p indicated that the doping ions existed as Al3+, Fe3+ and Zn2+, respectively. With the increase of the calcination temperature, the specific surface area decreased. The intensity of anatase phase declined with enhancing the calcination temperature, and then decreased. The specific surface area decreased and the weight fractions of anatase phase increased when metal ions were doped into the catalyst. The removal efficiency of humic acid (HA) was 44% when un-doped TiO2 nanotubes calcined at 450°C were added, 11% higher than that in the presence P-25 TiO2 powder. Fe-doped TiO2 nanotubes calcined at 550°C had the best photocatalytic activity, as 77% of HA was degraded when this catalyst was added.
  • Fabrication and VOC-sensing properties of ultra-fast responding gas sensor based on Brush-like hierarchical ZnO nanobelts
    ;
    . 2013, 44(21): 18-0.
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    The brush-like hierarchical ZnO nanobelts were successfully synthesized by a simple chemical vapor deposition method. The morphology and the structure were investigated by scanning electron microscopy and x-ray diffraction. Thick film type tubular device was prepared by this material and gas sensing properties of the sensor devices were measured in a static apparatus. The sensor performance of the brush-like hierarchical ZnO nanobelts was measured for volatile organic compounds at 225℃. It is found that the nanostructures exhibited excellent volatile organic compounds sensing properties, especially quite rapidly response and recovery. The response and recovery time are 2s and 3s. Furthermore, the effect of material structure on sensing properties was also investigated in this paper.
  • Preparation of a Spherical Chelation Adsorbent under microwave assistant conditions
    ;;;
    . 2013, 44(21): 19-0.
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    The spherical polyacrylonitrile beads were prepared via phase inversion method usting DMF as solvent and dispersant solution as non-solvent and waste polyacrylonitrile fibre as raw material. Then the spherical PAN beads were used to prepare a multifunctional spherical chelation adsorbent, denoted as SPDA, under microwave assistant conditions. Besides, the physical and chemical properties were also studied. The results indicated SPDA contained amide and imidazolyl groups. And the optimum modified conditions included 7∶1 of the mass ratio of monomer and beads, 14∶100 of the mass ratio of catalyst and beads, 7∶5 of the mass ratio of EG and beads, 640W of the microwave power and 5mins of the radiation time. Additionally, study was also conducted regarding the adsorption of Cr(Ⅵ) on SPDA by static adsorption experiments. The removal percentage and equilibrium adsorption capacity of SPDA could reach 96.2% and 38.5mg/g under such conditions as 4 of the solution pH, 120mg/L of Cr(Ⅵ) concentration, 2h of the adsorption time and 30℃ of the adsorption temperature.
  • Preparation of styrene-acrylate emulsion and latex particles impact on properties of emulsion
    ;PANG Qi
    . 2013, 44(21): 20-0.
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    A kind of styrene-acrylate emulsion with excellent performance was synthesized by styrene, butyl acrylate (as the main monomers) and acrylic acid (as the functional monomer) via mixed emulsifiers of SDS/OP-10 and ammonium persulfate served as the initiator. The pre-emulsification technology and semi-continuous seed emulsion polymerization process were introduced. The polymer emulsion was characterized by Fourier transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), Gel Permeation Chromatography(GPC)and Nano-ZS90 etc. The effects of monomer ratio, composite emulsifier，polymerization temperature and the dosage of initiator on the emulsion film-forming properties, water resistance, stability and other conventional performance were systematically studied. The results showed that, the latex particle size was greatly influenced by composite emulsifier types and amount, but also related to the dosage of initiator. Monomer ratio is a key factor of the glass transition temperature.
  • The Solidification of Magnesium Phosphate Cement with Lead Nitrate in Different Environmental Conditions
    Jing-Ran WANG
    . 2013, 44(21): 21-0.
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    The solidification of magnesium phosphate cement with different content of nitric acid lead in different pH, carbonization conditions and chloride ions. Heavy metal Leaching rate law and the influence of different content of nitric acid lead on types and morphology of cement hydration products were studied. Research shows that: when the pH is 2, lead leaching rate was largest, and as the pH increased the leaching rate decreased. But pH is 12, leaching rate was slightly increased. The lead leaching rate would increase and then level-off in carbonization conditions. In chloride ions conditions，leaching rate of lead with the extension erosion time does not change significantly.
  • Preparation of N,O-Carboxymethyl chitosan resin and its adsorption for heavy metal ion
    Qi-Feng DANG ;;;;
    . 2013, 44(21): 22-0.
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    Abstract:In this study，a novel glutaraldehyde cross-linked N,O-Carboxymethyl chitosan resin was prepared by emulsion-chemical method, and the resulting adsorbent was characterized by means of SEM and FTIR. The use of resin for the removal of Cu(II)，Pb(II) and Cd(II) ions from aqueous solution at different initial pH, contact time, and initial concentrations has been investigated, maximum adsorption of Cu(II) ions was observed at pH 5，Pb(II) and Cd(II) ions was observed at pH 6. The kinetic of the adsorption process was estimated, the result indicated that the adsorption process followed the pseudo-second-order kinetics. Equilibrium studies showed that the data of Cu(II)，Pb(II) and Cd(II) adsorption followed the Langmuir model, The maximum adsorption capacities for Cu(II)，Pb(II) and Cd(II) were estimated a saturated capacity of 156.25,222.22 and 178.57mg/g at optimum pH , which demonstrated the high adsorption efficiency of resin toward the studied metal ions.
  • Research on preparation and performance of Activated Carbon Monoliths with inorganic cement binder
    Wan-jun chen; ;
    . 2013, 44(21): 23-0.
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    Cement clinker as inorganic cement binder was used to explore the forming and properties of powder activated carbon. Adding silicon micro powder and using Steam pressure curing in the process for improving the strength of the materials and shortening sample preparation cycle. The scanning electron microscopy , compressive strength, Iodine adsorption value, the porosity, water absorption, carbon content were used to intestigate the microstructures and the properties of activated carbon monoliths. The results show that 70wt% of activated carbon, 25wt% of cement clinker and 5wt% of silica powder were mixed, granulated, and molded, and then Steam pressure curing at 195℃ for 6 hours would provide a new path of getting the good properties of activated carbon monoliths; The corresponding properties of the optimal samples are listed below: the iodine adsorption value is 551.72mg/g, and the compressive strength is 7.25Mpa .The carbon content of 58.48%; the porosity is 57.34%, water absorption is 69.42%.
    • 研究 开发
  • Influence of Deuterium Content on Structure and Crystalline Perfection of K(H1-xDx)2PO4 Crystal
    ;;;;Yun SUN ;;
    . 2013, 44(21): 24-0.
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    A serials of K(H1-xDx)2PO4 crystals were grown by using traditional method from deuterated solutions. From the results of powder X-ray diffraction (XRD), it shows that the no changes occurred on symmetry of structure in K(H1-xDx)2PO4 crystals, while lattice parameter a increases with a increase of deuterium content of crystal. High resolution XRD was taken to characterize crystalline perfection. It is indicated that crystalline perfection was destroyed slightly by the replacement of partial H atoms by D atoms in KDP-DKDP mixed crystals.
  • Molecular Dynamics Simulation of Mechanical Properties and Surface Interaction for HA/PLA
    . 2013, 44(21): 25-0.
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    HA/PLA composite material can realize the complementary advantages in the very great degree, is expected to become an ideal bone replacement material. In this paper, molecular dynamics simulation was applied to investigate the binding energy of NBCA on HA crystallographic planes (001), (100) and (110),and then the mechanical properties and radial distribution function of the HA(110)/NBCA mixed system were calculated and analyzed. The results show that HA (110) has the highest binding energy with these polymers because of its higher planar atom density than that of HA (001) and (100). By calculating the radial distribution function, the interface interaction and its essence of the HA(110)/NBCA were elucidated. There is a strong interaction between HA crystallographic plane (110) and PLA，it is mainly derived from the hydrogen bonds between O atoms of PLA and H atoms in HA crystal. The PLA component plays a significant role in strengthening the mechanical properties of HA. And the mechanical properties of HA/PLA in each direction is closer than single component HA, thus overcoming the defects caused due to the anisotropy of the material.
  • Sintering properties of cordierite tapes by aqueous tape-casting
    ;;;;
    . 2013, 44(21): 26-0.
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    Cordierite powders prepared by sol-gel method were used as raw materials. Sodium polyacrylate, polyving akohol and polyethylene glycol were acted as dispersant, adhesive and plasticizer, respectively. The cordierite green tapes were obtained by aqueous tape-casting process. Sintering properties and microstructure were investigated. It turned out that cordierite sheets sintered at 1000℃ is composed of α-cordierite crystal phase and has higher density. The density of laminated sheet sintered at 1000℃ is also on the high side, the interface between layers diminished.. And the dielectric constant ε and dielectric losses tan δ of cordierite laminated sheet sintered at 1000℃ are 4.56 and 0.0032 at 1GHz, respectively. Dielectric performance can meet the requirements of chip inductance components.
  • Force-sensitive properties of 83wt% FeCuNbSiB powder/silicone rubber composite film
    Jia ZHOU;Zhenghou Zhu
    . 2013, 44(21): 28-0.
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    Composite film was prepared by Fe73.5Cu1Nb3Si13.5B9 powder as compound phase and silicone rubber as matrix phase. The content of powder is 83% and the thickness of film is 200μm.Impedance- Z and stress- σ of film were tested by TH2816LCR digital bridge when frequency was 1kHz. LYYL-500N high-grade type microcomputer control pressure testing machine was used to program control loading. Film system was connected by capacitance way, The force-sensitive properties were studied when stress loading and unloading was continuous or retentive. The results show that when frequency is 1kHz and stress is 0.2~1.0MPa, Composite film has excellent force-sensitive stability and sensitivity in condition that the speed of continuous loading and unloading is low 0.5mm/mim and loading and unloading is retentive. The impedance is declining nonlinear with the stress is increasing. The value of SI% is 6%~23%, the value of sensitivity-k is 2~0.2,the standard deviation is stability in 0.02~0.0.The film is more sensitive when stress is low to 0.3MPa.Increasing test frequency can improve the sensitivity of film. When stress is between 0.2~1.0MPa the elastic aftereffect phenomenon is obvious, Which leads to the loading Z---σ curve and unloading is not coincident.
  • Preparation and characterization of TiO2/Ag core-shell structure inverse opals
    ;;;
    . 2013, 44(21): 29-0.
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    Firstly, the polystyrene (PS) microspheres with silver shell were synthesized by chemical reduction method. Subsequently，PS/Ag core-shell opals template was prepared using vertical deposition method, then TiO2 infiltrated into opal template by sol-gel method. Finally the samples were calcinated to remove PS microspheres, leaving TiO2 /Ag inverse opal. The samples were characterized and investigated by SEM, TEM and XRD. The results showed that the surface of PS microspheres was coated by nano-silver；The unit cell parameters of the obtained TiO2/Ag core-shell inverse opals after calcination at 480℃ for 12 h can be controlled by adjusting the shell thickness of silver. In other words, PS/Ag microspheres with different shell thickness of silver, three-dimensional opals and inverse opals structure with different unit cell parameters can be obtained only by tuning AgNO3/PS mass ratio.
  • Simulation study on the influence of the scale of preform to the densification in CVI process of C/C composite
    Peng XU; ;;;
    . 2013, 44(21): 30-0.
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    CVI processes of different diameter of preforms were studied in this research to analyze the influence of the scale of perform to the densification in CVI. Preforms of the equivalent height of 90mm and each diameter was 60mm, 120mm and 180mm was used to simulate the porosity and density field in 4 periods. Results showed that it was easy to get uniform and high score of density in small diameter preform, when crust occurred on the surface of larger diameter preform, additionally, in larger size preform density in surface area was higher and negative density gradient formed from the center to the boundary of the final product.
  • The photophysical properties of tetra-carboxyl-aminohexanoic-sulfonyl phthalocyanine aluminium (III)chloride/ bovine serum albumin conjugates
    ;; ;
    . 2013, 44(21): 31-0.
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    The purpose of this study is to investigate the photophyical properties of 3 rd generation photosensitizer using in photodynamic therapy. The photophysical properties of tetra-carboxyl-aminohexanoic-sulfonyl phthalocyanine aluminium chloride (AlPc(SO2NHC5H10COOH)4)-bovine serum albumin (BSA) bioconjugate was studied by UV/Vis and fluorescence spectroscopic method. The results indicated AlPc(SO2NHC5H10COOH)4 exhibited lower aggregation, higher fluorescence intensity and longer lifetime compared with tetra-carboxyl phthalocyanine aluminium chloride (AlPc(COOH)4) which may due to the spacer hindrance effect. When AlPc(SO2NHC5H10COOH)4 and AlPc(COOH)4 conjugates with BSA, compared with the corresponding free phthalocyanine, the UV/Vis spectra of AlPc(COOH)4/BSA and AlPc(SO2NHC5H10COOH)4/BSA was red shift and fluorescence spectra was quenched . Furthermore, AlPc(SO2NHC5H10COOH)4 conjugate also showed stronger combining interaction with bovine serum albumin than that of AlPc(COOH)4 due to the spacer hindrance effect.
  • Research on Microwave Absorbing Property of the Fe-based Alloy Fe63Co20Ce13Al4
    ;
    . 2013, 44(21): 32-0.
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    The powders were obtained by arc smelting and high energy ball milling method. The phase structure, morphology, and microwave absorbing properties of the powder which milling different time (40, 50, 60, 70h) were researched by XRD, SEM and vector network analyzer. The results show that with increasing milling time, the absorption peaks move to the low frequency, the value of absorption peaks decreases, and the absorbing band widens. Powders after milling 60h obtain better flattened effect. When absorbing coating thickness d = 1.8mm, the minimum absorption peak value is -10.8dB at 4.5GHz. With the absorbing coating thickness increasing, the absorption peaks shift to lower frequency, the value of absorption peaks increases, and the absorbing bandwidth narrowing.
    • 工艺 技术
  • Rapid Synthesis and Characterization of SilverNanowires with single crystal structure by Chemical Reduction Induced by L-cysteine
    . 2013, 44(21): 33-0.
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    Abstract: Well-defined silver nanowires with uniform diameter and length were successfully and rapidly synthesized from silver nitrate by a typical chemical reduction method induced by L-cysteine using poly (vinyl pyrrolidone) (PVP) as the surfactant agent and ethylene glycol as reducing agent. The obtained specimen were investigated by UV-visible absorption spectrum(UV), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), selected area electron diffraction (SAED), transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). The results indicated that silver nanowires with uniform diameter of about 100nm and length of several hundred micrometers could be successfully obtained within 15 min. The as synthesized silver nanowires showed single crystal structure. The possible rapid synthesis mechanism induced by L-cysteine was also demonstrated according to the experiment results.
    • 研究 开发
  • Study on Characteristics of ITiO films by room temperature depositon and excimer laser annealing
    Yi SHEN
    . 2013, 44(21): 34-0.
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    ITiO film was deposited by the methods of room temperature magnetron sputtering and annealed by the XeCl excimer laser in vaccum. The optic, electronic characteristics and phase structure were tested by spectrophotometer, hall-effect testing instrument and X-Ray diffractometer respectively. The result show that, irradiation by excimer laser with power of 100-150 mJ/cm2 can convert the thin film from the amorphous state to a polymorphic state, activate the doped Ti atoms, and decrease the resistivity of the film. In addition, improve the laser power can reduce the carrier concentration and make the transmittance increase. By the excimer laser annealing of 150mJ/cm2, the resistivity of the ITiO film is 6.93×10-4Ω/cm，and transmittance can reach 88.4%.
    • 工艺 技术
  • Effect of surface wettibility of Al-Mg alloy on its tribological characteristics in the condition of water lubrication
    . 2013, 44(21): 35-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Self-assembled monolayers(SAMs) on Al-Mg alloy surface were prepared by self-assembled technique. Water contact angles on SAMs were measured by contact angle measurement. Tribological characteristics of Al-Mg alloy with different SAMs were evaluated by CETR Universal Micro-Tribometer. The results indicate that the wettibility of Al-Mg alloy surface can significantly be changed by SAMs. The Al-Mg alloy surfaces with FDTS、FOTS、OTS SAMs appear hydrophobic, however, the Al-Mg alloy surfaces with MPS、APS SAMs posess hydrophilic characteristics. The water contact angles for 5 kinds of SAMs are in the order from large to small, FDTS, FOTS, OTS, MPS, APS. The stronger of hydrophobicity of SAMs, the smaller of friction coefficients of AL-Mg alloy. For the same SAMs, the friction coefficient of AL-Mg alloy is lowest in water-jet lubrication condition, middle in water lubrication condition, and largest in dry friction condition.
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