25 December 2010, Volume 41 Issue S3
    

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    研究与开发
  • Damping property of the ternary blends with MJLCP and IPN polyacrylate
    WAN Li-Ying
    . 2010, 41(S3): 1-0.
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    Abstract：In this paper, The ternary blend damping materials with MJLCP and IPN polyacrylate were prepared by situ composite technology through dispersing PBPCS into polyacrylate core-shell structure. We preliminary know that MJLCP was wrapped in IPN polyacrylate by IR, TEM, but PBPCS affected the normal core-shell particle structure morphology. The blends’ maximum dissipation factor increased to above 0.9 at high temperatures because of the PBPCS adding, it indicates that MJLCP can promote the damping property of IPN polyacrylate to some extent.
  • Preparation and Properties of NTC Thermistors with Measuring Very Low Temperature
    . 2010, 41(S3): 2-0.
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    Negative temperature coefficient (NTC) ceramic with spinel structure of Fe-Co-Mn-Ni composition, doped by the ion La3+, was prepared by the Pechini method. The phase composition and microstructure of materials were characterized by means of X-ray diffraction and scanning electron microscope，and the electric properties and aging were also measured. The experimental results show that thermo-sensitive ceramics obtained at 1100℃ was steady, the prepared sensors have resistance in the range from 90 kΩ to 120 kΩ at 20 K, the sensitivity ranged from 0.5 kΩ/K to 45 kΩ/K in the temperature range from 45 K to20 K. The current-induced temperature error is less than 0.1 K at 20 K. The values of thermistor constant, B20 K/40 K range from180 K to 210 K.
  • Effect of Amount of Ca2+ Substituting La3+ on Catalysis Activeness of La-Ca-Co-O to Oxygen Reduction and its Conductivity
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    . 2010, 41(S3): 3-0.
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    In order to optimize composition of perovskite-type La1-xCaxCoO3, the change mechanism of exchange current density of La1-xCaxCoO3 catalyzing oxygen reduction and its conductivity is investigated when La3+ is substituted by varied amount of Ca2+. La1-xCaxCoO3 powder is prepared through sol-gel method, and its phase structure is checked by XRD. It shows that phase Ca2Co2O5 will form when amount of Ca2+ is bigger. The electrochemical effective area of powders with different amount of Ca2+ is determined through potential step technology. The electrochemical polarization of powder for catalyzing oxygen reduction is investigated by linear scan voltammetry technology in 6M KOH solution. And then, the exchange current density during catalyzing oxygen reduction is measured through Tafel technology. The apparent conductance of powder pellet is measured by direct current circuit method. Results show that the exchange current density of La1-xCaxCoO3 catalyzing oxygen reduction increases with Ca2+ amount at first, and then decreases again. The exchange current density reaches its maximum, about 0.1382A/m2, at x=0.5～0.6. In the same way, the apparent conductivity changes according to similar trend. It reaches the maximum, about 0.2930Ω-1?m-1, at x=0.5～0.6. The change trend of exchange current density and apparent conductivity is consistent essentially with Ca2+ replacing La3+ in La1-xCaxCoO3 lattice.
  • Fabrication of the All-Solid-State Ag/AgCl Electrode
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    . 2010, 41(S3): 4-0.
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    Abstract: The preparation technology of the precursor powder of AgCl used in Ag/AgCl electrode was discussed, which were characterized by scanning electron microscope (SEM) and x-ray diffraction(XRD). And the short term stability and electrochemical noise of the prepared electrodes were carried out. Results show that the precursor powder of AgCl prepared by freeze-drying method ,with AgNO3 and NaCl as raw materials, ethanol as grinding aids , milling time 8 hours, is good in dispersion and uniform in size .The prepared Ag/AgCl electrode sintered at 490℃ has a good consistency and the potential difference of the two like electrodes is less than 0.006 mV. The electrode possesses good short term stability, with a potential difference drift of less than 0.080mV/24h. The voltage noise density of electrode decreases to 8.34nV/Hz1/2 at 1 Hz.
  • Study on a kind of thermochromic glass material and its practical performance
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    . 2010, 41(S3): 5-0.
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  • Simulation of organic thin-film growth for thermal evaporation process
    HU Chen;
    . 2010, 41(S3): 6-0.
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    Based on the Monte Carlo method, a model of thermal evaporation system was proposed to simulate the growth process of organic thin-film. In this model, several point type sources were uniformly distributed around a circle and evaporated simultaneously. The effect of the number of point type sources, circle radius and source-substrate distance on the uniformity was analyzed. The results show that increasing the number of point type source, circle radius and source-substrate distance can effectively improve thin-film uniformity. Based on the method proposed in this study, the uniformity of the thickness in the organic layer was successfully controlled around 5%.
  • Synthesis and Fluorescence Quenching Properties of Fluorescent Conjugated Polymer PPEs
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    . 2010, 41(S3): 7-0.
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    Abstract: Three poly(p-phenyleneethynylene，PPE) derivatives containing pentiptycene group were synthesized through Sonogashira coupling reaction. They were PPE-A with symmetrical substitutes, PPE-B with symmetrical alkoxyl substitutes and PPE-C with alkyl substitutes. PPEs were characterized by 1 H-NMR and FT-IR, UV-Vis and PL. The influence of different benzene ring side chain on the solubility and spectrum of PPEs were studied. The fluorescence quenching properties of PPE-A and B versus two nitro-aromatic compounds were also studied. The results showed that they have a good fluorescence response to m-DNB and p-NT.
  • Study on Grafting Functionalization of Multiwalled Carbon Nanotubes by Reactive Flame Retardant Based on Phosphorus
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    . 2010, 41(S3): 8-0.
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    Multi-walled carbon nanotubes (MWNTs) were functionalized by phosphorus-containing flame retardant through several reactions including oxidation, chloroformylation, and esterification. The chemical structure, thermal stability, and the dispersive ability in solvents were investigated. The results indicated that some carboxylic acid group (-COOH), which increased in quantity under increased oxidation time, formed by oxidation with mixed acids (H2SO4/HNO3). Increased dispersive ability in solvent (THF) were achieved by further esterification grafting flame retardant onto MWNTs. Thermal gravity analysis (TGA) indicated a less thermal stability for functionlized MWNTs, compared to crude MWNTs.
  • Quasi-static and high strain rate tensile mechanical behavior of V-5Cr-5Ti alloy
    HU wen jun
    . 2010, 41(S3): 9-0.
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    In this work the static and dynamic tensile properties of vanadium V-5Cr-5Ti alloy were investigated at strain rates ranged from 3.3x10-5/s to 1.2x102/s，coefficient of strain rate sensitivity was obtained. The material microstructures were analyzed using optical microscope, SEM, TEM, XRD and EDS. Results show that the yield strength a increases with strain rate. The brittle-ductile transition strain-rate is about 101/s to102/s, From the quasi-static to dynamic strain rates higher strain rate sensitivity coefficient. At room temperature the tensile fracture at a low strain rate occurs via mixed modes of microvoid aggregating and transgranular cracking; at high strain rate the fracture occurs via a brittle mode. The analysis by TEM, XRD and EDX shows the existence of lath martensite, and on there exits precipitate phase of Ti(O,C, N) in grain boundaries.
  • Preparation and performance of porous aluminum by gel-casting
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    . 2010, 41(S3): 10-0.
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    Abstract：The porous aluminum with complex shape was prepared by gel-casting, in order to develop new preparation technology and improve performance of porous aluminum. The effects of the solid loading of concentrated suspension and sintering temperature on density, porosity, micro-structure and anti-compressive properties of porous aluminum were discussed. The results show that the density and anti-compression properties increased with rising solid loading of concentrated suspension. The optimum sintering temperature of porous aluminum were 680℃, without sintering aids. Porous aluminum products were obtained with open-cell, average pore diameter of 3.82μm, compression strength of 76.8MP，specific surface area above 0.12m2/g. And the controllable range of porosity was between 34%-53%.
  • Preparation of Nanosized Ni0.3Zn0.7Fe2O4 using Gas Bubble Liquid Membrane Process and Hydrothermal Method
    Ming Ming ZUO ;;;
    . 2010, 41(S3): 12-0.
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    By means of a gas bubble liquid membrane (GBLM) process the Ni0.3Zn0.7Fe2O4 precursor was prepared from the precipitation reaction of FeCl3、NiCl2 and ZnCl2 mix aqueous solution with NaOH aqueous solution with the use of sodium stearate as coating agent. Pure Ni0.3Zn0.7Fe2O4 magnetic materials were obtained after the precursor was cured with hydrothermal (HT) method at subcritical temperature of water, which was verified by XRD.VSM measurements show that saturation magnetization of the ferrite is up to be 87.56emu/g, and magnetic coercivity Hc to be 14emu/g. These implied the potential application of GBLM- HT process in the large scale production of ferrites at low temperature.
  • Preparation and Application of Triazine Dithiol Nano-films on the Metal Surface
    Fang Wang ;
    . 2010, 41(S3): 14-0.
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    Abstract：The structure and characteristics of triazine dithiol compounds were summarized. The preparation method and application area of polymeric nano-films about triazine dithiols were reviewed in this paper, and the adsorption and polymerization mechanisms of these compounds on the metal surface were analyzed and discussed in detail. The new application of these polymeric nano-films was prospected.
  • Improving effects of electrospun composite nanofibers on the dissolution and permeation of poorly water soluble drugs
    . 2010, 41(S3): 15-0.
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    Multicomponents composite nanofibers have been prepared from co-dissolving solutions of Polyvinylpyrrolidone K30 (PVP K30), sodium dodecyl sulfate (SDS), and Ferulic Acid (FA) with a weight ratio of 30:1:10 in the 75 (v/v) % ethanol aqueous solutions using electrospinning process. FESEM observations showed that the the nanofibers were in a format of three-dimensional continuous web with smooth surface and homogeneous structure. 94% of the nanofibers falled in a diameter range of 100-300nm. XRD and DSC results suggested that FA and SDS were able to distribute in the PVP K30 fiber matrix on a molecular scale. ATR-FTIR spectra verified that second-order interactions such as hydrogen bonding, electrostatic forces and hydrophobic forces played a fundamental role in the forming of the composite nanofibers. In vitro dissolution and permeation tests illustrated that the composite nanofibers could improve both the dissolution rates and the permeation profiles of FA.
  • Friction/wear properties of magnetron sputtered TiB2-TiN composite films on Ti6Al4V alloy substrate
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    . 2010, 41(S3): 16-0.
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    The microstructure and friction/wear properties of TiB2-TiN composite films in SiC/TiB2-TiN double layer films (SiC film as interlayer) deposited on Ti6Al4V alloy substrate using magnetron sputtering at room temperature were investigated. The results showed that the TiB2-TiN composite films exhibited the micro-structural characteristics with nano-scale particles (domains), and that all the interfaces among the substrate, SiC film and TiB2-TiN composite films showed good bonding, with large and gradual element diffusions. When sliding against a Si3N4 (silicon nitride) ball (2 mm in radius) using ball-on-disc type wear tester at room temperature under Kokubo simulation body fluid and 200 g load, the TiB2-TiN composite films exhibited the friction coefficient of about 0.22 and the specific wear rate on the order of about 10-6 mm3/(m·N). In addition, it was found that the TiB2-TiN composite films had great adhesion effect on elements (Ca, P) in Kokubo simulation body fluid.
  • Study on magnetism Q workstation of AlNiCo alloy at high temperature
    ;sun jian chun
    . 2010, 41(S3): 17-0.
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    The magnetic performance of two AlNiCo hard magnet alloys used in aero field was was measured by high temperature magnetic testing system AMT-4 between 28～160℃. Results show that with the increase of temperature the performance of AlNiCo alloys decreases. LNGT32 alloy has a larger magnetism loss（а= hT/℃）than LNGT64 between 28～160℃, while LNGT64 alloy has a more stable Q workstation （tgθ=Bd/Hd） than LNGT32 alloy.
  • Study on Effect of Vibration on Aerospace Permanent Magnents
    ;sun jian chun
    . 2010, 41(S3): 18-0.
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    Three factors and three levels orthogonal experiment were used to simulate aerospace environmental vibration of AlNiCo permanent magnent,analyzing,the vibration factors influencing magnetic properties combined with variance analysis.The results indicate that obvious defect un-occurrs and magnetic properties are within limite after vibration; The influence of vibration factors to magnetic properties is not significant, the effects has some influences on coercivity and the strong-to-weak route are tine, acceleration, frequency,but others have little effect. The test provide reference for aerospace application of AlNiCo permanent magnent.
  • Optimization of technology of Reaction Sintered Silicon Nitride Bonding Silicon Carbide Multiphase Ceramics by Orthogonal Test
    gui hong geng;shao hua luo
    . 2010, 41(S3): 19-0.
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    Reaction bonded Silicon nitride/silicon carbide composites were fabricated by recative sintering. A group of orthogonal test is arranged and carried out to study the effect of raw materials on mechanical properties in this paper. The microstructures and the fracture morphology of composites were observed by SEM and the components were analysed by XRD. The results show that α-Si3N4 of particles 、needle-like β- Si3N4 and a small amount of Sialon were generated during the sintered. The β- Si3N4 formate mesh structure with based. The test results on optimum condition show is that the hardness、flexural strength and fracture toughness property of stocks have been strengthened.
  • The Preparation And Properties Research Of Inner Ni Electrode Used In PTCR With Multilayer Chip
    . 2010, 41(S3): 20-0.
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    In the production process of using Ni as inner electrode in multilayer chip PTCR, as for the problems that the inner Ni electrode is easy to be oxidized and the layering problem between the electrode and the ceramic. We added 10wt% of BaTiO3 powder, 15wt% of Cr powder in Ni electrode paste and choose terpineol and dibutylo-phthalate as organic solvents and rosin as organic adhesive ,which well solved the layering phenomenon and the protection of inner Ni electrode. So we ultimately achieved the goal of producing sound inner Ni electrode.
  • Effect of Morphology and Light Irradiation on Antibacterial Activity of ZnO
    Xing Duan ;;;;;;
    . 2010, 41(S3): 21-0.
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    The antibacterial activities of tetrapod-like ZnO whisker, nano-scaled ZnO and commercial ZnO particles were examined in this paper. Effects of morphology and light irradiation on antibacterial properties of ZnO were studied. The results indicated that morphology of ZnO has significant impact on its antibacterial property. Antibacterial property of ZnO under solar light irradiation is greater than that in dark. The antibacterial activities of ZnO on different bacterial species were also studied, and it can be seen that antibacterial properties of these three kinds of ZnOs on the E. coli are all better than that on the S. aureus.
  • Preparation of nano-LiCoO2 Thin Film by Sol-Gel Method
    Jing Zhang Guangfen Li
    . 2010, 41(S3): 22-0.
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    Abstract：Here the LiCoO2 nano-crystallization was prepared by calcination of a thin film covered on the solid substrates. The thin film was obtained by spinning coating the solution consisting of LiNO3, Co(NO3)2 and PAA on the pre-cleaned glass substrate by a sol-gel method. The polarizing microscope，scanning electron microscope and atomic force microscopy analysis show that the content of PAA, the total concentration and the ratio of both Li+ and Co2+ have significant influences on the film composition，thus the morphology of thin films, whereas the spin speed can dominate the film morphology and the process of the nano-crystallization. It was found that the best sintering temperature of the thin films is about 600℃ in this study.
  • The research of the effect of Hydrostatic Pressure on mechanical behaviors of Viscoelastic functionally graded structures
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    . 2010, 41(S3): 23-0.
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    The effect of hydrostatic pressure on mechanical properties of viscoelastic functionally graded materials and structures is studies in this paper. The constitutive relation of the viscoelastic functionally graded materials under hydrostatic pressure is given based on the viscoelastic materials’ Boltzmanna-integral constitutive relations. It is assumed in analysis that the creep compliance of the functionally graded structures vary continuously through the thickness and obey a power law distribution of the volume fraction of the constituents. Then, the variation of properties distributiion, thickness and bending rigidity of viscoelastic functionally graded structures arising from hydrostatic pressure is researched based on the foregoing work, as well as the bending, buckling and vibration behaviors. The curve of the variation of thickness and bending rigidity according to time is presented for viscoelastic functionally graded structures under constant hydrostatic pressure with different volume fraction exponent indexs. It is shown through the numerical examples that, the thickness and bending rigidity of viscoelastic functionally graded structures under hydrostatic pressure is changed largely, which finally leads to the obvious variation of their bending, buckling and vibration behaviors.
  • Growth of high quality c-axis-oriented AlN thin films by middle frequency sputtering
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    . 2010, 41(S3): 24-0.
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    In the present paper, AlN thin films were deposited on Si (100) substrate by a middle frequency sputtering. And the grown AlN thin films were studied by X-ray diffraction, scanning electron microscope and Raman spectroscopy. The growth parameters, such as substrate-target spacing, sputtering power and N2 partial pressure, on the texture degree of the AlN thin film were investigated. The results reveal that higher sputtering power, shorter substrate-target spacing and lower N2 ratio is benefit to the formation of [002] texture. Under optimum deposition conditions, high quality of AlN thin films was obtained. The full width at half maximum (FWHM) in rocking curve is 5.7°, and the FWHM of E2 (high) in Raman spectrum is only 13.8cm-1.
  • Influence of PbO on three fundamental color upconversion luminescence of Tm3+/Ho3+/Yb3+ codoped tellurite glasses
    WANG Da Gang
    . 2010, 41(S3): 25-0.
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    Tm3+/Ho3+/Yb3+ codoped tellurite glasses were prepared by conventional melt-quenching method. The heavy metal oxide PbO with lower phonon energy was introduced into the tellurite glass with a composition of TeO2-ZnO-La2O3. The effect of PbO content on the Raman spectra of the matrixes and the upconversion luminescence spectra of the Tm3+/Ho3+/Yb3+ codoped samples were studied. The results show that，with the increase of PbO content, the phonon energy of host glass decreased, and the phonon density also have decrescence tendency. The intensity of upconversion blue (480nm), green (546nm) and red (662nm) of the Tm3+/Ho3+/Yb3+ codoped glasses were significantly enhanced at room temperature under 975nm LD excitation, and the blue luminescence intensity of the impact is greater than the impact on the green and red.
  • Photoluminescence characteristics of the mullite doped with strontium
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    . 2010, 41(S3): 26-0.
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    Europium activated luminescent mullite doped with strontium were synthesized by solid-state reaction. The synthesized product was characterized by XRD method to determine the phase compositions. The spectrophotometer was used to analyze the excitation and emission spectra and luminescence mechanisms were discussed. The results indicate that the excitation spectrum of pure mullite was a single peak at 300 nm, ascribed to Eu3+ ions transition from 7F0 to 5H3. However the excitation spectrum of mullite doped strontium is the typical broad bands with two peaks at 260nm and 328nm, which caused by 4f7(8S)→4f65d1(t2g) and 4f7(8S)→4f65d1(eg) of Eu2+ ions respectively. The best concentration of activator in the system is 3%. Luminescent mechanism reveales that the substitution of Sr2+ for Al3+ induced the negative vacancy to be appeared in SrAl2Si2O8, which attributed mainly to Eu3+ to be reduced to Eu2+ through matrix transport, and lead to the characteristic emission of the Eu2+. The peak of emission spectrum is at 410 nm, showing bright blue color.
  • Ammonium Polyphosphate as a Flame Retardant in Recycled Poly(ethylene terephthalate) Alloy
    . 2010, 41(S3): 27-0.
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  • Research on Microstructures and Blood Compatibility of Ta-doped TiO2 Films on Nano-grained Ti
    . 2010, 41(S3): 28-0.
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    Abstract: The morphology, structure and blood compatibility of TiO2 films with different content Ta-doped that deposited on nano-grained Ti by DC magnetron reactive sputtering technology were researched. The results show that nano-grained Ti has s strong induction of rutile nucleation effect and TiO2 film deposited on nano-grained Ti at room temperature contains above 90%(wt.%) rutile phase. Ta-doped can refine the grain of TiO2 film and inhibit the formation of rutile phase. TiO2 film with a few Ta-doped has optimal blood compatibility among other specimens with different content Ta-doped. And TiO2 film with excess Ta-doped is amorphous and deteriorates the blood compatibility of TiO2 film for inhibiting the formation of rutile phase.
  • Preparation of VO2（B）and VO2（M）powder by Inorganic Sol-Gel method
    dong yan feng
    . 2010, 41(S3): 29-0.
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    Abstract: VO2（B）powder was synthesized by reducing V2O5 powders in H2, which was prepared by inorganic sol-gel method. Then VO2（M）is obtained after annealing VO2（B）in Ar. X-ray diffraction (XRD) 、Infrared absorption spectrum (IR) 、differential thermal analysis (DTA) and transmission electron microscopy (TEM) were employed to characterize the component and structure of the preparated powder. The results show that VO2（B）can be made at 500℃ in 50% H2 atmosphere. Most particles are platelike.After respectively annealed at 550℃、600℃、650℃、700℃ in Ar atmosphere for 1 hour, VO2（B）transforms to VO2（M）in various degree. After VO2（B）is treated at 700℃. VO2（M）is prepared successfully.
  • Effect of particle size on compressive property of nickel alloy porous materials
    . 2010, 41(S3): 30-0.
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    Monel alloy sintered porous material is one of the important metallic filter materials. It is widely used in chemical, nuclear and petrochemical et al industries because it exhibits extremely high temperature corrosion resistance, high resistance to impact and good weldabilty. Research on its mechanical properties has become very important with application enlargement and condition more and more serious. In this paper, cylinder-like samples φ20×25 mm by powder metallurgy were selected for compression test. Experiments were carried out by MTS810 with unique axes load in quasi-static state. The effect of particle size on compressive property of nickel alloy porous materials with same porosity was investigated. The experiment results indicated that the compressive stress-strain curve of nickel alloy porous materials possess the characteristics of plastic materials. The elastic modulus and yield strength increase with decreasing particle size, such as particle size is less than 75μm, the elastic modulus and yield strength increase obviously.
  • Influence of Morphology of Precursor Particles on W-Co Powder Morphology
    . 2010, 41(S3): 31-0.
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    Study is made on the preparation method, particle morphology of powder blue and cobalt oxalate，which are used as precursor for reduction of W-Co alloy powder. The morphology were analyzed by SEM．Discussion is made on the relation-ship between the morphology of W-Co alloy powder particle and precursor.
  • The Micro Flow Restrictors for Hall Current Thruster
    Ping TAN
    . 2010, 41(S3): 32-0.
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    The micro flow restrictors for Hall current thruster application was introduced in this paper. A precise control of micro flowrate was the base of Hall current thruster for compatible work. Now, metal capillary, metal porous and throttle orifice etc are internationally main methods of micro flow restrictors used for electric thruster according to different internal throttling elements. Most of micro flow restrictors prepared by Russia were metal capillary and throttle orifice and that by American and Europe were metal porous. In addition, a flowrate proportional control valve of magnetostrictive material manufactured by foreign was also used to control micro flowrate for electric thruster system recently. The common filter porous material used now can be substituted by metal porous micro flow restrictors with unit structure, and the properties or life or reliability of micro flow restrictors were improved greatly.
  • The preparation and characterization of calcium alginate porous scaffolds for tissue engineering
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    . 2010, 41(S3): 33-0.
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    The calcium alginate porous scaffolds for tissue engineering, which can be assembled in nerve conduits, was prepared by the method of casting/freeze-drying. Through analysing IR, SEM, the equilibrium swelling ratio and compressive strength of the porous scaffolds in cross-linking agent of various concentration, the water content and specific volumetric dilatation of the porous scaffolds in SBF, we discussed the comprehensive performance of the sodium alginate porous scaffolds. The results demonstrated that the sodium alginate porous scaffolds can react quickly to produce calcium alginate when was soaked in calcium chloride solution, and it can keep the intrinsic porous structure, which was in a certain direction, pore-connected and porous-layered, in the gelation process. The compressive strength of the calcium alginate porous scaffolds increased as the Ca2+ concentration of the cross-linking agent increased, thereby improved the stability of the porous scaffolds. The water content of the calcium alginate porous scaffolds was more than 90% in SBF, and the specific volumetric dilatation was inversely proportional to the Ca2+concentration of the cross-linking agent.
  • Effect of porosity on shear properties of sintering metal fibre porous material
    . 2010, 41(S3): 34-0.
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    Metal fiber porous materials, which consists of in diameter 100μm fibers were prepared by loose sintering, and the shear properties of sintering metal fibre porous materials with porosity range of about 70%-95% were tested on the MTS858 machine, effects of porosity of the material on shear property of porous metal fiber media were analyzed.. The results indicated that shear stress-strain curve of porous metal fiber media present three distinct stages, linear elastic deformation stage, plastic deformation stage and shear failure stage. The yield strength and unloading elasticity modulus decreased with the increase of the porosity.
  • Preparation of Water-Transferring Fiber of Water Storage and Controlled-release Film
    . 2010, 41(S3): 35-0.
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    Abstract: The natural plant fibers were chosen in this paper by comparing the water releasing performance of the natural plant fiber, the animal fiber and the chemical fibre which were compounded with the environmentally friendly film. The chosen fibers were pretreated to improve their water releasing performance. The morphology were observed and the stretch properties were analyzed after soaking the fibers in the self-made pretreatment agent at normal temperature, 50℃ and 100℃. The results indicate that the fiber treated in the agent whose concentration is 14% at normal temperature show the better properties of hydrophilic and stretch ability. The natural plant fibers treated in 14% agent with 30 minutes at normal temperature can be used as the water-transferring fiber.
  • Preparation of tea residue supported nanoscale zero-valent iron and its removal of methanil yellow G from aqueous solution
    . 2010, 41(S3): 36-0.
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    In this paper, nanoscale zero-valent iron (nZVI) and tea residue supported nanoscale zero valent iron (TS60-nZVI) was prepared using the sodium borohydride reduction method, and used it to remove the methanil yellow G (MYG) from aqueous solution. It was found that TS60-nZVI was more efficient in removal of MYG with 92.55%. Furthermore, SEM showed that the tea residue as a supporter led to a decrease in aggregation of iron nanoparticles, the surface of TS60-nZVI was changed before and after used it to remove MYG, and XRD showed that the precipitation of iron oxide was observed. These indicate that Fe0 was oxidized during removal of MYG. In addition, kinetic study based on the experimental data indicated that the reaction fitted to pseudo first-order –model well and described with Langmuir-Hinshelwood kinetics equation, the apparent rate constants(Kobs) was 6.0×10-3 min-1, and half life was 115.52 min.
  • Preparation and visible-light photocatalysis of ZnSe-supported TiO2 nanobelts
    Tianhao JiJi Zhou;
    . 2010, 41(S3): 37-0.
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    Cubic ZnSe-supported anatase TiO2 nanobelts can be prepared by hydrothermal synthesis process. Only hexagonal ZnO-supported TiO2 nanobelts were obtained at 140 ℃ for 6h, whereas after such product was treated at 160 ℃ for 6h once again, ZnSe-supported TiO2 nanobelts were prepared; if the reaction time was prolonged to 24h at 140 ℃, ZnO-supported TiO2 nanobelts with a little bit ZnSe could be observed. The TiO2 nanobelts with different ZnSe content were characterized using UV-Vis absorption and visible-light phtocatalysis. The measurement results revealed that they exhibited obvious visible-light absorption in the wavelength range of 400-500nm, and to some extent, the product with less ZnSe content showed higher photocatalytic activity in the degradation of Rhodamine B than that on TiO2 nanobelts, but the product with more ZnSe content only exhibited slight visible-light photocatalytic activity.
  • Electroless Cu-Fe3O4 (nanometer) Composite Coating on PET Fabric
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    . 2010, 41(S3): 38-0.
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    Electroless composite coating of Cu-Fe3O4 nano particles on PET fabric was operated in the laboratory. The Cu-Fe3O4-coated fabric was investigated by means of SEM, EDX, XRD and TG. The electromagnetic shielding performance, surface specific resistance and abrasion resistance were also measured. The results show that as compared with the Cu-plated fabric, the onset decomposition temperature of the Cu-Fe3O4-plated fabric changes a little. The plating rate decrease at first, and then increases with the increase of the addition of nano Fe3O4 particles. The abrasion resistance for the Cu-Fe3O4-coated fabric is slightly increased. The grain size of the Cu-Fe3O4 coating decreases and the surface become uniformity by using sodium tripolyphosphate as dispersant. The shielding effectiveness of the Cu-Fe3O4-plated fabric is larger than that of the Cu-plated fabric when the weight gain rate is equal.
  • Encapsulation of cyclamen aldehyde via miniemulsion polymerization
    Jing HuZuo Bing Xiao ;;
    . 2010, 41(S3): 39-0.
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    Encapsulation of cyclamen aldehyde(CA) was obtained via miniemulsion polymerization successfully in this paper. The influence of the reaction condition such as emulsifier content, the ratio of CA and poly(tert-butylacrylate) and hexadecane content on the average diameter, Particle distribution Index, encapsulation efficiency and fragrance content in nanocapsule of CA nanocapsule was investigated in detail. The structure of CA nanocapsule was determined by Fourier Transform Infrared Spectrometry(FT-IR), Transmission Electron Microscope(TEM) and gas chromatography(GC). FT-IR displayed that CA had been encapsulated into PtBA. TEM showed that the diameter of the spheric CA nanocapsule kept100nm and dispersed even. The light color part was CA, the dark color part was PtBA. GC indicated that the fragrance strength released from the cotton fabric aromatized with CA after washing 10 times was decrease by 30.17% in contrast to that without washing; the fragrance strength released from the cotton fabric aromatized with CA nanocapsule after washing 10 times was only declined by 8.39% in contrast to that without washing. CA nanocapsule had the better fragrance sustained release property than CA.
  • The effect of crossed-laminar structure on mechanical properties in mollusk shell
    . 2010, 41(S3): 40-0.
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    The mollusk shells, as a simple biominerals, have developed a rigid calcified shell to protect the soft body against environmental pressures and predators. The paper has studied the effect of the crossed-laminar structure and organic matrix protein on mechanical properties of nanoindentation of the Hemifusus tuba conch shell. The results showed that the states of the organic matrix protein were different before heated and after heated, and which changed the mechanical properties of mollusk shells. After heated the mechanical properties decreased seriously. Thus applying the interface models of organic protein and inorganic crystal in the crossed-laminar structure between former and after heating states preferably explain that the mechanical properties are not only correlative to unique microstructure, but also relate with the organic matrix and the bond between the organic matrix and inorganic mineral.
  • Effects of Granularity on the Reflectivity of SmBO3 Powders
    Han Peng De
    . 2010, 41(S3): 41-0.
    Abstract ( ) Knowledge map Save
    Effects of granularity of SmBO3 powders on the scattering and absorption were analyzed. Mie scattering was mainly considerd for laser protective functional filler against laser scattering. If the mass of laser protective functional filler was constant , the particle size was smaller, particle counts was more, light absorption cross section and the absorption coefficient were greater. For SmBO3 laser protective functional filler, refractive index n=1.95, the laser wavelength was 1.06 μm. It can be obtained that scattering area ratio of was the largest when χ was 1.771 from the diagram of scattering area ratio Q (λ) as a function of particle size parameter χ. At this time, 2πr/λ was 1.771 and so r was about 298 nm. Therefore, when the particle size was about 600nm, the scattering extinction of SmBO3 was the strongest. In the wavelength range of 1.05 μm to 1.15 μm, with the particles growing up, the reflectivity at 1.06 μm decreased, and it reached the minimum value of about 0.5% as the the particle size was about 587 nm. As the particle size further grew up, reflectivity values increased. When the particle size was about 1 μm, the reflectivity reached about 0.6%. It was consistent with the result of theoretical calculation that the best scattering extinction particle size of SmBO3 powders was about 600 nm. 1.06 μm laser direct tests showed that the reflectivity was the lowest when the granularity of SmBO3 powders was 600 nm. It was also consistent with the result of theoretical calculation.
  • In-situ synthesis of nano-Ceria on cotton fabric and its UV resistant performance
    . 2010, 41(S3): 42-0.
    Abstract ( ) Knowledge map Save
    A simple in-situ synthesis method was used to prepare nano-ceria on the surface of cotton. TEM, SEM and XRD were used to characterize these cerium oxide nanoparticles, and the testing results of UV-Vis illustrated that these nano-ceria could improve the UV resistant property of cotton very clearly. These CeO2 nanoparticles have very strong connection with the surface of cotton based on the in-situ synthesis method, which make the UV resistant performance of cotton can maintain for a very long time even washed by water. This method applie an possible way for industry application of nano-functional fabric.
  • Synthesis and Characterization of Titania photonic crystal
    . 2010, 41(S3): 43-0.
    Abstract ( ) Knowledge map Save
  • Design Optimization of Amorphous Alloy Cladding Material in Electromagnetic Shielding Field
    . 2010, 41(S3): 44-0.
    Abstract ( ) Knowledge map Save
    Amorphous alloy has been important in the field of metal application. This article measured shielding effectiveness of typical amorphous alloy cladding material, and analyzed factors affecting shielding effectiveness. Optimal condition of chemical plating was obtained. This work afforded theoretical basis for applying amorphous alloy cladding material in the field of electromagnetism shielding. At the meantime, a universal optimization method was afforded for amorphous alloy cladding plating being applied to other application field.
  • Structural Control of Porous Silica thin films under alkaline condition
    . 2010, 41(S3): 45-0.
    Abstract ( ) Knowledge map Save
    Porous silica film was prepared through sol–gel process and impregnation method with a precursor sol containing of tetraethoxysilane(TEOS)in base catalyst . The influence of the content of anamoni on the performance of the SiO2 sol and coating was studied in detail. Thermal stability in drying process of the SiO2 sol were studied by Netzsch Thermal analyzer; The structure and morphology of these samples were characterized by SEM; The optical properties of porous silicon thin film were studied by spectrophotometer. It’s found that the viscosity of silicon sol was impervious to the increase of the NH3/TEOS molar ratio,whereas its optimal time for coating was shortened; By increasing the content of anamonia，the size of SiO2 particles increases. Doping organic additive N, N - DMF can improve the performance of the film, effectively control the growth of particles.The SiO2 sol catalyzed by NH3 had the high transmittance, which the peak value are all above 99% between 640～690nm.
  • Oxidation-resistant properties of a Co-Cr-Ni-W alloy
    ;
    . 2010, 41(S3): 46-0.
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    The oxidation-resistant properties of a Co-Cr-Ni-W alloy were investigated in this article. It was found that oxidation mass gain from the formation of surface CoO film fitted to the linear law before 100h at 900℃ because the protected oxidation film was not formed at this stage, and oxidation mass gain fitted to the parabolic law after 100h because the protected oxidation film was formed which made oxygen become difficult to diffuse into the matrix and react with the metal elements. Oxidation at 1000℃ was more serious than that at 900℃. The oxidation mass gain kept with the linear law before 50h at 1000℃, then entered into the parabolic stage earlier. The equation between the oxidation rate and temperature for this alloy is ; oxidation active energy was 234467.
  • The fluorescence properties and applications of europium doped TiO2
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    . 2010, 41(S3): 47-0.
    Abstract ( ) Knowledge map Save
    In this work, using Eu2O3 as the fluorescent precursor, the Eu3+/TiO2 nanocrystals are synthesized by the sol–gel method. Morphologies, compositions and structures of the samples are characterized. The results show that the average diameter of particles is about 5 nm. The Eu3+ contents (molar ratio) in the samples are 0, 0.5%, 1%, 2%, 3% and 4%. Excitation with a wavelength of 468 nm result in photoluminescent emission. The photoluminescence of Eu3+ in Eu3+/TiO2 nanocrystals has the strongest emission intensity at 2% of Eu3+ concentration. Fluorescence microscopy is adopted to investigate their emission fluorescence of onion epidermal cells.
  • The relation between micrograph and unconfined compression strength of soil stabilized with Perma-zyme at the early curing stages
    . 2010, 41(S3): 48-0.
    Abstract ( ) Knowledge map Save
    The clay loam specimens were stabilized with Perma-zyme in proper proportion. The unconfined compression strengths of specimens are higher than those without Perma-zyme at the early curing stages. To investigate the relation between micrograph and strength of the soil stabilized with Perma-zyme at the early curing stages, the micrographs of the specimens and the specimens without Perma-zyme were studied in scanning electron microscopy (SEM) at 7, 14d of age. The SEM micrographs(40?m) of the specimens and the specimens without Perma-zyme are difficult to complete the qualitative analysis from direct observation. Fractal dimension values of SEM images were computed by box-counting. Fractal dimension values of SEM images of the specimens without Perma-zyme are larger than those stabilized with Perma-zyme at 7, 14d of age. The unconfined compression strength of specimen with larger fractal dimension value is lower at the same early curing stage. When unconfined compression strength of the specimen increases, the fractal dimension value decreases as the curing age increases from 7d to 14d.
  • Surface Ni-Ti co-diffusion of Ti6Al4V by plasma surface alloying technology
    . 2010, 41(S3): 49-0.
    Abstract ( ) Knowledge map Save
    Abstract: Using equal atomic ratio Ni-Ti alloy plate as the sputtering source, a titanium nickel layer on surface of Ti6Al4V alloy was fabricated by double glow plasma surface alloying technology. Effects of temperature, working pressure, cathode voltage, workpiece voltage on composition were studied. Suitable technical condition was obtained. Composition, micro-structure, phase structure and micro-hardness of the alloyed layer were analyzed. Friction and wear test was also carried out. The results indicated that after 3h Ni-Ti co-diffusion under 900℃, 35Pa, thickness of alloyed layer is about 18.69μm, composition of the alloyed surface layer changes gradually from surface to substrate. Wear resistance of Ni-Ti alloy layer increased significantly compared with the untreated substrate material.
  • Synthesis and properties of organosilicon quaternary ammonium with epoxy group
    LI Junying
    . 2010, 41(S3): 50-0.
    Abstract ( ) Knowledge map Save
    Diethyl-2,3-epoxypropyl-[3-methyl- dimethoxyl)]silpropyl ammonium chloride（DEEPSAC）was synthesized and its properties such as surface-activity and anti-bacterial ability were studied. The surface tension measurement showed DEEPSAC has obvious surface activity and the critical micelle concentration is 2.6mmol/L. The plate count method experiments showed that DEEPSAC had 100% antibacterial rate against Escherichia coil at the concentration of 0.10%. Kinetic studies indicated that the quaternization reaction series was not in accordence with the traditional second-order and influenced by temperature, as well as DEEPSAC concentrations.
  • Preparation and Properties of Chitosan-based Porous Membranes
    Ma Yan
    . 2010, 41(S3): 51-0.
    Abstract ( ) Knowledge map Save
    Abstract:In order to prepare chitosan-based porous membranes of simple formula and good performance , the film was prepared by freeze-drying. To integrate the appearance of membrane,pH,water absorbance and water vapor permeation , we got the proper formula by the research.The structure and properties were characterized by SEM(scanning electron microscopy) and TGA(thermogravimetric analysis).The proper formula and conditions is obtained by research:3% chitoan 31.5 mL，Glycerin 3.5 mL，CMC 0.4g，NaHCO3 0.1g； Mix intensely, and pre-freeze for 7h ,then freeze-dry .The result of antibacterial and degredation tests shows: the porous membranes has good performance on antibacterial and degredation property,The film is a kind of ideal wound dressing.
  • Preparation of Uitrafine Multicolored Fluorescent Materials Sr2CeO4/Re(Re=Pr,Nd,Eu) by Citrate-Gel Method
    chen qiao ping;xiao yan chun;gao feng feng;xie hong fang;chen zhen zhen
    . 2010, 41(S3): 52-0.
    Abstract ( ) Knowledge map Save
    Abstract: Luminescent powders of Sr2CeO4/Re doped with rare-earth elements Nd, Pr and Eu were synthesized by citrate-gel method. The samples were characterized by X-ray diffraction, fluorescence spectrometer analysis and the spectrophotometer analysis. The synthesized materials Sr2CeO4/Re show excellent luminescence properties, such as broadband emission and excitation spectra. The excitation spectra is from 300 nm to 480nm and the main emission peak is at 475 nm. The size is as small as 1-2μm diameter.
  • Preparation of ultra-lightweight fly ash ceramic (ULFAC), investigation and application of the bloating mechanism
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    . 2010, 41(S3): 53-0.
    Abstract ( ) Knowledge map Save
    Fly ash and clay were used in the preparation of ultra-lightweight fly ash ceramic (ULFAC) with no forming agent added. The chemical components and mineral phases of FA and clay were determined by EDX and XRD,respectively, and the thermal properties of FA were determined by DSC/TGA. Then FA and clay were mixed in different dosages and sintered into ceramic. The physical properties and microstructure properties were determined, respectively. The results shows that clay was not suitable for the preparation of ultra lightweight or lightweight ceramic with nothing added, but when the addition of FA was 10%~20%, it was suitable for the preparation of ultra lightweight ceramic. The SEM images indicate the ULFAC are porous. Abundance of Fe2O3 in FA and base metal in clay is the reason for the bloating properties of ULFAC. The bloating properties of ceramic happened when the glassy phases: gaseous components :flux was ≈78.5:4.0:16.5.
  • Formation and characterization of chromatic Ti–Zr based conversion layers on AA6063 aluminum at room temperature
    LIU Ning-Hua
    . 2010, 41(S3): 54-0.
    Abstract ( ) Knowledge map Save
    The chromatic Ti-Zr conversion layers were prepared on the surface of AA6063 aluminum alloy. The surface morphology and composition of the conversion films were investigated by SEM/EDX and their corrosion performance was examined by electrochemical workstation and dropping test, and the film-forming mechanism and anti-corrosion mechanism of the chromatic Ti-Zr based conversion layers were discussed. The results show that the chromatic conversion layers was generated and it’s honeycomb and more compact after adding the manganese salt and the organic acid, however the corrosion potential and the corrosion current of conversion layers decreases obviously. It reveals that adding the manganese salt and the organic acid into the titanium-zirconium solution can further suppress the catholic reaction of aluminum alloy, thus improving the anti-corrosion behavior of aluminum alloy efficiently.
  • Transversal thermovoltaic effect between two nc-Si:a-Si films with different crystallization degree
    Liu Li HuiGao Fei;;;
    . 2010, 41(S3): 55-0.
    Abstract ( ) Knowledge map Save
    Two transversal contacted nanocrystalline Si (nc-Si):amorphous Si (a-Si) films with different crystallization degree has been prepared on a quartz substrate by crystallizing a 200 nm thick amorphous Si (a-Si) film using two different thick Al films (50nm and 100nm) deposited on it, and annealing at 600℃ for 45 min, in N2. The structural properties of the prepared films has been studied by XRD, Raman, SEMand TEM. For the nc-Si film induced by thicker Al film the average size of nc-Si is 25 nm and its crystallization rate is 56%. For the nc-Si film induced by thinner Al film the average size of nc-Si is 15 nm and its crystallization rate is 23%. It is found that there is a transversal thermovoltaic effect between the two nc-Si films, which is uniformly heated in the absence of external temperature gradients. The open circuit voltage and short circuit current is 1.2 mV/40 nA at 273K, 25 mV/1.171μA at 373K.
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