15 December 2013, Volume 44 Issue 23

    

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研究 开发
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  Influence of the temperature on the compression properties of LVL wood composite

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  . 2013, 44(23): 1-0.

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  The influence of temperature, in a range from 20℃ to 225℃, on the compression properties of LVL wood composite specimens was determined by static compression test. The result indicated that the compression strength and modulus of elasticity of LVL wood composite specimens decreased significantly with increasing temperature. Compression strength and modulus of elasticity at 225℃ relative to room temperature 20℃ was respectively 22.3 % and 22.2 %. A statistical regression-based model was developed and evaluated for predicted the strength loss of LVL composite wood as a function of thermal exposure temperature. The predicted theoretical results consistently matched the observed values.
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  Thermal conductivity enhancement of form-stable HDPE/paraffin by expanded graphite addition

  Xiang-Lei WANG ;;;

  . 2013, 44(23): 2-0.

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  Form-stable phase change composites were prepared by melt blending and hot-compaction of paraffin, expanded graphite (EG) or flake graphite (FG) and high density polyethylene (HDPE). In the composites, paraffin serves as a latent heat storage material, EG or FG as a heat transfer promoting agent and HDPE as a matrix. Phase transition temperatures, latent heat values and thermal conductivity values of the composites have been measured. In order to prevent the leakage of melting paraffin in the composites, the minimum weight percent for HDPE is 35%. The latent heat of the composites increases with increasing mass ratio of the paraffin in the composites. EG and FG can improve thermal conductivity of the composites significantly. When the addition of EG was in the ratio of 10wt%, thermal conductivity of the PCM was up to 2.50 W/m K, more than 6 times of that without any additives, which was much better than that by addition of FG.
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  The research of immobilized laccase with chelated nanofibers

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  . 2013, 44(23): 3-0.

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  Electrospun PAN nanofiber was modified into a chelating fiber containing amidoxime group amidoxime, and then Cu2 + or Co2 + was fixed on the AOPAN nanofibers by coordination bonds to forma chelated nanofibers. Finally laccase was immobilized by the coordination reaction between laccase and Cu2 + or Co2 +. In this paper, the various stages of processing of PAN nanofibers were observed and analyzed by IR, SEM and EDAX. At the same time , the thermal stability, pH stability, storage stability and reuse stability of the immobilized laccase were researched. The results showed that the optimum temperature immobilized laccase with chelated nanofibers was 50 ℃and the optimum pH was 3. The storage stability of immobilized laccase increased 30% -45% comparing with the free laccase and had a certain reusability .
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  Acoustic metamaterial based on hollow steel tube structure

  Hong-Cheng ZENG;;Jun Huai CHEN;Lin Chang DING;shi long ZHAI;

  . 2013, 44(23): 4-0.

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  We present a hollow steel tube (HST) “meta-atom” structure model, which can achieve the negative effective mass density by acoustic transmission experiments and numerical results. To illustrate the structural properties of the HST, we study the transmission properties when hollow steel tube microstructure geometry(such as hollow steel tube diameter) changes, the results show that the change of the HST geometry affects transmittance band gap frequency of acoustic metamaterials.
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  The micellization behavior of amphiphilic polymer contains tertiary amino-substituted methacrylates in aqueous solution and its application on drug-controlled release system

  Qun ZHAO

  . 2013, 44(23): 5-0.

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  The micellization behavior of the diblock copolymer BzO-PDMAEMA30-b-PMMA10 in aqueous solution were investigated by the measurements of fluorescence probe techniques and laser light scattering studies. Using naproxen as model hydrophobic drugs and using vitamin C as model hydrophilic drugs, the application of amphiphilic polymer on controlled-release drug delivery systems were investigated by UV-visible spectrophotometer. The results demonstrated that the release rate of naproxen from polymer micelles were significantly faster drug release by reducing of pH values. Furthermore, the release rate run faster by increasing of temperature. Any initial burst release was not observed in the experiments. The drug-controlled release showed pH-responsive and thermoresponsive.
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  Electrocatalytical performance of the activated and the nitrogen-doped carbon layer coated carbon nanotubes loaded with platinum

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  . 2013, 44(23): 6-0.

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  Electrocatalysts of pristine carbon nanotubes (CNTs), activated CNTs from the mixed acid oxidation and nitrogen-doped carbon layer coated CNTs (NCNTs) from modification of polyaniline (PANI), loading with platinum, were prepared by using chemical reduction of immersion. The electrocatalytical performance of these platinum loaded CNTs as the catalysts of proton exchange membrane fuel cell (PEMFC) was studied. The TEM observation showed that the morphology and distribution of platinum particles onto the CNTs can be improved by using the activated CNTs as supports of catalyst. Particle size of platinum distributed on the activated CNTs is about 4 - 8 nm, but the obvious agglomeration can be observed. For the NCNTs from the modification of PANI, platinum particles with size of 2 - 4 nm are uniformly distributed on the NCNTs surface owing to the uniform nitrogen doped layer coated on the CNTs. Electrochemical analyses showed that both the activation and nitrogen doping on the CNTs can improve the activity of catalysts supported on CNTs, especially that platinum loaded NCNTs not only possess the best activity of oxygen reduction but also exhibit a good cycling stability.
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  Effect of TiCN and Mo addition on microstructure and mechanical properties of iron matrix composites

  Min CHEN; LIU Sheng-Ming ;;

  . 2013, 44(23): 7-0.

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  In this paper, the iron matrix composites were prepared using titanium carbonitride composite powder as the reinforcement which was obtained via carbothermic reduction of ilmenite with low cost. The effect of composite powder contents on the microstructure and properties of iron matrix composites was studied with Metallographic observation, SEM&EDS and mechanical properties testing. The effect of Mo addition on the microstructure and properties of iron matrix composites was further studied. It is shown that the iron matrix composites had better performance when the content of composite powder was 40wt%. With small amount of Mo addition, the average particle size of enhancement decreased and mechanical properties were improved.
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  Synergistic Effect of Ce and Zn co-doped on Antibacterial Activity of TiO2

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  . 2013, 44(23): 8-0.

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  Ce and/or Zn doped TiO2 nano-materials were prepared by sol-gel. The antibacterial activity of the as-prepared materials under visible light irradiation was evaluated on Candida albicans, Escherichia coli and Staphylococcus. X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller surface area (BET) analysis, fourier transform infrared spectroscopy (FT-IR) and UV-vis diffuse reflectance spectra (DRS) methods were employed to characterize the as-prepared materials. It has been shown that the role of proper amount of Ce in doped materials played as to inhibit grain growth and extend the light response to the visible region have a favorable effect on the photocatalysis. The role of proper amount of Zn in doped materials played as to enhance the photocatalytic antibacterial activity of as-prepared materials. Zinc and cerium co-doped TiO2 nano-materials exhibit significant synergistic antibacterial effect and the synergistic effect factor is greater than 0.
工艺 技术
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  The Synthesis and Characterization of Monodisperse TiO2 microspheres

  Zhen-Feng ZHU

  . 2013, 44(23): 9-0.

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  The monodisperse TiO2 microspheres was pepared through Tetrabutyltitanate hydrolysis in ethanol controlled by KCl solution. The morphology and structure of TiO2 microspheres were characterized by XRD analysis and SEM. The results indicate that the added KCl solution suppressing the agglomeration and growth of TiO2 in the hydrolysis of Tetrabutyltitanate, obtained uniform and monodisperse TiO2 microspheres. As the KCl concentration in system increases , the size of the microspheres become smaller gradually.
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  Influence of Temperature on Formation of Titanium Carbide, Titanium Nitride under Carbothemal Reduction

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  . 2013, 44(23): 10-0.

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  The influence of temperature on the formation status of titanium carbide, titanium nitride prepared by carbothemal reduction method was studied. Blast furnace slag - bearing titanium samples were subjected to 6 hours for isothermal treatment with the temperature range of 1300℃-1550℃ in graphite crucibles with Nitrogen flow. The temperature on the formation of titanium nitride and titanium carbide were 1350℃ and 1500℃ in the experiments separately，which matched substantially with the calculation of FactSage (they were 1322℃ for titanium nitride and 1467℃ for titanium carbide respectively). The longitudinal profiles of melted slag and graphite crucibles were characterized mainly by mineralogical microscope and SEM-EDS detection methods. As a result, the area of titanium nitride and titanium carbide mainly concentrated on the junction of melted slag and graphite crucible, whose amount were increased and which were diffused to the center of the slag as the temperature rose.
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  Hydrothermal Synthesis and Characterization of Hollow SnO2 Microsphere with Open Structure

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  . 2013, 44(23): 11-0.

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  Hollow SnO2 microspheres with an open structure were successfully synthesized by hydrothermal method, using sodium stannate and urea as starting materials. Effects of concentration of urea and hydrothermal time on the formation of hollow SnO2 microspheres were studied. The as-prepared samples were characterized by XRD, SEM and TEM and the formation mechanism of hollow spheres was discussed. Results indicate that hollow SnO2 microspheres with a diameter of about 2 μm have a shell thickness of ca. 250 nm and are built from nanosheets or nanocrystals. Urea not only played an important role in the SnO2 self-assembly into microsphere, but also acts as the soft template resource for the formation of hollow structure. Meanwhile, this special open structure formed by the escaping of bubbles provides fast channel for the introducing of functional particles and has a very good application prospects.
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  Synthesized of titanate nanowhiskers and Adsorption of Th(IV)

  Jian-Liang LIU; ;;

  . 2013, 44(23): 12-0.

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  Titanate nanowhiskers have been synthesized by a hydrothermal method using titanium dioxide rutile as titanium source. The determination of the structure and morphology was characterized by by XRD, FTIR, SEM and TEM. The results indicate that the titanate nanowhiskers successfully synthesized under hydrothermal conditions of 180℃. The adsorption of Th(IV) on titanate nanowhiskers was studied as a function of contact time, pH values, ionic strength, Th(IV) initial concentration and temperature under ambient conditions using batch technique. The results indicate that adsorption of Th(IV) on titanate nanowhiskers is strongly dependent on pH values, but weakly dependent on ionic strength; Adsorption kinetics of Th(IV) on titanate nanowhiskers is in accordance with pseudo second order kinetic model; The adsorption isotherm model consistent with Langmuir isotherm and Freundlich isotherm model. △Go, △Ho and △So free energy were calculated from experimental data, The results indicate that the adsorption of Th(IV) on titanate nanowhiskers is a spontaneous and endothermic process, and increases with increasing temperature. The adsorption of Th(IV) on titanate nanowhiskers is mainly dominated by surface complexation.
研究 开发
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  Study on Infra-red spectra of microbe cementitious materials

  Hui RONG

  . 2013, 44(23): 14-0.

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  Microbe cement is a new kind of biological cement due to the ever increasing awareness of environmental protection. The composition, morphology and microstructure were researched by X-ray diffraction (XRD), Transmission electron microscope (TEM) and Infra-red spectra (IR). TEM results showed that the microstructure of microbe cementitious materials is different with that by chemical methods. The calcite produced by microbial could bind loose particles and that produced by chemical methods could not bind particles. IR results indicated that the frequency of Si-O and C-O took up the extent of the red shifts. However, the frequency of Si-O and C-O could not change. Moreover, the frequency of Si-O at quartz sand by chemical method and at pure quartz sand was the same.
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  Effect of Substrate temperature on the Structure and Optical Properties of the Ta2O5 thin film

  ;;;;Chaoyong Deng

  . 2013, 44(23): 15-0.

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  Ta2O5 thin films were prepared by reactive magnetron sputtering technique. The microstructure, morphology and optical properties of the films deposited at different substrate temperature were investigated by X-ray diffraction, scanning electron microscopy (SEM) and spectrophotometer. The Ta2O5 thin film begin to be crystallization when substrate temperature reach to 450℃. The films are amorphous less than 450℃, and the transmittance of thin films will increase with enhance the substrate temperature. The highest transmittance during visible light region is 85%. In other hand, when the films are crystallization, they will produce a lot of crystalline particles, which will produce scattering, reduce the transmittance. The results show that substrate temperature has a close relationship with the structure and crystalline properties and optical properties of the Ta2O5 thin films.
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  Effect of chemical admixtures on air void structure and hydration of concrete

  Hui GAO ;

  . 2013, 44(23): 16-0.

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  The effects of the regulated components (H) on the air void structure and properties of air-entraining concrete were studied. In addition, the hydration degree and the phase compositions of cement pastes were studied by thermogravimetry-differential scanning calorimetry (TG-DSC) and X-ray diffraction (XRD). The results show that when the dosage of H is 0.2‰, the comprehensive performance of concrete achieves the best. The average air void diameter and mean free spacing in air-entraining concrete are decreased and its compressive strength can be improved due to the increase of the porosity of the air void size ranging from 10μm to 200μm and decrease of the porosity ranging from 200μm to 1600μm. Furthermore, the effect of chemical admixtures on the degree of cement hydration is not remarkable and no new phase in cement pastes formation.
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  Preparation and characterization of three dimensional porous Silk Fibroin/Gelatin composite scaffolds

  ;Peng PENG;;;;

  . 2013, 44(23): 17-0.

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  【Abstract】In this study, different mass ratio SF/G three dimensional porous composite scaffolds were made by freezing-dry method in different freezing temperature to explore the effect of mass ratio and freezing temperature on pore structure and performance of three dimensional porous Silk Fibroin/Gelatin composite scaffolds. The morphology of the SF/G scaffolds was observed under a scanning electron microscope;the structure of the scaffolds was evaluated by X-ray diffraction;the water absorption、porosity and thermostability were also calculated. The result shows that the pore structure、water absorption and porosity of the scaffolds can be controlled by adjusting the mass ratio of material and freezing temperature,and more stable scaffolds with higher thermostability can be created with the method of blending and modifying silk fibroin and gelatin.
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  Adsorption Mechanism of Lead (II) Ions on Natural Magnetite from Aqueous Solution and Effect of pH value

  Bin-Hui JIANG ;;;;

  . 2013, 44(23): 18-0.

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  In the present investigation, the natural magnetite was employed in studies on the adsorption effects of pH during the removal of Pb(II) ions from aqueous solutions by static batch experiments, and the adsorption kinetics and isotherms were also studied. The magnetite was characterized by SEM and XRF before and after sorption in order to analyze the mechanism on Pb2+ adsorption. The results demonstrated that it had a better efficiency on Pb2+ adsorption as the initial pH value increased and the adsorption rate was 97.8% while pH value was 6. When the conditions were magnetite particle size 100-120 mesh, magnetite initial concentrations 20g/L, pH value 5, temperature 30℃ and shaker rotational for 30 min at speed 160 r/min, respectively, the saturated adsorption capacity was 16.98 mg/g. It was concluded that the Langmuir isotherm was more suitable to fit equilibrium adsorption data, and the adsorption kinetic data for Pb2+ onto magnetite particles fitted by pseudo-second-order equations with Y=0.0986X+0.5435 model, R2=0.9923 and k2=0.0179g/mg/min. Furthermore, Pb2+ adsorbed onto the magnetite existed in PbO or Pb2O3. The adsorption mechanism contains the coordinated actions of superficial deposit, physical adsorption and chemical adsorption.
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  Properties of GaN Film Grown by Hydride Vapor Phase Epitaxy

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  . 2013, 44(23): 19-0.

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  The high crystal quality GaN film has been successfully grown by hydride vapor phase epitaxy (HVPE) and the properties of GaN epilayers have been investigated by high–resolution X–ray diffraction (HRXRD), Raman and Photoluminescence (PL) measurements. The temperature dependence of photoluminescence has been studied particularly. X–ray rocking curves (XRC) show that the full widths at half maximum (FWHM) of (002) and (102) are 322 and 375arcsec, respectively. Temperature–dependent PL spectra find that the neutral donor bound excitons (D0X) emission and free A–excitons recombination peaks reflect the shrinkage of the band gap, but the peak energy and the integrated intensity of 1–longitudinal optical (LO) phonon replica of the free A–excitons exhibit non–monotonic variations with temperature increasing, which may be related to the exciton–polariton dispersion effects of the free excitons caused by gain extra kinetic energy with increasing temperature. HRXRD measurements, Raman and PL spectra all reveal that biaxial in–plane compressive strain (about 0.26GPa) exists in the GaN layer and the results deduced from the three methods are in good agreement.
工艺 技术
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  Metal matrix-containing hydrotalcite sol-gel self-healing coating and its corrosion resistance

  ;;li qing

  . 2013, 44(23): 20-0.

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  In this work, hydrotalcite (HT) powder was prepared by the classical co-precipitation method using magnesium and aluminum nitrates as precursors. Different weight percentages (5, 10 and 15 wt.%) of hydrotalcite were added to sols. The sol–gel coatings were deposited by spin-coating method on AZ91D magnesium alloy substrate. Scanning electronmicroscopy (SEM) revealed the distribution of the agglomerates. The corrosion performance was evaluated by Electrochemical Impedance Spectroscopy (EIS). The results showed a marked improvement of the corrosion resistance on the sol-gel/magnesium system when hydrotalcite was added to the sol–gel coating. And the healing effects may be due to the anion exchange capacity of hydrotalcite.
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  Preparation of Calendula-like Nano-ZnO Induced by Nano-Lignin and Its Photocatalytic Performance

  . 2013, 44(23): 21-0.

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  Calendula-like nano-ZnO was prepared by hydrothermal method using nano-lignin as morphology-inducing and coordinate agent with zinc nitrate and ammonia as raw materials.The crystalline characteristic and microstructure of samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM),the photocatalytic performance of samples were also investigated.The results show that nano-lignin can induce nano-ZnO in its surface deposition and growth,forming calendula-like nano-ZnO which grain size is 42.3 nm,the ultraviolet degradation efficiency of which for malachite green is 91.3% within 2.5 hours at room temperature.
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  Fabrication and magnetic properties studies of BaNix/2Cox/2ZrxFe12-2xO19 nanoparticles

  Yong Ren

  . 2013, 44(23): 22-0.

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  Ni-Co-Zr substituted BaM ferrite particles are prepared by the sol-gel method, the influence of substitution on microstructure and magnetic properties were studied. Phase structure and microscope image of sample were investigated by X-ray diffraction and scanning electron microscopy, its static magnetic properties was studied by a Vibrating sample magnetometer. Complex permeability and permittivity were measured using a vector network analyzer (Agilent E5071C) in the frequency range of 0.1-14GHz. Furthermore, coercivity of BaFe10 Ni0.5Co0.5Zr1O19 is only 93.1 Oe and saturation magnetization is 28.6 emu/g after heat treatment at 1100 ℃ with 4 hours, and coercivity of BaFe10.4 Ni0.4Co0.4Zr0.8O19 is 581.4 Oe, the saturation magnetization is 50.2 emu/g. The dielectric properties of the doping BaM have certain influence at the frequency range. With increasing Ni-Co-Zr substitutions, μ′ will be increased after a decrease that reduced the material application scope. Meanwhile, Ni-Co-Zr ion doping makes grain of product refinement, activity increase.
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  Preparation and properties of palygorskite thermostability antibacterial paperboard

  qiong ZHANG

  . 2013, 44(23): 23-0.

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  Abstract: Palygorskite fibre was Combined with bamboo fiber and silver type zeolite antibacterial was added with the method of addition in pulp to make thermostability antibacterial functional paperboard,the paperboard can be used to base paper of the high-grade multi-fonction wallpaper.The fibre composition,the adding amount of additives and antibacterial quantity added to the influence of the performance on paperboard were discussed by using orthogonal test,and the properties of paperboard were tested respectively,including whiteness,bursting strength,tearability,ignition loss,antibacterial property and so on.The results show that the best condition of the experiment is: palygorskite:bamboo fiber=85:15,CPAM:2.0%,antibacterial:20%,following the above condition,every properties of the paperboard is the best,where quantitative value is 154g/m2,thickness is 0.32mm,tightness is 0.482 g?cm-3,whiteness is 71.35,tearability is 20 mN, bursting strength is 109 kPa,ignition loss is 0.45%,the inhibition zone diameter for escherichia coli and staphylococcus aureus are 24-26mm和23-24mm respectively.
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  Preparation and Characterization of N-halamine modified β-cyclodextrin copolymers/cellulose acetate Nano-Fibers

  Rong LI;;;

  . 2013, 44(23): 24-0.

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  As one of starch derivatives, β-cyclodextrin (β-CD) has received more and more attentions due to its excellent properties, such as rechargeable, biodegradable, low price, etc. In this work, a polymerizable monomer (β-CD-MAH) was obtained by using maleic anhydride (MAH) reacted with the β-CD. Antimicrobial polymer β-CD-MAH-VBDMH was synthesized by the reaction between β-CD-MAH and 3-(4′-vinylbenzyl)-5,5-dimethylhydantoin (VBDMH) using ammonium persulfate (APS)/sodium hydrogen sulfite (SBS) Oxidation - reduction system as initiator, and characterized by solid-state 13C NMR and FTIR. The electrospinning nanofibers were obtained by mixing solution of the synthesized antibacterial polymer β-CD-MAH-VBDMH and cellulose acetate (CA). The optimum condition was determined by SEM. The chlorine content of the chlorinated nanofibers under the optimum condition was determined by iodometric titration, and indicated that the chlorinated nanofibers would have good antibacterial property.
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  Effects of pre-sintering temperature on machinability of 3Y-TZP dental ceramic by slip casting

  Yu-Fei TANGKang Zhao ;;

  . 2013, 44(23): 25-0.

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  3Y-TZP (ZrO2 doped with 3mol%Y2O3) dental ceramic is fabricated by slip casting and two step sintering method (pre-sintering- processing-final sintering). Effects of pre-sintering temperature on its sintering shrinkage, Vickers hardness, fracture toughness and wear loss were investigated. The machinability is evaluated by combination of the brittleness index and the wear loss. Also, the micro-morphology and the mechanical properties of 3Y-TZP are characterized after final sintering. Results show that the shrinkage, Vickers hardness and fracture toughness of 3Y-TZP samples are enhanced and the unit area wear loss decreases when the pre-sintering temperature increases. The brittleness index of 3Y-TZP is 244.6 when it is pre-sintered at 1250℃. The pore drilled by high speed turbine dental drill has sharp edge and no cracks. The gain size of 3Y-TZP increases after final sintering at 1500℃ and the Vickers hardness and the fracture toughness are 953 kgf?mm-2 and 3.66 MPa?m1/2 respectively. It can meet the requirements of dental materials on the mechanical properties.
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  Preparation and characterization of Regenerated Bacterial Cellulose membrane

  Yong-Jun ZHU; ;;

  . 2013, 44(23): 26-0.

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  In this work, regenerated bacterial cellulose (RBC) membrane was prepared by Lithium chloride (LiCl)/ N, N dimethyl acetamide (DMAc) dissolution system, and the Influence of the concentration of bacterial cellulose solution on crystallinity, equilibrium water content, light transmittance and the diffusion of nutrients (sodium chloride, glucose sugar, tryptophan) of RBC membrane were studied. The experimental results showed that RBC membrane is promising biomaterial for ophthalmological optics application especially corneal lamellar transplantation.
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  Evolution of Texture and Precipitates in the High Temperature Annealing Process of Hi-B Silicon Steel Using Low Slab Reheat Temperature, Evolution of Texture and Precipitates in the High Temperature Annealing Process of Hi-B Silicon Steel Using Low Slab Reheat Temperature

  . 2013, 44(23): 27-0.

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  The annealing process at high temperature of Hi-B silicon steel using low slab reheat temperature and with AlN as the inhibitor has been studied by interrupting test，and the evolution of texture and precipitates during continuous heating-up in the annealing process at high temperature is analyzed by EBSD and TEM. The results show that Goss texture appears in ODF at 800℃,but the intensity of Goss texture is very weak and the deviation angle is more than 10°. Goss grains grow abnormally during 950℃~1000℃,and the deviation angles range from 3°to 6°. There are three different types of particles, the spherical, the small cubic and the polyhedron block. The Zener factor increases at first, then decreases due to the nitridization, and the precipitates are first coarsened in the front of Goss grain boundaries., The annealing process at high temperature of Hi-B silicon steel using low slab reheat temperature and with AlN as the inhibitor has been studied by interrupting test，and the evolution of texture and precipitates during continuous heating-up in the annealing process at high temperature is analyzed by EBSD and TEM. The results show that Goss texture appears in ODF at 800℃,but the intensity of Goss texture is very weak and the deviation angle is more than 10°. Goss grains grow abnormally during 950℃~1000℃,and the deviation angles range from 3°to 6°. There are three different types of particles, the spherical, the small cubic and the polyhedron block. The Zener factor increases at first, then decreases due to the nitridization, and the precipitates are first coarsened in the front of Goss grain boundaries.
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  Synthesis and Photocatalytic Activity for Hydrogen Production of Pt/Graphene-TiO2 Nanotube

  Sheng-Hui TU ;;;;;

  . 2013, 44(23): 28-0.

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  Graphene-TiO2 nanotube composites were synthesized by hydrothermal method, The micromorphology、structure and optical properties of the composite catalysts were characterized by scanning electron microscopy (SEM),transmission electron microscopy (TEM), X-ray diffraction (XRD), fourier transform infrared ( FT-IR),UV-Vis diffuse reflectance (DRS). Using H2PtCl6 as precursor, Pt load of composite materials, the C2H5OH/H2O solution as reaction liquid, to test the hydrogen production activity under UV light and sunlight irradition,.The experimental results show that, the activity for hydrogen production was highest in which the content of grapheme was 5wt%. The amount of evolution H2 was 1069.2988 μmol under the UV light and 3712.789 μmol under the sunlight irradtion for 5 hours,whose activity for hydrogen production were much higher than that of P25 under same condition.
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  Synthesis and Photo-catalytic Activity of Mesoporous TiO2 Fiber Using Collagen Fiber as a Template

  . 2013, 44(23): 29-0.

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  Mesoporous TiO2 ?ber was prepared using collagen ?ber as the template and Ti(SO4)2 as the titanium source. The Ti(IV) was loaded on collagen ?ber by chelation reaction, and then the mesoporous TiO2 ?ber was obtained after heat-treatment to remove the template of collagen fiber. The surface morphology and pore structure of the as-prepared mesoporous TiO2 ?ber were characterized by means of field emission scanning electron microscopy, N2 absorption-desorption isothermal method, low angle XRD, wide angle XRD and photoluminescence spectra (PL). The experimental results indicated that the mass ratio of Ti(SO4)2 to collagen fiber and calcination temperature significantly influenced the surface morphology and mesoporous structure of TiO2 ?ber. When the mass ratio was 8:5 and calcination temperature was 600 ℃, the morphology of nature collagen fiber was well preserved in the as-prepared mesoporous TiO2 fiber, and the mesoporous structure was in ordered and the pore size distribution was centered in 4.3 nm. The photo-catalytic degradation of acid orange II experiments indicated that the photo-catalytic activity of the as-prepared mesoporous TiO2 fiber was much higher than that of Degussa P25 without mesoporous structure.
综述 进展
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  Progress on Heat Insulation Performance of Thermal Barrier Coatings

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  . 2013, 44(23): 30-0.

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  Thermal barrier coatings (TBCs) is one of the important materials of turbines for propulsion and power generation with excellent thermal insulation properties and high-temperature oxidation resistance. The evaluation of thermal insulation performance of thermal barrier coatings has been an important indicator of good or bad performance．In this paper, research status and the latest progress about heat insulation performance are reviewed from the points of ceramic materials, preparing technology, microstructure of TBCs. Finally, the direction of research and development tendency of TBCs is presented.
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  The preparation and applications of rare earth oxide nanotubes

  MO zun li

  . 2013, 44(23): 31-0.

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  Abstract: Rare earth oxide has many excellent properties and great application value, because of its unique optical, electric and chemical properties, making it has great application prospects in catalysis, luminescence, magnetism. If the rare earth oxide was prepared into a lower dimension and high specific surface area of one dimensional nanotubes, it is possible to enhance the performance in various aspects, the development and application prospect is very fascinated.This article summarized an overview of the preparation method of rare earth oxide nanotubes, and introduces the progress of rare earth oxide nanotubes in catalysis, luminescence and magnetic applications. Finally discussed the need study problems and direction.
研究 开发
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  Effect of Mo Addition on the Properties of Pd/Al-Ti Monolithic Catalysts for Benzene Catalytic Combustion

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  . 2013, 44(23): 32-0.

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  Pd/Al-Ti monolith catalyst modified by Mo promoter were prepared by the wet impregnation method and tested for benzenne catalytic combustion. A series of Pd catalyst samples with different Mo contents were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed desorption of NH3, H2 temperature-programmed reduction, and N2 adsorption. The results showed that the addition of Mo effectively improved the activity of catalyst samples. Pd-Mo/Al-Ti sample with 5% Mo have the best catalytic activity and benzene conversion of 90% was obtained at temperature as low as 225 oC. The addition of Mo effectively improved the activity of catalyst samples by increasing the dispersion of Pd active components, adjusting acidity and increasing oxygen species concentration on the surface of catalyst. 0.10%Pd-5%Mo/Al-Ti catalyst have the same catalytic activity with the 0.25% Pd/Al-Ti catalyst.
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  Synthesis and Properties of Coumarin-based Probe Containing Benzothiazolyl for Copper Ion

  Xiang-Lin YU

  . 2013, 44(23): 33-0.

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  A novel coumarin-based fluorescence quenching probe has been designed and synthesized. After studying its recognition capability and bonding mode, we discovered that the probe could high selectively and sensitively detect Cu2+ in solution as well as having a high fluorescence quenches rate which is up to 95.2%. Additionally, there was a good linearity between the fluorescence intensity of the probe and the concentration of copper ion, when the concentration of Cu2+ was in the range of 3 × 10-6 mol/ L ~ 1.5 × 10-5 mol/ L