30 April 2012, Volume 43 Issue 08
    

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    研究与开发
  • Synthesis and Characterization of Ag-Doped TiO2 Nanotubes
    Jing-Ling LI;;Wei Lin;;;;
    . 2012, 43(08): 953-957.
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    Composite TiO2 nanotubes with Ag-doped were synthesized for the first time using the alkaline fusion and hydrothermal method under ambient atmosphere. Compared with the raw materials increased 2.3 times, the specific surface of TiO2 nanotubes was 82m2/g by nitrogen adsorption. The nanotubes were then characterized by XRD, TEM and XPS techniques. Research demonstrates that metal silver and silver oxide coexisted in the composite TiO2 nanotubes which were composed of Anatase and Rutile. Since the ratio of length to diameter rose, both height and intensity of the diffraction peak decreased significantly. UV-Vis Absorption spectrum of TiO2 nanotubes were shifted by 40nm for Ag-doped. This is because of the formation of Schottky on the surface of TiO2 nanotubes and formation of impurity level between TiO2 band gaps. Decrease in the apparent band gap contributed to the migration of photoelectrons, reducing the electron-hole recombination. The acidic active sites were increased by the hydroxyl(-OH) on the surface of TiO2 nanotubes, which enhanced the photo-oxidation of holes in the valence band.
  • Preparation and adsorption property of crosslinked chitosan microspheres under microwave irradiation
    Miao Zeng;Yan-An Zhang;Ming-Yan Dang
    . 2012, 43(08): 958-960.
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    With chitosan as the raw material, chitosan microspheres were prepared through crosslinked by formaldehyde and epichlorohydrin under microwave irradiation. The influence of synthesis conditions on adsorption capacity of chitosan microspheres was investigated. The microstructure and morphology of crosslinked chitosan microspheres was characterized with FT-IR and SEM. The results showed that dosage of crosslinking agent, stirring rate and treatment conditions with acid affect the properties of the resin largely. The resin had very good sphericity and the amino of chitosan could protected by schiff base. When synthesis conditions were as follows:stirring rate of 600r/min,dosage of formaldehyde1.5ml, dosage of epichlorohydrin 3ml, time treatment with acid 8min, dosage of hydrochloric acid 30ml, the adsorption capacity of chitosan microspheres on Cu(Ⅱ) could reach 269.83 mg/g.
  • Research on the stability and packaging technology of IPMC
    Bin Luo;;Zi-cai Zhu
    . 2012, 43(08): 961-964.
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    This paper first fabricated palladium type ionic polymer-metal composite material (Pd -IPMC), explored that the water content within in IPMC has a detrimental effect on the relaxation property,then IPMC is packaged by polydimethylsiloxane and polytetrafluoroethylene based on it . The IPMC is packaged by polydimethylsiloxane and polytetrafluoroethylene, which indicates a good stable performance without relaxation phenomenon and a quick response. The good performance of IPMC can be stable. The method by packaged with polydimethylsiloxane and polytetrafluoroethylene solved the difficult problem for the material are used for actuators and established the foundation for its application.
  • Three-dimensional Dynamic Character Analysis of FGM Plates with Complex Shapes
    Hong-Mei Cheng;Zhi-Yuan Cao
    . 2012, 43(08): 965-968.
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    In this paper, according to the micromechanics method, the three-dimensional dynamic characteristics of functionally graded material structures with different complex shapes by the material component determined in the process of the material production are analyzed, and the three-dimensional distributions along the thickness direction of the natural frequencies and the corresponding to displacement and stress modes are given. The result shows that there are great difference of natural frequencies and the corresponding mode shapes of the different functionally graded structures with the same material microcomponent distributions. The basis of quantitative data can be provided by these results for the specialized functionally graded plates and shells theory.
  • Formation and Growth Mechanism of La0.7Sr0.3FeO3 Nanowires by Hydrothermal Synthesis
    Peng-Jun Xiao;Jing Wang;Lin Zhao
    . 2012, 43(08): 969-972.
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  • Investigation of Ultraviolet laser etching of Ag film on Touch Screen
    Jian-Ke Di;Ming Zhou;Yu-xing Zhao
    . 2012, 43(08): 973-975.
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    Abstract: An investigation was conducted on ultraviolet laser beam etching of Ag film in the covered area of a touch screen. Advantages of Laser etching process were discussed by comparison with traditional printing process. Based on the described principle of laser etching, a UV laser system was designed and built for the purpose of the investigation, on which many experiments were performed. The results show that the 355 nm UV laser can efficiently etching out Ag films with one pass and with scanning speed of 1500 mm/s when laser power was 10W. A fully functional silver line pattern with a minimum line width of 10 μm was successfully obtained; the etched lines were straight with clean edge; there was a negligible heat-affected area and no damage of the substrate was observable. The investigation demonstrated that the UV laser beam etching of the silver film on the touch screen product can increase yield, raise quality and be environmental friendly.
  • Study on Electrochemical Behaviors of Dopamine via Amino-β-Cyclodextrin/G-raphene/Ferrocene Composite Film Modified Electrode
    Ya-Ni Mao;Shu-Juan Liu;Jian-Guo Ma
    . 2012, 43(08): 976-979.
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    Amino-β-cyclodextrin/graphene/ferrocene（β-CD-NH2/GNs/Fc）composite film modified glassy carbon electrode has been prepared using drop coated method. Then it was used to investigate the electrochemical behaviors of dopamine(DA). In pH=7.00 phosphate buffer solution (PBS), the results showed that good linear relationship between the concentration of DA and the oxidation peak current in the range of 0.1μmol/L-100μmol/L, the detection limit of samples was 8.5×10-8mol/L. Furthermore the modified electrode indicated high sensitivity and stability in determination, which can be further used to detect real samples.
  • Friction and Wear Behavior of Cu/Ti3SiC2/C Composites
    Xiao-Gen Zhao;Guo-Qiu He;Rui Zhang
    . 2012, 43(08): 980-983.
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    Titanium silicon carbide (Ti3SiC2) possesses a unique combination of properties of both metals and ceramics,for it is thermally shock resistant, thermally and electrically conductive, damage tolerant, lightweight, highly oxidation resistant, elastically stiff, and mechanically machinable. Cu/Ti3SiC2/C composites samples were formed by cold pressing at 300Mpa and by hot sintering in a hydrogen atmosphere. Cu/Ti3SiC2/C sample which contain 87% Cu was chose to finish friction-wear test because of its highest hardness and structuralhomogenity.The tests were conducted with a specially designed sliding apparatus and worn surfaces of the material were analyzed by optical microscope and SEM.The conclusion is that the wear loss without current-carrying demonstrate a linear growth process and wear mechanism is mainly abrasive wear and plowing wear;but the current-carrying wear loss demonstrate a nonlinear growth process and there are mainly abrasive wear and arc erosion wear.Wear rate have reduced because of dispersion-strengthening by impurity Al2O3. Wear mechanism is complex combination by abrasive wear,plowing wear,arc erosion wear and dispersion-strengthening.It also provides principle for designing suitable sliding counter parts for the current collection device.
  • The Preparation of CeO2 UV-shielding film by Sol-Gel process
    Ai-Hua Zhang;Mei-Li;Zhao-Gang Liu
    . 2012, 43(08): 988-991.
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    The paper studied the preparation of CeO2 ultraviolet absorber film by collosol method and gelatin method on the ordinary glass substrate. The different ratio layers of ultraviolet absorber film produced by intersect coating-method with TiO2 membranous layer as the cushion. By the experiment results, it is distinct that the transmissivity of ultraviolet rays and visible light by the different ratio layers, within a certain range, the absorption rate of ultraviolet rays increased with the addition of concentration CeO2 -collosol. Moreover, It is neglectful that the assembly time of collosolon affects the absorptivity of ultraviolet absorber film.
  • Specific Interaction in Collagen/Hydroxypropyl methylcellulose Blends Studied by Viscometry and Two-dimensional Infrared Correlation Spectroscopy
    Cui-Cui Ding;Hui-Lin Tian;Guo-Ying Li
    . 2012, 43(08): 992-995.
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    Viscosimetric method and two-dimensional infrared correlation spectroscopy were used to study the compatibility and interaction of collagen and hydroxypropyl methylcellulose (HPMC) blends in the present work. It was found that collagen/HPMC blends were compatible as HPMC content was below 30% by viscometric determination, while the blends were incompatible when HPMC content was above 50%. The synchronous negative cross-peaks between the stretching vibrations of C-O(H) of HPMC at 1061 cm-1 and amide bands of collagen derived from stretching vibrations of C=O at 1660 cm-1, wagging of N-H at 1553 cm-1 and in-plane deformation of N-H at 1238 cm-1, which were observed from two-dimensional infrared correlation spectroscopy, indicated that the O-H of HPMC interacted with collagen as HPMC content was less than 30%. However, as HPMC content was exceeded 30%, the intensity of negative cross-peak was decreased in synchronous correlation spectra while the intensity of cross-peak at 1061 cm-1 was enhanced significantly, indicating that the hydrogen bonding interaction between collagen and HPMC molecules became weaker; on the contrary, the hydrogen bonding formed amongst HPMC molecules tended to be enhanced.
  • The Phase-transfer Behavior of Amphiphilic Hyperbranched Poly(amide-ester) for Dyes
    Su-Juan Wang;Wen-Liang Li;Li-Bing Bai;Xin-Wu Ba
    . 2012, 43(08): 997-1000.
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    A novel amphiphilic polymer (HPAEB) was obtained by reaction between hyperbranched poly(amide-ester) (HPAE) and benzoyl chloride in the presence of Et3N. The as-prepared polymer consisted of HPAE as the hydrophiphilic core and the end benzoyl units as the hydrophobic shell. This polymer, which could form unimolecular micelles in dichloromethane at 0.125-0.5 g/L concentration, could successfully transfer MO from aqueous layer to organic layer. The encapsulation was a dynamic equilibrium process and 95% MO was transferred after 22 h. Note that the transferred MO could also be released from aqueous solution to organic layer. In addition, the double-dye transfer experiment confirmed that more MO could be transferred into dichloromethane solution in the presence of MB.
  • Adsorption thermodynamics and kinetics of Cd（Ⅱ） ions by modification of chitosan with vanillin
    Shao-dan Bi;Xiang-Yan An;Ming-Yan Dang
    . 2012, 43(08): 1001-1004.
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    Chitosan modified by vanillin(V-CTS) were prepared with microwave radiation method for adsorption of Cd（Ⅱ）ions were investigated. V-CTS was characterized by means of FTIR，SEM and XRD. Results showed that the isothermal adsorption follows the isothermal adsorption model of Freundlich. Enthalpy change at adsorption temperatures in range of 298-318K is 24.2174 kJ/mol,, which suggests that adsorption process is endothermic. The adsorption kinetics followed the mechanism of the pseudo－second－order equation and activity energy is 25.57597 KJ/moL, evidencing chemical sorption as the rate-limiting step of adsorption mechanism and not involving a mass transfer in solution. After 4 times regeneration experiment,the uptake amount of Cd（Ⅱ）ions reduced 18.9%.
  • Preparation and characterization of telluride nanoparticles
    Peng-Xu Wu
    . 2012, 43(08): 1005-1007.
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    Telluride nanoparticles were prepared by inert-gas condensation. The crystal structure, morphologies and particle size distribution of the sample were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and laser particle analyzer. The results indicate that the prepared nanoparticles of four kinds have uniform size, high purity, narrow size distribution and spherical shape. As the working pressure is from 30kpa to 5kpa at constant electric current of 50A, the average diameters of the nanoparticles of Te and Bi decrease from 200nm to 20~80nm.
  • Synthesis and characterization of a novel shape memory poly(urethane-urea) by using piperazine as a chain extender
    Xiao-Yan ZHANG;Yan-Feng Luo;Chang-Shun Ruan
    . 2012, 43(08): 1008-1011.
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    Piperazine (PPZ) was used a chain extender to synthesize a series of novel poly(urethane-urea) (PUU) with poly(lactide-co-p-dioxanone) macrodiol (HO-P(LA-co-PDO)-OH) as a soft segment and hexamethylene diisocyanate (HDI) as a coupling agent. PPZ, as a cyclic secondary diamine is expected to reduce or even eliminate the crosslinking during the synthesis of PUU which is often happened when those primary diamines are used as chain extenders. Moreover, the cyclic structure of PPZ may be helpful to enhance the rigidity of the hard segments in the PUU. NMR was employed to verify the chemical structures of the PUU copolymers. The phenomenological observations on the reaction mixture and the solubility and melting state of the produced PUU confirmed that PPZ may significantly reduce the crosslinking compared to butanediamine (BDA) as a chain extender. Finally, the effects of the hard segment contents characterized by NCO/OH molar ratios on the Tg values of PUU were investigated by means of differential scanning calorimetry (DSC), and the results revealed that Tg values can be controlled from 37.32 oC to 43.50 oC by increasing the NCO/OH ratios from1.1 to 1.5 and the cyclic structure of PPZ increases the rigidity of the hard segments and thereby the Tg values. PUU had good shape memory properties:shape recovery ratio was more than 95% .
  • Study on in situ CuYSi particle reinforced bulk Mg-based amorphous alloy matrix composites
    Yang Shao;Gang Chen;Yu-Tao Zhao
    . 2012, 43(08): 1012-1015.
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    By traditional copper casting method, a kind of in situ particle reinforced bulk Mg60Cu30Y10 amorphous alloy matrix composite was prepared from Mg-Si(4%) alloy, pure Cu, pure Mg and Cu-Y(38%) alloy. Particles in the amorphous alloy matrix composite were determined as CuYSi by XRD and EDS. The morphology, size and composition of the particles were analysised by SEM-EDS. Thermal stability of the bulk Mg60Cu30Y10 amorphous alloy matrix composite were studied. The results show that the in situ synthesized crystalline CuYSi particles with small size uniformly distribute in the amorphous alloy matrix composite. Compared with pure Mg60Cu30Y10 amorphous alloy, the △Tx of the composite increased 6.1K.
  • Synthesis of Fe nanoparticles by chemical reduction：Structural and magnetic characterization
    jun hejing An;Yanghuan Zhang;
    . 2012, 43(08): 1016-1019.
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    Fe nanoparticles were prepared by reduction of FeCl2 by NaBH4 at room temperature. During the reaction, Polyacrylic acid (PAA) was added to the reagent as the surfactant. The nanoparticle size was shaped with the range of 3~5nm at the condition of PH=6. The nanoparticles were then annealed at different temperature in Ar. The influences of annealing temperature on the structure and magnetic properties of Fe nanoparticles were studied. As a result，the Fe nanoparticles which prepared by chemical reduction method are almost amorphous, and their magnetism is mix of superparamagnetic and ferromagnetic. Crystalline degree of Fe nanoparticles are improved as the annealing temperature increase, and the magnetism of Fe nanoparticles is gradually transformation from mix magnetic to the ferromagnetic.
  • Mossbauer Spectra and Magnetic Properties Study of CoFe2O4 Nanoparticles prepared by hydrothermal method
    Xiong Lin;Hong-Yan Duan;Jun Wang
    . 2012, 43(08): 1020-1023.
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    Abstract: Good crystallinity and uniform CoFe2O4 nanoparticles were synthesized by hydrothermal method at different synthesis temperature without further calcination. The synthesized samples at different temperature were studied by XRD, SEM, Mossbauer spectra and PPMS. The results show that as the synthesis temperature increases, the crystallinity，size and the saturation magnetization of the CoFe2O4 crystalline nanoparticles gradually increase. When the synthesis temperature reach 500℃, the saturation magnetization of the CoFe2O4 nanoparticles reach 64.1 emu/g, close to the bulk CoFe2O4(72 emu/g).The results of M?ssbauer spectrum indicate that when the grain size is greater than the size of the critical size of superparamagnetic, the superparamagnetism of the samples disappear. The proportion of Fe3+ ion in B-site and the magnetic properties increase with synthesis temperature.
  • Preparation and Photocatalytic Performance for Hydrogen Evolution of Vermiculate SiC
    Jian-Ying Hao;Xian-Jun Li;Ying-Yong Wang
    . 2012, 43(08): 1024-1026.
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    Vermiculate silicon carbide (SiC) was prepared by carbothermal reduction method, in which phenolic resin and low-cost water glass were respectively employed as carbon and silica precursors. The as-synthesized SiC was characterized by XRD, BET, SEM, TEM and UV-Vis diffusion reflectance. The photocatalytic activity for water splitting was investigated under visible light irradiation. The results show that the vermiculate SiC has a strong absorption in the visible region and exhibits highly stable and efficient photocatalytic hydrogen evolution from pure water under visible light irradiation. The average hydrogen production rate is up to 88μL/g?h after 10 h irradiation.
  • Effect of surface structure on degassing performance using PVDF hollow fiber membrane
    Pei-li GUO;;;;Yue JIA;;
    . 2012, 43(08): 1027-1030.
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    Deoxidizing performance of polyvinylidene fluoride (PVDF) hollow fiber membrane with different microporous structure was studied in this paper. The PVDF membranes have been fabricated using four different internal coagulants including water, 60% DMAc, 70% DMAc, and 75% DMAc solutions which have a significant impact on surface morphology under the same spinning condition. The membrane surface morphology was identified by scanning electron microscopy (SEM) and the pore size, permeability coefficient and mechanics performance of membrane were also tested. Results showed that a bigger surface roughness on the membrane could be obtained using 75% DMAc in internal coagulants. Gas permeation tests demonstrated that PVDF membrane with a bigger surface roughness had a higher permeability coefficient. This kind of PVDF hollow fiber membrane turned out to have a higher overall mass transfer coefficient and deoxidizing efficiency.
  • Sintering and processing nanocomposite powder of Mo-8wt%Cu
    Bao-Quan Hu;Bei-Kang Bai;Yan-Zhong Wang
    . 2012, 43(08): 1031-1033.
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    Abstract: Mo-8wt%Cu nano powders were fabricated by mechanical alloying, and the dense alloys are obtained via the liquid-phase sintering and post-treatment process. The micsrostructure of Mo-8wt%Cu alloy were investigated by Scanning electron microscope (SEM), and the effects of process parameters on the density, tensile strength， the elongation and grain size were studied. The results indicate that the relative density of alloy is 98.6% after sintering at 1250 for 30 min, and its microstructure is composite network. The full density of Mo-Cu alloy is achieved when specimens are treated through hydrostatic Extrusion transformation processes.The tensile strength is 576MPa, and the elongation is 5.8% when hydrostatic Extrusion transformation degree is 40%.
  • Synthesis and control of Fe3O4 magnetic nanoparticles
    Hai-cheng Wang;
    . 2012, 43(08): 1034-1037.
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    The fcc structured Fe3O4 nanoparticles are prepared using hydrolysis coprecipitation in this paper. The effect of temperature and pH on the grain size and shape of the Fe3O4 magnetic nanoparticles are discussed. The results show that, reaction temperature affects the size of Fe3O4 nanoparticles. As the temperature rising from 30℃ to 90℃, the grain size increases from 6-8nm to 10-12nm and the saturation magnetic moment also increases. Meanwhile, the shape of Fe3O4 nanoparticles varies according to the pH of the solution. High pH leads to cubic particles while low pH causes spherical shape. The controllable size and shape of Fe3O4 nanoparticles laid a good foundation for further synthesis, regulation of electro-magnetic functional Fe3O4 composites.
  • Preparation and antibacterial properties of chitosan modified silver nanoparticles
    Min-Jie Gao;Zhi-Qiang Wang;Lei-Sun
    . 2012, 43(08): 1038-1041.
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    Chitosan modified silver nanoparticles (chitosan–Ag NPs) were synthesized through liquid phase reduction with sodium borohydride (NaBH4) as the reductant and chitosan as the surface modification agent, respectively. The structure and morphology of the as-prepared nanoparticles were investigated by X-ray powder diffraction, transmission electron microscopy, and Fourier transform infrared spectrometry. The results show that the as-synthesized chitosan modified Ag nanoparticles have a face-centered cubic crystalline structure. The surface of Ag nanoparticles is coated by chitosan with the chemical bonds between amino, hydroxyl groups and Ag ions. The antibacterial properties of chitosan–Ag NPs against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were investigated by broth dilution. The results show the as-synthesized chitosan–Ag NPs exhibit good antibacterial properties against E. coli and S. aureus. The grain sizes of nanoparticles have a remarkable effect on the antibacterial properties.
  • Properties test of Air Purification Coating for Spacecraft
    Lei Wang;Hong Jia;Chong-Fang Ma
    . 2012, 43(08): 1042-1044.
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    The white nano-titania coating are prepared by sol-gel method. The particle size of nano-titania is range between 10～20nm by the analysis of XRD and TEM. In order to testify the fact that the TiO2 coating can be used to purify air within spacecraft sealed-cabin, the nano-titania coating photocatalytic oxidation experiments are carried out. The experimental results indicate that nano-titania coating can degrade the air contaminants such as formaldehyde, sulfur dioxide and nitrogen dioxide, at the same time, which can kill the bacteria and virus such as Escherichia coli and Klebsiella pneumoniae.
  • Preparation and Bio-functionalization of Magnetic-fluorescent Nanocomposites
    Ya-Ru Li;Xue-Lian Zhang;Yuan-Yuan Pan
    . 2012, 43(08): 1045-1048.
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    Fe3O4 nanoparticles were prepared by the chemical coprecipitation method. Nanoparticles with properties of magnetism and ?uorescence were prepared by entrapping Fluorescein isothiocyanate (FITC) into the silica shell of Fe3O4. Nanocomposites were obtained by conjugating bovine serum albumin (BSA) with magnetic-fluorescent nanoparticles. Products were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectra (FT-IR), photoluminescence spectra (PL), and X-ray photoelectron spectroscopy (XPS). The results indicate that nanocomposites retain both fluorescence characteristics and magnetic responsibility, and are grafted BSA successfully. The bio-functionalized magnetic-fluorescent nanocomposites are expected to be widely used in the ?elds of cell labelling, luminescence tracking, magnetic separation and so on.
  • Fabrication and drag reduction property of polymer coating with micron-scale structured surface
    Bei-Bei Feng;Yan ZHANG;
    . 2012, 43(08): 1049-1051.
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    A kind of polymer coating with micron-scale structures was prepared using air spray painting technique. A surface mapping microscope was utilized to study the surface of the polymer coating. The formation mechanism of the structured surface was given according to the x-ray spectroscopy analysis. Test results in a water tunnel showed remarkable drag reduction rate on the polymer coating. The drag reduction mechanism was discussed.
  • Effect of rosin addition on preparation of mesocarbon microbeads
    Zhi-Chao Ma;Qi-Lang Lin;Qiu-Hong Cai
    . 2012, 43(08): 1052-1055.
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    Mesocarbon microbeads (MCMB) were prepared by thermal polymerization of medium-temperature coal tar pitch with rosin as additive. The MCMB were charaterized by FT-IR, SEM and particle size analyzer, and effect of rosin addition on the preparation of MCMB was investigated in this paper. Results show that rosin can be used to efficiently control the thermal polymerization of coal tar pitch, as indicated by that the rosin addition is benificial for promoting the nucleation and growth of MCMB as well as for inhibiting the coalescence of MCMB. The MCMB, which possess fine sphericity and well dispersity, can be achieved by pyrolysis of the modified pitch with 10wt% rosin at 450°C for 2h. The MCMB obtained have a mean diameter of 15.3 μm, and the yield of MCMB arrives at 44.1%.
  • Preparation of Super-hydrophobic Polyvinylidene fluoride Separation Membrane
    Xian-Rong WANG;;Jia-Ming LIU;;;;Yue JIA;
    . 2012, 43(08): 1056-1060.
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    We modified the surface of polyvinylidene fluride (PVDF) hollow fiber membranes by non-solvent induced phase separation and then obtained super-hydrophobic separation membranes. In this paper we researched the influences of PVDF percentage composition in the coating solution and coating conditiongs (such as: soaking time, pre-evaporation time, coagulation bath composition and coagulation bath temperature). The results showed that: Composite membranes had the largest contact angle that was 136 °when PVDF solid content was 1.88wt% in the coating solution; withing the extension of soaking time, the contact angle of composite membrane at first increased and then decreased, when the soaking time was 40s, the contact angle reached to a maximum of 133 °; in a relatively short period of time (0-5s), the pre-evaporation time had little effect on the contact angle of composite membrane; contact angle of composite membrane decreased with DMAc concentration in the coagulation bath increased, but increased with the coagulation bath temperature increased, when the coagulation bath temperature was 65 ℃, the membrane surface contact angle increased to 153 °.
  • High temperature thermoelectric performance of Ce doped Ca3Co4O9
    Hong-Yu Zhu;Hong-Tao Li;Chun-Yuan He
    . 2012, 43(08): 1061-1063.
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    Thermoelectric materials Ca3Co4O9 doped with Ce in the composition of CexCa3-xCo4O9 （x=0，0.1，0.3）were prepared by solid state reaction. The phase structures and microstructures of the oxides were investigated and the Seebeck coefficient, electrical conductivity and thermal conductivity were measured from room temperature to 973 K. It was found that the electrical resistivity and thermal conductivity decrease with an increase of temperature. While the Seebeck coefficient increases with an increase of temperature. The maximum figure of merit 0.23 is obtained for the Ce0.1Ca2.9Co4O9 at 973K.
  • Preparation of Phenolic Resin/ Styrene-acrylate Surfactant-free Latex and its Effect on Paper Strength
    Xuan Li;Yi-Ding Shen;Gui-Qiang Fei
    . 2012, 43(08): 1064-1067.
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    With polyvinyl alcohol (PVA) as polymeric colloid stabilizer, a kind of surfactant-free copolystyrene-acrylat latex with good stable and excellent property was successfully synthesized by reacting N-hydroxymethyl Acrylamide (NMA), styrene (St) and butyl acrylate (BA). A kind of phenolic resin/ styrene-acrylate surfactant-free Latex was synthesized by styrene-acrylate latex and thermosetting phenolic resin. The factors affecting its synthetic condition were discussed, and the synthetic process was optimized. The results show that the compound emulsion owns excellent sizing property when w(PVA)=12%，w(NMA) =10%, n(BA)/n(St)=1.0 and m(PR)/m(styrene-acrylate)= 2.0. The papers’ sizing value can reach 32s, ring crush index reach 8.4N/m/g with 1.0% compound emulsion addition. The matching of polymer emulsion with starch is favorable, and is endowed with excellent sizing performance. When m(compound emulsion)/m(starch solution)= 0.3, the papers’ sizing value can reach 40s, ring crush index reach 8.9N/m/g. Finally, the polymer was characterized with TEM and SEM.
  • Microstructure and high temperature oxidation resistance research on air nozzle alloy of circulating fluidized bed boilers
    Yan-Bing Dai;Bi-Long You;Shao-Guang Liu
    . 2012, 43(08): 1068-1071.
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    According to the severe high-temperature oxidation problem of CFB boiler air nozzles, a new superalloy AN1 (Cr23Ni32MoNb) for air nozzles had been developed. The microstructure and high temperature oxidation properties of AN1 Alloy had been studied and compared with those of steel 25-20 and steel 316 by using optical microscope, Vicker-Hardness measurements, X-ray refraction observation, scanning electron microscope and energy dispersion spectrum analysis. The results showed that the as-cast microstructure of AN1 alloy exhibited a typical dendritic structure composed of austenite matrix and intercellular carbides such as Cr23C6 and NbC, and the dendrite disappeared after being solid-solution treatment. After being exposed to 1000℃ for 100h, the high-temperature oxidation resistance of AN1 alloy was found respectively to be 2.2 and 3.8 times that of steel 25-20 and steel 316, and the surface phase structures of AN1 alloy consisted of γ,Cr2O3 and composite oxide Cr-Mn.
  • Preparation and performance study of new perfluorosulfonated acid ion exchange membranes for vanadium redox flow battery
    Shu-Juan Liu;Lei Li;Yong-Ming Zhang
    . 2012, 43(08): 1072-1075.
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    Perfluorosulfonated acid (PFSA) ion exchange membranes, with different ion exchange capacities (IECs), were prepared by a solution-casting method for vanadium redox flow battery applications. Water uptake, proton conductivity, vanadium ion permeability and selectivity of the PFSA ion exchange membranes were investigated. It is found that membranes with higher IEC values have relatively lower vanadium ion permeability and higher proton conductivity. The highest selectivity of the membranes being characterized was achieved from the PSFA ion exchange membrane with 1.10 mmol/g, which was 2.97 times higher than that of Nafion 117 membrane.
  • Study on preparation and mechanical properties of in-situ ZrB2p/Al composite
    Yong Zhang;Gang Chen;Yu-Tao Zhao
    . 2012, 43(08): 1076-1078.
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    With high intensity ultrasonic treatment, a ZrB2 particle reinforced aluminum matrix composite was successfully fabricated by using the direct melt reaction method. The phase content and microstructure of composite were analyzed by using X-ray dif-fractometer(XRD) and scanning electron microscopy(SEM). It is found that the size of ZrB2 particles in composite has become smaller and the distribution has been improved after high intensity ultrasonic treatment. The tensile strength, yield strength and the elongation of the composites reach to 94MPa, 81MPa and 14.5%, which are 10.6%, 15.7% and 16.0% higher than those without ultrasonic assistance respectively.
  • SMARC bellows type rigging the driving characteristics research and neural network modeling
    Chun-Hua Zhou;Bang-Feng Wang
    . 2012, 43(08): 1079-1083.
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    In the research of variant skinned wing, a type of SMARC rippled skin structure with active deformation was proposed at first for meeting requirements of continuous smooth and large deformation. And then, two kinds of skin testing samples were made and tested for stretch and driving ability in different environment temperature. Results of tensile test show that SMARC rippled skin test sample has better stretching deformation performance than the ordinary rippled skin type. However, the temperature has more influence on SMARC rippled skin test samples. When the temperature is higher, structure stiffness of SMARC rippled skin test sample is smaller. In the driving test, the initial displacement of SMARC rippled skin test sample has linear increase. When the drive electric current is more than 3.4A, matrices of composite material are heated to soften. As the result of that, the displacement has a nonlinear variation trend. At last, on the basis of driving test data, a type of RBF neural network model was established where current strength was input parameter and the driver displacement was output parameter. The approximation curve of this neural network model is more accurate and close to the practical characteristics, and the biggest driver relative prediction error is less than 6%, which provides for active control of intelligent skin with a certain theoretical and experimental basis.
  • Hybrid coatings with tetraethoxysilane as the inorganic network precursor on polycarbonate for improvement of abrasion resistance
    Yu-hong CHEN;Li-Xiang Liu;Mao-Sheng Zhan
    . 2012, 43(08): 1084-1088.
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    The hybrid coatings were synthesized through the sol–gel process using MTMS as organic phase, tetraethoxysilane (TEOS) as the inorganic network precursor and deposited on polycarbonate for improvement of abrasion resistance. Fourier transform infrared (FTIR) spectra showed that the cross linked network structure of Si-O-Si formed due to the hydrolysis–condensation reactions of alkoxy groups in the MTMS/ TEOS sol. The influence of the mole ratios of MTMS and TEOS on the optical properties, pencil hardness, adhesion properties and the abrasion resistance of the coatings were investigated. The result indicated that the MTMS/ TEOS coating possessed the best properties when the original molar ratio of MTMS and TEOS was 2:1. After 500 wear cycles during an abrasion test, the haze of PC coated with the hybrid coating derived from the optimized component was only 12.69 %, while that of uncoated PC rose up to 42.38%. Scanning electron microscope (SEM) and Transmission electron microscope (TEM) were used to determine the microstructure of the MTMS/ TEOS coating and the micrographs revealed the homogeneous dispersion of nanosilica particles in the polymeric matrix.
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