15 August 2012, Volume 43 Issue 15
    

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  • YU Fei;ZHOU Lu;YANG Mingxuan
    . 2012, 43(15): 1969-1975.
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    In this paper, we reviewed the main fabrication approaches of transparent conducting film of carbon nanotubes (CNTs-TCF) and their advantages and disadvantages. We summarized the influencing factors of the optoelectronic performance on the CNTs-TCF, such as: the fabrication method, metallic or semiconducting, purity, graphitization and the fabrication process of well-dispersive solutions of the carbon nanotubes. The corresponding improvement methods were also mentioned. The brief descriptions of the application of CNTs-TCF in touch panels, solar cells and liquid crystal displays, were introduced in the paper. At the last, we have prospected the future research of CNTs-TCF.
  • GENG Cunzhen;XIA Yanzhi;QUAN Fengyu
    . 2012, 43(15): 1976-1980.
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    Cellulose is the inexhaustible and renewable resource in nature. If its structure is changed, it will be many new functions. Selective oxidation cellulose has become the hot spot in the field of cellulose science and new materials based cellulose. This paper reviewed all kinds of the selective oxidation systems of cellulose. Especially it focused on the TEMPO/NaClO/NaBr selective oxidation system of the reaction conditions, reaction mechanism and the latest research progress. At the end of the paper, the application of oxidized cellulose and development prospect was analyzed.
  • 研究与开发
  • YANG Rendang;CHEN Guowei;LIAO Xushen
    . 2012, 43(15): 1981-1984.
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    olymethyl methacrylate(PMMA)-CaCO3 powdery coating was made in the method of supercritical fluid and used in the dry surface treatment of paper. In order to solve the problems of combination and dispersion with PMMA, nano-calcium carbonate particles well dispersed in ethanol was modified by silane coupling agent KH-570. The effects of the reaction temperature and amount of modified calcium carbonate on the polymerization of MMA were discussed,The modified CaCO3 was characterized by FT-IR and TGA, and the powdery coating particles were systematically investigated by GPC, TGA and SEM methods. The experimental results indicated that the particle size of PMMA is smaller,which can be used to dry surface treatment of paper coating. From SEM observation,it was found that the modified calcium granules carbonate were able to evenly disperse and embedded in the PMMA and didn’t show conglomeration. Moreover, the interfacial bonds and dispersion situation of water-free powdery coating particles were fairly well.
  • HU Dawei;WANG Yanmin;PAN Zhidong
    . 2012, 43(15): 1985-1988.
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    This paper selected nano-particles of Fe3O4 with irregular, octahedron and six-party flake morphologies as solid phase material used in magnetic fluids. A test device for the magnetic fluid transmission was designed. The relationships among the transmission torque and the disk space, rotation difference and particle morphology of the as prepared magnetic fluids were investigated. The results show that the transfer torque is correlated to the magnetic induction in a certain gap between the drive plates when the magnetization of magnetic particles does not reach a saturation value. The transmission torque increased with increasing the magnetic induction. However, the magnetic particles gradually reached the saturation magnetization when the magnetic induction was further increased, leading to a constant transmission torque. The gap between the drive disks had an impact on the transmission torque. A greater gap could give a smaller transmission torque. The rotation difference between the transmission disks had a slight effect on the transmission torque at a lower rotation. The transmission torque increased with increasing the rotation difference. However, the transferred torque would decrease when the rotation difference exceeded a certain limit due to the shear-thinning effect of the magnetic fluid. The morphology of the magnetic particles in the magnetic fluid could affect the transfer torque. The nano-particles of Fe3O4 with octahedral morphology could transfer a greater torque rather than the nano-particles with irregular or six-party flake-like morphologies.
  • LIU Shaoying;ZHAO Zhitong;YAN Yonggang
    . 2012, 43(15): 1989-1993.
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    Abstract: A novel biodegradable polyamide was prepared by in ring opening melting polymerization based on 6-aminocaproic acid and α-pyrrolidone, then N6P30(when the molar ratio of 6-aminocaproic acid and α-pyrrolidone is 7:3) and its composite material with calcium sulfate (CS/N6P30) was synthesized. They were characterized by infrared spectrometer (IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and differential scanning calorimeter (DSC). Its properties of the viscosity of polymer were investigated by means of ubbelohde viscometer;the mechanical properties were characterized by compressive strength; and the in vitro degradability of the composite was determined in phosphate buffered saline (PBS). The results indicated that the polymer is a kind of polyamide,the reaction become more and more difficult with increasing of the proportion of α-pyrrolidone, it has both good mechanical property and the greatest degree of introduction of α-pyrrolidone when the molar ratio of 6-aminocaproic acid and α-pyrrolidone is 7:3. PBS experiment indicated that CS/N6P30 is more degradable than N6P30; Degradability of composite materials enhanced with increasing calcium sulfate amount; the pH of soaking medium maintained in the range of 6.6 -7.4 during the immersion period. Composite material not only has the good mechanical properties as that of N6P30, but also the biocompatibility as that of CS ,so this composite can be potentially used as bone repair materials.
  • YANG Fazhan;SHEN Liru;GAO Hui
    . 2012, 43(15): 1994-1997.
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    The thick diamond-like carbon(DLC) films were deposited on 316 stainless steel by pulsed glow discharge plasma vapor deposition(PGDVD)and cathodic arc discharge method(CAD). The composition ,microstructure and mechanical property of the films were investigated by Raman spectroscopy, X-ray photoelectron spectroscopy(XPS) ,optical microscope,microscopic hardness meter and friction wear testing machine。It was found that the DLC films were improved owing to the compact structure and smooth surface. The G peak and D peak show a move to a higher wave,the I(D)/I(G) and I(T)/I(G) intensity rate are 0.72 and 0.22, respectively. FTIR analysis shows that the film contains more CHx key component of SP3;The friction coefficient reached 0.100 and the sp3 content is 60.7% and the thickness is 7 micrometer in film. The mechanical hardness and the frictional surfaces trail of the DLC film were also measured.
  • YANG Lunquan;ZHANG Zhengfu;XU Mingli
    . 2012, 43(15): 1998-2001.
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    For the first time, PtIr/C alloying catalysts were synthesized by high-pressure hydrogen reduction method using H2IrCl6·6H2O and H2PtCl6·6H2O as Ir and Pt precursors, PVP as dispersing agent, in ethylene glycol solution, then further heat treated at different temperatures in H2 gas. The PtIr/C alloying catalysts were characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy. The results revealed that the PtIr nanoparticles were alloying catalysts, the metal particles were good dispersed on the caubon surface. After heat treated at 400℃ and 700℃, the mean particle sizes of PtIr nanoparticles just increased from 4.46nm to 4.56nm and 5.58nm, and with the increasing at heat treatment temperature, the crystal structure of PtIr alloying nanoparticles improved. CO-stripping voltammetry, cyclic voltammetry(CV) and Chronoamperometry(CA) were used to characterize the catalytic performance of PtIr/C alloying catalysts toward CO and methanol electro-oxidation. PtIr/C catalysts had a lower oxidation starting potential towards CO oxidation in acid solution and a better catalytic activity towards methanol oxidation.
  • FENG Lajun;GUO Meijuan;FENG Hui
    . 2012, 43(15): 2002-2005.
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    Cotton texture used as towel and clothing exhibits good hydroscopicity and flexible. However, cotton texture is favor to be the location of microorganism propagation, further affects more and more people. Therefore, AgO/TiO2 composite powders were synthesized by mechanical mixing in this paper. The size distribution of AgO/TiO2 composite powders was analyzed by laser particle sizer. After that, antimicrobial cotton texture with AgO/TiO2 was manufactured by hereafter disposal. The phase composition of the treated cotton texture was analyzed by X-ray diffraction, and the antibacterial effect was tested. The results show that the size of AgO/TiO2 composite powders was fine, and the specific surface area was high, which was distributed in the range of 0.286-11.740μm, and was 442.37m2/kg, respectively. After finishing with AgO/TiO2 composite powders, there were particles attached to cotton texture, which existed in the form of AgO. The treated cotton texture possessed strong antibacterial effect and good washing resistance. Its inhibition zone width against E. coli and bactericidal rate were 1.075cm and 100%. After 20 times washing, its inhibition zone width and bactericidal rate were 0.780cm and 99.98%, respectively.
  • LIN Zhitao;ZHU Bo;LIN Xue
    . 2012, 43(15): 2006-2008.
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    In the production of PAN precursor for carbon fiber,PAN fiber was prepared by finishing different oil agent before collapsing and being treated in different time during collapsing. The surface morphologies,crystalline structure,fiber fineness,tensile strength,elongation at break and bulk density of PAN fiber were studied by SEM,XRD,fiber fineness instrument and fiber strength and elongation instrument. The results show that oil agent can effectively prevent deformation,adhesion,cohering and surface defect of the fiber .With the increase of collapse time,Lattice spacing,crystalline size and elongation at break are decreased,but crystallinity,tensile strength and bulk density are increased,and fiber fineness is unchanged. By using different oil agent and concentration,the properties of PAN fiber are different.
  • LIU Yuejun;GAO Xin;LIU YiWU
    . 2012, 43(15): 2009-2013.
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    MgAl-CO3 double hydroxide(LDHs), MgAlZn-CO3 LDHs and MgAlZnFe-CO3 LDHs inorganic nano-powders were prepared by coprecipitation and were in-situ modified with PEG.. Nano-composites were prepared along with EVA through melt blending and then were injection molded into samples. The mechanical properties and combustibility of the nano-composites were studied and XRD、TG analyses were carried out. The results show that: though the mechanical properties of the composites deteriorated to some degree, the flame resistance of the composites improved remarkably with the addition of LDHs powders. Meanwhile the falme resistance improved with more elements in the LDHs. The composites can self-extinguish when 15 % MgAlZnFe-CO3 LDHs were added.
  • SONG Yanyang;YUAN Siguo;ZHOU Congzhang
    . 2012, 43(15): 2014-2017.
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    The adsorption performance of carboxylic acid ion exchange fiber for Ni2+ in the plating wastewater was studied. The results showed that the adsorption capacity of sodium carboxylic type fiber was much higher than one of the free carboxyl type fiber under the same conditions, and the adsorption capacity of sodium type fiber for Ni2+ could be up to 220 mg/g. The larger the initial concentration, pH value and temperature of containing nickel solution were, the adsorption capacity of the functional fiber was higher. The C Ni2+of filtrate was lower than 0.5mg/L in the column adsorption process when C initial Ni 2+were from 100 mg/ L to 300 mg/ L. The fiber adsorbed Ni2+ could be desorbed by aq. HCl (2mol/ L) , and the adsorption performance of the fiber did not significantly decline after 100 adsorption-desorption cycles.
  • XIE Ben;ZHU Bo;WANG Zheng
    . 2012, 43(15): 2018-2021.
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    Polyacrylonitrile (PAN) nacent fibers fabricated by solution spinning were thermostatically dried for different time in order to improve their tensile property. Tensile test was performed to obtain the relationship between the tensile property and the drying time, which showed an optimum break force at 10.3cN and breaking elongation at 263.5%. Fiber dried for 10h was most appropriate for drawing as it possessed both high breaking elongation and low yield platform. Accelerating drawing speed availably promoted the tensile property for un-dried PAN nascent fiber, which only had a small effect on dried fiber. And then the fracture morphology of the fibers was characterized with SEM, the results of which demonstrated that increasing drawing ratio was able to help promote compactness of fiber.
  • PENG Lan;WEN Jinxiong;LI Yourong
    . 2012, 43(15): 2022-2026.
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    In order to understand the effect of gap width and crucible radius on the characteristics of heat transfer and melt flow for the CdZnTe crystal growth, a set of global analyses for detached solidification was carried out using the finite-element method under the gravity condition. The simulation results show that the characteristics of heat transfer and melt flow pattern are strongly dependent on the gap width and crucible radius: (1)The gap width plays a decisive role in detached solidification. When the gap width is narrow, the temperature difference on two ends of meniscus is very small, which leads to increase the risk of crystal to reattach crucible wall. Along with the increasing gap width, the instability of melt flow intensifies, which consequently increases the difficult of keeping the stable of meniscus shape and crystal growth. (2) With the increase of crucible radius, the effect of Marangoni convention in the melt flow is gradually strengthened as well as the instability of melt flow nearby the solid-melt interface intensifies, which is adverse to the stable crystal growth.
  • SUN Jie;ZHAO Donglin;LIU Hui
    . 2012, 43(15): 2027-2030.
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    Carbon encapsulated hollow Fe3O4 nanoparticles have been successfully synthesized via co-carbonization and oxidation in the air. The morphologies and structural features of the sample were investigated by X-ray diffraction(XRD)、transmission electron microscope (TEM) and high-resolution TEM (HRTEM). The electrochemical performance testing showed that the first reversible specific capacity of the carbon encapsulated hollow Fe3O4 nanoparticles was as high as 1294.7mAh/g at a current density of 0.2 mA cm?2. After 30 cycles the reversible specific capacity was still maintained at 392.1 mAh/g. Even at a high current density of 1mA cm?2, the first reversible specific capacity was 216.3mAh/g and remained at 113mAh/g after 30 cycles.
  • LI Changfa;LI YI;LIU Xuequan
    . 2012, 43(15): 2031-2034.
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    This work focuses on the effect of phosphating process on the magnetic and electrical properties of Fe-based soft magnetic composites(SMC). X-ray diffraction pattern, scanning electron microscopy, energy dispersive spectrometer analysis and distribution maps show that the phosphate iron particles surface layer contains a thin layer of nanocrystalline or amorphous phosphate with high coverage of powders surface. Magnetic measurements show that the phosphated iron samples has excellent comprehensive electromagnetic properties. The phosphating process is carried out by stirring the iron powders in the solution with 0.01g?ml-1 phosphoric acid concentration at room temperature for 30min. With increase in the phosphoric acid concentration, phosphating time or temperature, specific resistivity increases, magnetic loss decreases significantly at medium and high frequencies and permeability also decreases by some extent.
  • DU Jie;WANG Shengjiang;WU Yongzhong
    . 2012, 43(15): 2035-2039.
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    GSH-stabilized high-luminescent CdTe quantum dots (QDs) were prepared using Na2TeO3 as the Te source by microwave irradiation in aqueous phase has been presented in this paper. The emission peak of CdTe QDs ranges from 515nm to 630nm and the high quantum yield reaches as high as 95%. The obtained CdTe QDs were characterized by X-ray diffraction pattern (XRD), high resolution transmission electron microscopy (HRTEM), UV-vis absorption and photoluminescence (PL) spectra. The two-photon absorption property of GSH-CdTe QDs was investigated using the two-photon excitation fluorescence measurement. In addition, human lung carcinoma cells (A549) were labeled using red-emitting GSH-CdTe QDs as a fluorescence probe by two-photon fluorescence imaging technique.
  • JIANG Feng;SHEN Honglie;JIN Jiale
    . 2012, 43(15): 2040-2044.
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    Cu2ZnSnS4 (CZTS) film was prepared by sulfurization of Zn/Sn/Cu multilayer. CZTS film’s characterization was carried out by X-ray diffraction、Raman spectrum、UV-Vi-Nir spectrophotometer、Scan electron microscope、Energy dispersive spectroscopy and Digital source meter. The results show that no any other phases were observed and the Raman peaks observed are in accord with the standard Raman perks of kesterite CZTS. The light absorption coefficient of the film is higher than 104cm-1 and its optical band gap was estimated to be about 1.5eV. The surface of CZTS film is compact and uniform and the element ratio is close to the stoichiometric value. Obvious photo current response property of film was observed, and the photo current excitation time and decay time are 0.0736s and 0.2646s, respectively.
  • KE Huizhen;ZHANG Huidan;LI Dawei
    . 2012, 43(15): 2045-2048.
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    Form-stable phase change fibers based on binary fatty acid eutectic/PET composites in which the five binary fatty acid eutectics serve as solid-liquid phase change material and PET acts as a supporting material, were successfully fabricated through electrospinning. The effects of the types of the binary fatty acid eutectics on morphological structures, thermal energy storage properties and tensile properties of the composite phase change fibers were studied. The results revealed that form-stable phase change composite fibers possessed the wrinkled surfaces morphologies with fiber diameters significantly larger than that of neat PET fibers. Thermal analysis results showed that the melting temperatures and enthalpies of the composite fibers varied with the types of binary fatty acid eutectics. The lowest and highest melting temperatures were 33.23 oC and 52.82oC, respectively, whilst the lowest and highest enthalpies were 62.75 kJ/kg and 94.76 kJ/kg, respectively. The tensile testing results indicated that the tensile strength of the composite phase change fibers decreased, while the elongation at break of the composite fibers increased due to the loading of the binary fatty acid eutectic.
  • LI Yifeng;HUANG Jianfeng;CAO Liyun
    . 2012, 43(15): 2049-2051.
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    La2CuO4 crystallites were prepared via a sol-gel process using lanthanum nitrate and cupric nitrate as raw materials, citric acid as complexing agent, while distilled water, ethanol, ethylene glycol and ethylene glycol monomethyl ether as solvent, respectively. The influences of different solvents on phase composition, functional group, microstructure and optical property of as-prepared La2CuO4 crystallites were investigated by X-ray diffraction, infrared spectrum, scanning electron microscope and UV-Vis-NIR spectrophotometer. Results show that single La2CuO4 crystallites can be obtained after calcining at 600°C for 2h, except ethylene glycol monomethyl ether as solvent. The morphologies of the samples are nets flake, honeycomb, mesh and blocks when the solvent is distilled water, ethanol, ethylene glycol and ethylene glycol monomethyl ether, respectively. According to UV-Vis-NIR spectral analysis, the corresponding optical band gap of La2CuO4 crystallites is about 1.37eV, 1.30eV, 1.33eV and 1.32eV.
  • WANG Mingguang;XU Yichen;QI Yang
    . 2012, 43(15): 2052-2055.
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    Epitaxial YBa2Cu3O7/La0.7Ca0.3MnO3 (YBCO/LCMO) and La0.7Ca0.3MnO3/YBa2Cu3O7 (LCMO/ YBCO) bi-layers were fabricated on LaAlO3 (LAO) substrate by pulsed laser deposition, and their microstructures were investigated by using high resolution electron microscopy. In YBCO/LCMO/LAO bi-layer, LCMO layer grows on LAO substrate with a layer-island mode, and develops a layered oriented domain structure. YBCO layer consists of c-axis oriented domain. Some defects such as c/3 translational boundary, extra CuO layer and Y2O3 second phase were observed in YBCO film. In LCMO/YBCO/LAO bi-layer, the initial YBCO layer on LAO shows c-axis orientation, and switches to a mixed domain structure containing both c-axis and a-axis when the film thickness reaches to several nanometers. LCMO layer, which comprises a mixed domain of [100]m and [011]m orientation, epitaxially grows on YBCO film. No misfit dislocation was observed between LCMO and YBCO interface, which is characterized by a strain interface.
  • ZHENG Xing;FU Ji;YU Miao
    . 2012, 43(15): 2056-2059.
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    The particle chains of magnetorheological elastomer based on the chain-like model will bend under the effect of compression. The component of the interaction force between the compressive direction and perpendicular to the direction of compression is different after deformation. In this study, influence of chain bending on the magneto-induced compressive modulus was analyzed under compressive mode. The result indicated that the magneto-induced compressive modulus of magnetorheological elastomer gradually increases with the increasing of magnetic field strength and compressive strain, which is due to the effect of the component of magneto-induced force along the compressive direction and magneto-induced restoring force along perpendicular to the direction of compression.
  • FAN Hongtao;LI Jing;LI Zhanchao
    . 2012, 43(15): 2060-2063.
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    A Cd(Ⅱ)-imprinted silica was prepared by hydrothermal-assisted surface imprinting technique using Cd(Ⅱ) as the template, with (3-mercaptopropyl) trimethoxysilane functionalized the surface of silica as a potential sorbent for the selective adsorption Cd(Ⅱ), and was characterized by FTIR, SEM and TGA-DTA. The adsorption property and selective recognition ability of Cd(Ⅱ)-imprinted silica were studied by equilibrium-adsorption method. The results showed that the maximum static adsorption capacities of imprinted and non-imprinted silica were 42.5 and 22.1 mg?g-1, respectively. The experimental data followed the Langmuir adsorption model. The adsorption equilibrium could be reached in 20 min. Kinetic studies indicated that the adsorption followed a pseudo-second-order model. There was no influence of pH values on adsorption capacity of imprinted silica in the range of 4-8. Imprinted silica could be used repeatedly and indicated high selectivity even in the presence of the other metal ions.
  • LAI Zhenyu;QIAN Jueshi;LU Zhongyuan
    . 2012, 43(15): 2065-2070.
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    Apparent morphological, volume shrinkage and compressive strength of magnesium phosphate cement under different temperature conditions were studied in this paper, as well as using XRD and SEM to study phases and microstructure of samples, TG-DSC to study the quality change and thermal effects during heating. Results indicate, compressive strength of magnesium phosphate cement reduces large when heating to 200℃, the strength of samples changes are relatively small between 400℃ to 800℃. The strength of magnesium phosphate cement increased even when temperatures reach 1400 ℃ since sintering phenomena appear. Magnesium phosphate cement structure remains intact among the whole temperature range, but there have been larger change in the volume shrinkage. Magnesium phosphate cement has a good thermal stability.
  • LI Fen;ZHANG Yanping;YANG Ying
    . 2012, 43(15): 2071-2074.
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    The sludge was converted into a series of sludge adsorbents by carbonized pyrolysis and the process was optimized. The structure of the adsorbent was characterized by SEM, BET and aperture analysis techniques and the capability for H2S removal was studied.The results indicate that activating temperature, activating time and solid/liquid ratio of affect the iodine value of sludge adsorbents. The optimum combination is ,namely,that activating temperature is 550℃ activating time is 2.0h, solid/liquid ratio of is 1:2, and the iodine value of prepared adsorbents (SA) is 493.12mg/g; the prepared SA with good capability for H2S removal can meet the requirements of the fine desulfurization, with a space velocity of 4600h-1, the deodorization time can reach 48 min; Moreover, SA is detected to contain various metal elements, with the average pore diameter being about 3.4nm, leading to a superior H2S adsorption and removal ability.
  • QIU Yanfeng;LI Mingwei;CHENG Min
    . 2012, 43(15): 2075-2078.
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    The width of the metastable zone and the induction period of pure and L-alanine added KDP solution were measured in the present paper. According to the classical nucleation theory, the thermodynamic and kinetic parameters of nucleation were calculated, and the effect of additives on nucleation characteristic was analyzed. The results show that the solubility of KDP decreases and the metastable zone width and the induction period increase as the additive concentration increasing. The growth rate of (100) face of KDP with L-alanine has also been investigated at different supersaturation at 35℃. The results show that the growth rate decreases with the increase of additive concentration, and the growth of KDP crystal is dominated by the two-dimensional nucleation mechanism when the supersaturation is higher than 0.04.
  • ZHENG Huasheng;ZHU Sirong;LI Zhuoqiu
    . 2012, 43(15): 2079-2082.
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    In order to reveal the mechanism of temperature sensitivity for polymer-matrix carbon fiber composite (CFRP), the resistance variation with the temperature was measured for the carbon fiber itself and the overlapped carbon fiber interface of cross-ply configuration in epoxy. The NTC effect with good linearity and stability is found for the bare carbon fiber in the test, and it is weaken in the epoxy matrix due to the longitudinal tension caused by the matrix expansion. The carbon fiber interface in epoxy exhibits nonlinear PTC effect in which the interface resistance increases with the temperature with an increasing speed. The temperature sensitivity of CFRP originates from the temperature sensitivity of carbon fiber and the carbon fiber interface, and it is governed by the second one which is more sensitive to the temperature.
  • CAO Jianguo;LUO Hao;JIAO Yang
    . 2012, 43(15): 2083-2086.
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    The ZnO film and vertical nanowire array on the glass and silicon substrates are synthesized successfully using Sol-Gel method. The wetability of the ZnO films and ZnO nano arrays are investigated, which shows the enhancement of the hydrophilic nature of the ZnO films by slight roughness of nanoparticles dispersed, whereas hydrophobic surfaces are obtained induced by the vertical nanowire arrays. A theoretical discussion about the possibility of the air bubble trapping between two vertical nanowires is devoted to the hydrophobicity of the ZnO nanowire array. Additionally, a delicate Electrostatic Force Microscopy is utilized to analyze the charge effect on the wetting characteristics of the ZnO nanowrie array, presenting the consistent result of negative surface charge on the top of the nanowires. Our founding will be helpful to understand the electro-wetting and opto-wetting properties of ZnO nanostructured materials.
  • HUANG Xiaogu;CHEN Jiao;LI Shaobing
    . 2012, 43(15): 2087-2090.
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    Bi2O3/ATO powders were prepared by solid state reaction. The effects of heat treatment temperature on phase composition, morphology, visible light and infrared stealth properties were studied by XRD, SEM spectrophotometer, ultraviolet-visible spectrophotometer and infrared emissivity analyzer, respectively. The results showed that the infrared emissivity of the Bi2O3/ATO powders decreased first and then increased with the increasing of heat treatment temperature. The minimum infrared emissivity reached 0.67 when the heat treatment temperature was 800℃. The reflection peak appeared in the range of yellow optical wavelength and orange optical wavelength. However, both the area and the average of the reflection in the whole visible wavelength increased with the increasing of heat treatment temperature. Therefore, the colors could be adjusted by controlling the heat treatment temperature. Bi2O3/ATO powders were suitable for preparing the multi-colored infrared camouflage packing.
  • FENG Qiming;DONG Faqin;WANG Weiqing
    . 2012, 43(15): 2091-2094.
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    With sol-gel method, La3+-doped TiO2 sol was synthedized using tetrabutyl titanate and lanthanum nitrate as main raw materials, anhydrous ethanol as the solvent, glacial acetic acid as the inhibitor, concentrated nitric acid as the catalyst .The gel was calcined for 3h at different temperature, and then TiO2 powder with different amounts of La3+-doped was obtained. All samples were characterized by XRD, and the photodegradation effect of methyl orange on La3+-doped TiO2 was studied using UV as light source. Water-based magnetic fluids Fe3O4 was prepared by chemical coprecipitation method, La3+-doped TiO2 with different mass fraction of Fe3O4 were prepared by La3+-doped TiO2 compounding with magnetic fluids Fe3O4, and the photodegradation effect of methyl orange on La3+-doped TiO2 with different mass fraction of Fe3O4 and magnetic separation recovery rate were studied. The results show that the amount of La3+-doped and the calcine temperature had impacts on the crystal phase of TiO2, relative content of different crystal phase TiO2 and the photodegradation effect on methyl orange, the photocatalytic activity of La3+-doped TiO2 is superior to the pure TiO2, and the photocatalytic activity of La3+-doped TiO2 is highest in all samples when the amount of La3+-doped was 2.0%, heat treatment temperature was 450℃. When the mass fraction of Fe3O4 was 10%, the photodegradation effect of methyl orange on La3+-doped TiO2 with Fe3O4 increased rapidly with degradation time increasing, reached to 99.4% when degradation time was 8 h, and the magnetic separation recovery rate reached to 97.39%.
  • SHAO Honghong;XU Tao;WANG Xiaojing
    . 2012, 43(15): 2095-2097.
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    In this paper, Mo-Si thin film was deposited on single-crystal silicon(100) substrate by magnetron sputtering. The films were annealed in vacuum and high temperature oxidation test. The surface morphology and microstructure of the films after vacuum annealing and high temperature oxidation were analyzed by SEM and X-ray diffraction (XRD). The results show that at room-temperature, the Mo-Si thin film prepared by magnetron sputtering was amorphous. After vacuum annealing, it was changed into crystalline. The Mo-Si thin film exhibited excellent antioxidation property because of the compact oxidate layer generated outside the substrate.
  • ZHAO Chunwei;PENG Xianghe
    . 2012, 43(15): 2098-2101.
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    The magnetization of a ferromagnetic particle and that of a particle-chain in a static magnetic field are simulated respectively with the FE code ANSYS, based on which the resistance of a particle-chain against the shear deformation of a magnetorheological fluid is analyzed. A micro-macro modeling for the response of MRFs subjected to shearing deformation is then derived by making use of a statistical approach. The results are compared with those obtained with the approaches based on the conventional magnetic dipole model with and without adopting the assumption that the size of the particles is much smaller than the distance between particles, respectively. It shows that the former can better replicate results with FE computation. This verification is significant because the magnetic dipole model is the fundamental element in formulating a micro-macro approach for the analysis of the macroscopic constitutive behavior of magnetorheological fluids.
  • SU Lei;MA Baoguo;JIAN Shouwei
    . 2012, 43(15): 2102-2105.
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    Early hydration law of cement pastes modified with hydroxypropyl methyl cellulose ether and expanded perlite and their mechanism in cement pastes were studied by hydration exothermic rate, XRD, FTIR, DTG and Ca (OH) 2 content. The results show that: Hydroxypropyl methyl cellulose ether can significantly reduce the peak of hydration exothermic rate of cement paste in early stage. Hydration induction period and acceleration period of cement pastes were delayed. It had little retarding influence on middle and late period hydration of cement paste. The peak hydration exothermic rate of cement pastes modified with expanded perlite was decreased.The effect was worse than the hydroxypropyl methyl cellulose. Expanded perlite had no retarding effects on cement hydration. It had obvious coupling effect under combined action of hydroxypropyl methyl cellulose ether and expanded perlite. Hydroxypropyl methyl cellulose ether and expanded perlite can significantly reduce the content of Ca (OH) 2 after 12 hour’s hydration. The content of Ca (OH) 2 in cement pastes respectively decreased by 43.6% and 9.1% than blank samples. After 1 day and 3 days hydration, the trendy of decreasing of Ca (OH) 2 content in cement paste became very slow with both hydroxypropyl methyl cellulose ether and expanded perlite mixing.
  • YANG Yufei;ZHOU Ming;LIU Changlong
    . 2012, 43(15): 2106-2110.
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    Cerium oxide (ceria, CeO2) is one of the most reactive rare earth metal oxides in many application areas. A new preparation method is introduced here to create new structure ceria particles. By adding Staphylococcus albus (S. albus) in alcohol-water solution with HMT as precipitator, nano-sized ceria powders with porous arrays in micro appearance surface were synthesized. The scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermo gravimetric analysis (TGA) were used to characterize and analyze the morphology, microstructure and phase composition of the products, discuss the formation mechanism in the process. Furthermore, the decolorizing performance of the products on methyl orange dye wastes water has been investigated. The results show that synthesized porous arrays ceria particle is about 10nm in dimension, and the porous hole is about 400nm in size. The decolour rate of porous arrays structure can reach 95% or above for methyl orange dye waste water, indicating a good decolorizing performance.
  • HE Hanbing;LIU Feng;SONG Yunfeng
    . 2012, 43(15): 2111-2115.
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    Preferential corrosion of metal phase in cermet inert anode is one of industralization problem, and in order to improve its corrosion resistance to high temperature melt salt electrolyte, NiFe2O4 spinel was coated in the surface of metal phase. Coating experiment result showed that particle size of metal phase after coated is 2-5μm,and agglomeration phenomenon happened. Besides NiFe2O4 spinel was formed in the surface of metal phase, NiFe2O4-x、Cu2O、NiO、CuxNi1-x、NiyFe1-yFe2O4-a and NizFe1-zO were possible found. Moreover, corrosion experiment results indicated that when coating content is 10%、20%、30%、40% and 50%, respectively, annual wear rate is 1.89cm/a,1.73 cm/a,1.65cm/a、1.58cm/ and 2.03cm/a, respectively, and the thickness of metal corrosion layer are all 20-50μm.However, the thickness of metal corrosion layer without coated NiFe2O4 spinel is 200μm and annual wear rate is 4.15cm/a. Thus corrosion resistance to high temperature melt salt electrolyte can be improved through coating NiFe2O4 spinel in the surface of metal phase 20Ni-80Cu.
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  • XIE Taiping;XU Longjun;LIU Chenglun
    . 2012, 43(15): 2116-2120.
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    Strontium magnetic photocatalyst (TiO2-SrFe12O19) was prepared from self-made strontium carbonate and Tetra-n-butyl Titanate by ultrasound technique, when strontium ferrites (SrFe12O19) used as magnetic substrate. Surface properties and magnetic properties of the strontium magnetic photocatalyst were determined by XRD, IR, BET and VSM. The result indicated that the catalyst`s the grain size was in the range of 20~30 nm, and specific surface area was 44.8 m2/g, the average pore size was 7.09nm.Therefore,the catalyst was a mesoporous magnetic material. Saturation magnetization (Ms) and the coercivity (Hc) of the catalyst was 12.9emu/g and 1518.6G, respectively. The high magnetic property was beneficial to separate easily and reuse for this catalyst. TiO2-SrFe12O19 catalyzed the degradation reaction of Methylene Blue (MB), removal ratio was 94.7%.The efficient removal ratio of the photocatalyst was 88% when the catalyst was employed 3 times repeat continually. The activity of TiO2-SrFe12O19 was stable in the process of pollutant degradation.