15 May 2012, Volume 43 Issue 09
    

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  • The Application of New Chelating Fibers in the Enrichment of Metal Ions
    Yao-Ran Sun;Ming-Yu Li
    . 2012, 43(09): 1089-1094.
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    In recent years, chelating ion-exchange fiber has been paid more and more attention in the field of scientific separation research, for its use of extraction，separation and analysis of metal ions. Chelating ion-exchange fiber has strong adsorption and excellent adsorptive selectivity of metal ions. It can be used for recycling, enrichment, separation of metal ions, such as radioactive metal ions, precious metal ions, transition metal ions and rare earth metal ions, etc. In order to improve the adsorption and selectivity of chelating ion-exchange fiber, many chelating ion-exchange fibers of new structure have been prepared recently. This paper reviews the preparation, adsorption performance and application domain of recent new chelating ion-exchange fibers. And the development prospect is also presented.
    • 研究与开发
  • Synthesis and photocuring properties of UV-curable/alkali-soluble acrylic resin
    Quan MENG;Chun-Hui Shen; Yi-Wang
    . 2012, 43(09): 1095-1098.
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    An alkali-soluble photosensitive prepolymer was synthesized as photoresist by one-step process. hydroxyethyl acrylate was reacted with phthalic anhydride at different molar ratios, the influences of synthetic process, such as the reaction time, the concentration of catalyst and feeding method were discussed in details. By using a suitable photoinitiator, this resin was polymerized in the exposure of UV light, a series properties of cured film were investigated. For example, it can stand 10% hydrochloric acid for over 30 minutes and be striped in 1% NaOH within 2 minutes.
  • Material Characterization on the Thermo-viscoelasticity of PP Wood Composites
    Xue Liu;Tong-Liang Du;Xiong-Qi Peng
    . 2012, 43(09): 1099-1101.
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    PP wood composite specimens were tested at strain rates from 10-4 to 10-2 s-1 and at temperate of 90, 130, 170℃. Their mechanical responses were shown to be sensitive both to the strain rate and temperature. Besides, it was found that raising the temperature has an equivalent effect as decreasing the strain rate. Based on Maxwell model, a nonlinear thermal viscoelastic constitutive model was proposed for the PP wood composite. Corresponding viscoelastic parameters were obtained through curve fitting with experimental results. Then the model was used to simulate thermal compression of the wood composite．The predicted theoretical results coincided quite well with experimental data.
  • Study on the Magnetic Properties and Temperature Coefficients of Nanocomposite Nd9.5Fe76Co5Zr3-xNbxB6.5（x=0-3.0) Magnets
    ;Xiao-Hua TANHui XU
    . 2012, 43(09): 1102-1105.
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    Nanocomposite Nd9.5Fe76Co5Zr3-xNbxB6.5 (x=0-3.0) bonded magnets were prepared by melt-spun and vacuum annealing processes. The magnetic properties and temperature coefficients of the magnets were investigated. It could be found that the intrinsic coercivity and maximum energy product increased first, then decreased, while the remanence increased with the increase of Nb addition for the Nd9.5Fe76Co5Zr3-xNbxB6.5 (x=0-3.0)magnets. The addition of Zr and Nb could improve obviously the temperature coefficient of coercivity. The optimal magnetic properties of bonded magnets were obtained for the nanocomposite Nd9.5Fe76Co5Zr1.5Nb1.5B6.5 magnet, that is, Br=0.717T, Hcj=773kA/m, (BH)max=82kJ/m3, α20℃-150℃=-0.111%/℃，β20℃-150℃=-0.356%/℃.
  • FeSiAl/FeCuNbSiB Magnetic Core Prepared by Powder Extrusion
    Yan Du;Xue-Song Hu;Zheng-Hou Zhu
    . 2012, 43(09): 1106-1108.
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    FeSiAl/FeCuNbSiB nanocrystalline powder core is prepared by powder press extrusion, and its magnetic properties are studied at different amounts of FeSiAl composite powder and with glue powder. The results show that: a glue binding formulation of 1% octadecanoic acid, 20% polypropylene and 79% paraffin wax, glue/powder ratio 10:1(weight) FeSiAl/FeCuNbSiB nanocrystalline magnetic core, with a magnetic core density 4.69g/cm3. Composite of FeCuNbSiB nanocrystalline powder (300 mesh) and 200 mesh powder FeSiAl compound, at ratio of FeSiAl powder 200 mesh 30% + 300 mesh 70%(wt) FeCuNbSiB, powder core/glue at 10:1(wt), 44℃ × 0.5hour petroleum ether defatted, heat treatment temperature of 160℃ × 1hour, the magnetic core achieves the best soft magnetic properties, f is 600kHz, μe reaches 16.48, Q equals 57.5. Frequency changes and temperature change on the magnetic powder core effective magnetic permeability effect is small.
  • Microwave-assisted Hydrothermal Synthesis and Characterization of Calcium Carbonate with Novel Morphology
    Xian-yong CHENqin tang;Daijun Liu
    . 2012, 43(09): 1109-1112.
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    The unusual high symmetrical double dagger-like, double flat-like, elongated hexagonal plate-like, elongated parallelogram, polyhedron with hexagon as lateral face , six petals flower-like CaCO3 polymorphs were prepared directly without any additives by the microwave-assisted hydrothermal synthesized method, using calcium acetate and urea as the raw materials. The obtained CaCO3 samples were characterized by means of Scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR). The formation process of CaCO3 polymorphs was also discussed. It was showed that, the structure and morphology of CaCO3 crystals were well controlled by the use level of calcium acetate and urea, and microwave power.
  • Flame Spray Pyrolysis Fabricating Superhydrophobic Coatings on Aluminum Alloy with Its Anti-Collision Property
    Yi JIA;Ren-Liang Yue
    . 2012, 43(09): 1113-1117.
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    Superhydrophobic coatings were fabricated on aluminum alloy substrate via a method combining flame spray pyrolysis (FSP) and surface modification. The FSP method was utilized to form a multi-scale roughness surface by depositing SiO2 nanoparticles directly on to aluminum alloy substrates. Hexamethyldisiloxane (HMDSO) was used as the SiO2 precursor. The surface structure was altered by adjusting the deposition parameters. The coating after fluoration showed superhydrophobicity with a static contact angle up to 154.9 °and a tilt angle smaller than 2°. The superhydrophobic coatings were characterized by SEM and AFM to identify the surface morphology and roughness. The results of electrochemical measurements (electrochemical impedance spectroscopy and polarization curve) showed that anti-corrosion property of aluminum alloy was obviously improved.
  • Hydrothermal and Thermal Decomposition Synthesis of Hierarchical Mesoporous NiO Microspheres and Its Application in Direct Electrotrochemistry of Hemoglobin
    ;Zhen-Feng ZHU
    . 2012, 43(09): 1118-1121.
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    Hierarchically nanostructured NiO microspheres self-assembled by nanoparticles with mesoporous structure were successfully prepared via a microwave hydrothermal and subsequently controlled thermal decomposition method, by using Ni(NO3)2?6H2O as raw materials and poly ethylene glycols (Mw=6000) as a soft template, respectively. The as-prepared sample was well characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N2 absorption-desorption isotherm techniques. The experimental results shown that the as-obtained hierarchical mesoporous nickel oxide microspheres have a high surface area of 234 m2/g and narrow pore distribution at 3.25 nm. Direct electrochemistry of hemoglobin (Hb) was investigated on a room temperature ionic liquid modified NiO paste composite electrode. Hb was immobilized on the composite electrode and a pair of well-defined, quasi-reversible cyclic voltammetric redox peaks was obtained, which was characteristics of Hb Fe(Ⅲ)/Fe(Ⅱ) redoxs couples. The formal potential (E0?), the electron transfer number (n), and transfer coefficients (α) was calculated as -0.278 V (vs Ag/AgCl), 1.104 and 0.476, respectively, which indicated that one electron was transferred between heme group of Hb and the electrode. The average apparent heterogeneous electron transfer rate constant (ks) obtained for Hb was 0.775s-1.
  • Synthesis and Photovoltaic Properties of Perylene Diimide Derivatives with Aryl Electron-donating Substitutes at Bay Positions
    Min-Min Shi;Feng Hao;Li-Jian Zuo
    . 2012, 43(09): 1122-1125.
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    Abstract: A series of perylene diimide derivatives with aryl electron-donating substitutes (triphenylamino and N-phenyl-carbazolyl groups) at the bay positions, 2a~2d were synthesized via Suzuki coupling reaction. Their optical and electrochemical properties were characterized by UV-vis absorption spectra and cyclic voltammetry. It was found that 2a~2d displayed broader and more red-shifted absorption bands. Furthermore, their frontier orbitals energy levels were elevated, showing electron-donating ability. Therefore, 2a~2d were applied as electron donors to fabricate organic solar cells, which exhibited obvious photovoltaic responses.
  • Preparation and Luminance properties of the single white emitting phosphor Dy3+ doped Ca2SiO3Cl2
    Bang-Qing WANG
    . 2012, 43(09): 1126-1129.
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    Ca2SiO3Cl2:Dy3+ white light phosphors was synthesized by sol-gel method. The phase of the samples was characterized by powder X-ray diffract ion (XRD), it has tetragonal system. The phosphor shows two major emission peaks locating at 482nm and 573nm by the near ultraviolet excitation peak of 350nm, which correspond to the 4F9/2→6H15/2 and 4F9/2→6H13/2 characteristics transport of Dy3+, Monitoring the strong emission peak at 573nm, the excitation band was covered from 300nm to 470nm and the main peak of was located at 350 nm. The emission intensities increase with extending of the holding time. The experiment results suggested that the strongest emission was obtained when the concentration of the Dy3+ ions was 0.02mol -1.
  • Materials Optimization and Preparation of WS2 Soft Coated Tools
    Yun-Song LIAN;;;;;
    . 2012, 43(09): 1134-1138.
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    Stresses due to thermal mismatch between substrate, interlayer and coating developed in WS2 soft coatings when cooled down to room temperature from deposition temperature. Two finite element models (FEM) were established to simulate and analyze thermal mismatch stress. Results show that mismatch of Young’s modulus and coefficient of thermal expansion is significant to residual thermal stresses, while Poisson’s ratio has little influence on them. WS2 coatings were deposited by medium-frequency magnetron sputtering technique, multi-arc ion plating technique and ion beam assisted deposition technique on the selected substrates and interlayers. The properties tested proved the analysis of FEM and found that residual thermal stress had great influence on the properties of WS2 soft coated tools. Another result is that Zr interlayer was proved to promote the growing of WS2 Ⅱ texture.
  • Lifetime and Electrochemical Properties of Ti/MnO2 Electrodes with Multivariant Intermediate Layers
    Xiu-Li Song;Zhen-hai LIANG
    . 2012, 43(09): 1143-1146.
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    Acid-proof Ti based-MnO2 anodes with multivariant Intermediate layers were prepared by thermal decomposition method and characterized by SEM, XPS and XRD, the lifetime of anodes was determined in 1.0 mol/L H2SO4 solution at 60 ℃ by fast life method, the anodic kinetic parameters(a, b, i0)are examined, and the electrochemical properties of the electrodes was discussed with dual barrier model. The results show that the lifetime of Ti/RuO2+SnO2+ MnO2+Sb2O4/MnO2 at 4 A/cm2 can be as long as 58 h, electrochemical kinetics indicates that the active energy for oxygen evolution is lower at the anode, a is smaller and i0 is larger , so they are better anodes materials in acid solution.
  • Study on the TiO2 nanotube array films for Photocathodic protection of 304 stainless steel
    Hai-Qing Qi;Yan-Feng Zhu;Juan Zhang;Rong-gui Du
    . 2012, 43(09): 1147-1150.
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    Highly ordered TiO2 or Fe doped TiO2 nanotube films were prepared on the surface of pure titanium by an anodic oxidation method in 0.5% NH4F + 1.0 mol/L (NH4)2SO4, 0.5% HF and 0.5% HF + 0.10mol/L Fe(NO3)3 solutions, respectively. The morphology, the structure and composition of the as-prepared TiO2 nanotube films were characterized by SEM, XRD and XPS. In the meantime, the performances of photocathodic protection of the films were evaluated by electrochemical measurements. The results indicated that the films mainly consisted of anatase TiO2. When 304 stainless steel in a 0.5 mol?L-1 NaCl solution was coupled to the TiO2 film in a 0.4 mol?L-1 Na2SO4 solution, its interfacial reaction resistance and the electrode potential decreased steeply under ultraviolet illumination, which indicated that TiO2 nanotube arrays could produce a good photocathodic protection effect for the stainless steel. Especially the potential of 304 stainless steel coupled to the Fe doped TiO2 film decreased by 450 mV under illumination, and remained lower than the corrosion potential after the light source was cut off for about 6 h，showing a better photocathodic protection effect.
  • Study on preparation and properties of P(AM-AMPS) microgels by dispersion copolymerization
    ;chen ming qing
    . 2012, 43(09): 1151-1154.
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    A series of crosslinked P(AM-AMPS) microgels were prepared by dispersion copolymerization of acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) using 2,2'-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (VA-044) as initiator, N,N'-methylenebisacrylamide (Bis-A) as crosslinker, and polyvinylpyrrolidon (PVP K-30) as dispersion stabilizer in an ethanol-water media. The effects of volume ratio of ethanol to water, mass ratio of AM to AMPS, content of stabilizer and initiator on average particle size of P(AM-AMPS) microgels were studied systematically. The results showed that particle size increased with increasing water content in the medium and initiator concentration, whereas decreased with increasing stabilizer amount or content of AMPS in tatal monomers. Results of differential scanning calorimeter (DSC) showed that the glass transition temperature of the microgels enhanced with increasing AMPS content. The swelling and salt-resistant properties of the microgels were also preliminarily studied, and they may be used as water plugging material in oil exploitation.
  • Preparation and property of Mi-Ti solid solution alloy with BCC structure
    Zhi-Qiang Lan;Hui-Yuan Zheng;Wen-Ning Yan
    . 2012, 43(09): 1155-1159.
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    The Mg70-xTi12+xNi12Mn6(x=8, 16, 24, 32) alloys were prepared by mechanical alloying, the structure and property were investigated by X-ray diffraction(XRD), Differential thermal analysis(DTA), Pressure–Composition Isotherm(PCT) and Scanning Electron Microscope(SEM) measurements. When the milling time increased, The diffraction peaks of HCP structure were weaken and broaden, the solid solubility and the degree of amorphous increased. When milled 200h, there was BCC structure appeared in Mg46Ti36Ni12Mn6 and Mg38Ti44Ni12Mn6 alloy. The hydrogen storage capacity of Mg70-xTi12+xNi12Mn6(x=8, 16, 24, 32) alloys was 0.83.wt%,0.68wt.%,1.36wt.% and 0.41wt.%, respectively. DTA results show that the first endothermic peak of the alloys appeared at 670K, 688K, 593K and 662K. In order to improve the hydrogen storage property of the Mg46Ti36Ni12Mn6 alloy, TiF3 and Nb2O5 were chosen as additive. For example, after the Mg46Ti36Ni12Mn6 as-mixed (without milling) powder +5wt.%M( M= TiF3, Nb2O5) were milled 200h, the hydrogen storage capacity of Mg46Ti36Ni12Mn6+5wt.%M( M= TiF3, Nb2O5) alloy reached 2.33 and 2.36wt.% , respectively. TiF3 and Nb2O5 as additive could significantly improve the hydrogen storage capacity of Mg-Ti alloy.
  • Effect of LiFePO4-LiNi1/3Co1/3Mn1/3O2 Blended Cathode Material on the Performance of Li-ion Batteries
    Jun-Qing Dou;Xue-Ya KANG;
    . 2012, 43(09): 1160-1163.
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    The LiFePO4/C composite and LiNi1/3Co1/3Mn1/3O2 are synthesized by rheological phase assisted with carbon thermal reduction method and carbonate co-precipitation method respectively. Then the two materials are fully blended by powerful stirring, and the effect of blending ratio on the electrochemical performance of the blended material are studied via galvanostatic charge/discharge measurement and electrochemical impedance spectroscopy (EIS) at room temperature. The results showed that the electrochemical performances (include rate performance, stability performance, higher discharge and higher specific energy) of the mixed electrode are improved effectively due to the synergy effect between LiFePO4 and LiNi1/3Co1/3Mn1/3O2 after blending.
  • Research of Influence Factors on the Mechnical Properities of PA6/EPDM-M/CaCO3 ternary composite
    Yu-Xin DONG;
    . 2012, 43(09): 1164-1167.
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    Abstract: PA6/EPDM-M/CaCO3 ternary composite was prepared by the two step compounding route. The effects of the sizes of CaCO3 and its dosage, the dosage of EPDM-M and premix time on the mechanical properties of the ternary composites were studied. The results showed that the size of CaCO3 was the key factor, especially to toughness of the ternary composites. The results of SEM investigation indicated that the composites which contained the CaCO3 partical size was lesser emerged more obvious plastic deformation when they suffered impact, and the fracture surface present microfiber-forming that lead to higher impact strength.
  • Synthesis and Optical Nonlinearities of Novel Nickel(Ⅱ) Complexes Containing 2-Arylimidazophenanthroline
    Zhi-Bing Cai;Mao Zhou
    . 2012, 43(09): 1168-1172.
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    Three new nickel(Ⅱ) complexes containing 2-aryl-1H-imidazo[4,5-f] [1,10]phenanthroline were designed and synthesized. Their structures were confirmed by UV, IR, MS and elemental analysis. By using femtosecond laser, the off-resonant third-order optical nonlinearities of the complexes were measured with degenerate four-wave mixing technique. The third-order nonlinear optical susceptibilities are 3.99～4.36×10-13 esu. The nonlinear refractive index n2 are 7.33～8.03×10-12 esu. The second-order hyperpolarizabilities γ of the molecules are 3.98～4.37×10-31 esu. The response times are 50～86fs. The influence of the molecular structure on the third-order optical nonlinearity was studied. The factors such as extended π-conjugated electron system, strong nonplanar intramolecular charge transfer lead to the high third-order optical nonlinearity.
  • Fabrication and drag reduction property of film with micron-scale riblet surface
    Bei-Bei Feng;Jia-Dao Wang;Da-Rong Chen
    . 2012, 43(09): 1173-1176.
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    Abstract：A kind of film with rule micron-scale riblets was prepared using hot wheel pressing technique. A surface mapping microscope was utilized to study the surface of the riblet film. The results shows rule micron-scale riblet structure was fabricated on the film surface. Control morphology configuration of riblet surface through hot wheel morphology. Test results in a FD06 wind tunnel showed remarkable drag reduction rate on the riblet film. The drag reduction mechanism was discussed.
  • Study of Characteristics of Photolithography medium with Sub-wavelength Resolution
    Xiang-Xian WANG;Hong-Fei Shi;Dou-Guo Zhang;Hai Ming
    . 2012, 43(09): 1177-1180.
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    Using 365nm wave band light sources and SEM, step tester, AFM and ellipsometry, the chemical and physical characteristics, those are developing velocity, contrast, film thickness and refractive index, of photolithography medium X AR-N 7700/30 resist with sub-wavelength resolution are studied. The developing velocity of the unexposed part of the resist is 23.15nm/s, and that is 1.85nm/s for the exposed part. The contrast of the resist is as high as 2.5. The thickness of the spin coating resist film can reach to 45nm, when the resist is diluted to weight concentration 30%.
  • Study of rolling lubrication regimes and surface quality of copper foil
    Na-Na Liu;Jian-Lin Sun;Di Wu
    . 2012, 43(09): 1181-1184.
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    Cold-rolled copper foil experiment was carried on with different kinematic viscosity of rolling oil and different pass reduction rate. The Surface morphologies were characterized by laser scanning confocal microscopy and surface profiler. Film thickness ratio and friction coefficient were got. The effects of rolling oil kinematic viscosity and pass reduction rate on oil film thickness, surface roughness and forward slip value of copper foil were studied. The definition of lubrication regime of rolling deformation zone was given from the film thickness ratio, friction coefficient and surface quality under different lubrication conditions. The results show that when the kinematic viscosity of rolling oil is γ40≤15mm2/s, film thickness ratio is λ→0 and friction coefficient is μ≈0.1-0.2. It is in boundary lubrication regime. The surface quality is excellent. When the pass reduction rate is 20%<ε≤60%, film thickness ratio is λ→0 and friction coefficient is μ>0.1. It is in boundary lubrication regime. The surface quality is excellent. The kinematic viscosity of rolling oil should be 10mm2/s and the pass reduction rate is 30% in order to get high surface quality copper foil. That is, the best lubrication regime of copper foil is boundary lubrication regime.
  • Dielectric properties of graphene/epoxy composites
    Hong-Song Song;yang cheng;Da-Bo Liu
    . 2012, 43(09): 1185-1188.
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    The fully oxidized graphite oxide(GO) was prepared by Staudenmaier method, and single layer of graphene was obtained through the thermal expansion mechanism. The oxide degree and oxygen containing functional groups of graphite oxide had been investigated by FT-IR, TG; the microstructure of natural graphite (NG), GO and graphene had been analysed by SEM and TEM. The graphene/epoxy nanocomposites had been prepared by ultrasonic processing and mixture method. Dielectric results showed graphene could imporve dielectric constant of PVDF，and when the quality ratio of graphene got 0.25%, the permittivity of composite got to 25, which was 4 times of pure epoxy. A novel ideal of graphene’s application in dielectric and preparation high charge storage density capacitor of low cost was expolred.
  • The Culture of Compound Bioflocculant and the Analysis of Its Activated Components
    Ying YANG;He YAN;Fen LI;
    . 2012, 43(09): 1189-1192.
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    Abstract: During the preparation of compound bioflocculant(CBF) from straw cellulose, culture condition of compound bioflocculant(CBF) was optimized. The distribution of the flocculation activated substances in fermentation fluid, the activated components of CBF were also investigated. The results indicated that flocculants producing bacteria of CBF should be inoculated into sterilized fermentation fluid for 3 days and cultured under the condition of 30℃ and 140rpm when cultivated in breeding shaker. Flocculants producing bacteria had a better flocculation effect when fermentation time was 36 hours and pH was adjusted to 7.2.CBF was a kind of large molecules bioflocculant, mainly consist of Polysaccharide. CBF exhibited good thermal stability. The flocculation activated substances of CBF mainly distributed in upper phase.
  • Preparation and Luminescence Properties of Zn3(BO3)2 Doped with Ce3+and Mn2+
    Run-Geng Zhang;Hu-Fang Cao;Guang-Jun ZHOU
    . 2012, 43(09): 1193-1196.
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    The Zn3(BO3)2nanocrystals and the Zn3(BO3)2 samples doped with different mole fraction of Ce3+ and Mn2+ were prepared by co-precipitate method at 700°C and under a short sintering time. The luminescent properties and morphologies of products were investigated by Fluorospectrophotometer, X-ray diffractometer, and transmission electron microscope. The results indicate that the Ce3+-doped samples (Zn3(BO3)2:Ce3+) exhibit strong emission from 340 to 400nm. Furthermore, the luminescent intensity of the Zn3(BO3)2:Ce3+ sample doped with 0.5% in mole Ce3+ reaches the maximum value. The Ce3+ions substituted for Zn2+in the host and acted as emission centers, and Mn2+ acted as activator. The position of the emission peak was unchanged, but the emission intensity of Ce3+, Mn2+ co-doped samples was changed obviously with the addition of Ce3+. The luminescent intensity of the Zn3(BO3)2samples doped with 0.5% in mole Ce3+ and 0.7% in mole Mn2+ reaches the maximum value.
  • Effects of CdCl2 Thermal Annealing on CdZnTe Thin Films Deposited by Close-Spaced Sublimation
    Jun-Li Tong;Wan-Qi Jie;Jun-Ning Gao
    . 2012, 43(09): 1197-1199.
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    Abstract：The CdZnTe polycrystalline thin films were deposited by close-spaced sublimation(CSS) and then annealed with CdCl2 coating. The influences of the CdCl2 annealing on the morphology, composition, structure and optical properties of the films were studied by SEM, EDS, XRD, UV spectrophotometer, and I-V mesurements. The SEM results show that after annealing the grains are more uniform, and the grain sizes are increased significantly. The XRD results show that the FWHM of the (111) peak, which is the strongest diffraction of the CdZnTe films, reduced and the (111) texture is enhanced after annealing. The optical transmittance decreases and the forbidden edge shifts toward longer wavelength with, indicating the decrease of the optical band gap. The resistivity of the film decreases by two orders of magnitude after annealing.
  • The research of heat stability of Co-Al-HT/MgAl-HT and the structure of oxide powder
    Tao Wang;An-Qi Wang;Feng Yu
    . 2012, 43(09): 1200-1203.
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    CoAl-HT and MgAl-HT samples were prepared by the method of coprecipitation. Then samples were calcined in 800℃ for 4h to give spinel oxide powder. After that the structure and heat stability were characterized by the methods of powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and simultaneous Thermogravimetry analysis (TG). The results of XRD and FT-IR showed that the typical diffraction peaks, which proved the formation of layered structure of HT and the crystal form of MgAl-HT was better than that of CoAl-HT, were observed and compared in two samples. The XRD results of oxide powder indicated that the spinel structure was formed in two samples. And the structure of CoAl2O4 was more perfect than of MgAl2O4. Besides TG demonstrated that MgAl-HT is higher heat stability than CoAl-HT.
  • The study of SiO2 insulating film for low voltage-driven microfluidic chip
    Hong-feng Lv;Wei-Ping Yan;Jie-Chao Li
    . 2012, 43(09): 1204-1206.
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    The silicon dioxide (SiO2) insulating film was fabricated by electron-beam evaporation technique. Different conditions of preparation for the SiO2 film were studied. Micro-morphology, depth and compositions of SiO2 film was investigated by AFM, step profiler and XRD. The electrical properties of the film were determined by measuring I/V characteristics in a metal-insulator-metal (MIM) structure. The results showed that when the substrate temperature was at 300℃ and the thickness of SiO2 film was 4μm, the surface of the film is smooth and uniform. The breakdown voltage is higher than 200V and breakdown strength is greater than 500 KV/cm. It meets the requirements of the insulating film for the low voltage-driven micro-fluidic chip and has been validated through the practical experiment of the sample driven.
  • Effect of preparation process on the microstructure and electrochemical performances of (LaCe)1.0(NiCoMnAl)5.2 high power hydrogen storage alloys
    Yi-Wen CHEN;Yun-Gun Chen; Ding Zhu
    . 2012, 43(09): 1207-1211.
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    The effects of rapid quenching, heat treatment and rapid quenching with heat treatment on the electrochemical performances of casted (LaCe)1.0(NiCoMnAl)5.2 hydrogen storage alloys were investigated. XRD, SEM and EDS analysis found that the distribution of the elements become more homogenous after heart treatment. The results of electrochemical measurement show that, Different preparation processes had negligible influence on the activation performance. The as-cast alloy has the best high power dischargeability (HRD)，the 1C ,3C,5C and 10C rate capacity retention of the alloy was 95%,76%,72% and 35%. Compared with the as-cast alloy, after heat treatment, the cycle stability had improved, but the HRD decreased. The electrochemical performance of the quenched alloy has rapidly reduced. The capacity retention after 50 cycles of rapid quenching alloy with heat treatment increased to 96.7%.The HRDs of the as-cast alloy and rapid quenching alloy with heat treatment were closed.
  • Study on Phase Transition Current Characterization dependent on Temperature and Electric Field for Antiferroelectric Thick Films On Silicon Substrates
    Yu-Hua Yang;Miao-Xuan Du;Xin-Feng Guan
    . 2012, 43(09): 1212-1216.
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    (Pb,La) (Zr,Ti) O3 antiferroelectric thick film which had high (100) orientation, smooth surface and dense structure was prepared on Pt(111)/Ti/SiO2/Si substrate by sol-gel technology. The electrical properties of (Pb,La) (Zr,Ti) O3 antiferroelectric thick film under various temperature and dc electric fields were studied. The experimental results show that: antiferroelectric thick film happened mutual phase transformation of antiferroelectric, ferroelectric and paraelectric depending on temperature and electric field. The phase transition temperature of antiferroelectric - ferroelectric gradually decreases with the increase of applied electric field. The peak value of dielectric constant decreased from 2410 to 662. The phase transition current density increased from 2.21 × 10-7A/cm2 to 8.52 × 10-7A/cm2. The phase transition electric field of antiferroelectric–ferroelectric gradually decreases with the increase of applied temperature field. The relevant saturation polarization changed from 39uC/cm2 to 31uC/cm2. The phase transition current density decreased from 2.89 × 10-5 A/cm2 to 8.8 × 10-6A/cm2. The phase transition current characterization can be effectively adjusted by coupling application of temperature field and dc electric field.
  • Magnetic Property of Chemical Deposition CoNiP Thin Films and Magnetic Recording Performance in Magnetic Sensors
    Hai-cheng Wang;En Zhang;Li-jin Wang;
    . 2012, 43(09): 1217-1220.
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    CoNiP thin films were prepared by chemical wet depositon, and the effect of plating paremeters on CoNiP magnetic property and magnetic recording performance in magnetic rotary encoders were studied. The results showed that, the films coercivity and squareness ratio decreased with the increasing of plating time. When the plating time was 3 minutes, Co-Ni-P film coercivity was 534 Oe and squareness ratio was 0.55, seperately. X-ray diffraction and scanning electron microscopy results indicated that, with the plating time increased, the films coercivity decreased, the grains grew larger, and exhibited a preferred orientation. The CoNiP film was used to make a 60 mm diameter magnetic drum of a magnetic retory encoder. The recording performance testing results revealed that the CoNiP films could be recorded 2048 original magnetic poles while the amplitude of the output square waves were uniform. It is suggested that the chemical deposition CoNiP films could be a promising candidate as recording media for high accuracy and high resolution magnetic rotary encoders.
  • Study on Field Emission Properties of CNTs electroless plating with Ag
    Yun YE;;;
    . 2012, 43(09): 1221-1224.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Ag were deposited on the surface of carbon nanotubes (CNTs) by electroless palting method, and the field emission properties of CNTs electroless plating with Ag were studied. The carbonyl, carboxyl and hydroxy groups on the surface of CNTs were produced by oxidization in mixed acid. The turn-on field of CNTs electroless plating with Ag was 0.19 V/μm, and the maximal emission current achieved 6 mA/cm2 at the field of 0.37 V/μm, which the field enhancement factor was calculated as 25565. The results showed that the improvement of emission stability was attributed to the the electronic and thermal conductivity of CNTs, which caused by Ag electroless plating on CNTs surface. The proposed CNT/Ag cathodes possess good field emission properties and have potential for application in field emission displays.
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