30 July 2012, Volume 43 Issue 14
    

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  • Development of fabrication processes and adhesion measurement of functional surface coating on magnesium alloys
    GAO Zhengyuan;PAN Fusheng
    . 2012, 43(14): 1817-1821.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    With the development of low carbon economy, applications of lightweight parts in automobiles have an attracted increasing interest. The functional surface coating on magnesium alloys, which are very potential lightweight materials, has become an important research field. Owning to the excellent physical and mechanical properties of magnesium alloys, surface functional coatings based on magnesium alloys were investigated by many researchers in the world. The development status of functional coatings on magnesium alloys by physical and chemical processes was reviewed, and the measurement methods for interface adhesion were discussed. The interfacial toughness of coating on magnesium alloys was specially introduced, and discussed by using the experimental results and model.
    • 研究与开发
  • Highly Selective Fluorescence Detection of Cu2+ by the derivative of Indolizine
    HAN Qiaorong;JIANG Yuliang;WANG Bingxiang
    . 2012, 43(14): 1822-1824.
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    The compound 5 of 2-nitrobenzaldehyde-indolizine was synthesized. Its structure was characterized by using IR, Uv and 1HNMR. The fluorescent and the influence of different transitional metal ions such as Co2+、Ca2+、Zn2+、Cu2+、K+、Ni2+、Mn2+、Pb2+ on thiscompound were studied systematically. The results showed this compound exhibited a highly selective fluorescence quenching effect by Cu2+ ions, while other metal ions almost no quenching happened. The UV absorption spectra increased with the addition of Cu2+ into the solution of 2-nitrobenzaldehyde-indolizine suggesting that chemical reaction occurred between the Cu2+ and this compound. This compound is promising to be the fluorescent probe for the Cu2+ .
  • The high temperature transport and thermoelectric properties of the Zn, Pr co-doping In2O3 ceramics
    CHENG Bo;LIU Yong;LIU Dabo
    . 2012, 43(14): 1825-1828.
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    The polycrystalline In2O3 ceramics co-doped with Zn, Pr were prepared through the spark plasma sintering process. Both thermoelectric transport properties and microstructure of the ceramics were investigated. The co-doped In2O3 by SPS had a remarkable effect on the transport properties. Large electrical conductivity (~100 Sm-1) and thermopower (~200 μVK-1) was observed in dilute Co doped sample. The maximum power factor was found in In1.92(Pr, Zn)0.08O3 sample as 3.5 × 10-4 Wm-1K-2 at 973 K with the ZT value up to 0.10. It reveals that In2O3 polycrystalline ceramics prepared by a spark plasma sintering thus can be a good candidate for n-type thermoelectric materials.
  • Mechanism of potassium hexatitanate whiskers starting from metatitanic acid
    HAN Shiqi;SI Naichao;YIN Hengbo
    . 2012, 43(14): 1829-1832.
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    Potassium hexatitanate whiskers were synthesized starting from metatitanic acid and potassium carbonate when their molar ratio was kept at 1:3.5 by calcination method.The evolution mechanism of potassium titanate prepared with different calcination temperatures was investigated . The sampals were characterized by X-ray(XRD) diffractometry and scanning electron microscopy (SEM). The result show that potassium octatitanate was formed at 600℃ ，accompanied with the increasing temperature, potassium octatitanate was converted to potassium tetratitanate and potassium hexatitanate, potassium tetratitanate was converted to potassium hexatitanate.
  • Research on the Modification and Dissolution-Inhibiting of Calcium Sulfate Whisker
    WANG Li;ZHUANG Chunyan;ZHU Xixi
    . 2012, 43(14): 1833-1836.
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    A kind of hybrid modify agent LZ was designed to inhibit the dissolution of calcium sulfate whisker (CSW) and improve its retention. Different modification conditions were studied to get an optimal method, by which the retention of CSW was improved from 60.50% to 93.67%. The surface properties changes before/after the modification were analyzed and characterized by IR and SEM. It was found that the CSW was coated and adsorbed multiply by the hybrid agents, and a modification model was set up.
  • Sound absorption property of unconventional cell structure Al-Si12 foam core muffler
    WANG Yingwu;ZUO Xiaoqing;CHEN Xianning
    . 2012, 43(14): 1837-1841.
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    The unconventional cell structure Al-Si12 foams, such as Al-Si12 foam with wide pore size range pore structure, Al-Si12 foam with periodic pore structure and Al-Si12 foam with gradient pore structure，were fabricated by infiltration method as the core materials of the mufflers. The sound absorption property of the unconventional cell Al-Si12 foam core muffler has been studied. The results are shown as followings. The sound absorption property of the wide pore size range pore structure aluminum foam core muffler is obviously superior to these with traditional pore structure. The sound absorption performance of the gradient pore structure aluminum foam core muffler is much better than these with wide pore size range pore structure. The sound absorption performance of the periodic pore structure aluminum foam core muffler is as good as these with wide pore size range pore structure. The sound absorption performance of the Al-Si12 foam core muffler is related with expansion chamber structure and flow resistance. Compared with traditional sound absorption materials core muffler, the sound absorption property of the wide pore size range pore structure aluminum foam core muffler is situated between the polyurethane foam core muffler and the centrifugal glass cotton core muffler.
  • Preliminary Synthesis of Nano-pored Polybismaleimide through Electron Beam Initiated Chemical Processes
    XU Yunshu;TANG Jianjun;SU Qianzhi
    . 2012, 43(14): 1842-1845.
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    Selected amount of methyl methacrylate (MMA) was uniformly blended into bismaleimide (BMI) in solution, reaction was induced by electron beam generated by a linear accelerator and micro-phase separated solid structure consisted of imide and radiation degradable chains was obtained. After that, the degraded products were removed through programmed heating up to 300?C, and nano-porous polybismaleimide (PBMI) functional materials were fabricated. The C=C double bonds were found to be activated for chain reaction through FTIR analysis in the irradiation process, as well as the transforming reaction of amic acid to imide. The pore size was measured to be 50nm around by using an atomic force microscope. Results of TG/DTA analysis showed that the weight loss till 300-310?C was equal to the initial usage of MMA, and the pyrolysis peak temperature of the fabricated nano-porous PBMI was measured to be 413?C.
  • Preparation and its Electrochemical performance of Nickel Oxide Doped with Copper Oxide
    XU Hui;PENG Zhenjun;LU Yuxian
    . 2012, 43(14): 1846-1848.
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    Nickel hydroxide doped with Copper Oxide were synthesized by dipping at hydrothermal process. They were annealed in air 300℃ to obtain composite oxide. The samples of phase structure, micro-cosmic morphology and electrochemical properties were characterized by FIR, XRD, SEM and constant-current charge-discharge testing techniques. The results showed that the specific capacitance of the NiO-CuO obtained after calcination as a single electrode was up to 822F?g-1 to 5mA?cm-2 discharge when nickel copper than for 4:1. Then the attenuation rate was only 4.5% after 180 cycle.
  • Study on the mechanical properties and corrosion resistance properties of nano-TiO2/organic-inorganic hybrid acrylic composite coating
    LI Jie;SUN Xiaoying;HANG Jianzhong
    . 2012, 43(14): 1849-1853.
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    The organic-inorganic hybridization acrylic resin was synthesized with sol-gel method, and the effects of the addition of nano-TiO2 on mechanical properties and corrosion resistance properties of organic-inorganic hybridization acrylic composite coatings have been investigated in detail. The result showed that, when adding 15.wt% nano-TiO2, the hardness of coating was improved from 3H to 6H, the salt spray resistance time increased from 100h to 500h, and the resistance got to 106Ω?cm2. Moreover, it can be observed clearly that nano particles dispersed uniformly and densely in the coatings by SEM. The coordination of organic-inorganic hybridization acrylic resin and nano-TiO2 was a good potential method for improving the mechanical properties and corrosion resistance properties of coatings.
  • Polymer-Assisted chemical solution deposition for the preparation of BaZrO3 （BZO）buffer layer for coated conductors
    ZHANG Xin;WANG Wentao;ZHANG Min
    . 2012, 43(14): 1854-1857.
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    Polymer additives have been proposed to assist with the deposition of BaZrO3(BZO) buffer layers on the SrTiO3 (STO) single crystal substrate. Effects of different additives on the quality of final BZO are investigated. The investigation reveals that BZO yielded by polyvinyl butyral (PVB) displays a smooth and crack-free surface, and has an excellent in-plan and out-plan orientation. Additionally, a test with a surface profile shows that the thickness is over 250nm. These results indicate that polymer(PVB)-assisted chemical solution deposition may be an effective measure to obtain thick and high-quality BZO buffer layers.
  • Preparation and Electromagnetic Properties of Carbon Fiber Web/Micro-coiled Carbon Nanofiber Composite
    AN Yuliang;ZHANG Chen;YUAN Xia
    . 2012, 43(14): 1858-1861.
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    The carbon fiber web/microcoiled carbon nanofibers composite was in-situ prepared by CVD method with carbon fiber web as substrate, on which Ni film was electroplated as catalyst. The morphology and structure of as-grown microcoiled carbon nanofibers was characterized by SEM, Raman spectrum and XRD in detail. The effect of main process parameter, reaction temperature, on the growth of the microcoiled carbon nanofibers was studied by experiments. Furthermore, the electromagnetic performance of the carbon fiber web/microcoiled carbon nanofibers composite was measured to demonstrate their wave absorbing ability by wave-guide in the frequency range of 8.2-12.4 GHz. The results demonstrated that the carbon fiber web/microcoiled carbon nanofibers composite with idea morphology and structure have higher tanε value 3.8 than 0.7 of microcoiled carbon nanofibers, in other words, carbon nanofibers/ carbon fiber web composite have high microwave absorbing ability.
  • Preparation and Characterization of Mg-HA/PLA Composite
    TANG Huaichao
    . 2012, 43(14): 1862-1865.
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    To further neutralize the acidic during the degradation of HA(Hydroxyapatite)/ PLA(Poly Lactide Acid) composites, a new type Mg-HA/PLA composites was proposed. The Mg-HA/PLA composites were prepared by using the solution blending method and combining injection molding process.The morphology and physical phase constitute of Mg-HA/PLA composites were analyzed by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD). The mechanical properties of composite materials were tested by electronic tensile testing machine, The simulated body fluid(SBF) was used to study the degradation behavior of Mg-HA/PLA composites. The results show that: Mg-HA/PLA composites can be successfully fabricated by the solution blending method and combining the injection molding process; HA and Mg particles had no obvious aggregation in the PLA matrix and they maintained their phases respectively; the addition of 1.5%wtMg had little effect on the mechanical properties of 5wt% HA / PLA composites; After four weeks immersion, the pH value of solution of Mg-HA / PLA composites was 7.41, while the pH of the HA / PLA composites was 6.95.
  • Effect of Evaporation Rate On the Drying Pattern of Colloidal Suspension
    MA Wenjie;WANG Yuren
    . 2012, 43(14): 1866-1868.
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    Abstract. We study the effect of evaporation rate on the drying pattern of thin concave layer colloidal suspension. Panasonic camera is used to capture macroscopic pattern. It is shown that with the decrease of evaporation rate, Marangoni convection strength descends, more uniformed drying pattern is obtained. Broad-ring pattern can be avoided and homogeneous film is prepared at lower evaporation rate, and reflection spectrum shows the film can be three-dimensional photonic crystal material.
  • Theoretical Analysis and Experimental Study on the Crystallization Kinetics of Sodium Borate in Na-modified Slag
    LI Jie;CHENG Cheng;LU Yan
    . 2012, 43(14): 1869-1871.
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    Borax could be obtained using process of modifying melting boron-rich slag with sodium carbonate－crystal precipitation－water leaching. The leaching rate of boron is directly related to the precipitation characteristics of boron component in the slag. The leaching rate is high if boron component existed in the crystal of NaBO2; otherwise the leaching rate is low in the form of amorphous phase. Calculation of nucleation rate (I) and crystal growth rate (IL) of NaBO2 according to the kinetic theory of non-crystalline solid formation. The optimal temperature of heat treatment for boron-rich slag has been obtained. The effects of heat treatment temperature on the leaching rate of boron have been investigated by chemical analysis method. The results indicate that the optimal heat treatment temperature for slag is in consistent with the calculation temperature. The leaching rate of boron can reach 76.04% while the Na-modified slag is leached by water under high pressure.
  • Simulation analysis of SMR with Tetrahedral amorphous carbon as High impedance material of Bragg Reflection
    LU Xiaoxin;ZHU Jiaqi;WANG Sai
    . 2012, 43(14): 1872-1875.
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    To improve the electricity and acoustic quality of solidly mounted resonator(SMR), realize the new application of tetrahedral amorphous carbon(ta-C) in the field of bulk acoustic wave device, a SMR was designed with ta-C as the high acoustic impedance Bragg reflector, which to simulate the effect of the Bragg reflector to the properties of SMR, as well as the influence of the sp3 fraction in ta-C and the error of thickness of the Bragg reflector on quality factor（Q） by MathCAD. The simulation results showed that the quality of SMR was improved with the increase of Bragg reflectors. With higher sp3 fraction, saturated Q factor can be reached with fewer layers, and there should be at least six layers (three pairs) in order to get an excellent Q factor when the sp3 fraction in ta-C was 80%. The thickness error of Bragg reflector closer to the bottom electrode had greater effect to Q factor. So the design of SMR with high frequency(8GHz) and low loss has been realized.
  • Preparation of carboxymethyl chitosan/benzionic salt and study of its antifouling ability
    DONG Lei;YU Liangmin;LI Xia
    . 2012, 43(14): 1876-1880.
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    In this paper three kinds of carboxymethyl chitosan benzionic salt(CMC-M-B) which could be employed as environmentally friendly antifouling agent were synthesized and their structure were also characterized employing infrared ray. Their antfouling ability was studied through laboratory experiments, median lethal concentration and the growth inhibition curve to algea Nitzschia closterium, and field experiments, testing antifouling panels in shallow submergence. The LC50 value of carboxymethyl chitosan benzionic copper salt(CMC-Cu-B) and carboxymethyl chitosan benzionic Zinc salt(CMC-Zn-B) and carboxymethyl chitosan benzionic bismuth salt(CMC-Bi-B) are 75.98 mg/L 、28.52 mg/L 、437.85 mg/L respectively. The test results also show they are all effective in preventing the protected surface from fouling and the carboxymethyl chitosan salt containing benzoic acid root are more effective than those free benzoic acid root. Their antifouling ability are arranged in the following order: CMC-Cu-B＞CMC-Zn-B＞CMC-Bi-B. The antifouling mechanism of CMC-M-B determines they are environmental friendly.
  • Preparation of Internal Salted Hydrogels and Controlled Release of Nicotinamide
    XUAN Xiaoya;WANG Jing;LI Xin
    . 2012, 43(14): 1881-1884.
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    Internal salted hydrogels were prepared at room temperature using 2-(dimethylamino) ethyl methacrylate (DMAEMA) and itaconic acid (IA) as monomers, N,N-methylene bis (acrylamide) (BIS) as crosslinker, potassium persulfate （KPS）as initiator. The influence of recipe on the formation of hydrogels, the swelling kinetics and swelling mechanism in water, pH sensitivity and their loading and release behavior of nicotinamide in media of different pHs were investigated. The chemical structure of hydrogel was characterized by FTIR. The results showed that the total monomer conversion reduced and the formation of hydrogels was more difficult when n(IA)/n(DMAEMA) was more than 1. The internal salted hydrogels were not of super water–uptake–ability and their swelling mechanism was fit for Fickian process. The swelling ratio of internal salted hydrogels in pH 12 buffer solution was higher than that in pH 3 buffer solution. The nicotiamide loading rate of internal salted hydrogels could exceed 200%. At 25℃,the release of nicotiamide in pH 3 medium was faster than that in pH 12 medium.
  • Solvothermal Synthesis and Characterization of Ni12P5 Microspheres
    LIU Shuling;LI Shu;SHI Qiangqiang
    . 2012, 43(14): 1885-1888.
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    In this paper,Ni12P5 microspheres were synthesized successfully via a solvothermal method, using nickel sulfate (NiSO4.7H2O) as Ni-sourece,ethylene glycol and water as solvent. The products were characterized by X-ray powder diffraction (XRD),scanning electron microscopy (SEM)、transmission electron microscope (TEM) and high-resolution transmission electron microscope (HRTEM), respectively.The results show that nickel phosphide (Ni12P5) were pure tetragonal phase and the particle diameters of microspheres was about 2-5um. Then the effects of different experimental parameters on the products size、morphology and the formation of microspheres and the optical property were also investigated.
  • Preparation and Mechanical Properties of Palygorskite-Carbon Composite Ceramics
    BAO Teng;PENG Shuchuan;CHEN Dong
    . 2012, 43(14): 1889-1893.
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    Abstract：A study was conducted to investigate the possibility of using palygorskite, sawdust and sodium silicate as starting materials to prepare ceramics by high temperature calcination at N2 atmosphere. Results revealed that: palygorskite and sawdust could be used to produce PCCC under the optimal material ratio and calcinated parameters. However, mechanical properties of prepared PCCC have proved to reach and even exceed the requirements in National Standard. The experiments also exhibited that PCCC was a type of superior waterproof materials. Another test in a biological aerated filter reactor showed that microbe can be introduced into internal porous space in ceramics, the ceramics were most suitable to serve as biomedium for municipal wastewater treatment.
  • Interface Fabricating to Improve the Dielectric and Energy Storage Properties of P(VDF-co-CTFE) / BST Composites
    XIA Weimin;ZHANG Zhicheng;CHEN Yuanqing
    . 2012, 43(14): 1894-1898.
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    High-activity Barium strontium titanate(BST) nanoparticles with diameter of 50nm were synthesized via sol-gel method. The BST particles were surface modified with a silane coupling agent (KH550). After that, the BST nanoparticles were then compounded with poly(vinylidene fluoride-co-chlorotrifluoroethylene) (P(VDF-co-CTFE)) in 0-3 connecting form. Using solution casting method, P(VDF-co-CTFE) /BST nanocomposite thick films were prepared on quartz slides. And water-quenching experiments were finally performed on the composite thick films. XRD，TEM，TGA，and FE-SEM were used to characterize the BST particles and the obtained films. Results indicate that the interface of the BST nanoparticles has been effectively improved by surface modification with KH550. Compared with the nanocomposite films with uncoupled BST particles, the ones with KH550-coupled BST particles possess higher dielectric constant (>33), larger breakdown electric field (>270MV/m), and lower dielectric loss. Moreover, the surface modification is also helpful to improve the film saturation polarization (Ps), and decrease the film remnant electric polarization (Pr), thus finally enhancing the film electrical energy density (>6.8J/cm3 for a film sample with BST of 10vol%). The overall results indicate that the surface modification for polymer/ceramic compounds shows great potential in the field of high-energy storage devices.
  • Study on Preparation and Properties of Amorphous Alloy Transformor Core
    YIN Lei;ZHU Zhenghou;LIU Jilei
    . 2012, 43(14): 1899-1902.
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    The proper height iron-core were combined by single core, which were prepared by the low width homemade amorphous alloy ribbons. And then they were incised by line incise. The lancing morphology, structure of the amorphous alloy core were examined, and magnetic properties of cores before and after incised at the power frequency were investigated. The results show that the lancing structure is transforming non crystal to crystal after incised, while the saturation induction density unchanged but the core magnetization became difficult and the core loss has increased. After cutting, the excitation capacity and the core loss of amorphous cores increased to 7.70 VA/kg from 0.32 VA/kg and to 0.30 W/kg from 0.16 W/kg at ?=50Hz, B=1.3T, respectively. Through combining cores to make a transformor core is practicable for it has no effect on magnetic property.
  • The influence of interfacial layer on the electro-magneto- thermo-elastic coupling characteristics of a laminated magneto-electric plate
    GOU Xiaojun;GAO Yuanwen
    . 2012, 43(14): 1903-1908.
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    The electro-magneto-thermo-elastic coupling characteristics of a laminated magneto-electric plate with consideration of the interfacial layer have been investigated. The distribution characteristics of the displacements, the stresses, the electric potentials and the magnetic potentials of the laminated magneto-electric plate are discussed and displayed. The influence of the interfacial layer thickness and different transition approaches of the material properties of the interfacial layer on the displacements, the stresses, the electric potentials and the magnetic potential of the plate are also studied. The numerical result shows that the interfacial transition layer has very important effect on the distribution of stress, electric potential and magnetic potential, especially for the distribution of magnetic potential, these results may be very useful in the functional design and the reliability analysis of magnetoelectricity laminated structures.
  • Preparation of Epichlorohydrin-Modified Rice Straw and Its Characterization
    HUANG Yu;WANGLinshan;CHAO Yue sheng
    . 2012, 43(14): 1909-1912.
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    Etherification of rice straw with epichlorohydrin was carried out at 120℃ for 1-8h in toluene with NaOH as a base. The extent of etherification was estimated by the use of weight percent gain (WPG) as an indication. The effects of reaction time on WPG and etherification effect were investigated. Nature rice straw, pretreated rice straw and epichlorohydrin-modified rice straw were characterized by non-destructive techniques, e.g. Fourier transform infrared (FT-IR), Xray diffraction (XRD), thermal analysis (TA) and scanning electronic microscopy (SEM) to investigate the reaction progress and etherification effect. Characterization results indicated that the crystallinity and the thermal stability of the modified rice straw decreases due to the etherification, and the surface became rough after modification.
  • Synthesis and Characterization of Low-fusing Titanium Dentin Porcelain
    GUO Litong;SHI Yao;DENG Changcheng
    . 2012, 43(14): 1913-1915.
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    The titanium dentin porcelain was synthesized through normal melting-derived route using borate-silicate system. The porcelain was characterized by thermal expansion, X-ray diffraction and cytotoxicity tests. The thermal expansion coefficient of dentin porcelains decreased with the increasing concentration of SiO2. The effects of sintering temperature on mechanical properties of titanium dentin porcelain were studied. Three-point bending strength, fracture toughness and vickers hardness obtained at 760℃ were 85±4.07 MPa, 1.44±0.04 MPa/m1/2 and 402±21.71 kgf/mm2, respectively. The results of X-ray diffraction showed that the dentin porcelain is homogeneous vitreous and without crystalloids. The methyl thiazolyl tetrazolium assay results demonstrated that the cytotoxicity of the titanium porcelain was ranked as 0. At the same time, the titanium porcelain was compatible to cells. The titanium dentin porcelain synthesized in this research could be used for dental implant materials.
  • Development of the CF-4 10W/30 diesel engine oil from the regenerative base oil
    MA Lincai;LIU Daxue;SUN Wei
    . 2012, 43(14): 1916-1921.
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    The molecular distillation equipment was used to separate the waste oil which was pretreated. The light fraction then was hydro treated to produce the regenerative lubricating oil. Elemental analysis shows that the sulfur content in the oil was decreased by about 66.3% after the hydro fining. The regenerative base oil was obtained by blending some 68# mechanical oil into the regenerative lubricating oil. The experimental results showed that the abrasion resistance of the base oil is good, because there remains a small amount of the anti-wear agent after the regeneration process. The base oil’s oxidation stability is poor, due to the antioxidants-sulfur-containing polycyclic compounds was removed in the hydro fining process, which can be improved by adding metal deactivation agent like T551-a derivative of benzotriazole. The regenerative base oil is easy to foaming, which can be reduced by increasing the addition amount of anti-foam agent. The abrasion resistance and pour point of the developed CF-4 10W/30 diesel engine oil are better than the reference oil and other performances are equivalent to theirs. So the developed diesel engine oil can be used as an alternative of the commercial engine oil.
  • Influence of High Voltage on Vanadium Oxide Films Fabricated by High Power Pulsed Magnetron Discharge Ion Implantation ＆ Deposition
    LI Chunwei;GONG Chunzhi;WU Zhongzhen
    . 2012, 43(14): 1922-1926.
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    Vanadium oxide films were fabricated using High Power Pulsed Magnetron discharge plasma ion implantation and deposition technique (HPPMS-PIID), influence of amplitudes of high voltage on phase structure,surface morphology,cross-sectional morphology,and corrosion resistance of vanadium oxide films has been investigated by X-ray diffraction(XRD),atomic force microscopy(AFM),scanning electron microscopy(SEM),and electrochemical tester respectively. XRD showed mainly VO2(111)，also contained a small amount of VO2 ( 111), VO ( 220), VO ( 222) phase.Vanadium oxide films surface were relatively dense and smooth under different high voltages, whose surface roughness were only a few nanometers, which showed good surface quality; vanadium oxide films all represent typical of the density of the columnar crstal growth outlook, vanadium oxide films thickness declined with high voltages. Corrosion resistance of vanadium oxide films improved greatly than pure aluminum, vanadium oxide films corrosion potential was supreme and the corrosion potential increases by 0.093V, but the corrosion current decreases by an order of magnitude; corrosion current was minimum at 15kV, which showed the best corrosion resistance.
  • Mechanical deposition of Ni on copper and its influence on structures and properties
    LIN Wanming;QIAN Yushui;HOU Lifeng
    . 2012, 43(14): 1927-1930.
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    Abstract: To improve the surface properties of materials, Ni alloy layer was produced on pure copper by a combination of surface mechanical attrition treatment and mechanical alloying. The microstructure of the samples fabricated by mechanical deposition was investigated by scanning electron microscopy and X-ray diffraction instruments. Mechanical properties of specimens were tested by micro- hardness tester. The experiment results indicated that nanostructured alloying layer was formed on pure copper by mechanical deposition. With the prolonging of treatment time, micro-hardness and corrosion resistance of specimens were greatly improved.
  • The shrinkage mechanism of amphiphilic low molecular polyether shrinkage reducing agent
    GAO Nanxiao;LIU Jiaping;RAN Qianping
    . 2012, 43(14): 1931-1935.
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    The low molecular polyether shrinkage reducing agent is most widely used on the market at present, but the shrinkage mechanism is still unclear. In order to explore the shrinkage mechanism of water-soluble polyether, the diethylene glycol monobutylether was selected as shrinkage reducing agent(SRA), and the dipropylene glycol which has a different structure was used as a contrast sample. The shrinkage performance experiments showed that the diethylene glycol monobutylether reduced the drying shrinkage and the autogenous shrinkage at 28 days by about 44.4% and 73.1% while the dipropylene glycol reduced the drying shrinkage and autogenous shrinkage by about 19.2% and 23.8%. The properties of the cement paste’s pore solution were measured by ICP and TOC, and the results showed that the shrinkage reducing ability is closely related to the molecular structure of SRA. The pore solutions are filled with dipropylene glycol and diethylene glycol monobutylether in different concentrations after hydration. The K+ concentrations of the pore solution were reduced by about 13.8% and 35.4% at 28 days by dipropylene glycol and diethylene glycol monobutylether respectively while the Na+ concentrations were reduced by about 15.6% and 39.6%, and the surface tensions were also reduced by about 9.2% and 46.2%. It can be seen that, for the amphiphilic SRAs, the shrinkage reducing ability is inversely proportional to the K+、Na+ concentrations and why they perform different shrinkage reductions is that the pore solutions were filled with them in different amounts which can reduce the surface tension and the K+、Na+ concentrations in different degrees.
  • Floc characteristics during synthetic dying wastewater treatment with polyferric chloride - epichlorohydrin-dimethylamine (PFC-EPI-DMA)
    LIU Zhonglian;GAO Baoyu;WANG Yan
    . 2012, 43(14): 1936-1940.
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    Polyferric chloride (PFC) and epichlorohydrin-dimethylamine (EPI-DMA) were applied as raw materials to prepare a novel composite inorganic-organic flocculant (PFC-EPI-DMA) with various intrinsic viscosities (η), basicity (B, OH/Fe molar ratio), and organic component fractions (w(E)). The floc characteristics of PFC-EPI-DMA were extensively examined regarding the decolorizing treatment of synthetic active dying wastewater. The effect of B, η and w(E) on the growth rate, size and time-weighted variance (TWV) of formed flocs were also evaluated through photometric dispersion analyzer. Experimental results indicated that higher w(E) was favorable to floc growth rate, floc size and TWV increase when treating active brilliant red. With respect to decolorizing of active blue, the w(E) influence on floc property was related to coagulant dosage. At lower dosage, the floc growth rate, floc size and TWV was reduced. Meanwhile, lower w(E) was beneficial to the more faster aggregation and growth of formed flocs. However, this trend becomes reversed under comparatively higher dosage conditions. In general, composite PFC-EPI-DMA with comparatively higher η and lower B value could obtain larger and more uniform flocs with faster growth rate.
  • Electromagnetic wave absorption properties of amorphous carbon/ magnetic particle composites
    LI Binpeng;WANG Chengguo;WANG Wen
    . 2012, 43(14): 1941-1944.
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    Electromagnetic wave absorption material comprised of amorphous carbon and magnetic particles was prepared by heat treatment of polyacrylonitrile (PAN) with ultrafine iron powders dispersed in it. The phase composition and morphology of the material were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Electromagnetic parameters of the composite material were measured in the frequency range of 2 ~18 GHz by vector network analyzer and the numerical simulation of microwave reflection loss was conducted. The effects of temperature and coating thickness on electromagnetic wave absorption properties were investigated. This kind of absorbing material is a composite material comprised of amorphous carbon and iron oxide, or iron nitride with electric loss and magnetic loss, and has good absorbing properties.
  • Structure and properties of activated bacterial cellulose
    WANG Jiao;WANG Huaifang;ZHANG Chuanjie
    . 2012, 43(14): 1945-1949.
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    Ethylenediamine and NaOH were separately used as activators to activate BC in order to improve the solubility property of bacterial cellulose in ionic liquid [BMIM]Cl. The optimum activation conditions with ethylenediamine as activator were: concentration of ethylenediamine was 14wt.%, activation temperature was 60 ℃ and activation time was 90 min. And the optimum activation conditions with NaOH as activator were: concentration of NaOH was 10wt.%, activation temperature was 40 ℃ and activation time was 480 min. The structures and thermabl stability of bacterial cellulose and activated bacterial cellulose were characterized by FTIR, XRD and TGA, and their solubility property in ionic liquid [BMIM]Cl was also studied. The results indicate that the hydrogen bond force is weakened, polymerization degree and crystallinity degree are decreased, and the accessibility to chemical solvent is improved in activated bacterial cellulose. The bacterial cellulose activated with ethylenediamine or NaOH as activator dissolved in shorter time in ionic liquid [BMIM]Cl than unactivated bacterial cellulose. Moreover, the dissolution time of bacterial cellulose activated with NaOH as activator was shorter than that activated with ethylenediamine.
  • Experiment study of the thermal conductivity coefficient in the heat transfer process of fatty acids phase change materials
    ZHANG Yi;ZHANG Jingyan;HUANG Bin
    . 2012, 43(14): 1950-1954.
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    Abstract: Due to the state change in the phase change process, the heat transfer process of the phase change materials(PCMs) is an non-line process which has a moving interface. For the non-line heat transfer characteristic, the lauric acid and capric acid mixed fatty acid used as research PCMs, the phase change temperature and latent heat of the PCMs were measured by differential scanning calorimetry(DSC), thermal conductivity coefficient of different mole ratio PCMs were measured by DRE-2C thermal conductivity coefficient instrument, so did the PCMs in different test temperature. A kind of composite PCMs made up of inorganic porous materials diatomite and fatty acid PCMs was produced, the thermal conductivity coefficient and the heat absorption-release performance of this material were tested. The results showed that the thermal conductivity coefficient of fatty acid PCMs has an inversely proportional relationship with the phase change temperature, the higher the phase change temperature, the lower the thermal conductivity. The thermal conductivity of the PCMs grow larger as the test temperature increased. The admixture of diatomite obviously increased the thermal conductivity coefficient of the PCMs and accelerated heat absorption and release rate, which improved heat conductivity performance of PCMs.
  • Fabrication of superhydrophobic surface on ZnO/E-51 composite coating
    WANG Chunqi;JIANG Dazhi;XIAO Jiayu
    . 2012, 43(14): 1955-1959.
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    The ZnO/E-51 composite coating was prepared by vacuum bag pressure method after mechanical stirring the ZnO and Epoxy resin, and then the superhydrophobic surface on ZnO/E-51 composite coating was obtained by chemical etching and surface modification. To characterize of the surface morphology and superhydrophobicity, the scanning electron microscopy and dynamic/static contact angle analyzer were used. The results show that a micro-nanoscal binary rough structure has been fabricated on surface of ZnO/E-51 composite coating by chemical etching; through 1wt% stearic acid modification, the rough structure and superhydrophobic properties of surface can be changed. When the modification time is 30 minute, the maximum average contact angle of surface with water is up to 152.21°.
  • Research on synthesis and purification of hexachlorocyclotriphosphazene
    BAO Dongmei;LIU Jiping
    . 2012, 43(14): 1960-1963.
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    Hexachlorocyclotriphosphazene was synthesized by adopting mixed catalyst/acid binding agent synthesis system. The influences of reaction solvent, ratio of reactants, catalysts, reaction time, reactant particle size on the yield were investigated. Synthetic conditions and purification method were optimized and the best reaction condition was determined．The product was characterized by melting point determination, elemental analysis,infrared spectrometer(IR), XRD and nuclear magnetic resonance(NMR).The result showed that the product obtained is just the target compound．It turned out that the yield of the product was maintained at a level between 75% and 80%, and the purity of the product was increased to 98%. Before polymerization reaction, HCCP needs to be purified by recrystallization and sublimation for the polymerization reaction to be done smoothly.
  • Research on the Compound modification on Magnesium oxychloride cement
    WANG Luming
    . 2012, 43(14): 1964-1968.
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    On the basis of the research on the modification on magnesium oxychloride cement (MOC) with fly ash and phosphate, the phosphate, fly ash and styrene-acrylic emulsion were adopted to improve the water resistance of MOC. The results show that, while adding 20 wt% fly ash, 1wt% phosphate and 5 wt% styrene acrylic emulsion to the cement, the stability of the main crystal phase 5 ?1 ?8 in water and the density and water resistance of the cement were improved effectively, and the softening coefficient and early strength of the cement were greatly improved, respectively reaching 0.90and 48.6Mpa. After a 28-day of water immersion test ,the compressive strength lost a little, maintaining 64.4Mpa.The comprehensive modification effect is remarkable.
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