15 April 2013, Volume 44 Issue 07
    

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    综述·进展
  • Research progresses on the composition design and property’s adjustment of sodium bismuth titanate based lead-free
    LI Fang-xu;LIU Chao;XIAO Ding-quan
    . 2013, 44(07): 913-917.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The sodium bismuth titanate (Bi0.5Na0.5TiO3-BNT) based lead-free piezoelectric ceramics, which was considered as one of the most promising perovskite (ABO3) lead-free piezoelectric ceramics, were most studied worldwide. The researches in this area before 2006 were introduced by the author’s group and published in this periodical. In recent years, researches on BNT-based lead-free piezoelectric ceramics are still one of the central issues of the international piezoelectric and ferroelectric materials. In this paper, the substitution of A and/or B in the BNT-based piezoelectric ceramics, the composition design on the multiple components, the improvements of the properties through different doping ions; as well as the improvements of the processing technique for BNT-based ceramics since 2006 are summarized and discussed, in which the construction of the morphotropic phase boundary (MPB) with component design and property’s adjustment through various methods are mainly emphasized. The research prospects in the near future are also mentioned in this manuscript.
    • 研究·开发
  • Preparation of Cu/ZnO composites and their photocatalytic property
    LIU Hua-rong;ZHANG Feng-zhang;WU Xiao-feng;LI Xiang-qi;ZHOU Zuo-wan;FAN Xi-mei
    . 2013, 44(07): 918-921.
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    Metal Cu nanoparticles deposited on the seed of ZnO surface were prepared via chemical deposition method to composites. The chemical composite structure and morphology of Cu/ZnO composites were characterized and studied in detail by XRD and FESEM. And the photocatalytic properties of the samples was also studied. It is found that metal Cu nanoparticles can load on the ZnO particles successly. Largely improvements in photocatalytic property for the samples with increasing Cu content from 23.9wt% to 55.6wt% are observed. And the photocatalytic property of the sample with Cu content of 38.6wt% is the most remarkable, the degradation rate of MO increased to 96% after 40 min.
  • The Synthesis and Characterization of Nano-SiO2/Polyurethane/Epoxy Resin Composites
    LIANG Wei;LI Zhen-jiang;ZHANG Lin
    . 2013, 44(07): 922-925.
    Abstract ( ) Knowledge map Save
    Abstract: Chemical functionalization on nano-scaled silica particles and prevention of agglomeration through the reaction between the silanol group of silica and oxirane ring of reactive diluents, E-44 and glycidyl-terminated PU, and outstanding performance of TDE-85 epoxy resin, made up of the nano-SiO2/polyurethane/epoxy resin composite. The structure of which was characterized by FT-IR, TGA, DMA, SEM and universal testing machine, the results showed that the modification of nano-scaled silica particles has success synthesize, the nano SiO2/polyurethane/epoxy resin composite was more excellent performance than epoxy resin and G/E-polyurethane/epoxy resin/reactive diluents composite, it’s the highest Tg was 78℃ with nano-scaled silica particles, the morphology of section showed good compatibility and prevention of agglomeration, the highest tensile strength and impact strength were appeared when joining 3% of the nano-scaled silica particles, its 78.23MPa and 50.85KJ/m2 at room temperature, its 93.09MPa and 62.56KJ/m2 at liquid nitrogen temperature(-196℃) ,respective.
  • Effects of silica on phase transformation of alumina gel fiber
    HE Jing;LIN Zhi-jun;ZHANG Li;DING Ma-tai;CHEN Li-fu
    . 2013, 44(07): 926-931.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Silica sol is prepared by the hydrolysis of tetraethyl orthosilicate (TEOS) and using urea as the catalyst. It is used to suppress the α-Al2O3 phase formation during the heating of alumina gel fibers. 29Si NMR, 27Al NMR, FTIR, DTA, XRD, SEM and TEM are used to characterize the silica sol and the alumina-silica fibers. It has been found that the silica sol is nearly neutral and highly stable. It contains silicic acid Si(OH)4 as the major silicon species. The silica sol can coat the alumina sol particles efficiently and interact chemically with the Al-OH groups of alumina sol to form the Al-O-Si linkages. The Al-O-Si film separates the transitional alumina crystallites from coarsening, suppressing the nucleation and crystal growth of α-Al2O3.
    • 研究 开发
  • The structure and electrochemical performance of V2O5 powder prepared by hydrothermal synthesis at various acidification conditions
    SHI Mei-yuan;Zhao Gao-ling;DONG Wei-xia;HAN Gao-rong
    . 2013, 44(07): 932-935.
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    In order to investigate the effects of acidification conditions on its microstructure and electrochemical performance, vanadium pentoxide powder was prepared by hydrothermal synthesis and post heat treatment of ammonium metavanadate solution which was acidized by nitric acid or oxalic acid. The microstructure and electrochemical performance of the powder were investigated by X-ray diffraction (XRD), field emission scanning electron microscope (SEM), transmission electron microscope(TEM) and electrochemical workstation, respectively. The results showed that the powder was pure vanadium pentoxide. Both the pH value of the precursor solution and the radical anion of the used acid had influence on the crystal growth and microstructure of the final powder. Among all, the powder obtained by nitric acid acidizing ammonium metavanadate solution to pH=3 was nanorods about 100 nm in diameter. Its 30th discharge specific capacities were both about 150 mAh/g at 0.5C and 1C discharge rate, and behaved better at rate capability.
    • 研究·开发
  • Study on Filtration Performance and Mechanism of Melt-blown Polypropylene Electret Web Used as Air Filter Material against Challenge Aerosols with Different Chemical Properties
    XIAO Hui-ming;XIE Wen-hu;CHEN Gang-jin
    . 2013, 44(07): 936-939.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper the filtration performance of melt-blown polypropylene electret web used as air filter material were investigated when ionic compound (KCl) and polar compound (DEHS, diethyl hexyl sebacate) were used as challenge aerosols. The impact of charge characteristics, particle size and flow rate of challenge aerosols on filtration performance were explored. The contribution of inertial, diffusion and electrostatic effect to the filtration mechanism were discussed. The results show that the filtration performance for challenge aerosols with different chemical property differs dramatically. KCl exhibits better filtration performance than DEHS. That could be attributed to the unique electrostatic filtration mechanism for electret. When KCl is used as challenge aerosol, the phenomenon of most penetrating particle size (MPPS) was not observed, and the electrostatic filtration mechanism is dominated in filtering process. When DEHS is used as challenge aerosol, the value of MPPS is around 0.08μm, which is much less than 0.3μm simulated by classical single fiber filtration mechanism. In the case of DEHS, inertial and diffusion effect are still dominated filtration mechanism, while the electrostatic effect is subordinate.
  • Study on bending property of hydroxyapatite matrix compositions reinforced by modified carbon fibers
    LI Qiang;MU Bai-chun;YU Jing-yuan;SUN Xu-dong
    . 2013, 44(07): 940-943.
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    Carbon fibers were modified by in-situ synthesizing mullite protective layer and treating with p-aminobenzoic acid. The modified carbon fibers were composited with hydroxyapatite matrix and the new HA compositions were prepared. The effect of carbon fibers before and after modification on bending strength of HA compositions was studied and the reinforced mechanism was analyzed. The results show that with the increase of content of carbon fibers the bending strengths of the compositions first increase and then decrease. The bending strength comes to maximum at the content of carbon fiber of 3vol %. When the sintering temperature increases, the bending strengths of carbon fiber, modified carbon fiber and carbon fiber after duplicated surface modification all increase. Simultaneously the whole improved range of three type of compositions increases successively. When sintered at 1150℃, the bending strengths of the compositions come to maximum and is 55.13Mpa, 100.95Mpa, 112.17MP, respectively. The bending strength of hydroxyapatite matrix composites reinforced by carbon fibers after duplicated surface modification improve 3.5 time by HA maxtrix. The reason is that the surface of modified carbon fibers have in-situ synthesizing mullite protective layer and p-aminobenzoic acid has good compatibility and adsorbability about HA.
  • Preparation of load Fe0/MCM-22 and the removal of Pb(Ⅱ) from the water
    JIAO Chuang;CHENG Yue;HU Liang-feng;PAN Shun-long
    . 2013, 44(07): 944-948.
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    Fe0/MCM-22 was synthesized by using dipping method, ultrasonic oscillations method and aqueous reduction method. The Fe0/MCM-22 was characterized by using XRD and SEM. The removal efficiency of Pb(Ⅱ) by Fe0/MCM-22 was evaluated under different reaction conditions．Experiments exhibited that Fe0/ MCM-22 keeps slice structure as MCM-22 , the slices were got together that is compact and orderly. In addition, iron nanoparticles particles that have diameters of 50-80 nm was uniform distribution scattered and loaded on the slices , the particles wasn't aggregated. The high removal efficiency of Pb(Ⅱ) (92.52%) was obtained within 120 min for 140 mg/L of Pb(Ⅱ) at the optimal pH value of 7 and Fe0/MCM-22 dosage of 0.5 g/L at room temperature. The reaction process followed the pseudo-first order kinetics.
  • Studies of Adsorbent Preparation of Activated Carbon Loaded Silver for Removal of Benzothiophene
    WANG Guang-jian;ZHANG Jian-kang;YANG Zhi-jian;LIU Ying-huan
    . 2013, 44(07): 949-953.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Activated carbon (AC) Loaded silver as adsorbent was prepared using impregnation method to investigate its desulfurization performance for benzothiophene(BT) in model diesel. N2 adsorption、Scanning Electron Microscope (SEM)、Fourier Transform Infrared Spectroscopy (FTIR) and X-ray Diffraction (XRD) were adopted to characterize the prepared adsorbents. Surface acidic groups increased by HNO3 oxidation, which is conducive to the removal of weak alkaline BT. The adsorbent that AC modified with HNO3 as the carrier loaded AgCl has the highest desulfurization rate 91.8%. Finally, the adsorption behavior of AgNO3 on AC and metallic silver on the adsorption removal of BT were discussed.
  • Effect of Pulverized Coal on PVC Material Mechanical Properties
    CAO Xin-xin;LUO Si-hai;HE Xiao-fang;DAI Ya-hui
    . 2013, 44(07): 954-957.
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    The pulverized coal/PVC composite was prepared by adding pulverized coal into PVC, and the effects of pulverized coal’s content and distribution on mechanical properties of PVC were studied. The results show that pulverized coal (average particle diameter 34.5μm) can be distributed homogeneously in PVC plastic; when the pulverized coal amount to 7%of the composite, the PVC composite has the best mechanical properties, the tensile strength of PVC composite is 66Mpa, the yield strength is 68MPa, the elongation at break is 84%, the impact strength reaches to 16.46kJ/m2, and the shore hardness is 87.16. The main reason for this is that pulverized coal that are uniformly distributed assume the load transfer in the composite.
  • Preparation of Zn-TiO2 film on magnesium and its corrosion behavior
    GAO Jia-cheng;XIE Feng-yu;ZHANG ting;ZHANG Min
    . 2013, 44(07): 958-961.
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    Zn-TiO2 sol，prepared by sol-gel technique using titanium tetrachloride as precursor, deionized water as solvent and ZnCl2 as dopant, was coated on pure mag- nesium(Mg) by the method of spin-coating to improve the matrix corrosion resistance. The phases and microstructure of the coated-TiO2 magnesium at different experimental conditions were characterized using XRD, TG/DSC, SEM. It was found that Zn2+ inhibited the growth of grains and crystal transformation.The effects of the heat-treatment temperature, coating times and Zn2+ doping concentration on the corrosion resistance of the samples were investigated by the orthogonalizing analysis, where electrochemical impedance value was chosen as evaluation criteria. According to the results, the optimal synthesis route was 0.5% Zn2+ doping concentration, 3 coating times, and 300℃ heat-treatment temperature where TiO2-coated Mg had the best corrosion resistance.
  • Electrode of Chilli-peroxidase of Response to Phenol
    JIN Li-e;WANG Xiao-juan;WU Ai-lian;LI Hai-xia
    . 2013, 44(07): 962-965.
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    A novel peroxidase electrode for the determination of phenol was fabricated by chill-peroxidase (CH-POD) extracted from chill. carbon nanotubes (CNTs), microcrystalline cellulose (MC), N,N-dimethylformmide (DMF), and CH-POD were modified on the surface of the platinum (Pt). The profile of the peroxidase electrode, its the optimal condition of responsible to phenol and the stablity were observed by optical microscope and cyclic voltammetry (CV), respectively. Experimental results indicated that the electrode exhibited a good response to phenol. The optimal conditions of response were as following: 100μL chilli-peroxidase was used in 12ml reaction solution and pH was 7.0. With the scanning speed of 50mV/s the relationship between electric current and concentration of phenol can be described as: I( mA) = 0. 1429+ 0. 01297C. The linear response range was 2 -20 mmol/L with correlation coefficient of 0.996, detection limit was 0.25mmol/L. The experiment for the stability of the made electrode confirmed that the changing degree for the response signal was below 5% of the first signal when the electrode was intermittently used at 4℃ during placing period of 7 day. The concentration of phenol of samples in waste water from four different factories was both determined by the peroxidase electrode and spectrophotometry. It demonstrated that the relative deviation of two methods is in the range from -7.22% to 0.74%.
  • Research on electromagnetic shielding of expanded graphite/metal net/ABS electromagnetic shielding composites
    YANG Yu-shan;DONG Fa-qin;ZHENG Kai
    . 2013, 44(07): 966-969.
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    expanded graphite and metal net as unit for electromagnetic shielding was added to ABS resin, the electromagnetic shielding composites was prepared by blending, extrusion and injection molding process. The influence of of content of expanded graphite, composite material thickness and mesh number of metal net on shielding effectiveness of composites was studied. The results show that shielding effectiveness of composites gradually augmented with the increase of expanded graphite’s content and composite material thickness in expanded graphite/ABS electromagnetic shielding composites, and shielding effectiveness of composites was increased by added expanded graphite after ultrasonic treatmented. Shielding effectiveness didn’t increases with the increase of mesh number of metal net for metal net/ABS electromagnetic shielding composites. Shielding effectiveness is better added 200 mesh stainless steel and 100 mesh bronze for single layer metal net/ABS composites, the maximum Shielding effectiveness up to 76.1dB and 70dB in 30MHz～200MHz frequency range. Shielding effectiveness of expanded graphite/stainless steel net/ABS composites highed about 5dB than stainless steel net/ABS composites in multiphase electromagnetic shielding composites.
  • Morphology and mechanical properties of EVA/OSEP foamed materials
    DENG Fu-quan;MA Jian-zhong;XUE Chao-hua;DUAN Zhou-yang
    . 2013, 44(07): 970-973.
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    Sepiolite (SEP) was modified with dioctadecyl dimethyl ammonium chloride (DDAC) to obtain organophilic sepiolite (OSEP), and nanocomposite foams based on ethylene vinyl acetate copolymer (EVA) had been prepared by melt blending EVA with addition of OSEP. The clay interlayer spacing of SEP by DDAC was characterized by X-ray diffraction. The cell microstructure of EVA/OSEP foams was analyzed by scanning electron microscopy and the mechanical properties had been investigated. It had been shown that the clay interlayer spacing of SEP was increased after organic modification. The OSEP layer could be employed as a heterogeneous nucleation agent to improve the uniformity of cell structure of the foamed samples and the physical properties.
  • Synthesis of CdS-K2La2Ti3-xAgxO10 catalyst and its photocatalytic property
    LIANG Ying-hua;CUI Wen-quan;LIU Li;QI Yue-li
    . 2013, 44(07): 974-978.
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    K2La2Ti3-xAgxO10 powder was obtained by a stearic acid method. CdS-intercalated K2La2Ti3-xAgxO10 photocatalysts were synthesized via ion-exchange reaction, butylamine pillaring and sulfuration processes under the assistance of the microwave irradiation. The photocatalysts was determined by means of of powder X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray energy dispersive spectroscopy (EDS), ultraviolet-visible diffuse reflection spectra (UV-VIS), X-ray photoelectron spectroscopy (XPS), photoluminescence measurement (PL) and so on. The photocatalytic activities of these composite compounds for hydrogen production were also investigated under UV and visible light irradiation. The results revealed that the Ag irons doping and CdS-intercalated K2La2Ti3-xAgxO10 photocatalysts can widen the range of absorb visible light. The photocatalytic activities for hydrogen production of the CdS-intercalated K2La2Ti3-xAgxO10 photocatalyst were 226.30 mmol/(g cat) and 3.27 mmol/(g cat) under UV light and visible light irradiation, respectively, after 3 h irradiation. At last, the mechanism photocatalysis was deduced.
  • The Influence of zinc oxide and fillers on the properties of Aluminum-Chromium-Phosphate Matrix composite
    TIAN Shuai;HUO Ji-chuan;LEI Yong-lin;CHEN Ning
    . 2013, 44(07): 979-982.
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    High silica glass fiber/ Al-Cr-Phosphate (ACP) composites were prepared by a low temperature hardening process with Al2O3 and Cr2O3 as matrix material's fillers. The TG-DSC and XRD measurements were used to study the ACP properties. The effects of the composite fillings, nanofiller and hot pressing process on the mechanical properties of the composites were studied. Experimental results indicate that the zinc oxide can reduce the curing temperature of the ACP and to promote its crystal transformation；the composite fillers Cr2O3 and Al2O3 can improve the heat resistance of the material, when Cr2O3 and Al2O3 ratio is 7:3 and the amount of nano-Cr2O3 filler is 5%, the mechanical properties of the obtained composite are the best, of which the tensile strength is 95.2MPa and the flexural strength is 190.02MPa.
  • Effects of structure of PMMA-b-PS and nano-organic rectorite on the gel polymer electrolytes
    SONG Ying;MA Xiao-yan;TANG Lin;GUAN Xing-hua
    . 2013, 44(07): 983-987.
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    Polymethylmethacrylate (PMMA)-based gel polymer electrolytes (GPE) have excellent compatibility with electrodes and ion transport property, but the low thermal stability and mechanical strength are still open to improvement. Novel polymer matrixes was compounded and organic rectorite was added to enhance the properties of PMMA-based GPE, with block polymer PMMA-b-PS as the matrixes, propylene carbonate (PC) as the plasticizer and lithium perchlorate (LiClO4) as the electrolyte salt. Three kinds of block polymer, PMMA-b-1PS, PMMA-b-2PS and PMMA-b-3PS were synthesized by atom transfer radical polymerization(ATRP) with different mole ratio of MMA and St varying from 1:1 to 1:3. The ion conductivity of GPE membranes was characterized by AC impedance. It is found that all the three types of PMMA-b-PS based GPE have higher conductivity than PMMA-based GPE , in which PMMA-b-1PS based GPE is the best one with the ion conductivity of 5.99×10-5 S/cm. A series of PMMA-b-1PS based NGPE membranes were prepared. The microstructure of NGPE was characterized by X-Ray Diffraction (XRD). The results of AC impedance indicate that the conductivity of all NGPE are superior to the conductivity of PMMA-b-1PS based GPE without nano-organic rectorite. Typically, the conductivity of NGPE with 3wt% nano-organic rectorite is 3.11×10-4 S/cm at room temperature. TGA curves display that the thermal decomposition temperature of PMMA-b-1PS based GPE was 66.1 ℃ higher than PMMA based GPE when it lost 5% in weight, and the addition of nano-organic rectorite improve the thermal stability of PMMA-based GPE further.
  • Wear property of（ZrB2+Al3Zr）p/2124 composites synthesized by sonochemistry melt reaction
    JIAO Lei;ZHAO Yu-tao;WANG Tian-ping
    . 2013, 44(07): 988-992.
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    Ultrasonic field has a significant improvement on the microstructure, structure and properties of composite materials, in this article, our experiment is based on the Al-Zr-B reaction system under ultrasonic field, the in situ ZrB2+ Al3Zr particles-enforced 2124 aluminum-matrix composites are prepared via DMR direct melt reaction method. The morphology, distribution and size of the ZrB2 + Al3Zr particles in the ultrasonic field are studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The experimental results show that the binary particle-reinforced 2124 aluminum-matrix composites were successfully prepared via the DMR method, the reinforced particles are divided into ZrB2 and Al3Zr, and while the ultrasonic field was introduced into the system, particles were gradually dispersed and refined, especially in the 1.8kW ultrasonic field, the morphology of the reinforced particles translate from the original strip, reunion phase to diffuse granular. In addition, the improvement of wear properties is also discussed in this article.
  • Effect of Mn content on microstructure and damping capacity of Fe-Mn alloy
    SONG Shun-yuan;LI Ning;TENG Jin;YAN Jia-zhen
    . 2013, 44(07): 993-995.
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    Fe-Mn alloys were prepared by high frequency induction melting in a vacuum atmosphere. The damping capacity was measured using reversal torsion pendulum. the effect of Mn content on microstructure and damping capacity of Fe-Mn alloy was investigated , combining with SEM and TEM. . The results indicated that the damping capacity increased with increasing Mn content, attained a maximum at approximately 16.5%Mn, and then decreased with further Mn content. When Mn content is less than 16.5%,with Mn content increasing, the quantity of extended dislocation increased , and at the same time, the mobility increased with the quantity of α′martensite decreasing, which both leaded to increasing damping capacity. When Mn content is more than 16.5%,the damping capacity decreased for the quantity of extended dislocation decreaseing with increasing Mn content.
  • Synthesis and characterization of ZnO/CdO multilayer thin films
    ZHENG Bi-ju;HU Wen
    . 2013, 44(07): 996-1000.
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    ZnO/CdO composite films with different CdO content were obtained by pulse laser deposition technique. The structural, optical and electrical properties of the composite films were investigated by XRD, photoluminescence and electrical resistivity measurements, respectively. Results show that the UV emission was with constant peak position in their photoluminescence spectra. In meantime, their electrical resistivity decreased to very low level approaching to the value of CdO film, which can be explained by the Matthiessen composite rule for resistivity. The peculiarity of low resistivity and high transmittance in the visible region enables these films suitable for optoelectronic device fabrication.
    • 工艺 ·技术
  • Preparation and photocatalytic degradation properties of novel biommimetic photocatalyst Fe(Ш)-taPc/SiO2
    ZHANG Yu;ZHANG Rui-feng
    . 2013, 44(07): 1001-1005.
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    Fe(Ш)-taPc was loaded on new macroporous SiO2 materials via a simple immersing/solvent exchanging method, the obtained macroporous photo-catalysts can be recycling-usable with high catalytic activity. The catalysts were characterized by means of SEM, HRTEM, UV-Vis diffuse reflectance spectrometry and Raman spectrometry. The photocatalytic activity and circulating degradation rate of the photo-catalysts were determined by using rhodamine B as the objective substance. The results showed that the Fe(Ш)-taPc molecules dispersed very well on the wall of the SiO2 support due to an effective interaction between Fe(Ш)-taPc and the support. Rapid degradation of rhodamine B was observed under the radiation of visible light, the highest degradation rate is up to 97.4% within 60 min of reaction. The catalysts exhibited activities that changed very slightly during 6 times of cycling utilization.
  • The Characteristic of Wavelength-add-drop in 2D Terahertz Photonic Crystal Filter
    YANG Yuan-jiang;XIE Qiang;ZHANG Qing;LIU Jian-lin;LI Sheng;YANG Bang-chao
    . 2013, 44(07): 1006-1011.
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    Using the finite difference time domain method, the electromagnetic ?eld distribution of terahertz waves are simulated in different photonic band gap structures composed by one, two and three single-defect. The study showed the new phenomenon that L-type defects can drop three high-Q resonant frequencies in the monitor coordinates. So the single defect, double defects and L-shaped defects, respectively meet the requirements of single, double and triple frequency download-upload filtering
  • Deposition and photoelectric properties of ZnO:Nb transparent conducting thin films
    ZHOU Ai-ping;LIU Han-fa;ZANG Yong-li
    . 2013, 44(07): 1012-1014.
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    Niobium-doped zinc oxides transparent conducting films were deposited by DC magnetron sputtering on glass substrates. The effect of sputtering power on the structure, morphology and photoelectric properties of the films were investigated by X-ray diffraction, scanning electron microscopy(SEM) and transmission spectrum. The experimental results reveal that the NZO films possess a hexagonal wurtzite polycrystalline structure and the preferred orientation corresponds to the (002) peak. The resistivity decreases rapidly when the sputtering power increases from 40W to 80W. The resistivity tends to be stable when the power is over 80W. When the sputtering power is 100W, it is obtained that the lowest resistivity is 5.89×10-4Ω?cm and the largest optical band gap is 3.395eV. All the films present a high transmittance of above 86.6% in the wavelength range of the visible spectrum.
  • Effect of Mn-Zn Ferrite Synthesized by Different Method on Magnetic Glass-ceramics
    LI Guang-da;FENG Shu-ying;ZHAO San-tuan;LIANG Gao-feng;MA Kai-wang;DONG Kan-kan;XING Ya-dong
    . 2013, 44(07): 1015-1019.
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    In present research, Mn-Zn ferrite precursor was synthesized by sol-gel, cooperation and oxides calcining method, respectively. The effect of different Mn-Zn ferrite precursor on the magnetic property and bioactivity of magnetic bioactive glass-ceramics was studied. The results show that the doping ferrites result in a magnetic behavior of the composites. Under a magnetic field of 7.96×105A?m-1, the saturation magnetization of materials lies in the range 7.49-6.46 A?m2?Kg-1, and the coercive force lies in the range 9.95×103-1.60×104 A?m-1. The saturation magnetization and coercive force of the composite containing ferrite synthesized from cooperation are relatively high, and the hysteresis loop aera is the max. Thus this composite is expected to have the best heat generating ability. The doping ferrite leads to the decrease of bioactivity. But after soaking in simulated body fluid for 21 days, the surfaces of all composites are coated by an apatite like layer. After co-culturing with ROS17/2.8 cells for 7 days, material containing ferrite synthesized from cooperation shows good cell affinity.
  • Comparison of biocompatibility of electrochemical polished surface and anodic oxidized surface of TA4 pure titanium
    NIU Xiao-ya;XU Xiao-jing;SHENG Xin-lan;ZHANG Ti-feng;LIU Min;ZHU Li-hua
    . 2013, 44(07): 1020-1023.
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    The surface morphology, corrosion resistance, fretting friction and wear properties and bioactivity of electrochemical polished surface and anodic oxidized surface on TA4 pure titanium were investigated. The results show that compared to the anodic oxidized surface, the electrochemical polished surface has more nano-scale cavities (fewer total cavitities), lower surface rougness (about an order lower), lower corrosion resistance, lower friction coefficient (0.134 vs. 0.286), worse wear resistance, and higher bioactivity (growth rate of Ca-P layer in simulated body fluid).
  • Study On Magnetic/Active Carbon Composite Coating Modification for Porous Suspension Ceramsite
    XIA Guang-hua;ZHAO Xio-dong;LIAO Run-hua
    . 2013, 44(07): 1024-1028.
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    To enhance the adsorption performance of porous suspension ceramsite (psc) , this paper describes experiments in which Fe3O4 and activated carbon composite were coated onto the surface of porous suspension ceramsite, and this composite media was used for sorption experiment with methylene blue solution , conducted a study on the various process parameters , such as the impregnation ratio, carbonization temperature, the activation temperature , activation time , the magnetic powder added amount, the results show that: the optimum conditions for modification of porous suspension ceramsite are at a KOH/glucose ratio of 4, a carbonization temperature of 400 ℃, an activation temperature of 850℃ and a hold time of 2h, a magnetic powder dosage by 10%. The adsorption removal efficiency of methylene blue solution (1mg/L) by modified ceramsite reached 88.1%, wich is 3.15 times as unmodified ceramisite. The modification is very effective
  • Heredity characters of inclusions and electromagnetic properties of non-oriented silicon steel treated by rare earth alloy
    ZHANG Feng;LI Guang-qiang;ZHU Cheng-yi
    . 2013, 44(07): 1029-1033.
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  • Preparation and Characterization of Paraffin Microcapsules for Infrared Stealth
    LI Shao-bing;JIN Wen-bin;XU Liang;WANG Li-xi;ZHANG Qi-tu
    . 2013, 44(07): 1034-1038.
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    Abstract: Paraffin microcapsules were prepared by in-situ polymerization using paraffin and acrylic acid as raw materials. The phase compositions, morphologies, chemical structures and the particle diameter of the paraffin microcapsules were characterized by XRD, SEM，IR and laser particle analyzer. The results showed that the diameter of globular paraffin microcapsules was the smallest when the mass ratio of emulsifier and paraffin wax was 0.05:1 and the mass ratio of core to shell was 1:1 at the maxing speed of 320 r/min. The thermal properties of paraffin and paraffin microcapsules were tested by DSC. Their phase change temperature was about 65 degree, and the latent heat of phase transformation was about 132J/g. Those could indicate paraffin microcapsules retained the store hot performance of paraffin, and the requirement of high heat enthalpy for the infrared stealth was achieved. The prepared globular paraffin microcapsules materials provide a better temperature cont rol packing for infrared stealth coating.
  • Bond slip characteristics between artificial turf fiber and cement mortar
    QIU Hao-cheng;YI Hong-ling;FENG ZHong-jun;ZHENG Bai-cun
    . 2013, 44(07): 1039-1042.
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    Samples were cast in self-designed mold and then pullout tests were performed to understand the pullout behavior of artificial turf fibers from cement mortar. The effects of curing time, embedded lengths and cross sections of fibers on pullout load and interfacial bond strength were studied. The results indicated that the bond strength grows with the development of the curing days until the third day when it reaches a stable value; it declines slightly with the development of embedded length; bond between flake fiber and cement mortar is strongest while bond between reinforced fiber and cement mortar is weakest. In this study, a method to improve the bond strength by means of grafting acrylic acid with swelling was proposed. Meanwhile, the effects of chemical grafting and physical swelling on interfacial bond strength were also studied.
  • Surface Photovoltage Spectroscopy of Ag-Modified Composite TiO2 Nanotubes
    LI Jing-ling;CHEN Wen-zhe;YU Hua-liang;WU Bo;LIN Wei;ZHUANG Qiong-yang;ZHANG Shao-jin
    . 2013, 44(07): 1043-1047.
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    Ag-modified, composite TiO2 nanotubes were synthesized using molten alkali-hydrothermal method under an atmospheric pressure. The organization and morphology of the composite TiO2 nanotubes were characterized. Nanotubes have clear, uniform and neat morphology with diameter of around 3 to 5 nm, each nanotube composed of 3 to 5 layers and wall thickness of around 0.5 nm. In particular, TiO2 and Ag nanoparticles clearly adhere in between nanotubes and at the exterior surface of nanotubes. XRD results display that, the composite TiO2 nanotubes from the single anatase phase to the anatase and rutile mixed phase. SPS (Surface Photovoltage Spectroscopy)and FISPS (Electric Field-induced Surface Photovoltage Spectroscopy) demonstrate the bound exciton sub-band-gap transition characteristics from its asymmetric changes corresponding to changes in polarity and strength of the external electric field. The band-band transition occurs within a wavelength span of 350 nm. Ag modifing has imposed considerable influence on both the photovoltaic response of composite TiO2 nanotubes and the separation of photoinduced electrons and holes at the surface of nanotubes.
  • Preparation and Performance Analysis of Rice-Straw Particleboard Overlaid with Sliced Bamboo Veneer
    REN Li-min;WANG Feng-hu;ZHANG Li
    . 2013, 44(07): 1048-1052.
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    The rice-straw particleboard overlaid with sliced bamboo veneer was manufactured with PVAc, and the physical and mechanical properties were studied. The results showed that the MOR and MOE of the overlaid particleboard were excellent, and the surface bonding strength was good. The particleboard could have warm water resistant and not have hot water resistant. The micro-morphology of overlaid particleboard was observed by SEM, and the FTIR of materials was analyzed. The micro-cracks and hydrophilic groups made the particleboard lost bonding property under the condition of high temperature and humidity. The overlaid particleboard has the bamboo’s beautiful color and texture, and also has the excellent physical and mechanical properties of rice-straw particleboard, so it can be widely used as interior decoration material and non-load-bearing packaging material.
  • Sdudy of PCT And Kinetic properties for LaNi4.7Al0.3 hydrogen storage alloy
    MA Jin-cheng;ZHANG Zao-xiao;WANG Yu-qi;WU Zhen;YAO Rui-qing;CAO Jian-dang
    . 2013, 44(07): 1053-1800.
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    Abstract: The PCT properties and hydriding/dehydriding kinetics were simulated for LaNi4.7Al0.3 under quasi-isothermal and variable pressure conditions. An ideal kinetic expression for the hydriding/dehydriding reaction is an important tool in the designing process of reaction unit. This paper is based on PCT polynomial equation and nucleation and growth model, and appropriate model equations were obtained for hydriding/dehydriding reaction of LaNi4.7Al0.3 hydrogen storage alloy. There is a large slope in the PCT plateau of the alloy. The plateau is divided into three regions according to hydrogen content of hydriding/dehydriding, and enthalpy and entropy values are calculated for each regions using Van’t Hoff equation. The results show that the activation energy value was Ea=32kJ/mol, and the Avrami index n are within the narrow range of 1.1–1.33 in the model equation. The theoretical curves and the experimental data show a good agreement. The mechanism of hydriding/dehydriding changes from one-dimensional nucleation and growth in the prior period to lower diffusion in the later period for controlling reaction process.
  • Preparation of amorphous alloy atomization process numerical simulation and the formulation of process parameters by bar plasma spray
    FENG La-jun;WANG Guan-chong;YAN Ai-jun
    . 2013, 44(07): 1059-1062.
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    In accordance with past achievement in one-dimensional stable fluid dynamic by flame spray, an atomization mechanism has been provided in preparation of amorphous coating by bar material plasma spraying. It is found that the measured particle median diameter agree well with those obtained by numerical simulation. It shows that the mechanism of atomization is feasible by bar material plasma spaying. Two main process parameters are optimized to produce ferrous amorphous coating; the parameters includes primary gas pressure and secondary gas pressure. The results show that it can be obtained amorphous coating with φ3mm crystal bar Fe80P13C7 and Fe72Cr8P13C7 . The spray coating process parameters are as follows: spraying electric voltage of 55V,spraying electric current of 600A,distance between nozzle and bar of 4mm,bar velocity of 50mm/min,spraying distance of 100mm,spraying angle about of 90 degree,primary gas pressure of 0.85MPa and secondary gas pressure of 0.32MPa.
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