29 June 2013, Volume 44 Issue S1
    

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    综述·进展
  • Research in Chiral Absorbing Materials
    ZHAO Jing;LIN Yi;XU Rong-zhen;LIU Chong-bo;KUANG Yuan-ying;YANG Ying
    . 2013, 44(S1): 1-4.
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    Chiral absorbing material is one of the most promising absorbing materials in recent years, owning rich excellent character such as adjustable chiral parameter, wide absorbing band, excellent microwave absorbing properties, etc. With the help of adjusting chiral parameters, the material can obtain necessary wave-absorbing effect, which makes material production more targeted. In this paper, the absorbing mechanism of chiral absorbing materials is discussed, the research progress of three common chiral absorbing materials: metallic chiral microbody, microcoiled carbon fibers and chiral conductive polymers are summarized, and the further prospects are elaborated.
  • Progress in supported catalyst study for the copolymerization of carbon dioxide with epoxides
    LI Xin-bao;GU Wei;CAO Yong
    . 2013, 44(S1): 5-10.
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  • Progress in Supported Catalyst Study for the Copolymerization of Carbon Dioxide with Epoxides
    MU Jia-li;FAN Wen-jun;SHAN Shao-yun;JIANG Li-hong;WANG Ya-ming;JIA Qing-ming
    . 2013, 44(S1): 11-14.
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    Abstract: Aliphatic polycarbonates made from carbon dioxide and epoxides are biodegrable polymeric materials, which is to develop environment-friendly materials with a bright prospect. Supporting catalyst strategy is a good choice to achieve catalyst recycles use. The paper gives an overview the recent progress in research of supported catalysts for such a copolymerization process. Focus on the drawbacks and advantages of various immobilization approaches, these systems include ZnEt2 systems, carboxylic Znic, metal-salen complexes, bimetallic catalysts, so forth. Provide guidance on the supported catalysts for the further study.
  • Research Progress in Heat Dissipation Technology and Materials Used for High-power LED Devices
    CHEN Hai-lu;HU Shu-chun;WANG Nan;LIN Zhi-jian;XIA Gen-pei;LIU Wen-feng;REN Kai-xuan;JI Lei;SHAN Chun-feng
    . 2013, 44(S1): 15-20.
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    As the power increases, LED (Light Emitting Diode) devices appear much higher junction temperature. Furthermore, the reliability and working life will both be obviously reduced with the increase of junction temperature. So, heat dissipation technology and materials with high efficiency, low cost and high reliability are very important to design and prepare high-power LED devices. The progress of the heat dissipation technology and materials in the area of high-power LED device is reviewed in this paper from the following three aspects, design method of chip structure, auxiliary heat dissipation technologies and devices, and a series of heat dissipation materials used in the encapsulation area of LED devices.
  • Progresses in Development of Apatite-type Lanthanum Silicate-Based Oxide Ion Conductors
    HAN Bing-xu;WANG Ling;DAI Lei;LI Yue-hua
    . 2013, 44(S1): 21-27.
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    Apatite-type lanthanum silicate is a new type of oxide ion conductor with low activation energy and high oxygen ionic conductivity. In this paper, the crystal structure, conduction mechanism, synthesis methods and the state of the art in the research of lanthanum silicate-based oxide ion conductors are reviewed. Furthermore, the influence of various doped on oxide conductivity performance is generalized. The application of the oxide ion conductors in solid oxide fuel cell and gas sensors and so on are summarized. The development perspective in lanthanum silicate electrolyte are displayed.
  • Development of high-temperature lead-free solder in electronic micro-connection
    GAN Gui-sheng;DU Chang-hua;GAN Shu-de
    . 2013, 44(S1): 28-35.
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  • The Present Situation and Prospect of Stealthy Coatings
    LI Hai-yan;ZHANG Shi-zhen;SUN Chun-long;GUAN Ying-dong
    . 2013, 44(S1): 36-40.
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    The present situation of stealthy coatings is summarized in this paper. Kind of stealthy coatings is introduced, including radar absorbing coatings, infrared stealthy coatings, visible light stealth coatings, laser stealth coatings, etc. Principle, binder and pigment of stealthy coatings are introduced, too. Further more, the prospect of stealthy coatings is presented．
    • 研究·开发
  • The research of structure and biocompatibility of amorphous alloy Ti60Zr10Fe5Si9Nb5Mo11(at.%) with amorphous-nanocrystalloid configuration
    BAI Ling;ZHANG Hai-ying;CUI Chun-xiang
    . 2013, 44(S1): 41-43.
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    Abstract: As-quenched alloy Ti60Zr10Fe5Si9Nb5Mo11(at.%) is fabricated by a single roller spun-melt technique. The morphology and structure are investigated respectively by using high-resolution transmission electron microscopy, and X-ray diffraction analysismethods. The results show that the grain boundaries of alloy Ti60Zr10Fe5Si9Nb5Mo11(at.%) are dark. Some nanoparticles of Beta Ti and Ti5Si3 are distributed along alloy’s grain boundaries. The alloys is cultivated in the simulate body fluid (SBF) for 8 days and the experiment result shows that Ca phosphates depositions on alloys surfaces were gained. Moreover, n (Ca)/n (P) atom ratio of the deposition is about 1.34/1, which approach to that of human bone – 1.66/1, suggesting that the alloy is with an excellent bioactivity and biocompatibility.
  • Characterization of precipitates in CdZnTe single crystals
    SHENG Feng-feng;YANG Jian-rong
    . 2013, 44(S1): 44-47.
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    The morphologies of Te-rich and Cd-rich precipitates in CdZnTe single crystals were investigated by IR microscopy. The voids inside the Te-rich precipitates with tetrahedron or octahedron structures were confirmed. The results show that the surfaces of the matrix surrounding the precipitates with tetrahedron structure are (1 1 1) B surfaces. Other 4 surfaces of the matrix surrounding the precipitates with octahedron structure are (1 1 1) A surfaces. This means that the (1 1 1) B surface has the lowest surface energy density. It was also found that the Cd-rich precipitate with a shape of 6-pointed star under the IR transmission microscope is composed of the core of Cd-rich precipitate and some circumjacent regions with high dislocation density. The core of Cd-rich precipitate has usually an irregular shapes and the regions with high dislocation density extent from the core to outside along <2 1 1 > orientation. The size of the regions with high dislocation density is usually several times larger than that of the core. The action of the core of Cd-rich precipitate on the circumjacent matrix is also discussed in this paper.
  • Microwave Synthesis of Zn1-xCdxTe Ternary Quantum Dots and Its Biocompatibility Studies
    WANG Yu-peng;DU Jie;WANG Sheng-jiang;WU Yong-zhong;XU Cheng-wei;HAO Xiao-peng
    . 2013, 44(S1): 48-52.
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    GSH-stabilized high-luminescent Zn1-xCdxTe quantum dots (QDs) were prepared by microwave irradiation method in aqueous phase presented. The obtained ternary QDs were characterized by X-ray diffraction pattern (XRD), high resolution transmission electron microscopy (HRTEM), UV-vis absorption and photoluminescence (PL) spectra. The effects of reaction time, Cd2+/Zn2+ feed ratio, reaction temperature, pH of the precursor solution on the PL properties of ternary QDs were investigated in the present work. The MTT assay method was used to evaluate the cytotoxicity of GSH-Zn1-xCdxTe ternary QDs. Furthermore, the obtained ternary QDs were conjugated with β-actin antibody as fluorescence probes for cellular labeling.
  • Functionalization of self-assembled monolayers based on 1-pyrenebutyric acid and sensing performance to oxygen
    GAO Bo;YAN Hua;WANG Xue-mei
    . 2013, 44(S1): 53-57.
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    1-pyrenebutyric acid was fabricated on a glass wafer via SAMs（self-assembled monolayers）manner，prepared as a fluorescent sensing film. The film was characteristiced by XPS、wettability studies and fluorescence measurements. The fluorescence spectra accepted from different conditions showed that the intensity of fluorescence in hydronitrogen is stronger than in oxygen，and the results of fluorescence quenching by oxygen showed that the film is more sensitive in toluene，chloroform and dichloromethane.
  • Preparatiom and performances studies of sulfonated polysulfone membrane material
    HUANG Fu Feng-yun;WANG Bing;SHAN Juan-juan;KONG Yuan-yuan;SHAN Yong-guang
    . 2013, 44(S1): 58-62.
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    Sulfonated polysulfone is a excellent material for the preparation of hydrophilic membrane. In this paper sulfonated monomers 3,3’-disulfonated- 4,4’-dichlo- rodiphenyl sulfone (SDCDPS) was firstly prepared using 4,4’-dischlorodiphenyl sulfone (DCDPS) as raw material, and the best sulphonated conditions was determined. The molar ratio of SO3/DCDPS was 3.5, reaction temperature 110 °C and reaction time 20 h. A series of different sulfonation degree of sulfonated polysulfone membrane material were synthesized via nucleophilic polycondensation reaction using SDCDPS as monomer. Its structure had been characterized by Infrared spectroscopy and nuclear magnetic resonance spectroscopy. The thermal analysis experiments showed that the polymer material had a higher molecular weight and thermal stability.
  • Study on the Selective Adsorption of Low-Molecular Aldehydes and Ketones from Cigarette Smoke Using Mesoporous Alumina
    FENG Shou-ai;HUANG Tai-song;ZOU Ke-xing;LI Zhi-hua;ZHOU Jun;WEI Kang;BAI Jia-feng
    . 2013, 44(S1): 63-66.
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    To eliminate the low-molecular aldehydes and ketones in mainstream cigarette smoke and study the effect of mesoporous alumina on the adsorption of harmful components from smoke, mesoporous alumina particles with different microstructure was separately introduced into filter tip and the corresponding influences on the content of the low-molecular aldehydes and ketones in mainstream cigarette smoke were studied. The results showed that mesoporous alumina could effectively eliminate the low-molecular aldehydes and ketones from the mainstream cigarette smoke and the elimination efficiency was closely associated with the pore size of mesoporous alumina. The further study on the adsorption of phenol and benzopyrene from cigarette smoke using mesoporous alumina revealed that the preferential adsorption of low-molecular aldehydes and ketones was associated with the selective adsorption of polar molecules on mesoporous alumina and the low melting and boiling points of these aldehydes and ketones. In summary, the commendable adsorption performance of mesoporous alumina should be related to its abundant mesoporous structure, the electrostatic attraction on the interface, nanometer pore space confinement and the low melting and boiling points of low-molecular aldehydes and ketones. The analysis result about the three indicators of mainstream cigarette smoke showed that mesoporous alumina had no obvious influence on the content of Tar and nicotine in smoke.
  • The influence of He ion irradiation on the surface hardness of amorphous hydrocarbon film
    SUN Li;FAN Hong-yu;LI Meng-ke;LIU Dong-ping;YANG De-ming;YANG Qi;NIU Jin-hai
    . 2013, 44(S1): 67-70.
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    Abstract： Amorphous hydrocarbon films were prepared on Si substrates by plasma enhanced chemical vapor deposition at room temperature. Then they were irradiated by 100 keV He+ with the dose of 1.0×1015 ions/cm2、5.0×1015 ions/cm2、5.0×1016 ions/cm2 and1.0×1017 ions/cm2. The surface mechanical properties of as-deposited and He ion irradiated hydrocarbon films were analyzed by using atomic force microscopy AFM-based nanoindentation and scratching tests.Their chemical compositions and structural properties were evaluated by FTIR and Raman measurements. Analysis showed that the decreased content of bonded H atoms and increased fraction of sp2 C clusters after He ion irradiated samples may play a great role on the increase of the nanohardness.
  • Influence of Working Gap on Magneto-Rheological Coupler
    LU Guang-tao;LI You-rong;SONG Gang-bing
    . 2013, 44(S1): 71-74.
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    This paper studies the influence of working gap on the magnitude and distribution of the magnetic field density and the shear stress of a magneto-rheological coupler. The results of FEA and experiments indicate that the magnitude of the magnetic field density decreases with the increase of the working gap, while the distribution of the magnetic field density and the shear stress becomes more uniform along the axial direction. Because of the magnetic saturation and the existence of the stress yield of the Magneto-Rheological Fluid, the working gap, for the range of 0.2mm to 1.2mm, has limited influence on the magnetic flux density and the stress. The further computational results show that the transmission torque only decreases 25% in this procedure. Base on these findings, the working gap should be chose properly to get a sufficient magnetic field and transmission torque for a given device with consideration of machining and assembling cost associated with a smaller working gap.
  • Suppression Effect of Laminated Floropolymer Electret Films on Escherichia Coli Growth
    FANG Zhou;GUO Jie;ZHANG Xiao-qing
    . 2013, 44(S1): 75-78.
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    In this paper, we report the preparation and charge storage stability of laminated porous polytetrafluoroethylene (PTFE) and fluoroethylenepropylene (FEP) electret films, made by using rolling technology, and their influence on the growth of Escherichia coli. The charge storage stability in such laminated PTFE/FEP films was characterized by the measurements of isothermal surface potential decay and thermally stimulated discharge (TSD) current spectrum. The results show that for the laminated PTFE/FEP films, with same porosity PTFE layer, the charge stability increases with the increase of the film thickness. 47% of total charges remain in deeper charge traps after the TSD experiment. For the laminated PTFE/FEP films with same thickness but different PTFE layers, the samples with larger porosity PTFE layers show enhanced charge stability. This could be due to the increased drifting paths of detrapped charges in such films. By exposing the Escherichia coli samples to the laminated PTFE/FEP electrets films for 48h, it is found that the antibacterial rate is around 94%.
  • Influence of Heat Treatment on Intergranular Corrosion and Mechanical Property of 5083 Aluminum Alloy
    LI Chun-hong;LI Chun-mei
    . 2013, 44(S1): 79-81.
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  • The influence of Microemulsion on Solubilization of Iodine Green
    ZHANG Ying-qi;GAO Lei;GAO Rui-fang
    . 2013, 44(S1): 82-84.
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  • The effect of adding phenolic resin on properties of carbon cloth
    LI Ya-dong;ZHANG Xue-jun;TIAN Yan-hong;XU Xiao;WANG Su-qing;LI Jin-liang
    . 2013, 44(S1): 85-88.
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    Carbon cloth for fuel cell diffusion layer material was prepared from carbonized artificial cotton cloth impregnated with diammonium phosphate as substrate and phenolic resin as reinforcing material. The influence of phenolic resin content on strength, resistivity, thickness and density of the carbon cloth was studied, and the mechanism was discussed on the basis of microstructure of carbon cloth deduced from XRD spectra and SEM images. The results show that the phenolic resin could increase the strength of carbon cloth and decrease the resistivity. When the content of phenolic resin was 54%, the strength of carbon cloth increased by 39.5%, and the bulk resistivity decreased to 0.06Ω?cm.
  • Study on the Effect of Sintering Temperature on the Quality of Sludge Ceramsite
    LIN Zi-zeng;HUANG Ying;XIE Wen-li
    . 2013, 44(S1): 89-93.
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    This study aims to find out suitable temperature for sintering process during sludge ceramisite production. Experiments at different temperatures have been done to investigate the sintering effects. As one of the control parameters, the result showed the refractoriness could be taken as the initial temperature when mixture starts forming.Pore size distribution of the ceramisite presented a single-peak curve under 1000℃ while a double-peak curve could be observed between 1050℃-1100℃. The effects sintering process had on ceramisite pore size distribution were as belows: the raise of temperature brought bigger peak pore size and the longer sintering time brought more peak pore size distribution. XRD analysis showed the crystal phase of ceramisite were mainly quartz and kyanite, and the presentation of a double-peak curve above 1050 ℃ may be due to iron oxide decomposition.
  • Microstructure and Property of Laser Metal Deposition Ti-matrix Gradient Wear-Resistant Coating
    QIN Lan-yun;WANG Wei;YANG Guang;BIAN Hong-you
    . 2013, 44(S1): 94-97.
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    To improve the wear-resistance of Ti6Al4V at high temperature, Ti-matrix gradient coating on Ti6Al4V substrate was deposited by Laser Metal Deposition(LMD)process.The microstructure was investigated and its microhardness and friction wear properties of the coating and substrate were examined at 500℃. The results show that the in-situ TiC reinforced phase distributes on deposition layers evenly in the form of big dendrite、large graininess and little graininess structure along the gradient direction.Microhardness analysis indicates that the hardness shows gradient ascent from the substrate to the surface. The coating has good wear-resisting property at high temperature and the wear volume ratio between the substrate and coating is 2.86.The increase of microhardness and good wear-resisting property is due to the small grain size and dispersion strengthening.
  • Influence of current density on microstructure and magnetic property of electrodeposited Sm-Fe alloy film
    KOU Ying;ZHANG Wei-qiang;LOU Chang-sheng;LV Xiao
    . 2013, 44(S1): 98-101.
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    Sm-Fe alloy films were prepared by galvanostatic electrodeposition method in aqueous solution. The influence of current density on microstructure, phase composition and chemical constituents of obtained films were investigated, and the magnetic property of Sm-Fe alloy film was measured. The experimental results show that the silver gray Sm-Fe alloy film is composed of Sm, Fe and small content of O. The Samarium content in film increased firstly and then decreased with increasing of the current density. With the increase of Samarium content, the films grow more dense and smooth, and the surface roughness reduces. The phase composition of Sm-Fe alloy film contains Fe12Sm and Sm3Fe5O12, the density changed the phase composition and then affected magnetic property of obtained films.
  • Effect of Al on the corrosion resistance of Mn-Cu damping alloy
    ZHANG Ying;LI Ning;YAN Jia-zhen;FU Xu
    . 2013, 44(S1): 102-104.
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    Corrosion behavior of Mn-Cu damping alloy with different Al addition in 0.5% NaCl solution was studied by dry-wet cycle test and electrochemical method. Mechanism of Al on the corrosion resistance was analyzed by SEM, EDS and XRD. Results show that , with the increase of Al content, the self-corrosion potential (Ecorr) increased and the corrosion current density (Icorr) declined; on the other hand, in the Mn-Cu alloys with Al addition, a film of Cu2O、Mn3O4、Mn2O3 and Al2O3 was formed. Those corrosion products played synergetic effect to make the film fine, thus inhabiting the diffusion of Cl- into interior and decreasing the corrosion speed.
  • The influence of doped Mg2+ SrTiO3 film photoelectric properties
    LIU Xue-ting;HE Chong-bin;XU Yi-rong;JIAO Long-long
    . 2013, 44(S1): 105-107.
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    The different content of Mg ion doping SrTiO3 thin film ceramic wafer was prepared by Sol-gel on the Al2O3, Mg in SrTiO3 replace titanium, forming an acceptor doping. This paper studied the influence of different content doping on the film's resistively, show that, when the doping concentration was 4%, resistively minimum. Also studied doping concentration was 4%, film resistively with the optical power change, show that, when the light power is less than 100w, resistively decreases rapidly, more than 100w, reduced smaller amplitude.
  • Preparation and Discharge Performance of CoS2 Cathode Material for Thermal Battery
    ZHAO Ping;LV Kun;YANG Shao-hua;GAO Hong
    . 2013, 44(S1): 108-111.
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    CoS2 with different morphologies were synthesized by hydrothermal process under different pH value conditions employing ethylenediaminetetraacetic acid disodium (EDTA-2Na) as chelating agent. The as-prepared products were characterized by XRD, SEM, laser particle size analyzer and used as cathode material in thermal battery single model cells. The results show that the morphology of the products could be changed by the pH values of solutions employed. The CoS2 with hollow sphere-like morphology are obtained in acid environment (pH =1, 4). The block samples with many nanoparticles on the surface can be obtained in neutral environment (pH=7). The flake-like samples are obtained in alkaline environment (pH =9, 11). With the increase of pH values, the particle size of CoS2 decreases gradually, the discharge platform voltage of single cells raises and the resistance of cells decrease gradually.
  • The radiation polymerization method for preparing baicalein molecularly imprinted polymer
    LIU Wei;WEI Jun-fu;WANG Bin
    . 2013, 44(S1): 112-115.
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    • 工艺 ·技术
  • Photoluminescence properties of spherical YAG: Ce powders via mechanochemical-spray-drying method
    HAN Tao;PENG Ling-ling;TU Ming-jing;ZHU Da-chuan
    . 2013, 44(S1): 116-119.
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    In this paper, spherical YAG:Ce powders were prepared by mechanochemistry-spray-drying method. The influences of calcinating temperature, suspension concentration and Ce3+-doped amount on the morphology, particle size and luminescence property of as-prepared YAG:Ce powder were investigated by means of XRD, SEM and spectra of fluorescence. The results show the precursors are spherical with the particle size of 2 ~ 10 μm, which are calcinated at 1300 ℃, and will be transmogrified from hair-ball shape to rice-ball shape. When the calcinating temperature is above 900 ℃, the single YAG phase occurs and the grain size increases with increasing the temperature. The particle size of powders increases, the corresponding luminescence property first increases and then decreases with the increase of suspension concentration, and 0.2 mol/L is the optimum concentration, due to the different optical properties of powders. The luminescence intensity of powders first increase and then decreases with increasing the Ce3+-doped amount (x), and the optimum x is 0.06. The emission wavelength of powders first red-shifts, then blue-shifts with increasing the Ce3+-doped amount, and the maximum red-shift appears when x is 0.1. Owing to the interaction of electric multipole, Ce3+ concentration quenching effect is produced, and the critical distance (Rc) is about 1.9 nm.
  • Effects of structural features of titania nanotube on its photoelectrocatalytic performance
    LI Yun-lin;ZHANG Chao;YANG Jie;ZHOU Ming-hua
    . 2013, 44(S1): 120-125.
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    The effect of structural features of titania nanotube arrays fabricated by anodization under different anodizing voltages and anodizing times on its photoelectrocatalytic performance was investigated. Characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, the photoelectrochemical properties, the photoelectrocatalytic activity of titania nanotube arrays with different nanostructure features, the reaction kinetics performance of its for the degradation of methyl orange were investigated. These results demonstrated that the aspect ratio of titania nanotube arrays has a maximum impact on its photoelectrocatalytic performance. The nanotube length and diameter of titania nanotubes increased with the increase of anodizing voltage and anodizing time, and the wall thickness of titania nanotube decreased with the increase of anodizing voltage. Titania nanotube with tube length of 25.85μm, wall thickness of 10.23nm, roughness factor of 175 and aspect ratio of 178 fabricated at 60V for 6h possessed the maximum photocurrent density of 48×10-3mA/cm2, and the maximum first order reaction kinetic constant of degradation of methyl orange was 2.26×10-3 min-1
  • Preparation of mesoporous silica using a rosin-based bis-quaternary ammonium salt and CTAB as the blend template
    HAN Shi-yan;LI Shu-jun;WANG Wei;SONG Zhan-qian
    . 2013, 44(S1): 126-129.
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    Using a mixture of a rosin-based bis-quaternary ammonium salt and CTAB as a template and tetraethyl orthosilicate as silica source, four kinds of silica materials SiA, SiB, SiC and SiD were prepared based on the alkaline hydrolysis with different proportion of the two surfactants. Their calcination temperature was 550oC, which was determined by TGA. SEM observation showed that SiC and SiD were more homogeneous-dispersed spheroidal particles without agglomeration than SiA and SiB were. According to TEM photographs, SiC and SiD were spheroidal particles with mesoporous structure. FTIR spectrogram identified the structure of SiC and SiD before and after calcination. Nitrogen adsorption-desorption analysis showed that the pore sizes of SiC and SiD were mainly at 3.8nm, surface areas and cumulative pore volumes of SiC and SiD were 685.29 m2/g, 1.22 cm3/g and 609.73 m2/g, 0.93 cm3/g, respectively.
  • Synthesis Of a Novel Two-photon Polymerization Initiator With Diethylaminophenyl Tri-substituted Structure
    SUN Mei;ZHOU Hai-ou;HU Han-mei;YANG Ming-di;TIAN Yu-peng
    . 2013, 44(S1): 130-133.
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    A novel two-photon polymerization initiator with tri-substituted structure 1,3,5-Tris[4-(N,N-Diethylamino)phenyl]ethenyl]phenyl]benzene was synthesized．The structure of the compound had been characterized by elemental analysis， electron-spray mass spectra， 1H NMR， and IR spectra. Uv.Vis absorption，one-photon induced fluorescence and two-photon induced fluorescence were experimentally studied. The two-photon absorption cross-section is as high as 987?10?50cm4 ?s? photon?1. A pulse duration of 200 fs and repetition rate of 76 MHz, mode-locked Ti: sapphire laser was used for two-photon microfabrication. Some three dimensional lattices were created by two-photon polymerization of an acrylic eater oligomer using this initiator. The lattice fabricated was observed through a polarization microscope (Olympus, BX-51). It is a potential TPA material.
  • Manufacture Reason Analysis on Laminated Fracture under Tensile Test of DH36 Hull Plate
    LI Hong-liang;GUO Hong-liang;ZHANG Shi-qing;ZHANG Xin;DU Guang-wei
    . 2013, 44(S1): 134-137.
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    ABSTRACT For analyzing the reason of unqualified mechanical property of DH36 hull plate produced by Jingye Cut Deal Co., the results showed that the main reason was the microcrack induced by aggregation of MnS, Nitrides and carbides as well as the martensite and bainite in the center of plate. Measures to reasonably design the chemical composition and improve steelmaking and rolling processes have been taken, as a result, the mechanical property improved greatly, and has been approved by seven classification societies.
  • Effects of Dolomite Additive on Bauxite-based Fracturing Proppant: Phase Composition, Microstructure, Performance
    LIU Jun;GAO Feng;WU Yao-peng;WANG Kun;HE Hong-wei;KANG Li-tao;LIANG Wei
    . 2013, 44(S1): 138-141.
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    High-strength fracturing proppant was prepared from bauxite (67 wt% Al2O3) and dolomite. The mirco-mechnism related with the strength improvement was addressed with systematic sintering experiments as well as phase composition/microstructure characterization. The results indicate that the addition of dolomite promotes the formation of liquid phase during sintering process. Liquid phase of samples plays three rules during sintering process: (1) depressing the sintering temperature; (2) facilitating the growth of rod-like mullite; (3) filling pores/bonding particles. Analyses suggest that the mechanical strength enhancement is introduced by the appearance of the interlocked rod-like mullite and the cross-linkage of particles by the liquid phase. The best performance of our proppant was achieved by 3wt% dolomite addition; the proppant exhibits a breakage ratio of less than 6 % (69 MPa) with a 1290 ℃ to 1400 ℃ sintering process, and this breakage ratio was depressed down to 2.9 % with a sintering temperature of 1350 ℃. The bulk density and apparent density of the 1350 ℃ sintered proppant are 1.75g/cm3 and 3.12g/cm3, respectively.
  • Florescence Emission Character of Polymer-Rare Earth Ion Complex Formed by Naphthoic Acid-Functionalized Polysulsone and Eu(Ⅲ)
    WANG Ming-juan;GAO Bao-jiao;DU Jun-mei
    . 2013, 44(S1): 142-148.
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    Naphthoic acid (NA) ligand was attached on the side chains of polysulfone (PSF) by using the polymer reaction method, obtaining naphthoic acid-functionalized polysulfone PSFNA. The luminous secondary polymer-rare earth complex PSF-(NA)3-Eu(Ⅲ) and the ternary complexes PSF-(NA)3-Eu(Ⅲ)-(Phen)1 and PSF-(NA)3-Eu(Ⅲ)-(Bipy)1 were prepared by the coordination of Eu(Ⅲ) ion with PSFNA as a macromolecular ligand and small molecular phenanthroline (Phen), respectively. The complexes were characterized by FTIR and UV absorption spectra, and the relationship between their florescence emission properties and chemical structures was investigated in depth. The corresponding experimental results were explained from the view of micro-mechanism with Antenna effect theory. The experimental results show that all of the secondary and ternary complexes formed by the coordination of PSFNA and Eu(Ⅲ) ion can emit the strong characteristic fluorescence of Eu(Ⅲ) ion, suggesting that the NA ligand bonded on the side chains of PSFNA can effectively sensitized the fluorescence emission of Eu(Ⅲ) ion. The NA ligand bonded on the side chains of PSFNA has no sensibilization for the fluorescence emission of Tb(Ⅲ) ion, in contrast, a energy back transfer from the excited state of Tb(Ⅲ) ion to the triplet state of the NA ligand will occur. The florescence emission intensity of the ternary complex is stronger than that of the secondary complex owing to the synergism coordination effect of the first and second ligands.
  • Fabrication of N-dope carbon aerogel electrodes and their structure characterization
    CHANG LI-juan;FU Zhi-bing;YUAN Lei;WEI Jian-jun;LIU Xi-chuan;TANG Yong-jian;WANG Chao-yang
    . 2013, 44(S1): 149-152.
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    Abstract: Activated N-doped carbon aerogel (N-ACA) is synthesized via sol-gel polycondensation and the melamine is employed as N-containing precursor followed by pyrolysis under Ar flow, then the carbonized derivative is activated in CO2 atmosphere. The surface morphology and porous texture structure are analyzed by using scanning electron microscopy(SEM) and N2 adsorption at 77K, It reveals that the skeleton framework of N-ACA has much change comparable to N-CA and the specific surface area is up to 4082 m2g-1. The burn-off degree of N-CA in CO2 atmosphere is investigated by Thermogravimetric analysis(TG). The results are the reaction between CO2 molecule and N-CA occurs at about 650℃, the rate of weight loss reaches a maximum at 1150℃, the suitable temperature range is choosen from 800 to 1000℃. The contained nitrogen of surface and monolith is tested by X-ray photoelectron spectroscopy (XPS) and elemental analysis. It is shown that the nitrogen concentration of N-ACA decreases，while the presence of pyridinic nitrogen increase, the increased pyridinic nitrogen beneficial to improve the capacity of donor electron.
  • Application in Small-size and Band-width of Microstrip Antenna for Ferrocenyl Organic Magnet/BLT Microceramics Composites
    LIN Yun;JIANG Hu-nan;LIN Chen-ru;WEI ke-zhu
    . 2013, 44(S1): 153-156.
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    Abstract：A novel as yet unreported magnetic composite，ferrocenyl magnet/BLT microceramics(ie.OPM/BLT) were prepared，the effective permeability(μe) and effective dielectric constant(εe) of composite were measured by theory and phase delay method，The result shows that the experimental results are in good agreement with that of the theory。However，the theory caculates is a simple and practical method for μe andεe obtanted,On the other hand the band-width was 8.6%and can be used to reduce geometric dimension of microstrip antenna(OPM/BLT=20/80，mass%) by 20.7% in 1616MHz，their good gain and axial radio are also obtained。Therefore，small-size as well as width-band of microstrip antenna were obtained by simple structural design ，and have important value in application for military industries and high-tech products。
  • Preparation and property characterization of konjac glucomanman xerogel
    ZHOU Dan;KE Wei-chang;CHEN Yi-kun;LI Dan;JIANG Fa-tang
    . 2013, 44(S1): 161-165.
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    Konjac glucomanman (KGM) xerogels were prepared by sol-gel and freeze-drying method using konjac glucomanman (KGM),starch and other plant polysaccharides as basic materials.The structure and property of this xerogels were systematically investigated by TMS-PRO,SEM,nitrogen adsorption/desorption analysis,Water vapor adsorption equilibrium and DSC-TGA.The experimental results show that the KGM xerogels have smooth surface ,no shrinkage and collapse.The xerogels show three-dimensional (3-D) porous network structure.The surface area of xerogels is 51.84m2/g.The average diameter of hole is 50nm.The xerogels can adsorb moisture under different humidity from RH50% to 80%.Moisture content is from 6%-16%.The xerogels sample can keep the original form after moisture absorption.According to the results,the sample in the 169 ℃ internal stability is well.
  • Simulation of the Droplet Vibration During Preparation of Mono-sized Micro Particles by Pulsated Orifice Ejection Method (POEM)
    ZHAO Li;XU Fu-min;DONG Wei;LI Ying;KAWASAKI Akira
    . 2013, 44(S1): 166-170.
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    During the preparation of mono-sized particles by pulsated orifice ejection method（POEM）, simulation method was used to study the behavior of the effects of physical properties on the droplet vibration. The way to prepare mono-sized micro particles with high sphericity under different atmosphere was obtained through the comparation the vibration time and solidification time of different sizes of liquid droplets. The results show that vibration existed in droplet during its formation and the shape of droplet changes to spherical with the vibration tends to small. With the increase of surface tension, the vibration frequency increases and the vibration time decreases; with the increase of viscosity, vibration frequency changes little, but vibration time decreases greatly. As for materials with low melting points, it is suitable to choose Ar as atmosphere gas. The high spherical is easier to be obtained when the sized of particle is small.
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