15 December 2015, Volume 46 Issue 23

    

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  Nitrogen-doped micro-meso hierarchical porous carbon with electrochemical properties

  Guiqiang Wang

  功能材料. 2015, 46(23): 1-0.

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研究 开发
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  Evolution of InAs/GaAs quantum dots morphology with different InAs supply

  Zhen ZHAO;;Xiang GUO;Luo Zijiang ;;Wen-zhe WEI;

  . 2015, 46(23): 2-0.

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  Nanoholes were fabricated on GaAs (001) surface by Ga droplet etching，then InAs quantum dots with varying InAs supply were formation on this surface by molecular beam epitaxy. The condition of sample surface was monitored with a reflection high energy electron diffraction system in situ, scanning tunneling microscopy was utilized for analysis the formation and distribution of quantum dots with increasing InAs supply. The result indicated that InAs will follow the Stranski-Krastanov growth mode on the GaAs flat surface. At the same time, on the nanohole location, the steps in and around nanoholes will restrict the nucleation of quantum dots. However, this restriction will become weaker with increasing InAs supply. Especially, when InAs deposition increased to 2 monolayers, ring-like nanostructures consist of InAs quantum dots with uniform size will be observed on the nanohole location.
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  The design and optimization of a ultra-broad band, light-weight, and wide incident angle metamaterial absorber based on topology optimization

  Sai Sui;Hua Ma ;PANG Yong Qiang;;

  . 2015, 46(23): 3-0.

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  According to topology optimization and genetic algorithm, a light, wide-band, insensitive of incident and polarized angle metamaterial absorber composed of the resistance frequency selective surface (RFSS). The range of absorption over 90% is range from 3.4GHz to 23.2GHz and the relative band is 149%. The absorber can maintain the absorption over 80% with TE polarization to 55° and it keep large than 90% to 70° with TM polarization. The areal density is only 0.35g/cm3, meanwhile, the absorber is easy to be fabricated; meanwhile, the topology optimization method can be used in the design of frequency selective surface and left-hand material.
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  Influence of Bentonite on Pore Structure and Strength of Foam Paste Backfill Materials

  Qing-Ping WANG

  . 2015, 46(23): 4-0.

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  The hydration products and pore structure of foam paste backfill materials with or without bentonite was analyzed by X-ray diffraction(XRD) and scanning electron microscopy(SEM), the influence of the content of bentonite on 28 days compressive strength of foam paste backfill materials was studied. The results showed bentonite improved the stability of the bubbles, which was beneficial to the bubble introduction. As a result, it was easy to prepare foam paste backfill materials with low dry density. However, bentonite had a certain inhibitory effect on the generation of hydration products; With 2~4 wt% bentonite, the content of microspore was significantly increased, and pore size distribution was concentrated. Because of relatively uniform pore structure, compressive strength of foam paste backfill materials had been improved, 28 days compressive strength could reach 0.50~0.73 MP, which could meet the operating requirement of coal backfill.
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  Effect on the Strength of Glass Fibers and Composites Materials Modified with Carbon NanoTubes on the Glass Fiber Surface

  qingwei wangxin wu; ;;

  功能材料. 2015, 46(23): 5-0.

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  Due to the good mechanical properties, glass fibers are widely used as fiber reinforced composites (FRPs). For certain, the interface between glass fibers and matrix is one of the key factors on affecting the performance of composites. In the article the modified CNTS was dispersed uniformly into the sizing agent, and was coated to the surface of glass fiber through the on-line forming process up to manufacture the composites. Through mechanical properties testing and micrograph observation, it was found that the CNTs was sprinkled in the surface, and 0.5wt.% CNTs can improve the strength of glass fiber. Moreover, it can promote the combination between the fiber and resin, and enhance the strength of composite materials.
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  Biosensor Based on Up-converting Phosphors as Energy Donor for Sensing Biomolecules

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  功能材料. 2015, 46(23): 6-0.

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  In this study, we design a new biosensor using up-converting phosphors (UCPs) as the energy donor for biomolecules sensing. The problem of the limited quenching efficiency was effectively resolved by constructing MB sensors in this work. Because of the stem-loop hairpin structure, it can reduce the donor-to-acceptor distance and hence significantly increased the energy transfer efficiency and improved the sensitivity. We apply this sensor in the detection of target-DNA and thrombin with satisfactory results obtained. What’s more, the up-converting MB sensor in simple and flexible structure was used to monitor thrombin in complicated biological sample matrix, demonstrating the ability of anti-interference.
研究 开发
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  Determination of the Optical Constants of Te/TeO2-SiO2 Composite Films Based on Transmission and Reflectance Spectra

  Ping Ganmin gu

  . 2015, 46(23): 7-0.

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  Based on the electrochemical induced sol-gel method, this experiment product the uv-ir spectrum of the Te/TeO2-SiO2 composite films. This paper adopted the spectral reflectance and transmission measurement method deduced the optical constants of Te/TeO2-SiO2 composite film in 200-1100 nm wavelength range, including optical transmittance, reflectance, linear absorption coefficient, extinction coefficient, linear refractive index and optical band gap . The study found that the composite films is of many great optical properties, such as high refractive index (1.93 to 2.03), the test wavelength of 1064 nm , low absorption and broad forbidden band width (3.07-3.40 eV). Besides the optical constants of composite films shows strong dependency on the voltage. The lower the voltage, the greater the optical transmittance . At the same time the film thickness is thinner , and the linear refractive index is lower.
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  Influence of substrate material on microstructure of TeO2 nanowires

  ;;;Yan-bai SHEN

  . 2015, 46(23): 8-0.

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  TeO2 nanowires were synthesized at 450℃ by thermal evaporation method using Te powders as the source material. The influence of various substrate materials on structure and morphology of TeO2 nanowires was investigated. It was found that TeO2 nanowires with fine crystallinity, high surface-to-volume ratio, and large yield could be obtained on Au-coated glass and Si substrates. TeO2 nanowires were also observed on non-coated and Au-coated Al2O3 substrates in spite of relatively low surface-to-volume ratio and poor morphology. However, TeO2 microparticles were found on non-coated glass and Si substrates. It is concluded that the growth of TeO2 nanowires is based on vapor-solid growth mechanism because Au nanoparticles deposited on the substrates only accelerate the growth of TeO2 nanowires.
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  Impact Study of Anti-freezing Agent on Bubble Stability Performance of Concrete Air-entraining Agent

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  . 2015, 46(23): 9-0.

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  In order to explore the influence of anti-freezing agent on bubble stability performance of concrete air-entraining agent, the cement slurry bubble test was carried out considering sensitivity factors which was four kinds of anti-freezing agents and different dosages, and analyzed its effects on foaming ability, stabilizing foam ability and mechanism. The results revealed that bubble volume attenuation index model of shake bubble test was set up, which parameters characterized the foaming ability and stabilizing foam ability of different air-entraining agents. Calcium nitrate had a positive effect on stabilizing foam ability of the saponins air-entraining agent, and anti-freezing agents had a negative effect on it. Ethylene glycol had a positive effect on foaming ability of the benzene sulfonate air-entraining agent, the significance of improving the stabilizing foam ability was calcium nitrite > calcium nitrate > ethylene glycol. Four kinds of anti-freezing agents all had a negative impact on the air content of fresh concrete mixed with the saponins air-entraining agent, the most significant of it was ethylene glycol, and the least significant was calcium nitrite. Calcium salts anti-freezing agents had a negative impact on the air content of fresh concrete mixed with Benzene sulfonate air-entraining agent, ethylene glycol had a positive effect on it.
综述 进展
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  Influence of P/M mass Ratio on Properties of Magnesium Phosphate

  ming xue;

  . 2015, 46(23): 10-0.

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  This paper researched the influence of mass ratio of Ammonium Biphosphate（P）to Magnesium Oxide（M）on?the?compressive strength?and setting time of?magnesium phosphate cement（MPC）. The influence mechanism of the P /M, which could help to provide theoretical basis for improving the performance of the MPC, was analyzed by X-ray diffraction(XRD), scanning electron microscope(SEM) and election diffraction spectrometer(EDS). The results show: the MPC material system was composed of a large number of unreacted MgO particles cemented by hydration products. MgO style was essential to the hydration reaction rate and the development of the MPC’s strength; Hydration products of the MPC were mainly magnesium ammonium phosphate and magnesium phosphate compounds, its composition and the crystal morphology structure is affected by P/M molar ratio greatly. When P/M ratio was 1/4 ~1/5, the structure of the hydration products was dense, and the strength of the MPC was higer.
工艺 技术
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  Preparation and Wear Properties of TiAlN and TiCrAlN Films

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  . 2015, 46(23): 11-0.

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  A series of TiAlN, TiCrAlN single-layer films and TiCrAlN/TiCrN multi-layer film were deposited by arc ion plating and unbalanced magnetron sputtering. The morphology, phase composition, elements content and wear resistance were investigated by scanning electron microscope, X-ray diffraction, Auger electron spectroscopy and wear tester. The results showed that，the Ti/TiN interlayer could effectively improve the adhesion properties between the film and substrate. TiCrAlN/TiCrN multilayer film exhibited the best adhesion strength and wear resistance, which is fit for the surface modification of cutting tools.
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  Optimization of dispersion conditions of Al2O3 nanoparticles in Simulated Cooling Water

  Qun YUAN

  . 2015, 46(23): 12-0.

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  Nanofluids were prepared using Al2O3 nanoparticles in simulated cooling water. The stability of nanofluids was characterized by Zeta potential. The effect of Dodecyl benzene sulfonate (SDBS) concentration, sonication time, solution pH on the stability of nanofluids and the optimum conditions were researched in this paper. Results of single factor experiments revealed that the absolute value of Zeta potential|ζ|of nanoparticles increased first but then decreased with the increase of the SDBS concentration, sonication time and pH value. Based on the preliminary experimental results, the Box-Behnken design (BBD) model of response surface methodology was applied to optimize nanoparticle dispersion conditions in simulated cooling water. Results showed that the contribution of SDBS concentration to ?ζ? was maximum, than the solution pH value; the interactions between SDBS concentration and pH, sonication time and pH were relatively obvious; the optimal condition to obtain stable Al2O3 nanofluid achieved from BBD model was SDBS at weight concentration of 0.339%, ultrasonic time 61min, pH value 8.05, and the predicted value of|ζ|was 50.8 mV. The experimental value of|ζ|at the optimal condition was 50.6mV, which is very close to the predicted value.
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  Investigation of Preparation and Luminescent of Europium Complexes Modified by Silane

  Qing-Jing XU ;

  功能材料. 2015, 46(23): 13-0.

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  The rare earth ternary complexes have good fluorescence properties, but the lower optical and thermal stability of simple complexes would limit their application. In this paper the modified ligands were combined by o-phthaloyl chloride and aminopropyl silane coupling agent, and the modified complexes were prepared by the coordination between the modified ligands and Eu cations. Eu cations would emit luminescence with antenna effect, which could transfer energy and promote the luminescence of the modified complexes. The influence of the different reaction condition on the yield of reaction and the fluorescence emission intensity were investigate. The stable structure of complexes were inferred with FT-IR and UV spectra and fluorescence emission intensity. The results showed that the complexes modified by silane had the stronger fluorescence emission intensity, which indicated that a better match exist between the first excited energy level of Eu3+ and the triplet energy level of modified ligand.
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  Fabrication and properties of Field emission electron source based on planar-gate triode with ZnO emitters

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  功能材料. 2015, 46(23): 14-0.

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  Field emission electron source based on planar-gate triode with ZnO emitters were fabricated by conventional photolithography and hydrothermal method. The optical microscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to characterize the microstructures and morphologies of the as-grown samples and the growth mechanism was discussed. Its field emission characteristics were also investigated. The experimental results show that the average diameter of ZnO nanorods with hexagonal wurtzite structure was approximately 300nm and ZnO emitters were synthesized on the cathode of planar-gate triode. The field emission measurements show that the emission properties of electron source based on planar-gate triode with ZnO emitters were completely modulated by gate voltage. The turn-on voltage was around 150V and anode current came to 345μA when anode voltage was set to 2000V. The emission current ?uctuation was approximately ±5.5% for 400min and luminous brightness can come to 750cd/m2 at the gate voltage of 260V, indicating that the fabricated device had a good emission performance.
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  Preparation and blood compatibility of PVDF membrane modified with L-Arginine

  Jiang Zhi xu;JIA Jin lan;;

  功能材料. 2015, 46(23): 15-0.

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  L-Arginine (ARG) was covalently immobilized onto the surface of poly(vinylid- ene fluoride) (PVDF) membrane that were prepared by the method of alkali treatment and using acrylic acid (AA) as the intermediary. The surface chemistry changes of modified films were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy. It is found that the grafting degree of the ARG increases with the increase of ARG concentration in the reaction solution. The in vitro anticoagulant activities of the surface-modified PVDF membranes were evaluated by hemolytic test, and plasma recalcification time (PRT), protein adsorption, platelet adhesion. The results indicate that the PVDF membrane modified by ARG can suppress the protein adsorption, platelet adhesion, hemolysis rate and prolong the plasma recalcification time.