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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Synthesis and magnetic properties of water-based Fe_3O_4 ferrofluid

    Xiu-rong QuShu-chen LueShu-fang FuQing-yu Meng...
    533-536页
    查看更多>>摘要：Stable water-based Fe_3O_4 ferrofluid was obtained by three steps. Fe_3O_4 nanoparticles with the size of about 10 nm were first prepared by chemical co-deposition method. In order to prevent Fe_3O_4 nanoparticles from agglomerating, they were coated by bilayer surfactants. Then, the coated Fe_3O_4 nanoparticles were dispersed well into water. Due to the actions of electrostatic force and hydrogen bond, the water-based Fe_3O_4 ferrofluids can keep stable for two years and no layered phenomenon occurred. The ferrofluid has high saturation magnetization, low remnant magnetization and coercive force.
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    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    FeSiB annealing technology based on amorphous ribbons of the linear expansion coefficient

    Chun-ying HuangMan-hua WanXiao-jun Wang
    537-539页
    查看更多>>摘要：The 4.5mm wide 25μm thick Fe_(78)Si_9B_(13) amorphous alloys were prepared by single-roller method, and it was annealed. The elastic modulus, tensile deformation and line expansion coefficient were investigated by Q800 (dynamic mechanical thermal analyses, DMA). The results showed that the elastic modulus, tensile deformation and line expansion coefficient were enhanced when annealed. Comparing with the annealed ribbons, the change rules of elastic modulus, tensile deformation and line expansion coefficient of the quenched are evident, that the elastic modulus decreases and tensile deformation increase with temperature increases, but line expansion coefficient firstly increase then decrease with temperature increases.
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    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on quantum state in fabricating poly-Si films

    Ruimin JinLan-li ChenPenghui LuoXinfeng Guo...
    540-543页
    查看更多>>摘要：Amorphous silicon films prepared by PECVD on glass substrate have been crystallized by rapid thermal annealing (RTA). By means of micro-Raman scattering and scanning electronic microscope (SEM), the quantum states in these processions are found and discussed.
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    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Microstructures of strontium aluminates and polystyrene phosphorescent composite films

    Ye-tang GuoYuan Ming Huang
    544-547页
    查看更多>>摘要：Strontium-aluminates-based phosphorescent composite films were prepared by homogeneously distributing the green light emitting phosphors within polystyrene hosts. The composite films have the unique properties of flexibility of the polymers and the long-lasting phosphorescence of the strontium-aluminates-based phosphors. The microstructures of the flexible composite films were characterized with scanning electron microscopy. The results indicated that the organic and inorganic materials can be combined with each other better, and the composite films can be easily rolled but will not generate cracks. Therefore, this composite technology can effectively enhance the moisture resistance of the phosphors and the films can be used in the filed of information display.
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    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Size-dependent conductivity of polypyrrole doped with anthraquinone-2-sulfonic acid sodium

    Fu-fang ZhouBao-gai ZhaiChun-xu PanYuan Ming Huang...
    548-551页
    查看更多>>摘要：By varying the dopant-to-monomer ratio in a wide range of 0-110%, a series of polypyrroles doped with 9,10-anthraquinone-2-sulfonic acid sodium were synthesized by polymerizing the monomer pyrrole in aqueous solution of ferric chloride. The resulted polypyrroles were characterized with the four-probe, laser light scattering and differential thermal analysis, respectively. Our results indicated that the average particle size dominates the change in conductivity and thermal stability for the resulted polypyrrole at different dopant concentration.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Preparation and properties of PZN-PZT/PVDF piezoelectric composites modified by graphite

    Shan HuShangyue ShenHongchang Han
    552-555页
    查看更多>>摘要：The graphite-modified PZN-PZT/PVDF composites were fabricated by hot-pressed process using PZN-PZT ceramic powder, PVDF and graphite powder. The effect of graphite content on the electrical properties of the piezoelectric composites was investigated. The results indicated that the piezoelectric constant d_(33) could be enhanced obviously by adding suitable content of graphite into the composites. When 0.8wt% graphite was added, the PZN-PZT/PVDF composites showed the excellent properties: σ=3.31×10~(-6)S/m, ε_r=133, tan8=0.066, K_p=0.228, Q_m=22.8 and d_(33)=40.6pC/N, which showed 28% higher than that of the composites without graphite.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Design of signal conditioning module of PT100 temperature sensor detection system

    Xiao-jun WangXi Yin
    556-560页
    查看更多>>摘要：The measuring circuit of signal conditioning module of platinum resistance temperature sensor detection system uses a sub-three-wire connection mode. It can improve the measurement accuracy and reduce the measurement error caused by the external circuit. The amplifier circuit is an operation circuit using in phase input. The system can achieve multi-channel measurement of sensor by using multiplexer with the measurement accuracy of 0.1℃.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Super liquid crystal

    Guo-Chen Yang
    561-568页
    查看更多>>摘要：If a spontaneous orientation order appears in the liquid crystal- droplets system of a polymer dispersed liquid crystal (PDLC), and the order parameter satisfies S = <P_2 (cosθ)> ≠ 0, then the corresponding state is called as the super-liquid-crystal (SLC).It is suggested that by reforming the ordinary PDLC making-scheme assumed SLC state may be observed in experiments.
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    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A novel denoising algorithm based on fuzzy clustering and wavelet transform

    Shan WeiChun-juan OuYangSi-min Wei
    569-572页
    查看更多>>摘要：According to analyzing the different wavelet coefficients' transmission property of signals and noises under different scales of the wavelet transform, LEFC denoising algorithm based on fuzzy clustering and wavelet transform is proposed. Our experimental evaluations show that the algorithm is effective and robust to restore the images compared with the other wavelet soft-thresholding algorithms. When the ratio exceeds 40 %, LEFC gives superior performance.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Photonic crystal Fabry-Perot self-collimation interferometer by liquid crystal infiltration

    Guozhong LaiXiyao ChenYufei WangHong Lin...
    573-578页
    查看更多>>摘要：A Fabry-Perot self-collimation interferometer (FPSI) constructed in a two-dimensional photonic crystal (2D PhC) by liquid crystal infiltration has been proposed and demonstrated theoretically. The resonant cavity of FPSI is infiltrated with a nematic liquid crystal (LC) 5CB with ordinary and extraordinary refractive indices 1.522 and 1.706, respectively. The transmission spectrum of the FPSI has been investigated with the 2D finite-difference time-domain method. Calculation results show that resonant transmission peaks have nearly equal frequency spacing 0.0090c/a. When the effective refractive index n_(eff) of the liquid crystal is increased from 1.522 to 1.706, the peaks shift to the lower frequencies over 0.0071c/a while the peak spacing is almost kept unchanged. Thus this FPSI by LC infiltration can work as a tunable attenuator or an optical switch. For the central operating wavelength around 1.55μm, its dimensions are only about tens of microns. Thus this device may be applied to photonic integrated circuits.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd