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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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    Calculation and prediction: An effective security device consisted of photo alignment nematic liquid crystal films and polarizers

    Jiwei ZhouGuangming KeBin WangWeidong Liu...
    301-304页
    查看更多>>摘要：The paper reports the methods for making a novel optical device consisted of photo alignment nematic liquid crystal films and polarizers. The color shift of the device depends on not only the viewing angle but also the viewing orientation. The retardation and intensity of the reflected light are theoretically calculated on the basis of Jones Matrix, and a spectral-RGB transition program is introduced to display colorful results directly. The theoretical results show excellent agreement with experimental data. It is an effective method for predicting interference color and optimizing key parameters of the device. The device can be used to protect valuable documents against fraud because of its special optical variable effects which is caused by interference of polarized light.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Photo-instability in a binary mixture of banana-shaped and rod-shaped liquid crystals

    Lan-li ChenBao-gai ZhaiYuan Ming Huang
    305-308页
    查看更多>>摘要：By triangular wave method, we studied the effects of ultraviolet irradiation on the polarization of a binary liquid crystal mixture. The mixture was comprised of 94 wt% of banana-shaped liquid crystal 4-chloro-l,3-phenylene bis [4-(4-n-tetradecyl) phenylimino methyl] benzoate and 6 wt% of an azo-containing rod-shaped liquid crystal hexanoic acid 4-(4-ethoxy-phenylazo)-phenyl ester. Under the 365 nm irradiation for 40 minutes, the polarization of the mixture was observed to decrease 10% although the component of the banana-shaped liquid crystal was photostable. Our results demonstrated that photolysis took place in the component of azo-containing rod-shaped liquid crystal.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Anisotropic reflectivity of rubbed polyimide liquid crystal alignment layer

    Wenjun Zheng
    309-316页
    查看更多>>摘要：The surface optical anisotropy of rubbed polyimide films has been detected using reflection anisotropy spectroscopy. The amplitude of the reflection anisotropy signals increases with the rubbing strength. Rubbing also causes changes in pretilt angle of liquid crystal molecules which are in contact with the rubbed polyimide. An increase in rubbing strength results in an increase in the pretilt angel. The pretilt of the liquid crystal molecules was found to linearly correlate with the amplitude of the RA signals.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Electronic transitions in a classical antiferroelectric banana-shaped compound

    Bao-gai ZhaiYuan Ming Huang
    317-321页
    查看更多>>摘要：The electronic transitions in a classical banana-shaped liquid crystal 1,3-phenylene-bis [4-(4-octylphenylimino) methyl] benzoate have been investigated by measuring its optical absorption spectra in dilute solutions of ethyl alcohol and by calculating its electronic structures with extended Huckel tight binding program. The banana-shaped compound shows strong absorptions at 240, 280, 350 nm, respectively. On the basis of the calculated electronic structures, the three strong absorptions can be assigned to the π→π~*, n→π~*, and n→n~* electronic transitions in this banana-shaped compound.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Effects of cyclic heating and cooling on the banana-phase growing behaviors of banana-shaped liquid crystal 1,3-phenylene-bis[4-(4-octyl phenylimino)methyl]benzoate

    Yuan Ming HuangQing-Ian MaBao-gai Zhai
    322-325页
    查看更多>>摘要：The effects of cyclic heating and cooling on the banana-phase growth behaviors of the prototype banana-shaped liquid crystal 1,3-phenylene-bis[4-(4-octylphenylimino)methyl]benzoate were investigated with differential scanning calorimetry and polarized optical microscopy, respectively. Cyclic heating and cooling can reduce the phase transition temperatures and increase the domain sizes of the banana phases of the banana-shaped liquid crystal. These results can be interpreted in terms of the nucleation and growth of the banana phases out of its isotropic phase of the banana-shaped liquid crystal.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Half-buried structure Cu bus line in TFT LCD

    Honglong NingChang-Oh JeongKiyong SongSunghen Cho...
    329-334页
    查看更多>>摘要：As we know, we normally used stacked aluminum bus line as the Gate or Source/Drain layer in LCD now, but the next general LCD needs larger display area, higher resolution, and faster response time, so we need develop the new TFT bus line structure and select the appropriate metallization materials to decrease the resistance of bus line. There are many new kinds of structure and material were used, for example copper, silver and their alloys, pure copper have some advantages among them because of its low electric resistance and cost, but it is restricted by the problem of pure copper's lifting and etching. In this paper, we not only use electroless copper plating to decrease the resistance and cost of bus line but also use the half-buried structure to increase the thickness of bus line, it can combine these two new technologies well in LCD. We use the half-buried structure copper bus line to make some panel samples, it can decrease the delay of RC greatly (it is lower than 1/4 of normal aluminum bus line panel in the same size).
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Controllable viewing-angle display using GHLC cell as backlight panel

    Wenjun YangJinbi LengZiqiang HuangXiaoxi Chen...
    335-339页
    查看更多>>摘要：There is a desire for a display technology which can change the display viewing angle. Controllable Viewing Angle (CVA) device has been developed by using a Guest-Host liquid crystal cell which allows a high light-shielding effect and the control with a wide range of available viewing angle. By putting the CVA device on a Thin-Film Transistor ( TFT ) Liquid-Crystal Panel, or placing a Guest-Host Liquid Crystal (GHLC) device between the LED and the backlight, we have realized a simple controllable viewing-angle LCD which could be switched in the narrow and normal(wide) viewing angle. The viewing angle can decrease to 40° when power is on but it also can shift to normal viewing angle when power is off.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Investigation on properties of dye ink prototype e-paper

    Lu-hai LiYi FangShu-nan Qiao
    340-344页
    查看更多>>摘要：The pigment electrophoresis dispersion has been the widely used system. It is, however, worth of attention if molecular dye, instead of pigment, can be used in the display of electronic paper. By carefully selecting the structure of dyes, especially the metal complex dyes, and studying the properties of the prototype display. It was found there are about 15 dyes electrophoresis and some dyes display well. The dyes ink with good stability during electrophoresis when the electrode was protected, while the response time is about 300 ms, and the concentration is an important factor on the display optic density. The displaying principle of dye ink was studied too.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis and properties of UV-curable sealant for LCD panels

    Qing-Ian MaYuan Ming Huang
    345-348页
    查看更多>>摘要：Ultraviolet curable sealant was synthesized by polymerizing epoxy resin with acrylic acid in the presence of catalyst N,N-dimethylbenzylamine. The synthesized ultraviolet-curable sealant could be solidified upon exposure to 365 nm ultraviolet irradiation for 8 seconds. The optical, mechanical and thermal properties of the ultraviolet-cured sealant were investigated with ultraviolet-visible spectrometer, tensile machine and differential scanning calorimetry, respectively. Our results demonstrated that the transparent and thermally stable sealant was strong enough for liquid crystal display panels.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Crystallization of calcium carbonate vaterite involves with another mechanism associated with liquid crystal in embryonic yolk sacs

    MengMeng XuOdell JonesGuanliang CaoGuifang Yan...
    349-355页
    查看更多>>摘要：Calcium carbonate is often used as an efficient antacid that absorbs and neutralizes stomach acid while providing calcium for healthy bones. Taking advantage of the lack of adverse side effects of calcium, new drug delivery systems consisting of drug-supported spherical microparticles are being developed. We have reported in our previous studies that a natural process producing calcium carbonate microparticles can be found during avian development. These natural systems provide inspiration for designing more efficient microparticle facilitated drug-delivery systems. In this study, the formation and re-absorption of calcium carbonate crystals were tracked during Gallina N. meleagris embryogenesis and early postnatal development. The study demonstrated that the formation of calcium carbonate microparticles, as calcium is transferred from the eggshell into the egg sac, is a process of calcium preservation. X-ray diffraction showed that calcium carbonate crystal is mainly preserved in the vaterite isoform. Calcium incorporated into the yolk sac during this process can be easily assimilated as necessary during postnatal development. Eons of evolution have yielded a calcium preservation process that produces an iso-form of crystalline calcium most readily absorbed by the organism. Our previous results indicate that this biological system is likely a lyotropic process, the method that is currently being used for the production of microparticle drug delivery systems. In this work, our data suggests that calcium carbonate crystal can also initiate its crystallization from the center of liquid crystal, recognizable by a chimeric thermal phase transition. Our work provides valuable information for designing more efficient microparticle for drug-delivery.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd