English  |  正體中文  |  简体中文  |  Items with full text/Total items : 58323/91877 (63%)
Visitors : 14306413      Online Users : 128
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/25049

    Title: Mesophases of Hockey Stick Mesogens
    Authors: Yu, F. C.;余良杰;Yu, L. J.
    Contributors: 淡江大學化學學系
    Keywords: anticlinic phase;antiferroelectric phase;chiral dopant;ferroelectric phase;hockey stick molecule;synclinic phase
    Date: 2008-07-01
    Issue Date: 2010-08-10 09:57:23 (UTC+8)
    Publisher: Taylor & Francis
    Abstract: Enantiotropic anticlinic smectic C (SmCa), smectic C (SmC), smectic A (SmA) and nematic (N) phases of hockey stick molecules were obtained by tuning the length of hydrocarbon chain located at the meta-position to the carbon-carbon double bond of a stilbenyl moiety of calamitic mesogenic skeletons. The thermodynamic properties and some aspects of optical appearance of these phases are indiscernible from those of calamitic mesogens. Distinctions are noted such as the appearance of two-brush defects and two types of domains in the tilted smectic phases. X-ray results indicate the existence of clusters in the nematic phase and simple layer structure in the smectic phases. These phases exhibit electric field driven colour switching, and all the results imply that all three molecular axes are simultaneously aligned in the N and SmC phases, a behaviour unprecedented and different from those of conventional calamitic mesogens. Doping with a chiral calamitic mesogen results in formation of corresponding chiral N and ferroelectric SmC phases, but the effect for the SmCa phase is not clear. Small and comparable values of spontaneous polarisation are obtained for the doped and non-doped phases. Molecular organisations of the SmC and SmCa phases are proposed and discussed.
    Relation: Liquid Crystals 35(7), pp.799-813
    DOI: 10.1080/02678290802195697
    Appears in Collections:[Graduate Institute & Department of Chemistry] Journal Article

    Files in This Item:

    File Description SizeFormat
    0267-8292_35(7)p799-813.pdf672KbAdobe PDF259View/Open
    Mesophases of Hockey Stick Mesogens.pdf871KbAdobe PDF0View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback