English  |  正體中文  |  简体中文  |  Items with full text/Total items : 51258/86283 (59%)
Visitors : 8018023      Online Users : 69
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/987654321/24917


    Title: Design and investigation of calamitic liquid crystals with low aspect-ratios : Rigid y-shaped 1,2,4-tris(4-alkoxyphenylethynyl)benzenes
    Authors: 徐秀福;Hsu, Hsiu-fu;Chen, S. J.;Kuo, C. H.;Wong, B. C.;Chiu, H. T.
    Contributors: 淡江大學化學學系
    Date: 2005-10-10
    Issue Date: 2009-12-01
    Publisher: Cambridge: Royal Society of Chemistry (RSC)
    Abstract: The synthesis and characterization of triynylbenzenes, 1-iodo-2,4,5-tri(4-alkoxyphenylethynyl)benzenes (1), are reported, and their structure–mesomorphism relationship is investigated. These compounds possess a y-shaped geometry with rigid linear spacers and a stable nematic phase that was achieved by lengthening the alkoxy chains or replacing the iodo group with a smaller atom. The low aspect ratios and identified calamitic nature of these rigid y-shaped liquid crystals make them suitable as potential candidates to be used in the liquid crystal layer of liquid crystal display devices for improving viewing angles. In addition, the geometry of 1 was modified stepwise from a rigid y-geometry to a rigid rectangle for realization of the unstable nematic behaviors of the previously reported board-like 1,2,4,5-tetrakis(4-tridecyloxyphenylethynyl)benzene that was expected to potentially show biaxial nematic phases. The sizes of the fourth side-arm and hence the aspect ratios of these tetra-substituted benzenes are ascribed to the less liquid crystallinity.
    Relation: Journal of materials chemistry 15(45), pp.4854-4861
    DOI: 10.1039/b511530b
    Appears in Collections:[化學學系暨研究所] 期刊論文

    Files in This Item:

    File Description SizeFormat
    b511530b.pdf419KbAdobe PDF269View/Open
    index.html0KbHTML89View/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