English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 49194/83570 (59%)
造訪人次 : 7091523      線上人數 : 53
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/24873


    題名: Chirality in mixed nematic and cholesteric liquid crystals
    作者: 余良杰;Yu, L. J.;Oron, N.
    貢獻者: 淡江大學化學學系
    日期: 1973
    上傳時間: 2009-12-01
    出版者: Springer
    摘要: A mechanism is discussed explaining the different types of pitch-concentration dependences encountered in chiral mesophases. Addition of a low concentration of a chiral compound to a nematic produces a mesophase in which pitch is initially inversely proportional to concentration, but as the concentration increases, three different types of behavior occur: (a) the pitch slowly saturates as it approaches that of the pure chiral (cholesteric) compound; (b) the pitch decreases to a minimum pitch value (MPV) and then increases again to that of the pure cholesteric; (c) the pitch decreases to a MPV, increases to infinity and then decreases again to that of the pure cholesteric. This type of “compensation” which usually occurs only when a right-handed and left-handed cholesteric are mixed, is reported here for a mixture of choles-teryl-2(2-ethoxyethoxy) ethyl carbonate and the nematic N-p-methoxy-benzylidene-p-n-butylaniline. Thus, starting from a pure cholesteric, pitch may either increase or decrease upon adding a non-chiral solute. The common mechanism involves the induced circular dichroism (ICD) in the non-chiral compound caused by the helical arrangement of the chiral mesophase, which may be of the same or opposite sign as the ICD. The pitch of the pure cholesteric compound, the structure of the non-chiral compound and its affinity to ICD are important in determining which type of spectral behavior is observed.
    關聯: Liquid crystals and ordered fluids 2, pp.403-410
    DOI: 10.1007/978-1-4684-2727-1_36
    顯示於類別:[化學學系暨研究所] 期刊論文

    文件中的檔案:

    沒有與此文件相關的檔案.

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

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