热致晶体
液晶
材料科学
卵磷脂
结晶学
液晶
化学
色谱法
光电子学
作者
K. Hiltrop,Jörg Hasse,H. Stegemeyer
出处
期刊:Berichte der Bunsengesellschaft für physikalische Chemie
日期:1994-02-01
卷期号:98 (2): 209-213
被引量:22
标识
DOI:10.1002/bbpc.19940980213
摘要
Abstract The orientation of thermotropic nematic and smectic liquid crystals at monomolecular films of lecithin on glass as well as germanium substrates has been studied by polarizing microscopy and FTIR spectroscopy. Nematic liquid crystals with only a weak tendency to form smectic phases exhibit a dependence of their orientation on the temperature and the packing density of the monolayer which can be explained by a sterical model. Liquid crystals in the smectic A phase as well as nematics with a strong tendency to build up smectic layers, however, align homeotropically, independent on the packing density of the lecithin film and the temperature. This can be understood as a screening of the lecithin film properties by the smectic‐like boundary layers of the nematic liquid crystal.
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