THE SMECTIC-C SMECTIC-A TRANSITION IN FREESTANDING LIQUID-CRYSTAL FILMS - AN EXAMPLE FOR CRITICAL-BEHAVIOR INDUCED BY A CONFINED GEOMETRY

被引：2
|
作者：
BAHR, C
FLIEGNER, D
机构：
来源：
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 1993年 / 97卷 / 10期
关键词：
CRITICAL PHENOMENA; LIQUID CRYSTALS; PHASE TRANSITIONS; SURFACES;
D O I：
10.1002/bbpc.19930971034
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We report on an ellipsometric study of a phase transition in thin free-standing films of a smectic liquid crystal. The smectic-C- smectic-A transition, which is first-order in bulk, becomes continuous in films thinner than about 15 molecular layers indicating the influence of a strong ordering field resulting from surface interactions. The experimental results are discussed within the framework of a simple Landau model consisting of the bulk parameters and extended by a linear coupling to a surface field which decays exponentially from the surface to the interior of the film.
引用
收藏
页码：1381 / 1386
页数：6
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