FORCE MICROSCOPY OF CHIRAL LIQUID-CRYSTAL SURFACES

被引：21
|
作者：
TERRIS, BD [1 ]
TWIEG, RJ [1 ]
NGUYEN, C [1 ]
SIGAUD, G [1 ]
NGUYEN, HT [1 ]
机构：
[1] CNRS,CTR RECH PAUL PASCAL,F-33600 PESSAC,FRANCE
来源：
EUROPHYSICS LETTERS | 1992年 / 19卷 / 02期
关键词：
LIQUID CRYSTALS; OTHER DETERMINATION OF STRUCTURES;
D O I：
10.1209/0295-5075/19/2/005
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The free surface of chiral liquid crystals has been observed by optical and scanning force microscopy. In a narrow temperature region near the smectic A* to cholesteric (or isotropic) transition, a unique periodic surface undulation is observed. Both the period and depth are seen to be temperature dependent, though their ratio is approximately constant. This structure appears to be related to the chiral nature of the molecules and may be a result of competing alignment forces, analogous to that predicted by de Gennes and Bouligand.
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页码：85 / 90
页数：6
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