Experimental evidence of a conic helical liquid crystalline structure in cylindrical microcavities
作者:
H. Schmiedel,
R. Stannariu,
G. Feller,
Ch. Cramer,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 17,
issue 3
页码: 323-332
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408036573
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Optical activity has been measured for cholesteric (Ch), twisted nematic (N*) and ferroelectric (S*c) substances confined in cylindrical channels of anodic oxidized aluminium (Anoporemembranes).1H and13CNMR studies of the adsorbed N* phase in combination with measurements of the rotary power suggest a conic helical director field in the pores, as in a common S*cstructure, with the helical axes oriented along the cylindrical channels and the helicoidally ordered local directors on average being inclined at an angleθ< 90° to the cylinder axes. Supposing the validity of the de Vries formula, the sign and magnitude of the optical activity in Anopore indicate a change in birefringence and pitch with respect to the bulk sample.
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