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Proceedings Paper

Small-angle x-ray diffraction study of mixtures showing re-entrant nematic phase and induced smectic Ad phase
Author(s): S. K. Giri; N. K. Pradham; R. Paul; S. Paul; P. Mandal; Roman S. Dabrowski; M. Brodzik; Krzysztof L. Czuprynski
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Paper Abstract

Bicomponent mixtures of 4-cyanobiphenyl-4'-yl 4- heptylbiphenyl-4-carboxylate and 4-heptyloxy-4'- cyanobiphenyl or 4-dodecyloxy-4'-cyanobiphenyl have been studied using small angle x-ray diffraction technique. The layer thickness in the induced smectic Ad phase and the apparent molecular length in the re-entrant nematic phase have been determined with temperature and concentration changes. The concentration variation of layer thickness hows a small maximum at the concentration where the smectic Ad phase is the most stable. For mixtures showing re- entrant nematic phase the order parameters were calculated.

Paper Details

Date Published: 1 January 1998
PDF: 5 pages
Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); doi: 10.1117/12.301273
Show Author Affiliations
S. K. Giri, Univ. of North Bengal (India)
N. K. Pradham, St. Joseph's College (India)
R. Paul, Univ. of North Bengal (India)
S. Paul, Univ. of North Bengal (India)
P. Mandal, Univ. of North Bengal (India)
Roman S. Dabrowski, Military Univ. of Technology (Poland)
M. Brodzik, Military Univ. of Technology (Poland)
Krzysztof L. Czuprynski, Military Univ. of Technology (Poland)


Published in SPIE Proceedings Vol. 3319:
Liquid Crystals: Chemistry and Structure
Marzena Tykarska; Roman S. Dabrowski; Jerzy Zielinski, Editor(s)

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