Small-angle x-ray diffraction study of mixtures showing re-entrant nematic phase and induced smectic Ad phase

S. K. Giri; N. K. Pradham; R. Paul; S. Paul; P. Mandal; Roman S. Dabrowski; M. Brodzik; Krzysztof L. Czuprynski

doi:10.1117/12.301273

1 January 1998 Small-angle x-ray diffraction study of mixtures showing re-entrant nematic phase and induced smectic A_d phase

S. K. Giri, N. K. Pradham, R. Paul, S. Paul, P. Mandal, Roman S. Dabrowski, M. Brodzik, Krzysztof L. Czuprynski

Author Affiliations +

Proceedings Volume 3319, Liquid Crystals: Chemistry and Structure; (1998) https://doi.org/10.1117/12.301273
Event: Liquid Crystals, 1997, Zakopane, Poland

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 A_d 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 A_d phase is the most stable. For mixtures showing re- entrant nematic phase the order parameters were calculated.

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S. K. Giri, N. K. Pradham, R. Paul, S. Paul, P. Mandal, Roman S. Dabrowski, M. Brodzik, and Krzysztof L. Czuprynski "Small-angle x-ray diffraction study of mixtures showing re-entrant nematic phase and induced smectic A_d phase", Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); https://doi.org/10.1117/12.301273

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