Share Email Print

Proceedings Paper

Unusual behavior of binary mixtures of ferroelectric and antiferroelectric liquid crystals with three chiral centers
Author(s): Milada Glogarova; Vladimira Novotna; Miroslav Kaspar; Vera Hamplova
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

Two binary mixtures have been studied of homologues from a series derived from 4-alkoxybiphenyl-4'-carboxylic acid with three chiral centers exhibiting ferroelectric (FE), antiferroelectric (AF) and tilted hexatic phases. One homologue exhibits a re-entrant SmC* (SmC*re) phase, which is miscible with the SmC* phase. The phase diagrams of the studied mixtures exhibit a close pocket of the SmC*A phase. The SmC*re phase is induced even in the mixtures composed from homologues without this phase. Dielectric spectroscopy reveals the Goldstone mode in both ferroelectric SmC* and the SmC*re phases, this mode being stronger when increasing concentration of the antiferroelectric homologue: In the SmC*A phase a relaxation mode is detected with the relaxation frequency three orders higher, which exhibits critical slowing down when approaching the SmC*re phase. This mode, which can be attributed to the anti-phase mode is responsible for the appearance of the SmC*re phase. In mixtures exhibiting the SmC*A phase a helix twist inversion occurs in the vicinity of the low temperature border of the AF phase.

Paper Details

Date Published: 27 June 2002
PDF: 10 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472131
Show Author Affiliations
Milada Glogarova, Institute of Physics (Czech Republic)
Vladimira Novotna, Institute of Physics (Czech Republic)
Miroslav Kaspar, Institute of Physics (Czech Republic)
Vera Hamplova, Institute of Physics (Czech Republic)

Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications
Jolanta Rutkowska; Stanislaw J. Klosowicz; Jerzy Zielinski, Editor(s)

© SPIE. Terms of Use
Back to Top