Unusual behavior of binary mixtures of ferroelectric and antiferroelectric liquid crystals with three chiral centers

Milada Glogarova; Vladimira Novotna; Miroslav Kaspar; Vera Hamplova

doi:10.1117/12.472131

27 June 2002 Unusual behavior of binary mixtures of ferroelectric and antiferroelectric liquid crystals with three chiral centers

Milada Glogarova, Vladimira Novotna, Miroslav Kaspar, Vera Hamplova

Author Affiliations +

Proceedings Volume 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications; (2002) https://doi.org/10.1117/12.472131
Event: XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, 2001, Zakopane, Poland

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.

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Milada Glogarova, Vladimira Novotna, Miroslav Kaspar, and Vera Hamplova "Unusual behavior of binary mixtures of ferroelectric and antiferroelectric liquid crystals with three chiral centers", Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); https://doi.org/10.1117/12.472131

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