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Unusual behaviour of binary mixtures of ferroelectric and antiferroelectric liquid crystals with three chiral centres

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EN
Abstrakty
EN
Two binary mixtures have been studied of homologues from a series derived from 4-alkoxybiphenyl-4'-carboxylic acid with three chiral centres 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 of homologues without this phase. Dielectric spectroscopy reveals the Goldstone mode in both ferroelectric SmC* and the SmC*re phases, this mode being stroger 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 apperance of SmC*re phase. In mixtures exhibiting the SmC*A phase a helix twist inversion occurs in the vinicity of the low temperature border of the AF phase.
Twórcy
autor
  • Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
autor
  • Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
autor
  • Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
autor
  • Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
Bibliografia
  • 1. M. Kašpar, V. Hamplova, V. Novotna, M. Glogarova, D. Pociecha, and P. Vanek, "New series of ferroelectric liquid crystals with two or three chiral centres exhibiting antiferroelectric and hexatic phases", Liquid Crystals 28, 1203-1209 (2001).
  • 2. D. Kardas, J. Mieczkowski, D. Pociecha, J. Szydłowska, and E. Gorecka, "Synthesis and properties of a new series of mesogenic compounds with pyridine, oxidopyridinium, thienyl and furyl moieties", J. Mater. Chem. 11, 741-748 (2001).
  • 3. J. Szydłowska, D. Pociecha, E. Gorecka, D. Kardas, J. Mieczkowski, and J. Przedmojski, "New series of 4-(4'-octyloxybiphenyl-4-yloxymethyl) benzoic acid derivatives with mesogenic properties", J. Mater. Chem. 9, 361-369 (1999).
  • 4. M. Čepič and B. Žekš, "Dynamics of chiral antiferroelectric liquid materials exhibiting the S*co: phases", Liquid Crystals 20, 29-34 (1996).
  • 5. E. Gorecka, D. Pociecha, M. Glogarova, and J. Mieczkowski, "Observation of a frustrated phase in mixtures of ferroelectric and antiferroelectric liquid crystals", Phys. Rev. Lett. 81, 2946-2949 (1998).
  • 6. M. Glogarova, V. Novotna, I. Rychetsky, M. Kašpar, and V. Hamplova, "Transitions from the SmC* or SmC* A phases to the tilted hexatic phases studied by the dielectric spectroscopy", FLC 2001, Washington, to be published in Ferroelectrics.
  • 7. I. Rychetsky, D. Pociecha, V. Dvořak, J. Mieczkowski, E. Gorecka, and M. Glogarova, "Dielectric behaviour off ferroelectric liquid crystals in the vicinity of the transition into the hexatic phase", J. Chem. Phys. 111, 1541-1550 (1999).
  • 8. M. Glogarova, D. Pociecha, E. Gorecka, I. Rychetsky, and J. Mieczkowski, "Dielectric spectroscopy study of the transition into the hexatic phase in chiral smectics", Ferroelectrics 245, 712-715 (2000).
  • 9. D. Pociecha, E. Gorecka, M. Čepič, N. Vaupotič, B. Žekš, D. Kardas, and J. Mieczkowski, "Reentrant ferroelectricity in liquid crystals", Phys. Rev. Lett. 86, 3048-3051 (2001).
  • 10. P. Gisse, J. Pavel, H. T. Nguyen, and V. I. Lorman, "Dielectric permittivity in antiferroelectric liquid crystals", Ferroelectrics 147, 27-41 (1993).
  • 11. R. Blinc and B. Žekš, "Dynamics of helicoidal ferroelectric smectic-C liquid crystals", Phys. Rev. A18, 740-745 (1978).
  • 12. A. Levstik, T. Carlsson, C. Filipič, I. Levstik, and B. Žekš, "Goldstone mode and the soft mode at the smectic A-smectic C* phase transition studied by dielectric pectroscopy", Phys. Rev. A35, 3527-3534 (1987).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA2-0006-0073
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