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On the temperature dependence of the tilt and spontaneous polarization in high tilt antiferroelectric liquid crystals.

Gleeson, Helen F.; Wang, Ying; Watson, Samantha; Sahagun-Sanchez, Daniel; Goodby, John W.; Hird, Michael; Petrenko, Alex; Osipov, Mikhail A

Journal of Materials Chemistry. 2004;14:1480-1485.

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Abstract

The temp.-dependent phys. properties of four related liq. cryst. materials are reported. The materials differ chem. only in the degree of fluorination of one of the core arom. rings and all materials exhibit both chiral smectic-C (ferroelec.) and antiferroelec. liq. crystal phases. The steric tilt angles, calcd. from the layer spacing, are relatively low, satg. at a max. of 25 Deg, while the optical tilt angles are much higher, achieving values of 42.5 Deg. Most obviously, the tilt angle and spontaneous polarization exhibit very different temp. dependencies, the former appearing to be discontinuous at the orthogonal to tilted transition, while the latter follows a simple power law. This behavior was obsd. in other similar materials, but it is not in agreement with the simple coupling between spontaneous polarization and tilt that is often assumed in ferroelec. liq. crystals. A theor. explanation is given for the different temp. dependence of these two phys. quantities, suggesting that the biaxial order parameter, not directly detd. by the tilt angle, is important in these systems. [on SciFinder (R)]

Keyword(s)

Liquid crystals (antiferroelec. effect of ring fluorination on temp. dependence of tilt, phase transitions and spontaneous polarization in high tilt isooctyloxycarbonylphenyl heptafluorocarbonyloxopropyloxybiphenylcarboxylate compds.) Dipole moment (calcn. of ring-fluorinated isooctyloxycarbonylphenyl heptafluorocarbonyloxopropyloxybiphenylcarboxylate antiferroelec. liq. crystals) Antiferroelectric materials (liq.-crystal effect of ring fluorination on temp. dependence of tilt, phase transitions and spontaneous polarization in high tilt isooctyloxycarbonylphenyl heptafluorocarbonyloxopropyloxybiphenylcarboxylate compds.) Orientational order (of ring-fluorinated isooctyloxycarbonylphenyl heptafluorocarbonyloxopropyloxybiphenylcarboxylate antiferroelec. liq. crystals) Antiferroelectricity (of ring-fluorinated isooctyloxycarbonylphenyl heptafluorocarbonyloxopropyloxybiphenylcarboxylate compds.) Liquid crystals (transitions of ring-fluorinated isooctyloxycarbonylphenyl heptafluorocarbonyloxopropyloxybiphenylcarboxylate compds.)

Bibliographic metadata

Type of resource:
Content type:
Published date:
ISSN:
Volume:
14
Start page:
1480
End page:
1485
Pagination:
1480-1485
Digital Object Identifier:
10.1039/b314747a
Related website(s):
  • Related website
Access state:
Active

Institutional metadata

University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:1a4870
Created:
6th August, 2009, 10:37:45
Last modified:
1st January, 2015, 19:31:28

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