Publication Title

Physical Review Letters

Publication Date

11-16-2007

Document Type

Article

DOI

10.1103/PhysRevLett.99.207801

Keywords

B-7 mesophase, electrooptical properties, helical superstructures, homologous series, achiral molecules, phase-transition, smectic phase, mesogens, substituents, symmetry

Disciplines

Physics

Abstract

We show how frustrations in molecular packing generated by molecular substitutions and electrostatic potentials necessitate a local C(1) symmetry and lead to spontaneous polarization splay and layer bending in bent-core liquid crystals. By estimation of the entropic changes due to curvature, we calculated the elastic constants that drive the spontaneous layer bend and polarization splay and obtained length scales of these deformations. Finally, we propose a structural phase diagram which describes how the experimentally observed helical superstructures, layer undulation, polarization splay, and spontaneous fiber formation depend on the direction and magnitude of the spontaneous polarization.

Comments

Copyright 2007 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.99.207801


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