Chiral structures and defects of lyotropic chromonic liquid crystals induced by saddle-splay elasticity.

Phys Rev E Stat Nonlin Soft Matter Phys

Department of Physics & Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Published: May 2015

An experimental and theoretical study of lyotropic chromonic liquid crystals (LCLCs) confined in cylinders with degenerate planar boundary conditions elucidates LCLC director configurations. When the Frank saddle-splay modulus is more than twice the twist modulus, the ground state adopts an inhomogeneous escaped-twisted configuration. Analysis of the configuration yields a large saddle-splay modulus, which violates Ericksen inequalities but not thermodynamic stability. Lastly, we observe point defects between opposite-handed domains, and we explain a preference for point defects over domain walls.

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http://dx.doi.org/10.1103/PhysRevE.91.050501DOI Listing

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