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  • Title: Chiral structures and defects of lyotropic chromonic liquid crystals induced by saddle-splay elasticity.
    Author: Davidson ZS, Kang L, Jeong J, Still T, Collings PJ, Lubensky TC, Yodh AG.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2015 May; 91(5):050501. PubMed ID: 26066106.
    Abstract:
    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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