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We explore micropatterned director structures of aqueous lyotropic chromonicliquid crystal (LCLC) films created on square lattice cylindrical-micropostsubstrates. The structures are manipulated by modulating the LCLC mesophasesand their elastic properties via concentration through drying. Nematic LCLCfilms exhibit preferred bistable alignment along the diagonals of the micropostlattice. Columnar LCLC films, dried from nematics, form two distinct directorand defect configurations: a diagonally aligned director pattern with localsquares of defects, and an off-diagonal configuration with zig-zag defects. Theformation of these states appears to be tied to the relative splay and bendfree energy costs of the initial nematic films. The observed nematic andcolumnar configurations are understood numerically using a Landau-de Gennesfree energy model. Among other attributes, the work provide first examples ofquasi-2D micropatterning of LC films in the columnar phase and lyotropic LCfilms in general, and it demonstrates alignment and configuration switching oftypically difficult-to-align LCLC films via bulk elastic properties.

Elasticity-Dependent Self-assembly of Micro-Templated Chromonic Liquid Crystal Films