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Issue 19, 2014
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Elasticity-dependent self-assembly of micro-templated chromonic liquid crystal films

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Abstract

We explore micropatterned director structures of aqueous lyotropic chromonic liquid crystal (LCLC) films created on square-lattice cylindrical-micropost substrates. The structures are manipulated by modulating the LCLC mesophases and their elastic properties via concentration through drying. Nematic LCLC films exhibit preferred bistable alignment along the diagonals of the micropost lattice. Columnar LCLC films, dried from nematics, form two distinct director and defect configurations: a diagonally aligned director pattern with local squares of defects, and an off-diagonal configuration with zig-zag defects. The formation of these states appears to be tied to the relative splay and bend free energy costs of the initial nematic films. The observed nematic and columnar configurations are understood numerically using a Landau-de Gennes free energy model. Among other attributes, the work provide first examples of quasi-2D micropatterning of LC films in the columnar phase and lyotropic LC films in general, and it demonstrates alignment and configuration switching of typically difficult-to-align LCLC films via bulk elastic properties.

Graphical abstract: Elasticity-dependent self-assembly of micro-templated chromonic liquid crystal films

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Article information


Submitted
20 Dec 2013
Accepted
06 Mar 2014
First published
07 Mar 2014

Soft Matter, 2014,10, 3477-3484
Article type
Paper

Elasticity-dependent self-assembly of micro-templated chromonic liquid crystal films

M. A. Lohr, M. Cavallaro, D. A. Beller, K. J. Stebe, R. D. Kamien, P. J. Collings and A. G. Yodh, Soft Matter, 2014, 10, 3477
DOI: 10.1039/C3SM53170H

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