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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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Publication details

The article was received on 20 Dec 2013, accepted on 06 Mar 2014, published on 07 Mar 2014 and first published online on 07 Mar 2014


Article type: Paper
DOI: 10.1039/C3SM53170H
Citation: Soft Matter, 2014,10, 3477-3484
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    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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