Advanced Materials

Pillar-Assisted Epitaxial Assembly of Toric Focal Conic Domains of Smectic-A Liquid Crystals

Authors

  • Apiradee Honglawan,

    1. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Towne Building, 220 South 33rd Street, Philadelphia, PA 19104, USA
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  • Daniel A. Beller,

    1. Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, USA
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  • Marcello Cavallaro,

    1. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Towne Building, 220 South 33rd Street, Philadelphia, PA 19104, USA
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  • Randall D. Kamien,

    Corresponding author
    1. Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, USA
    • Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia, PA 19104, USA
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  • Kathleen J. Stebe,

    1. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Towne Building, 220 South 33rd Street, Philadelphia, PA 19104, USA
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  • Shu Yang

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Towne Building, 220 South 33rd Street, Philadelphia, PA 19104, USA
    2. Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104, USA
    • Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Towne Building, 220 South 33rd Street, Philadelphia, PA 19104, USA.
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Abstract

SU-8 pillar-assisted epitaxial assembly of toric focal conic domains (TFCDs) arrays of smectic-A liquid crystals is studied. The 3D nature of the pillar array is crucial to confine and direct the formation of TFCDs on the top of each pillar and between neighboring pillars, leading to highly ordered square and hexagonal array TFCDs. Excellent agreement between the experimentally obtained critical pillar diameter and elasticity calculation is found.

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