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  • Title: Patterning of Lyotropic Chromonic Liquid Crystals by Photoalignment with Photonic Metamasks.
    Author: Peng C, Guo Y, Turiv T, Jiang M, Wei QH, Lavrentovich OD.
    Journal: Adv Mater; 2017 Jun; 29(21):. PubMed ID: 28295687.
    Abstract:
    Controlling supramolecular self-assembly in water-based solutions is an important problem of interdisciplinary character that impacts the development of many functional materials and systems. Significant progress in aqueous self-assembly and templating has been demonstrated by using lyotropic chromonic liquid crystals (LCLCs) as these materials show spontaneous orientational order caused by unidirectional stacking of plank-like molecules into elongated aggregates. In this work, it is demonstrated that the alignment direction of chromonic assemblies can be patterned into complex spatially-varying structures with very high micrometer-scale precision. The approach uses photoalignment with light beams that exhibit a spatially-varying direction of light polarization. The state of polarization is imprinted into a layer of photosensitive dye that is protected against dissolution into the LCLC by a liquid crystalline polymer layer. The demonstrated level of control over the spatial orientation of LCLC opens opportunities for engineering materials and devices for optical and biological applications.
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