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Jeong, Joonwoo
Experimental Soft Matter Physics Lab (SOPHY)
Research Interests
  • Liquid crystals, polymers, colloids, emulsions, pattern formation, microfluidics, microfabrication, optical microscopy

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Homeotropic Alignment of Lyotropic Chromonic Liquid Crystals Using Noncovalent Interactions

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Title
Homeotropic Alignment of Lyotropic Chromonic Liquid Crystals Using Noncovalent Interactions
Author
Jeong, JoonwooHan, GangheeJohnson, A. T. CharlieCollings, Peter J.Lubensky, Tom C.Yodh, Arjun G.
Keywords
PI-PI STACKING; CARBON NANOTUBES; DISODIUM-CROMOGLYCATE; SUNSET YELLOW; WATER; AGGREGATION; GRAPHENE; PHASE; FUNCTIONALIZATION; SOLUBILIZATION
Issue Date
2014-03
Publisher
AMER CHEMICAL SOC
Citation
LANGMUIR, v.30, no.10, pp.2914 - 2920
Abstract
We report on the homeotropic alignment of lyotropic chromonic liquid crystals (LCLCs). Homeotropic anchoring of LCLCs is difficult to achieve, and this challenge has limited development of applications for LCLCs. In this work, homeotropic alignment is achieved using noncovalent interactions between the LCLC molecules and various alignment layers including graphene, parylene films, poly(methyl methacrylate) films, and fluoropolymer films. The LCLC molecules are unique in that they self-assemble via noncovalent interactions in water into elongated aggregates which, in turn, form nematic and columnar liquid crystal (LC) phases. Here we exploit these same noncovalent interactions to induce homeotropic anchoring of the nematic LCLC. Homeotropic alignment is confirmed by polarized optical microscopy and conoscopy. We also report on novel transient stripe textures that occur when an initial flow-induced planar alignment transforms into the equilibrium homeotropic alignment required by boundary conditions. An understanding of this behavior could be important for switching applications.
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DOI
10.1021/la404893t
ISSN
0743-7463
Appears in Collections:
PHY_Journal Papers
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