Journal
LANGMUIR
Volume 27, Issue 12, Pages 7446-7452Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la200842z
Keywords
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Funding
- International Institute for Complex Adaptive Matter (ICAM-I2CAM)
- University of Colorado
- NSF [DMR-0645461, DMR-0820579, DMR-0847782]
- National Basic Research program of China [2004CB719800]
- Direct For Mathematical & Physical Scien [844115] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0847782] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0820579] Funding Source: National Science Foundation
- Division Of Materials Research [844115] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0755366] Funding Source: National Science Foundation
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We report alignment of anisotropic amphiphilic dye molecules within oblate and prolate anisotropic micelles and lamellae, the basic building blocks of surfactant-based lyotropic liquid crystals. Absorption and fluorescence transition dipole moments of these dye molecules orient either parallel or orthogonal to the liquid crystal director. This alignment enables three-dimensional visualization of director structures and defects in different lyotropic mesophases by means of fluorescence confocal polarizing microscopy and two-photon excitation fluorescence polarizing microscopy. The studied structures include nematic tactoids, Schlieren texture with disclinations in the calamitic nematic phase, oily streaks in the lamellar phase, developable domains in the columnar hexagonal phase, and various types of line defects in the discotic cholesteric phase. Orientational three-dimensional imaging of structures in the lyotropic cholesterics reveals large Burgers vector dislocations in cholesteric layering with singular disclinations in the dislocation cores that are not common for their thermotropic counterparts.
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