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Self-Alignment of Dye Molecules in Micelles and Lamellae for Three-Dimensional Imaging of Lyotropic Liquid Crystals
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2011 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 27, no 12, 7446-7452 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2011. Vol. 27, no 12, 7446-7452 p.
Keyword [en]
POLARIZING MICROSCOPY, TOPOLOGICAL DEFECTS, ANISOTROPIC FLUIDS, BILAYER-MEMBRANES, FLUORESCENCE, PHASE, ORDER, ORIENTATION, PROBES, VIVO
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-40266DOI: 10.1021/la200842zISI: 000291500700018Scopus ID: 2-s2.0-79959273246OAI: oai:DiVA.org:kth-40266DiVA: diva2:440763
Note
QC 20110913Available from: 2011-09-13 Created: 2011-09-13 Last updated: 2017-12-08Bibliographically approved

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He, Sailing

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CiteExportLink to record
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  • apa
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More styles
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  • de-DE
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