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Imaging Oriented Aggregates of Lyotropic Chromonic Mesogenic Dyes by Atomic Force Microscopy

Published online by Cambridge University Press:  17 March 2011

Tod Schneider ,
Ashley Smith  and
Oleg D. Lavrentovich
Tod Schneider
Affiliation:
Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, OH 44242
Ashley Smith
Affiliation:
Work was performed during the Kent State University, Undergraduate Summer Research Program 2000 McGill University, Quebec, Montreal Canada H3A 2T5
Oleg D. Lavrentovich
Affiliation:
Chemical Physics Interdisciplinary Program and Liquid Crystal Institute, Kent State University, Kent, OH 44242
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Abstract

We use a layer-by layer electrostatic assembly technique to obtain aggregates of a chromonic mesogenic dye on mica substrates. The aqueous solutions of dye used for deposition are in the nematic phase. Atomic force microscopy of the dried films reveals that the chromonic molecules adsorb at the charged substrate in the form of ordered aggregates of elongated shape. These elongated aggregates form orientationally ordered arrays. The overall orientation of the array can be changed by shear.

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References

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