Fast Responding Robust Nematic Liquid Crystalline Gels Formed by a Monodisperse Dipeptide: Electro-Optic and Rheological Studies

Realization of mechanically robust electrically fast responding liquid crystal devices with low operating voltage is one of the current research interests. Here we report a gel system comprising a commercially available nematic liquid crystal material and a new monodisperse dipeptide liquid crystall...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2009-05, Vol.113 (19), p.6647-6651
Main Authors: Nair, Geetha G, Krishna Prasad, S, Jayalakshmi, V, Shanker, G, Yelamaggad, C. V
Format: Article
Language:English
Subjects:
B: Macromolecules, Soft Matter
Dipeptides - chemistry
Electric Impedance
Gels
Liquid Crystals - chemistry
Mechanics
Rheology
Time Factors
Viscosity
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Summary:Realization of mechanically robust electrically fast responding liquid crystal devices with low operating voltage is one of the current research interests. Here we report a gel system comprising a commercially available nematic liquid crystal material and a new monodisperse dipeptide liquid crystalline organogelator that results in these properties. The gels exhibit nearly 2 orders of magnitude faster switching response than the pure nematic liquid crystal while having 3 orders of magnitude higher zero shear rate viscosity, and with the attractive feature that the switching threshold voltage is hardly altered. Electro-optic and rheological studies of this system are described here.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp900074e