Elasticity of lyotropic chromonic liquid crystals probed by director reorientation in a magnetic field.

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Physical review letters, ISSN: 1079-7114, Vol: 109, Issue: 3, Page: 037801

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https://digitalcommons.kent.edu/cpippubs/69; https://digitalcommons.kent.edu/cgi/viewcontent.cgi?article=1082&context=cpippubs
10.1103/physrevlett.109.037801; 10.1103/physrevlett.109.037801.
Shuang Zhou; Yu. A. Nastishin; M. M. Omelchenko; L. Tortora; V. G. Nazarenko; O. P. Boiko; T. Ostapenko; T. Hu; C. C. Almasan; S. N. Sprunt; J. T. Gleeson; O. D. Lavrentovich Show More Hide
American Physical Society (APS); Digital Commons @ Kent State University Libraries
Physics and Astronomy; Viscoelastic properties; periodic structures; sunset yellow; phase; transition; polymers; Physics
article description
Using a magnetic Frederiks transition technique, we measure the temperature and concentration dependences of splay K1, twist K2, and bend K3 elastic constants for the lyotropic chromonic liquid crystal sunset yellow formed through noncovalent reversible aggregation of organic molecules in water. K1 and K3 are comparable to each other and are an order of magnitude higher than K2. At higher concentrations and lower temperatures, K1 and the ratios K1/K3 and K1/K2 increase, which is attributed to elongation of self-assembled lyotropic chromonic liquid crystal aggregates, a feature not found in conventional thermotropic and lyotropic liquid crystals formed by covalently bound units of a fixed length.