Publication Title

Elasticity of Lyotropic Chromonic Liquid Crystals Probed by Director Reorientation in a Magnetic Field

Publication Date

7-18-2012

Document Type

Article

DOI

10.1103/PhysRevLett.109.037801

Keywords

Viscoelastic properties, periodic structures, sunset yellow, phase, transition, polymers

Disciplines

Physics

Abstract

Using a magnetic Frederiks transition technique, we measure the temperature and concentration dependences of splay K1, twistK2, 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 thanK2. 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.

Comments

Copyright 2012 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.109.037801.


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