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result sql = Evidence of wormlike micellar behavior in chromonic liquid crystals: rheological, X-ray, and dielectric studies.
Evidence of wormlike micellar behavior in chromonic liquid crystals: rheological, X-ray, and dielectric studies.
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result sql = We report rheological, X-ray, and dielectric investigations on a chromonic liquid-crystalline system formed by aqueous solutions of a food coloring agent, Sunset Yellow, in the absence and upon addition of salt. The salt-concentration dependence of the steady-state viscosity at low shear rates has a non-monotonic variation and is qualitatively similar to the behavior seen in wormlike micellar systems, a surprising result since chromonic systems are expected to be non-micellar in character. More interestingly, for a particular low concentration of the salt (20 mM), the viscosity increases by 3 orders of magnitude in comparison with that of the pure chromonic material. The dynamic (oscillatory) rheological data bring out features which can be described in terms of a microstructure formation. X-ray and dielectric studies show that certain characters of the aggregates formed by the Sunset Yellow molecules are not altered by the addition of salt.

Publication: J Phys Chem B 2007 Aug 23 ;111(33)::9741-6.
Publication Date: 2007 Aug 23
Study Author(s): Prasad, S Krishna;Nair, Geetha G;Hegde, Gurumurthy;Jayalakshmi, V;
Institution: Centre for Liquid Crystal Research, Jalahalli, Bangalore 560013, India. [email protected]
Shortcut link to this study:
We report rheological, X-ray, and dielectric investigations on a chromonic liquid-crystalline system formed by aqueous solutions of a food coloring agent, Sunset Yellow, in the absence and upon addition of salt. The salt-concentration dependence of the steady-state viscosity at low shear rates has a non-monotonic variation and is qualitatively similar to the behavior seen in wormlike micellar systems, a surprising result since chromonic systems are expected to be non-micellar in character. More interestingly, for a particular low concentration of the salt (20 mM), the viscosity increases by 3 orders of magnitude in comparison with that of the pure chromonic material. The dynamic (oscillatory) rheological data bring out features which can be described in terms of a microstructure formation. X-ray and dielectric studies show that certain characters of the aggregates formed by the Sunset Yellow molecules are not altered by the addition of salt.
PMID: 17661514

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