Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies
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...
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ump-54312018-05-18T01:33:29Z http://umpir.ump.edu.my/id/eprint/5431/ Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies Hegde, Gurumurthy Prasad, S. Krishna Nair, Geetha G. Jayalakshmi, Jayalakshmi QC Physics 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. American Chemical Society 2007-06-22 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/5431/1/J.Phys_Chem_B.pdf Hegde, Gurumurthy and Prasad, S. Krishna and Nair, Geetha G. and Jayalakshmi, Jayalakshmi (2007) Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies. Journal of Physical Chemistry B, 111 (33). pp. 9741-9746. ISSN 1520-6106 (print); 1520-5207 (online) http://pubs.acs.org/doi/pdf/10.1021/jp073190%2B DOI: 10.1021/jp073190+ |
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QC Physics Hegde, Gurumurthy Prasad, S. Krishna Nair, Geetha G. Jayalakshmi, Jayalakshmi Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies |
description |
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. |
format |
Article |
author |
Hegde, Gurumurthy Prasad, S. Krishna Nair, Geetha G. Jayalakshmi, Jayalakshmi |
author_facet |
Hegde, Gurumurthy Prasad, S. Krishna Nair, Geetha G. Jayalakshmi, Jayalakshmi |
author_sort |
Hegde, Gurumurthy |
title |
Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies |
title_short |
Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies |
title_full |
Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies |
title_fullStr |
Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies |
title_full_unstemmed |
Evidence of Wormlike Micellar Behavior in Chromonic Liquid Crystals: Rheological, X-ray, and Dielectric Studies |
title_sort |
evidence of wormlike micellar behavior in chromonic liquid crystals: rheological, x-ray, and dielectric studies |
publisher |
American Chemical Society |
publishDate |
2007 |
url |
http://umpir.ump.edu.my/id/eprint/5431/ http://umpir.ump.edu.my/id/eprint/5431/ http://umpir.ump.edu.my/id/eprint/5431/ http://umpir.ump.edu.my/id/eprint/5431/1/J.Phys_Chem_B.pdf |
first_indexed |
2023-09-18T22:00:45Z |
last_indexed |
2023-09-18T22:00:45Z |
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1777414382245904384 |