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

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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Main Authors: Hegde, Gurumurthy, Prasad, S. Krishna, Nair, Geetha G., Jayalakshmi, Jayalakshmi
Format: Article
Language:English
Published: American Chemical Society 2007
Subjects:
QC Physics
Online Access: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
id ump-5431
recordtype eprints
spelling 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+
repository_type Digital Repository
institution_category Local University
institution Universiti Malaysia Pahang
building UMP Institutional Repository
collection Online Access
language English
topic QC Physics
spellingShingle 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
_version_ 1777414382245904384

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