Tuning rheochaos by temperature in wormlike micelles

Ganapathy, Rajesh ; Sood, A. K. (2006) Tuning rheochaos by temperature in wormlike micelles Langmuir, 22 (26). pp. 11016-11021. ISSN 0743-7463

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Official URL: http://pubs.acs.org/doi/abs/10.1021/la0622020

Abstract

We investigate the critical role played by the mean micellar length during the route to rheochaos for wormlike micellar gels of surfactant cetyltrimethylammonium tosylate in the presence of salt sodium chloride that show coupling of flow to concentration fluctuations. To this end, we have carried out stress/shear rate relaxation experiments at a fixed shear rate/stress but at different temperatures to take the sample through the route to rheochaos. We see the type-II intermittency route to rheochaos in stress relaxation measurements and the type-III intermittency route to rheochaos in shear rate relaxation measurements. We have also carried out linear rheology measurements at different temperatures to estimate the mean micellar length L̅, the reptation time τrep, and the breaking time τbreak. It is shown that L̅ changes by ≈58%, as the sample goes through the route to rheochaos.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:79883
Deposited On:30 Jan 2012 05:03
Last Modified:30 Jan 2012 05:03

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