Issue 4, 2008

A rheo-optical study of shear rate and optical anisotropy in wormlike micelles solutions

Abstract

The flow behaviour of wormlike micelles solutions composed of the surfactant cetylpyridinium chloride (CPCl) and counter-ion sodium salicylate (NaSal) at a molar ratio [CPCl]/[NaSal] = 2 in brine [NaCl] = 0.5 M in a cylindrical Couette geometry was examined using homodyne PCS and ellipsometry. Homodyne PCS was used to profile local shear rate and ellipsometry to concurrently profile local optical anisotropy of the fluid. Shear thinning was observed and was correlated to an increase in turbidity and a breakdown in the stress-optic law. A stress plateau observed in mechanical measurements was correlated with the partitioning of the fluid into regions of low shear rate/low turbidity/high birefringence and high shear rate/high turbidity/low birefringence. The partitioning observed was inconsistent with a simple interpretation of the lever rule.

Graphical abstract: A rheo-optical study of shear rate and optical anisotropy in wormlike micelles solutions

Article information

Article type
Paper
Submitted
03 Sep 2007
Accepted
10 Jan 2008
First published
08 Feb 2008

Soft Matter, 2008,4, 784-796

A rheo-optical study of shear rate and optical anisotropy in wormlike micelles solutions

A. Raudsepp and P. T. Callaghan, Soft Matter, 2008, 4, 784 DOI: 10.1039/B713416A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements