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

Content Provider	Royal Society of Chemistry (RSC)
Author	Callaghan, Paul T. Raudsepp, Allan
Copyright Year	2008
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.
Starting Page	784
Ending Page	796
Page Count	13
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	4
Issue Number	4
Journal	Soft Matter
DOI	10.1039/b713416a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Plateau Cetylpyridinium chloride Brine Concentration Surfactant Shear thinning Ellipsometry Shear rate Geometry Sodium salicylate Turbidity Homodyne detection Birefringence Lever rule
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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