| Issue |
Europhys. Lett.
Volume 54, Number 5, June 2001
|
|
|---|---|---|
| Page(s) | 605 - 611 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2001-00335-x | |
| Published online | 01 December 2003 | |
Shear-induced micellar growth in dilute surfactant solutions
1
Unité Mixte de Recherche CNRS/Université de
Montpellier II No. 5581 Groupe de
Dynamique des Phases Condensées - F-34095
Montpellier Cedex 05, France
2
Institut Laue-Langevin - BP 156, F-38042 Grenoble
cedex 9, France
Corresponding author: jberret@us.rhodia.com.
Received:
5
December
2000
Accepted:
29
March
2001
The shear-thickening transition observed in aqueous solutions of
cetyltrimethylammonium tosylate (CTAT) is investigated using
rheology and small-angle neutron scattering under shear. Above a
critical shear rate 
, the increase of the
apparent shear viscosity is due to the formation of a
shear-induced phase. Using a Porod representation to analyze the
aggregate local morphology, we demonstrate that the shear-induced
viscous state consists of cylindrical micelles strongly aligned
in the flow. We also investigate the shear rate and surfactant
concentration dependencies of the structure factor peak revealed
at low wave vectors. Above , the systematic
shift of the structure factor peak to lower wave vectors is
interpreted in terms of the shear-induced micellar growth of the
aggregates.
PACS: 47.50.+d – Non-Newtonian fluid flows / 83.60.Rs – Shear rate-dependent structure (shear thinning and shear thickening) / 83.85.Hf – X-ray and neutron scattering
© EDP Sciences, 2001
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