Issue |
Europhys. Lett.
Volume 55, Number 3, August 2001
|
|
---|---|---|
Page(s) | 432 - 438 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2001-00432-x | |
Published online | 01 December 2003 |
Shear thickening in dilute solutions of wormlike micelles
Department of Chemistry and Biochemistry, University of
California Los Angeles, CA 90095-1569, USA
Received:
6
October
2000
Accepted:
25
May
2001
A new mechanism is suggested for shear thickening in dilute solutions
of wormlike micelles. According to this mechanism, there is an
instability above a critical
shear rate, , by which
micelles aggregate
to form networks of bundles. We examine the first step of this
instability by studying the aggregation of two micelles into a paired
bundle. The model predicts that
is given by the
inverse of the time necessary for the two micelles to unbind from
each other. The order of magnitude and temperature dependence of the
predicted
are in good agreement with experimental
measurements. In addition, the model provides a natural explanation
for the observation of coexistence between the shear-induced
structure
and a dilute phase at fixed shear stress.
PACS: 83.60.Pq – Time-dependent structure (thixotropy, rheopexy) / 61.25.Hq – Macromolecular and polymer solutions: polymer melts; swelling / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc
© EDP Sciences, 2001
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