Issue |
Europhys. Lett.
Volume 57, Number 5, March 2002
|
|
---|---|---|
Page(s) | 738 - 744 | |
Section | Interdisciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i2002-00525-0 | |
Published online | 01 September 2002 |
Microrheology of giant-micelle solutions
1
Department of Physics, University of Fribourg -
CH-1700 Fribourg, Switzerland
2
GDPC, Université de Montpellier II - 34095 Montpellier Cedex 05, France
Corresponding author: Frank.Scheffold@unifr.ch
Received:
14
September
2001
Accepted:
4
December
2001
Optical tracer-microrheology has been applied to study the
rheological properties of a concentrated surfactant solution.
Under the chosen conditions these surfactants self-assemble to
form giant polymer-like micelles, resulting in a strongly
viscoelastic liquid. A novel approach to the analysis of the local
dynamic properties of tracer particles is presented, based on a
combination of single- and multi-speckle diffusing wave
spectroscopy (DWS). With this technique we could significantly
extend the accessible frequency range to the key rheological
properties as given by the loss and storage modulus,
and
. A study of the high-frequency range, not
accessible to standard techniques, shows good overall agreement
with conventional models. However, we find a distinct temperature
dependence of the characteristic modulus G0 incompatible with
the simple picture of a single relaxation process.
PACS: 82.70.Uv – Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems (hydrophilic and hydrophobic interactions) / 83.85.Ei – Optical methods; rheo-optics
© EDP Sciences, 2002
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