Volume 57, Number 5, March 2002
|Page(s)||738 - 744|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Microrheology of giant-micelle solutions
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
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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