Eur. Phys. J. E 3, 111-121
Scattering properties of salt-free wormlike micellar solutions
M. Bellour - A. Knaebel - J.P. Munch - S.J. Candau
Laboratoire de Dynamique des Fluides Complexes, U.M.R. no. 7506,
C.N.R.S., U.L.P., 4 rue Blaise Pascal, 67070 Strasbourg Cedex,
France
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Received 21 December 1999
Abstract
Static and dynamic light scattering and conductivity
experiments were carried out on salt-free aqueous micellar
solutions of cetyltrimethylammonium n-hexane sulfonate
(
)
and cetyltrimethylammonium n-heptane sulfonate
(
)
as a function of surfactant concentration. This
study confirms the analogy between the behavior in the semi-dilute
regime of elongated micellar systems and "classical''
polyelectrolyte solutions. Time-resolved scattering experiments
performed after a variation of concentration from about twice the
overlap volume fraction 
to less than half of it revealed
the existence of a structural relaxation with a characteristic time
of several hours.
PACS
36.20.-r Macromolecules and polymer molecules -
61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling
- 82.70.-y Disperse systems
Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag
