Spatiotemporal dynamics of wormlike micelles under shear.
Velocity profiles in a wormlike micelle solution (cetyl trimethyl ammonium bromide in D2O) are recorded using ultrasound every 2 s during a startup experiment into the shear-banding regime. The stress relaxation occurs over more than 6 h and corresponds to the very slow nucleation and growth of the high-shear band. Moreover, oscillations of the interface position with a period of about 50 s are observed during the growth process. Strong wall slip, metastable states, and transient nucleation of three-band flows are also reported and discussed in light of previous experiments and theoretical models.
Bécu
Lydiane
L
Centre de Recherche Paul Pascal, Avenue Schweitzer, 33600 Pessac, France. becu@crpp-bordeaux.cnrs.fr
Manneville
Sébastien
S
Colin
Annie
A
D055592:Biophysical Phenomena; D001703:Biophysics; D008823:Micelles; D008956:Models, Chemical; D033081:Shear Strength; D013501:Surface-Active Agents / Q000737:chemistry
D008823:Micelles; D013501:Surface-Active Agents