Ganapathy, R and Sood, AK and Ramaswamy, S (2007) Superdiffusion of concentration in wormlike-micelle solutions. In: Europhysics Letters(EPL), 77 (1). 18007-p1-18007-p5.
Superdiffusion_of_concentration.pdf - Published Version
Restricted to Registered users only
Download (417Kb) | Request a copy
Our dynamic light scattering studies of viscoelastic wormlike-micelle solutions of surfactant cetyltrimethyl ammonium tosylate (CTAT) show superdiffusive relaxation of concentration ﬂuctuations: relaxation rate $\sim q^z$ at wavenumber q, with z < 2, at concentrations just past overlap. Linear rheology experiments show that the micellar recombination kinetics in this system is diffusion-controlled (micelles break and recombine with their original partners). Addition of 10 m M to 100 m M of sodium chloride (NaCl), takes the system from the diffusion- ontrolled (DC) regime to mean-field recombination kinetics regime where micellar ends combine with ends belonging to other micelles. In the mean-field regime, the concentration ﬂuctuations decay in a purely diffusive manner. We suggest a qualitative explanation for the observed superdiffusive behaviour in the DC regime.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Institute of Physics.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||30 Nov 2007|
|Last Modified:||25 Jan 2012 04:54|
Actions (login required)