Superdiffusion of concentration in wormlike-micelle solutions

Ganapathy, R. ; Sood, A. K. ; Ramaswamy, S. (2007) Superdiffusion of concentration in wormlike-micelle solutions EPL : Europhysics Letters, 77 (1). 18006_1-18006_6. ISSN 0295-5075

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Our dynamic light scattering studies of viscoelastic wormlike-micelle solutions of surfactant cetyltrimethylammonium tosylate (CTAT) show superdiffusive relaxation of concentration fluctuations: relaxation rate ∼qz 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 mM to 100 mM of sodium chloride (NaCl), takes the system from the diffusion-controlled (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:Article
Source:Copyright of this article belongs to EDP Sciences.
ID Code:39886
Deposited On:19 May 2011 08:40
Last Modified:04 Oct 2011 13:40

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