Volume 77, Number 1, January 2007
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||10 January 2007|
Superdiffusion of concentration in wormlike-micelle solutions
Department of Physics, Indian Institute of Science - Bangalore, 560012, India
Accepted: 9 November 2006
Our dynamic light scattering studies of viscoelastic wormlike-micelle solutions of surfactant cetyltrimethylammonium tosylate (CTAT) show superdiffusive relaxation of concentration fluctuations: relaxation rate at wavenumber q, with , 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.
PACS: 82.70.Uv – Surfactants, micellar solutions, vesicles, lamellae, amphiphillic systems (hydrophilic and hydrophobic interaction) / 05.40.Fb – Random walks and Levy flights / 82.70.Gg – Gels and sols
© Europhysics Letters Association, 2007
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