On the concentration-induced growth of nonionic wormlike micellesS. Bulut1, J. Hamit1, U. Olsson1 and T. Kato2
1 Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O.Box 124, SE-22100, Lund, Sweden
2 Department of Chemistry, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, 192-0397, Tokyo, Japan
Received 18 March 2008 / Revised version 9 September 2008 / Published online 30 October 2008
We present a comprehensive study of the concentration-induced growth of nonionic wormlike micelles in dilute solutions, below the overlap concentration, where we combine static and dynamic light scattering and NMR self-diffusion. The data are analyzed in detail in terms of the number-averaged contour length, assuming an exponential size distribution, as predicted by theory, and that the micellar flexibility can be described by the wormlike chain model with a certain persistence length. A very good agreement between the different experimental methods is obtained. The number-averaged contour length increases with increasing micelle volume fraction. The data are consistent with a power law, where the power law exponent is in the range 0.5-0.8, depending on the system. The result is in reasonable agreement with the theory of living polymers.PACS
64.75.Yz - Self-assembly.
82.70.Uv - Surfactants, micellar solutions, vesicles, lamellae, amphiphilic systems, (hydrophilic and hydrophobic interactions).
82.56.Lz - Diffusion. Correspondence: Sanja.Bulut@fkem1.lu.se
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2008