Statics and dynamics of concentration fluctuations in nonionic micellar solutions

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Abstract
Measurements of the angular distribution of light scattered from a nonionic surfactant, C12E6, are used to obtain the divergence of the static correlation length and isothermal compressibility near the critical point. The dependence of the apparent diffusion coefficient on momentum transfer yields a dynamic correlation length which agrees closely with the static values for the temperature regime (Tc−4 °C)<T<Tc. Outside this regime the scattering measurements are consistent with micelle growth. Dynamic scaling holds for this system near Tc but a significant background contribution to the diffusion coefficient is present due to the large micelle size.