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14 . 1 Structure and Dynamics of Colloidal Solutions Studied by Small Angle Neutron Scattering and Photon Correlation Spectroscopy

Small angle neutron scattering technique has been used to study systematically the structure and interaction of ionic and zwiterionic micelles formed from ionic and polar surfactants in aqueous solutions. A recently developed theory of highly asymmetic ionic liquids has been shown to apply to dense micellar solutions where the charge density on the micellar surface is very high. Combination of the structural studies and the theoretical evaluation of the inter-micellar correlations allow an unambiguous analysis of neutron scattering data to obtain: 1) micellar aggregation number; 2) renormalized micellar charge; and 3) micellar shape, size and hydration as functions of the surfactant and salt concentrations. Thus, the micellar growth and polydisperity can be simultaneously studied.