DISTANCE DISTRIBUTION FUNCTION OF SODIUM DODECYL-SULFATE MICELLES BY X-RAY-SCATTERING

It is shon that for micellar solutions it is possible to analyze small-angle X-ray scattering curves through the distance distribution function p(r), even for relatively high concentrations, in specific cases in which the intensity curve I(q) is dominated by a peak due to the inner structure of the micelle. This allows an independent determination of the micellar form factor P(q). This procedure is compared with the conventional fitting of I(q) to the product of P(q) with the intermicellar interference function S(q), calculated from repulsive Coulomb interactions in the mean spherical approximation. p(r) functions are obtained for concentrations up to 15 wt % sodium dodecyl sulfate; micellar anisometries may be deduced from D(max) values.