Abstract
The small-angle X-ray scattering (SAXS) in micellar sodium dodecyl sulfate solutions has been studied in the range of overall concentrations c from 8 mM (CMC1) to 300 mM and the absolute values of scattering vector q from 0.07 to 3.0 nm–1. The total intensity of isotropic scattering has been revealed to increase with solution concentration. At c > 27 mM, the SAXS spectra have been found to exhibit an interference peak, which testifies a correlation in the arrangement of micelles in the bulk solution. This peak corresponds to the magnitude of q close to 1.55 nm–1. Using the position of this maximum, average distance r 0 between the centers of micelles has been determined, which is equal to 4.1 nm and remains almost unchanged upon an increase in the overall concentration of sodium dodecyl sulfate. The observed regularities have been explained in terms of the DLVO theory taking into account the electrostatic and molecular intermicellar interaction.
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Original Russian Text © O.G. Us’yarov, 2016, published in Kolloidnyi Zhurnal, 2016, Vol. 78, No. 5, pp. 634–641.
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Us’yarov, O.G. Small-angle X-ray scattering in sodium dodecyl sulfate solutions and micelle clustering. Colloid J 78, 698–704 (2016). https://doi.org/10.1134/S1061933X16050227
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DOI: https://doi.org/10.1134/S1061933X16050227