Abstract
Abstract We report here the modulating effects of α-cyclodextrin (α-CD) and hydroxypropyl β-cyclodextrin (HPβ-CD) on the self-assembly of a common single-tail surfactant, sodium dodecyl sulfate (SDS), in aqueous solutions. Small angle neutron scattering (SANS) data were fitted using core–shell prolate ellipsoid form factor and Hansen–Hayter-based structure factor to quantify the effects of CD type and concentration on the micelle structure and inter-micellar interactions. The presence of cyclodextrins results in decreased micelle aggregation numbers and sizes, and changes the micelle shape from ellipsoid to sphere. Further, the addition of CD reduces inter-micelle interactions through a decrease of electrostatic coupling. CDs affect the micelle properties directly, by localizing in the micelles, as well as indirectly, by driving surfactants away from the micelles into the solution due to complexation. The effect of α-CD on micelle structure is more pronounced at Cα-CD/CSDS >1 compared to the cases when Cα-CD/CSDS
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