Abstract
The effect of β-cyclodextrin (β-CD) on cetyltrimethylammonium bromide (CTAB) micellar properties was studied by the determination of the diffusion coefficient, D. When the CTAB micelles have a spherical structure, D firstly increased and then remained unchanged, while the micellar aggregation number, N, decreased with the addition of β-CD. When the CTAB concentration was less than the first critical micellar concentration, CTAB molecules could be included into β-CD cavities with the molar ratio of CTAB to β-CD being about 1:1. However, when the CTAB concentration was higher than the first critical micellar concentration, mixed spherical micelles were formed with the molar ratio of CTAB to β-CD being 9:1.
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