Core-shell models do not accurately describe TX-100 micelles Figure a) shows the scattering data for C12EO10 (a) and TX-100 (b) in D 2 O at 10 mg mL -1 , at a sufficiently low concentration to avoid structure factor effects. The data for the C12EO10 micelles could be well described by a standard ellipsoidal core-shell model described in the methods. The fit results indicate prolate micelles with a core aspect ratio ϵ = 1.4 corresponding to a core with a short axis of (17 ± 2) Å and a long axis of (24 ± 3) Å. The overall micellar size was (33 ± 4) Å (short axis) with an aggregation number, Nagg, of about 97 ± 5.