SANS results for C8E4 micelles at urea concentrations of 0, 2, 4, 6 and 8 M. a), c), e) C8E4 concentration kept at 50 mM above the CMC at each urea concentration. b), d), f) C8E4 concentration fixed at 61.2 mM. a), b) Scattering spectra. c), d) p(r) curves calculated from each spectrum. e), f) Structure factors calculated for 0 M urea samples using a hard sphere potential (note expanded scale).