Small angle neutron scattering (SANS) measurements of D 2 O solutions (0⋅1 M) of sodium cholate (NaC) and sodium deoxycholate (NaDC) were carried out at T = 298 K. Under compositions very much above the critical micelle concentration (CMC), the bile salt micelle size growths were monitored by adopting Hayter-Penfold type analysis of the scattering data. NaC and NaDC solutions show presence of correlation peaks at Q = 0⋅12 and 0⋅1 Å-1 respectively. Monodisperse ellipsoids of the micelles produce best fits. For NaC and NaDC systems, aggregation number (9⋅0, 16⋅0), fraction of the free counterions per micelle (0⋅79, 0⋅62), semi-minor (8⋅0 Å) and semi-major axes (18⋅4, 31⋅7 Å) values for the micelles were deduced. Extent of micellar growth was studied using ESR correlation time measurements on a suitable probe incorporating NaC and NaDC micelles. The growth parameter (axial ratio) values were found to be 2⋅3 and 4⋅0 for NaC and NaDC systems respectively. The values agree with those of SANS.
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