Small-angle neutron scattering experiments have been carried out on aqueous micellar
solutions of cationic surfactants cetyltrimethylammonium bromide (CTABr),
cetyltrimethylammonium chloride (CTACl) and dodecyltrimethylammoinum bromide (DTABr)
as a function of varying surfactant concentration. It is found that while CTABr shows sphere-
to-rodlike transition of micelles with the increase in the surfactant concentration, the micelles
of CTACl and DTABr remain more or less spherical even at very high surfactant …