Dynamics of w/o AOT microemulsions studied by neutron spin echo

Abstract By using neutron spin echo and synchrotron radiation small-angle X-ray scattering, we have studied the structure and dynamics of water/sodium bis(2-ethylhexyl)sulfosuccinate/d 16 - n -heptane microemulsion with varying water/surfactant molar ratio, w 0 . We have found the anomalous q -dependence of the effective diffusion coefficient D eff at low w 0 whose peak-position at low w 0 does not satisfy the predicted relation of qR = π ( R , microemulsion radius). This would relate to the presence of the oligomeric phase at low w 0 observed by SAXS.