Interaction Of C cationic surfactant, cetyl trimethyl ammonium bromide (CTAB), With pluronics F88 (EO103-PO39-EO103) and P105 (EO37-PO56-EO37) micelles and its effect oil modulating the location Of all anionic Solute in the mixed micelles have been investigated using time-resolved fluorescence and small angle neutron scattering (SANS) Studies. SANS results indicate the formation Of pluronic,CTAB supramolecular assemblies, in which the hydrophobic chains of CTAB Occupy the hydrophobic core of the pluronic micelle while the positively charged head groups reside at the micellar core-corona interface. Rotational correlation time of the anionic probe in these supramolecular assemblies increases with all increase ill the CTAB concentration, and the observed results are explained oil the basis of the probe movement from the surface to the interior of the micelle Clue to the increased electrostatic attraction. Dynamic Stokes' shift measurements also Support the movement of the probe Clue to the addition of the Surfactant to the supramolecular assemblies. From the Studies with different pluronics, it is indicated that the concentration of CTAB required to drag the probe molecule into the interior of the micelles is linearly correlated to the thickness of the corona region of the respective micelles.