The catanionic vesicles are unilamellar or multilamellar spheroid structure composed of cationic and anionic surfactant molecules assembled into bilayers. Vesicles forms by sodium dodecyl sulfate (SDS), and cetyltrimethylammonium bromide (CTAB), can form complexes with biopolymers and enter the cells via membrane. This type of vesicles undergoes a transition from multi to a unilamellar phase (MLV - ULV) at high temperature. Preliminary QENS study and differential scanning calorimetry indicated that there exists another transition related to solid gel to fluid transition, which may be responsible for the faster lateral motion in the thermally cycled sample. Aim of the proposal is to carry out a fixed window scan in heating and cooling cycle and QENS measurement at and around the transition temperatures, enabling us to correlate with the different dynamical motions.