Spontaneous vesicle formation is observed in mixtures of anionic with cationic/zwitterionic surfactants and this process can be slowed down by addition of copolymer. Aim of the planned stopped-flow SANS experiments is to elucidate the effect of electrostatic interactions between the two surfactants, which for zwitterionic TDMAO can be tuned easily, as at lower pH it becomes protonated and thereby a cationic surfactant. By additional variation of ionic strength we will modify all relevant electrostatic parameters. Using a perfluorinated anionic surfactant we can address by contrast variation the question of how homogeneous the growing disks are. The experiments will lead to a much improved understanding of how electrostatic interactions affect this spontaneous process of vesicle formation, which is important for tailoring structure and properties of kinetically controlled vesicles.