when they are dispersed in an apolar solvent. Note that the size of a reverse aggregate is related to the spontaneous curvature H similarly as for ordinary

Owing to the rather subtle variations of the various local free energies upon changing the surface area per head group, the curvature, and the solution parameters, it is generally a delicate matter to predict what detailed shape is going to predominate in the end. Moreover, the occurrence of long rod-shaped micellar aggregates (and large vesicles) as the favored kinds of aggregates is mostly due to the size fluctuations becoming thermodynamically important as an additional source of entropy. Thus, neither the CPP parameter nor the notion of a spontaneous curvature constitutes a sufficient basis for accurately predicting aggregate geometries.