Of course, such molecules self-assemble in water due to their special molecular structure where two spatially distinct moieties, having very contrasting affinities to water, are linked together by a strong chemical bond: supramolecular aggregates then form in water consisting of a hydrophobic core covered by the hydrophilic head-groups. Indeed, such a micro-segregation mechanism imposes no strong restriction on the shape of the aggregate formed: as a matter of fact, the concentrated parts of the phase diagrams show a large variety of distinct mesophases consisting of globules, cylinders or bilayers periodically arranged in space so as to exhibit various orientational and translational long-range orders that are easily characterized by X-rays or neutron diffraction [1 ].