An alternative method was developed recently affording one-step preparation of such emulsions by using blends of surfactants or amphiphilic polymers . This way is more attractive than the two-step method owing to its simplicity. However, because they are obtained by simply mixing oil and water (and emulsifiers), the aqueous inner droplet of the double emulsion has the same composition as that of the continuous phase so that encapsulation of cargos is much less efficient, mostly remaining in the outer phase. Another coming direction is the spontaneous emulsification that still proceeds in one-step and is achieved by osmose-induced diffusion of water in oil droplets. This was first observed when forming oil droplets in water stabilized by amphiphilic polymers that also contained salts, dispersed in oil, which contributed to the formation of small aqueous droplets within oil .