A double emulsion is a special case of an emulsion. In a double emulsion, a third component is added which is emulsified within the simple emulsion. Though many droplets can be formed in the middle droplet, a single droplet inside the middle droplet forms a vesicle. This is of great interest to biomedicine, cosmetics, and the food industry because such double emulsions could allow many new possibilities of substances that could be emulsified and controlled for release for applications such as flavor or drug delivery.
Soft Matter Examples
Double emulsions have been created synthetically, such as polymersomes and exist in nature, such as liposomes.