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Emulsions and Foams

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Emulsions, Microemulsions and Foams

Part of the book series: Soft and Biological Matter ((SOBIMA))

Abstract

Emulsions are dispersions of oil and water as are microemulsions. They can be stabilized not only with surfactants but with polymers, proteins, or small particles. The role of the stabilizer is to slow down the different mechanisms of aging: gravity sedimentation/creaming, flocculation, Ostwald ripening, and coalescence. Oil–water interfacial tensions are usually about a few mN/m or larger, and dispersion entropy cannot compensate surface energy. Emulsions cannot therefore be thermodynamically stable as microemulsions (Sect. 3.3.2). They evolve with time but can eventually be stabilized kinetically, and their lifetimes can be up to years in food and cosmetic formulations. Other emulsions are much less stable, for instance, when the amount of surface-active agents is small, in which case they destabilize after minutes.

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Langevin, D. (2020). Emulsions and Foams. In: Emulsions, Microemulsions and Foams. Soft and Biological Matter. Springer, Cham. https://doi.org/10.1007/978-3-030-55681-5_4

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