| 초록 |
An emulsion can form spontaneously when oil and aqueous phases are brought into contact without mixing if diffusion produces supersaturated compositions within a phase. For example, a drop of oil containing a surfactant and an alcohol can emulsify spontaneously when it is injected into water. This behavior is sometimes called self-emulsification and is important in applications such as use of emulsifiable concentrates for agricultural chemicals and self-emulsifying drug delivery systems. When the surfactant is initially in the oil phase, complete emulsification to form small oil droplets occurs when phase behavior is such that the injected oil is completely converted to another phase such as a microemulsion or the lamellar liquid crystal and when this phase subsequently becomes supersaturated in oil.
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