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What is emulsion? What role does it plays in surface chemistry

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Emulsions are biphasic liquid systems consisting of two immiscible liquid phases. These phases are present in such as way that one phase is dispersed in the other continuous phase. Emulsions are part of a more general class of two-phase systems of matter called colloids.

Although the terms colloid and emulsion are sometimes used interchangeably, the term emulsion is used only when both the phases are in a liquid state. Examples of emulsions include mayonnaise, milk, lotions, etc. The emulsifiers form a protective film around the oil droplets dispersed in water. This prevents them to come closer and to coalesce, i.e. to combine together. Thus, the emulsion gets stabilized. For example, let us consider the role of soap which acts as an emulsifier for an oil-in-wateremulsion.


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