- Emulsions are colloids where both the dispersion phase and dispersion medium are liquids. These two liquids are immiscible or partially miscible. Generally one of the liquids is water.
- There are two types of emulsions
- Oil dispersed in water (o/w type)- Water acts as dispersion medium
Example –Milk, vanishing cream
- Water dispersed in oil (w/o type)- Oil acts as dispersion medium
Example- Butter, Cream
- Emulsions like water and oil separate into two layers and make the emulsion unstable. So emulsions are stabilised by stabilising agents.
- o/w emulsions are stabilised by proteins, gum, natural and synthetic soaps
- w/o emulsions are stabilised by metal salts of fatty acids, long chain alcohols