What are the types of colloids?

Colloids can also be classified into these categories: multimolecular colloids, macromolecular colloids, and associated colloids.

A colloid is a heterogeneous mixture that’s made up of suspended solute particles in a gas, liquid or solid dispersion medium. These are the 8 types of colloids based on the phase of the dispersed substance and the phase it is dispersed in. 

1. Sol – A colloidal suspension that consists of solid particles in a liquid medium. Examples: Paint, ink, blood
2. Solid Sol – A colloid made up of solid particles mixed with a solid medium. Examples: Glass, gemstones, colored glass
3. Gel – A semi-solid, jelly-like colloid made up of liquid particles in a solid medium. Examples: Gelatin, toothpaste, jam
4. Emulsion – A colloidal in which liquid particles combine with a liquid medium. Examples: Milk, mayonnaise brewed coffee, salad dressing, 
5. Foam – A colloidal mixture formed when gas particles are trapped in a liquid medium. Examples: Whipped cream, bubble bath, soda pop, fire retardant
6. Solid Foam – A colloidal mixture formed when gas particles combine with a solid medium. Examples: Memory foam, insulation foam, yoga mats
7. Aerosol – A colloidal mixture made up of liquid droplets dispersed in gas. Examples: Perfume, hair spray, mist, clouds, fog
8. Solid Aerosol – A colloidal mixture made up of small particles of solid dispersed in gas. Examples: Smog, smoke, volcanic ash