Types of Colloids:

(1) On the basis of nature of interaction between dispersed phase and dispersion medium. 

(a) Lyophobic colloid- solvent , hating colloid, these colloids can not be prepared by simply mixing of dispersed phase into dispersion medium. e.g. metallic sols. 

(b) Lyophillic colloid- solvent loving these colloids can be prepared by simply mixing of dispersion phase into dispersion medium. e.g. Starch sol. 

(2) On the basis of types of particles of the dispersed phase 

(a) Multimolecular colloid- on dissolution, a large number of atoms or smaller molecules of a substance aggregate together to form species having size in colloidal range. The species thus formed are called Multimolecular colloids. e.g. Sulphur sol. 

(b) Macromolecular colloids -macromolecules are suitable solvent from solution in which size of the particles are in range of colloidal range. e.g. starch sol. 

(c) Associated colloids (micelles)- some substances in law concentration behaves as normal strong electrolyte but at higher concentration exhibit colloidal behavior due to formation of aggregates. The aggregated particles are called micelles and also known as associated colloids. 

(3) Kraft temperature- Temp. above which formation of micelles takes places. 

(4) Critical micelle concentration (cmc) - concentration above which micelle formation takes place is known as cmc.