Preferential adsorption of ions on their surface from the solution

Preferential adsorption of solvent on their surface from the solution

Attraction between different particles having opposite charges on their surface

Potential difference between the fixed layer and the diffused layer of opposite charges around the colloidal particles.

Adsorption is always exothermic

Physisorption may transform into chemisorption at high temperature

Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature

Chemisorption is more exothermic than physisorption, however it is very slow due to higher energy of activation