Role of Surfactants in Dispersion Methods

7sv-Asv + 7sl sl + yiv LV should be a minimum at equilibrium, leading to the well-known Young s equation. 

The contact angle 8 depends on the balance between the solid/vapour (y y) solid/liquid (y L) interfacial tensions. The angle that a drop assumes on a solid surface is the result of the balance between the adhesion force between solid and liquid and the cohesive force in the liquid, 

If there is strong interaction between solid and liquid (maximum wetting), the latter spreads until Young s equation is satisfied, 

2 Role of Surfactants in Preparation of Solid/Liquid Dispersions 1195 Vapour molecules 

The solid surface tension is lowered as a result of adsorption of vapour molecules, 

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