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Distinction between lyophilic and lyophobic sols

Distinction between lyophilic and lyophobic Sols

 

Property Lyophilic sols (suspensoid) Lyophobic sols (Emulsoid)
Surface tension Lower than that of the medium Same as that of the medium
Viscosity Much higher than that of the medium Same as that of the medium
Reversibility Reversible Irreversible
Stability More stable Less stable
Visibility Particles can’t be detected even under ultramicroscope Particles can be detected under ultramicroscope.
Migration Particles may migrate in either direction or do not migrate in an electric field because do not carry any charge. Particles migrate either towards cathode or anode in an electric field because they carry charge.
Action of electrolyte Addition of smaller quantity of electrolyte has little effect Coagulation takes place
Hydration Extensive hydration takes place No hydration
Examples Gum, gelatin, starch, proteins, rubber etc. Metals like Ag and Au, hydroxides like , metal sulphides like etc.

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