The solutions in which the diameter of particles may range from 1 to 100 nm behave as colloids.  The colloidal particles do not settle down under the force of gravity even on long standing. A colloidal system is always heterogeneous, e.g. glue, starch, albumin, gelatine, blood, soap solution, ink, clouds, smoke, etc. The solution particles are invisible to the naked eye but their scattering effect can be viewed with the help of a microscope. The solute and the solvent cannot be separated from each other by ordinary filtration, but ultra-filtration is possible. The solute particles in the colloidal solution can be made to settle by centrifugation. The solute particles in the colloidal solution do not pass through a parchment membrane, but pass through a filter paper. The colloidal solution shows Tyndall effect. The colloidal solution shows Brownian movement.

 

 

Types of Colloidal solution

Dispersed Phase	Dispersion Phase	Common name	Example
Solid	Solid	Solid Sol	Coloured gems and glasses
Solid	Liquid	Sol	Muddy water, arsenious sulphide
Solid	Gas	Aerosol	Smoke, dust storm
Liquid	Solid	Gels	Jellies, cheese
Liquid	Liquid	Emulsion	Milk, cod-liver soil
Liquid	Gas	Liquid Aerosol	Mist, fog, cloud
Gas	Solid	Solid Foam	Pumice stone, occluded gases
Gas	Liquid	Foam	Soap lather, whipped cream

 

 

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