Colloid Guide, Meaning , Facts, Information and Description

A colloid or colloidal dispersion, is a form of matter intermediate between a true solution and a mixture (suspension). Microscopic particles of one substance, said to be in the dispersed or solute phase, are distributed throughout another, said to be in the dispersing, continuous, or solvent phase.

The field was introduced in 1861 by Scottish scientist Thomas Graham.

Colloidal sizes range from 0.001 to 1 micrometers in any dimension. Dispersions where the particle size is in this range are referred to as colloidal aerosols, colloidal emulsions, colloidal foams, or colloidal suspensions. Colloids may be colored or translucent because of the Tyndall effect. The Tyndall effect is the scattering of light by particles in the colloid.

Colloids can be classified as follows:

		Dispersed Phase
		Gas	Liquid	Solid
Dispersing Phase	Gas	None>	Liquid aerosol, Examples: fog, mist	Solid aerosol, Examples: Smoke, dust
	Liquid	Foam, Examples: Whipped cream	Emulsion, Examples: Milk, mayonnaise, hand cream	Sol, Examples: Paint, ink
	Solid	Solid foam, Examples: Styrofoam	Gel, Examples: Gelatin, jelly, cheese	Solid sol, Examples: Ruby glass

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