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Surface Chemistry

Colloids:

  • Heterogeneous system
  • Intermediate between true solutions and suspensions
  • Consist of two phases – Dispersed phase and dispersion medium
  • Classification of colloids: Colloids are classified depending upon the following three criteria.

Physical state of the dispersed phase and the dispersion medium

Dispersed phase

Dispersion medium

Type of colloid

Examples

Solid

Solid

Solid sol

Gem stones, some coloured glasses

Solid

Liquid

Sol

Paints, cell fluids

Solid

Gas

Aerosol

Smoke, dust

Liquid

Solid

Gel

Cheese, butter, jellies

Liquid

Liquid

Emulsion

Milk, hair cream

Liquid

Gas

Aerosol

Fog, mist, cloud

Gas

Solid

Solid sol

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