Tuesday, November 19, 2013

Lyophobic and Lyophilic Colloids


Lyophobic Colloids:
  • Colloidal solution in which the dispersed phase has very little affinity for the dispersion medium are termed as lyophobic colloids
  • Irreversible in nature and once precipitation can not easily pass into colloidal state because particles are solvent hating.
  • They are unstable and the particles are aggregates of thousands of molecules.
  • Low concentration of dispersed phase are possible. Example. Sulphur in water.
Lyophilic Colloids:
  • Colloidal solution in which are dispersed phase has considerable affinity for the dispersion medium are called lyophilic colloids.
  • Reversible in nature and once precipitated can readily pass into colloidal state because particles are solvent loving.
  • They are stable and self stabilized.
  • Particles are true molecule and bigger size.
  • High concentration of dispersed phase are possible. Example: Gelatin, Starch and protein.

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