Colloids and Emulsion

Colligative Properties All molecular colloids in solution exhibit colligative properties. Since most of these colloids have high molecular masses the depression of freezing point, elevation…

Viscosity Although the viscosity of dilute lyophobic colloids is slightly greater than the viscosity of the dispersion medium, concentrated lyophobic colloids can have quite high…

Size of colloids The particles of colloids are not of uniform size. They vary over a wide range. Lyophobic colloids, irrespective of the method of…

Shape of colloidal particles The colloids do not have any definite and uniform shape. Colloidal refers to items of a small size that are floating…

Color Property of Colloids The color of a lyophobic colloid depends not only on the color of the disperse phase but also considerably on the…

Optical Property of Colloids Colloids have some distinctive optical properties. The Tyndall phenomenon, named after Tyndall who extensively studied it, is attributed to scattering of…

Lyophilic colloids are liquid loving colloids (Lyo means solvent and philic means loving). Example: Sols of organic substances like gelatin, gum, starch, and proteins. Lyophobic…

Purification of Colloids: Dialysis and Electrodialysis After the preparation of the colloid, say, by a precipitation technique, it becomes necessary to remove the excess electrolyte…

Lyophobic and Lyophilic Sols A rough classification of sols, based on their methods of preparation, is sometimes made, e.g., association or condensation colloid, dispersion colloid…

Electrical disintegration: Bredig was the originator of disintegrating metals into sols by means of an electric arc. Two metallic electrodes dipped in water, as shown…