Chemistry

Foam A dispersion of a gas in a liquid is called Foam. Ordinary soap solutions form lather which behaves like a foam if air-bubbles entrapped…

All Gels are basically Sols but all Sols are not Gels If the sol is concentrated and the discrete particles are present in a state…

Syneresis is the contraction of a gel accompanied by the separating out of the liquid. Many gels, if allowed to stand, are found to exude…

Peptization is the process by which a coagulum or a precipitate is dispersed to a colloidal state. It is the reverse process of coagulation. It…

The Electrical Double Layer The electrical properties of the colloidal state of matter and other associated phenomena may be explained in terms of the existence…

Electrophoresis is a chromatography technique by which a mixture of charged molecules is separated according to size when placed in an electric field. A simple…

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…