Emulsions Emulsions are the colloidal solutions in which both the dispersed phase and the dispersion medium are liquids. Emulsions are liquid-liquid colloidal systems i.e. the dispersion of finely divided droplets in another liquid. Any two immiscible liquids form an emulsion. For example: milk is a naturally occurring emulsion in which the particles (or globules) of … [Read more...] about Emulsions, Gels and Application of Colloids
Surface Chemistry
Coagulation and Protection of Colloidal Solution
Coagulation of Colloidal Solutions 1) A small amount of an electrolyte is necessary for the stability of the colloidal sol. The ions of the electrolytes are adsorbed on the sol. particles and impart them some charge; positive or negative. 2) The charged colloidal particles repel one another and are prevented from coming close together to unite into bigger particles . 3) … [Read more...] about Coagulation and Protection of Colloidal Solution
Properties of Colloidal Solution
1) Physical Properties (a) Heterogeneous Character The colloidal solutions are heterogeneous in nature consisting of two phases (1) dispersed phase and (2) dispersion medium. Because of the small particle size, the colloidal solutions generally appear to be homogeneous to the naked eye but their heterogeneity can be confirmed by seeing under electron microscope. (b) … [Read more...] about Properties of Colloidal Solution
Methods of Preparation and Purification of Colloidal Solutions
Preparation of Lyophilic Colloids The lyophilic colloids have strong affinity between particles of dispersed phase and dispersion medium. Therefore, these colloidal solutions are readily formed by simply mixing the dispersed phase and dispersion medium under ordinary conditions. For example: The substances like gelatin, gum, starch, egg albumin etc. pass readily into water … [Read more...] about Methods of Preparation and Purification of Colloidal Solutions
Classification of Colloids
Classification of Colloids The colloids are classified on the basis of the following criteria : 1) Physical state of dispersed phase and dispersion medium. 2) Natural of interactions between dispersed phase and dispersion medium. 3) Type of particles of the dispersed phase. Classification based on the Physical state of the Dispersed phase and Dispersion … [Read more...] about Classification of Colloids