Depending upon the nature of interaction between the dispersed phase and the dispersion medium, colloids are classified in to the lyophilic colloids (solvent attracting) and lyophobic colloids (solvent repelling). If water is the dispersion medium, it is called as hydrophilic and hydrophobic colloid respectively.
Lyophilic colloids
The meaning of the word ‘lyophilic’ is ‘liquid-loving’ or ‘solvent attracting’. That means, these are colloids in which there is strong interaction between the two phases. Lyophilic colloids are those dispersions in which the dispersed phase exhibits a definite affinity for the medium and as a results extensive solvation of the colloidal particles takes place. They are directly formed by mixing the two phases.Eg :- Gum, soap, starch, gelatin, rubber etc.
These sols are also called reversible sols. Because, if the dispersion medium is separated from the dispersed phase, the sol can be reconstituted by simply mixing with the dispersion medium.
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Lyophobic colloids
The word ‘lyophobic’ means ‘liquid hating’, ie, in these sols there is little or no interaction between the two phases. Lyophobic sols are those dispersions in which there is very little attraction between dispersed phase and dispersion medium, They cannot be prepared by simply mixing the two phases. Eg :- Dispersion of metals in water, colloidal hydroxides etc.
They are irreversible in nature. Because, once precipitated, they do not given back the colloidal sol by simple addition of the dispersion medium.
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