Distinguish between lyophilic and lyophobic colloids?
Question: Distinguish between lyophilic and lyophobic colloids?
Lyophilic and lyophobic colloids are two types of colloidal suspensions with distinct characteristics.
Lyophilic colloids, also known as reversible colloids, are colloidal systems in which the dispersed phase (colloidal particles) has a strong affinity or attraction towards the dispersing medium (solvent). The term "lyophilic" means "solvent-loving." These colloids can be easily formed by simply mixing the dispersed phase with the dispersing medium. The particles in lyophilic colloids have a high solvation capacity and form stable suspensions without the need for any additional stabilizers. Examples of lyophilic colloids include starch in water and gelatin in water.
On the other hand, lyophobic colloids, also known as irreversible colloids, are colloidal systems in which the dispersed phase has little or no affinity towards the dispersing medium. The term "lyophobic" means "solvent-fearing." These colloids are typically formed by using specialized methods such as condensation, reduction, or dispersion techniques. Unlike lyophilic colloids, lyophobic colloids require the addition of stabilizing agents or surfactants to prevent their agglomeration or coagulation. Examples of lyophobic colloids include metals like gold or silver dispersed in water or organic solvents.
In summary, the main difference between lyophilic and lyophobic colloids lies in the affinity of the dispersed phase towards the dispersing medium. Lyophilic colloids have a strong affinity and form stable suspensions without the need for additional stabilizers, while lyophobic colloids have little or no affinity and require stabilizing agents to maintain their colloidal stability.
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