define lyophilic&lyophobic colloids in chemistry
Answers
Lyophilic colloids are solvent loving particles. In other words, they have a high affinity for the liquid they are dispersed in. When these colloids are mixed with a suitable solvent, a high attraction force arises between the solvent molecules and the colloid particles. Eventually, a very stable solution is formed, which is called a lyophilic sol.
Lyophobic colloids are solvent hating colloids. There is no attraction between the colloids and the liquid. Lyophobic colloids are thermodynamically unstable. Therefore, these colloids tend to form aggregates or precipitate when added to a liquid. But the stability can be increased by adding a surface active agent to lower the interfacial energy of the system.
Answer:
(1) Lyophilic colloids : The sols in which there is a strong affinity between the dispersed phase and the dispersion medium are called lyophilic colloids.
(2) Lyophobic colloids : The sols in which there is little affinity between the dispersed phase and the dispersion medium are called lyophobic colloids.