Phase contact structures particle bridging

This polycondensation reaction may also involve the participation of aluminum salts. In this reaction, first, a sol of silicic acid or aluminosilicic acid is formed. This sol then undergoes coagulation and forms a gel, which serves as the primary coagulation structure. In the presence of supersaturation, the gel particles undergo bridging with the formation of phase contacts, and the condensation structure develops. This process is the basis for the synthesis of numerous catalysts and adsorbents. 

---