![]() In a colloidal gel, the network is built from agglomerates of colloidal particles. A “gel” is formed by a three-dimensional continuous network, which contains a liquid phase, or by the joining of polymer chains. The process begins with the formation of a “sol,” which is a stable dispersion of colloidal particles (amorphous or crystalline) or polymers in a solvent. In particular, films are the most important from the technological point of view. Sol-gel samples can be designed with a wide variety of morphologies, such as monoliths, films, fibers, and powders. Among the advantages of using the sol-gel process in the synthesis is because it can be carried out at room temperature, it allows us to produce a wide range of novel and functional materials, with potential applications in different areas and finally, it is really attractive compared to other methods, due to its low production costs.
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