sol-gel synthesis
Quick Summary
The sol-gel process is a materials processing technique used to create solid materials from a liquid solution. This method involves the transition between a sol (a stable dispersion of small particles) and a gel (a gelatinous network).123
In this process, liquid precursors, often alkoxides, are hydrolyzed with water. This hydrolysis leads to the formation of network-like atomic connections, causing the mixture to gel. The gel is then dried and sintered to form a dense glass or ceramic. A key advantage of the sol-gel route is its ability to produce materials of high purity, as it avoids high-temperature reactions with containers. However, the process is slow and expensive, and it is challenging to produce large, solid pieces due to fractures that can occur during drying. This method is particularly useful for depositing thin films, such as antireflection coatings.1
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