Xerogels are a type of solid-formed gels, which are being prepared through drying slowly at the room temperature with an unconstrained shrinkage. Xerogels generally possess the properties of higher porosity and larger surface area together with very smaller pore sizes. These are prepared by the sol–gel methodology. In the sol–gel method for the preparation of xerogels, various metal alkoxide precursors, water and ethyl alcohol, are required. These xerogel-based materials do not produce any kinds of adverse tissue reactions and also degrade to silicic acid within the body.
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