Silica gel with water? What is this principle?

by:Keyuan     2020-12-03
Silica gel ( 二氧化硅) Alias: silicon rubber, silicone rubber is a kind of highly active adsorption material, belongs to the crystalline substance, its chemical formula is mSiO2. nH2O. Insoluble in water and any solvents, non-toxic tasteless, stable chemical performance, in addition to the strong alkali, hydrofluoric acid does not react with any material. Various types of silicone because of the different manufacturing methods and form different microporous structure. Chemical composition and physical structure of silica gel, determines it has many other features of similar materials difficult to replace, high adsorption properties, thermal stability, chemical stability, has high mechanical strength, etc. Silica gel according to the aperture size is divided into: macroporous silica gel, coarse pore silica gel, b-type silica gel, silica. The interior of the silica gel for nanoscale microporous structure, the surface there are a lot of hydroxyl groups. Through the mutual attraction between the molecules, hydroxyl and qin affinity water molecules in the air, so as to realize water absorption. Silica gel has open porous structure and strong adsorption, can adsorption various substances. Add dilute sulphuric acid in aqueous solution of sodium silicate ( Or hydrochloric acid) And let stand, become aqueous silicate gel and cure.
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