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Silica gel mw is a hygroscopic solid, and is widely used in the manufacturing industry as a desiccant. It adsorbs up to 37% of its weight in moisture in high humidity environments. This makes it reusable multiple times with very little if any loss of efficiency.
A crystalline silica gel consists of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores. The voids and pores may contain water or other liquids, or they may be filled by gas or vacuum.
It is highly active and porous, with a specific surface area of more than 450 m2 per g of material. This enables silica gel to be effective as an adsorbent for liquids and gases.
There are many forms of silica gel available commercially. They range from spherical to granular particles, and are available in block and microsphere shapes.
Spherical solid silica gels have a particle size of 2.0 to 8.0 mm and have a specific surface area of 600 to 750 m 2 /g. They are mainly used for adsorption separation and purification.
Amorphous and polycrystalline solid silica gels are also available. These have an average pore size of 2.4 nm and are commonly used as a desiccant.
The chemical formula of amorphous silica gel is mSiO2*nH2O, and it is soluble in water and non-solvents other than hydrofluoric acid and strong bases. It has a high adsorption capacity and is able to separate substances with different molecular weights.
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