Study on Preparation of Silica Aerogel From Tetraethyl Orthosilicate and Its Properties
Porous mesh nanomaterial silica aerogel has the characteristics of low density and large specific surface area.Silica aerogel is widely used in thermal insulation materials,adsorbents,catalyst carriers and so on.In this paper,four precursors were prepared using tetraethyl orthosilicate as silicon source by controlling water quantity.Silica aerogel was synthesized in one step by different precursors under the same preparation conditions.The method has the characteristics of short process time,less solvent usage and low energy consumption.The properties of aerogel products were characterized by infrared spectroscopy,thermogravimetric analysis,X-ray diffraction and contact angle measurement.The results showed that the thermal stability of hydrophobic amorphous silica aerogel prepared with different amounts of water was different,and the appropriate amount of water could improve the thermal stability of the aerogel.
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