Effect of temperature on silica aerogel
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Increasing temperature is conducive to the collision and coagulation of sol particles, which is considered to be inversely proportional to the gel time. However, excessive temperature is likely to cause unevenness and coarseness of the structure. Therefore, the gel temperature should be lower than 70 ° C in general research.
It has been found through research that the preparation of silica aerogels at low temperatures shows that the sol-gel reaction can still proceed at low temperatures, and the time of the sol viscosity transition zone is significantly prolonged, resulting in a stable sol that can be stored for a long time and is convenient for film formation. After forming, aging and critical fluid drying, the sol is obtained without cracking, transparent, high porosity silica aerogel.
