Supercritical aerogel drying technology

2021-07-21


Overview of aerogel:
Aerogel is a kind of porous nano material with high specific surface area and low bulk density. Because of its unique nanostructure, aerogel has broad application prospects in aerospace, catalysis, environmental protection and other fields. Its preparation technology has become a new field of chemical engineering research. Sol gel method is a common method to prepare aerogel, which includes three processes: sol preparation, gel preparation and gel drying.
The drying process of gel is an important process. The traditional drying method will have the following adverse effects on the preparation of aerogel: the basic particles of the material become thicker, the specific surface area is significantly reduced, and the pores are greatly reduced. The supercritical fluid drying (SCFD) technology developed in recent years will not have such adverse effects.
Because supercritical fluid has both gas and liquid properties, there is no gas-liquid interface, so there is no surface tension. At this time, there is no additional pressure generated by surface tension in the gel capillary hole. Therefore, drying gel under supercritical fluid conditions will not produce collapse of gel structure caused by additional pressure, avoiding shrinkage of gel during drying, maintaining the framework structure of gel network, and preparing ultra-fine aerogel with high specific surface area, uniform particle size distribution, and large pore volume

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