Supercritical CO2 drying technology is a new chemical technology developed in recent years. Generally used drying techniques, such as room temperature drying, baking drying, etc., often inevitably lead to material agglomeration during the drying process, resulting in a thicker base material particle, a sharp drop in the specific surface area, and a large reduction in pores, which is a result of nanomaterials. The acquisition and the preparation of high specific surface materials are extremely disadvantageous.
The supercritical CO2 drying technology is drying under the critical and critical pressure conditions of the drying medium. It can avoid shrinkage and fragmentation of the materials during the drying process, thereby maintaining the original structure and state of the materials and preventing the agglomeration of the primary nanoparticles. Condensation, which is of great significance for the preparation of various nanomaterials.
Aerogel is an ultra-low-density porous solid material composed of nanoparticles or polymer molecules. It is called “frozen smoke” in foreign countries. Because aerogel has the basic properties of nanomaterials, it has a very low density. Extremely high porosity and heat-resistant and heat-insulating properties, it has broad application prospects in aerospace, catalysis, adsorption and other fields.