Supercritical fluid drying
Supercritical fluid drying technology is a new chemical technology developed in recent years.
Commonly used drying techniques, such as room temperature drying, baking drying, etc., often inevitably cause material agglomeration during the drying process, which results in the coarser basic particles of the material, a sharp drop in the specific surface, and a large reduction in pores. This is for nanomaterials. The acquisition of high specific surface materials and the preparation of materials are extremely disadvantageous.
Supercritical fluid fluid drying technology is drying under the critical and critical pressure conditions of the drying medium. It can avoid the shrinkage and fragmentation of the material during the drying process, thereby maintaining the original structure and state of the material, and preventing the agglomeration of primary nanoparticles Consolidation, which is of great significance for the preparation of various nanomaterials.
A variety of aerogels have been successfully prepared by applying supercritical fluid drying technology.
Aerogel is an ultra-low-density porous solid material composed of nano-particles or polymer molecules as the skeleton. Because aerogel has the basic characteristics of nano-materials, it also has extremely low density, extremely high porosity, and temperature resistance. Thermal properties, so it has broad application prospects in aerospace, catalysis, adsorption and other fields.