How is scCO2 Used in the Synthesis of Nanoparticles?
scCO2 is employed in the synthesis of nanoparticles through several methods:
Rapid Expansion of Supercritical Solutions (RESS): This technique involves dissolving a solute in scCO2 and rapidly expanding the solution through a nozzle, resulting in the formation of nanoparticles. Supercritical Anti-Solvent (SAS) Process: In SAS, a solution containing the material of interest is mixed with scCO2. The anti-solvent effect of CO2 leads to the precipitation of nanoparticles. Sol-Gel Process: scCO2 is used to control the hydrolysis and condensation reactions in the sol-gel process, creating highly uniform and pure nanomaterials.
