In the RESS process, a solute is first dissolved in a supercritical fluid, typically supercritical carbon dioxide (scCO2). The solution is then passed through a nozzle, leading to rapid expansion and a dramatic drop in pressure and temperature. This results in the precipitation of the solute as fine particles. The process can be broken down into several steps:
1. Dissolution: The solute is dissolved in a supercritical fluid. 2. Expansion: The solution is rapidly expanded through a nozzle. 3. Precipitation: The solute precipitates out as nanoparticles due to the drop in solvent power.
