| 초록 |
The scope of nano-technology with supercritical fluids has been enlarged by Rapid Expansion of Supercritical Solution and Supercritical Anti Solvent processes, which are complementary to each other. The principle of these processes is based on the super saturation of solution that is followed by the nucleation of solute. However, in addition to the capability of supercritical CO2 to dissolve solutes, they have the great difference in terms of the growth of nuclei. A lot of works have investigated the effects of operating conditions, shapes of nozzle, and geometry of these processes devices. Results of these works have showed the possibility of supercritical fluids technologies as an alternative way to replace many traditional size-reduction methods in various areas. But, there ever exists discrepancy even between the same processes, up to which system is used and how to set up devices. This study is intended to examine the mechanism of these processes and inspect what has not been approached so far. In this work, we used PLA and acetylsalicylic acid as a solute with continuous RESS and ASES process. |
