Spray Flash Evaporation Sfe Process: Identification Of The Driving Parameters On Evaporation To Tune Particle Size And Morphology

The spray flash evaporation process enables to recrystallize organic materials on submicron and nano scale and is basically based on the sudden depressurization of the solution from the superheated state to the primary vacuum through a nozzle. The immediate evaporation of the dissolved micro droplets results in the release of submicron or nanoparticles. As a first step, experimental data of recrystallization were collected for different energetic materials by varying the superheating conditions (injection temperature and pressure, solvent) and analyzing their effects on the materials properties (particle size, morphology and polymorphism). Then, the solvent spray is independently studied by measuring the velocity and the size of the generated droplets. Key parameters to master particle size and morphology are identified. This study aims to identify the flash boiling and the spray characteristics. These results pave the way to some understanding of the process to be able to tune particles size and morphology. (C) 2020 Elsevier Ltd. All rights reserved.