Ammonium DiNitramide (ADN) is an interesting oxidizer to replace ammonium perchlorate in the composition of solid propellants. In this study, Spray Flash Evaporation (SFE) is presented as a new technology to enhance stability of ADN by crystallization of nanoparticles. The crystallinity and purity of the compound was confirmed by X-Ray Diffraction and Raman analysis. An average diameter of spherical particles around 32nm (solution of ethyl acetate) and 34nm (solution of methyl acetate) was measured by Scanning Electronic Microscopy (SEM). Furthermore, the downsizing to nanoscale induces a slower moisture absorption kinetic under 55% of relative humidity, a reduction of the critical diameter of detonation and the desensitization to impact.