2, CEA/DAM Ile de France, Bruyères-le-Châtel, , France
Last years, we have developed the synthesis of detonation nanodiamonds from nanostructured explosives. First results showed a relationship between the size of the explosive grain and the size of the synthesized nanodiamonds [1, 2]. The size of the explosive particles (RDX and TNT) were decreased down to 100-200 nm and below thanks to a spray flash evaporation process developed in the NS3E laboratory while they are usually found at the microscale. Sufficient quantities of submicron explosives could be elaborated in order to perform a complete study of different parameters such as the composition, the density, the size and the structure of the explosive charge.
The influence of these parameters will be discussed regarding the size of the obtained nanodiamonds. Overall, the nanodiamonds synthesized by using nanostructured explosives charge exhibit a smaller size and a more homogeneous size distribution than in the case of microstructured one.
These results are also analysed in order to try to understand the nanodiamond synthesis and the detonation mechanisms at a local scale. For this purpose, molecular dynamics are used in order to investigate the formation of the nanodiamonds under these extreme conditions.
 Pichot V., Risse B., Schnell F., Mory J., Spitzer D. Sci. Rep., 3, 2159, (2013).
 Pichot V., Comet M., Risse B., SpitzerD., Diamond and related Materials 54, 59-63 (2015).