Refractory metal nanopowders: Synthesis and characterization

A study of tantalum pentoxide Ta2O5 structures up to 28 GPa

“…3,4 In the nanometer domain even nominally refractory metals such as tantalum (Ta) may be amenable to explosives and propellants applications 4 Ta and its oxidation have already been studied for example in thermite reactions. 5 Understanding and modeling the behavior and effects of metal fuels under these usage scenarios requires information on the properties of their oxides, including in particular the EOS.…”

Synthesis of tungsten nanopowders: Comparison of milling, SHS, MASHS and milling-induced chemical processes

“…Through the use of different reducer, it has been shown that the final size distribution could be tunable in the 20-300 nm range [8][9][10][11][12]. For health related problems assessment, as our powders will need to be used in cytotoxicity and genotoxicity studies, we had to avoid a potential contamination of particles by toxic reducers such as NaN 3 , LiN 3 and NaBH 4 , even though they should be fully decomposed due to the heat of the reaction.…”

“…As for SHS-based methods, one can make the distinction between pure SHS e.g. using WO 3 and Mg, NaN 3 , NaBH 4 [8,9] or Zn, together with a preheating of the reacting mixture [10,9], and mechanically induced thermitic reaction of WO 3 with Mg [11] or Li 3 N [12]. All the above mentioned papers have been a great help for the determination of our experimental protocol, and we are here aimed at studying the influence of parameters which have not been studied previously, especially the use of Mechanically Activated Self-propagating High-temperature Synthesis (MASHS) [13,14], i.e.…”

Air-exposed combustion synthesis of Al2O3 nanofibers in Al/TiO2/C system

“…More recently, salt-added combustion systems of much lower T ad have been reported in the literature, in which, the presence of salt helps the formation of products with very fine particle sizes [4][5][6][7]. SHS has recently been optimized for mass production of nanopowders [4][5][6].…”