Mechanism of the formation of the structure and phase state of binary metallic nanoparticles obtained by the electric explosion of two wires made of different metals

Impact of Incorporation of Active Nanoporous Components or Their Precursors in a CuAlO/CuAl Ceramometal Skeleton on the Properties in the Low-Temperature Water-Gas Shift Reaction

“…Such inclusions contain a large amount of copper, aluminum, and oxygen (point 2c, Table ). It is known that the particles obtained by explosion have a noticeably smaller mean size, which does not exceed 100 nm. − Presumably, in the mixing step, these particles are aggregated into big agglomerates, which are oxidized to form rounded fragments with a high content of aluminum, oxygen, and copper (point 2c, Figure ). Looseness of such agglomerates prevents the formation of strong contacts between fragments during HTT and makes it impossible to synthesize mechanically strong ceramometals from explosion powders.…”

“…As nascent nanopowders are pyrophoric after the synthesis, they were passivated by slow air leak-in. 18 , 19 …”

“…As nascent nanopowders are pyrophoric after the synthesis, they were passivated by slow air leak-in. 18,19 The reference sample was the same CuZnAl bulk oxide catalyst shaped by pressing (similar to the commercial one) and synthesized by heat treatment of the mixed Cu−Zn−Al hydroxycarbonate, 18,29 and the CuZnAl oxide catalyst initially possessed a cylindrical shape (diameter, ∼5 mm; height, ∼5 mm).…”

Synthesis of antimicrobial AlOOH–Ag composite nanostructures by water oxidation of bimetallic Al–Ag nanoparticles

“…22 Such Ag clusters of about 1 nm in radius were observed, for example, by high resolution TEM in an Al-Ag alloy quenched from 560 C. 23 In our case, the formation of a supersaturated solid solution with Ag-rich GP zones may be explained by the very rapid cooling of the Al-Ag liquid alloy formed at the high electric explosion temperature. 24 The compositionally inhomogeneous structure of the electrically exploded Ag-Al nanoparticles is conrmed by contrast uctuations observed in the TEM images in Fig. 1.…”

“…The ratio of the average particle size and the crystallite size is similar to the one reported for the electrically exploded copper and cobalt nanoparticles. 24,25 The smaller crystallite size compared to the particle size may be due to the presence of a roentgenographically amorphous surface oxide layer ( Fig. 1b), as well as to the polycrystalline structure of some Ag-Al nanoparticles.…”