Hierarchically Structured, Highly Porous Nickel Synthesized in Sintering–Evaporation Process from a Metal Nanopowder and a Space Holder
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Permeable (~70% porosity) nickel with a pronounced hierarchical structure was synthesized by powder metallurgy methods in sintering–evaporation process from a nickel nanopowder and an ammonium bicarbonate micropowder as a space holder. The obtained porous nickel contained pores of three spatial scales: macropores (30–50 μm in size), their connecting windows (5–10 μm), and interparticle micropores (less than 1 μm) in the walls of macropores. The produced material is characterized by a network of interpenetrating macropores and by a developed surface of their walls consisting of several layers of sintered nickel nanoparticles.
This work was supported by the Russian Science Foundation (project no. 17–03–00337-a) and the Presidium of the Russian Academy of Sciences (program no. 34P). The electron microscopy studies were supported by State Assignment no. 007–00129–18–00.
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