Synthesis and Related Kinetics of Nanocrystalline Ni by Hydrogen Reduction of NiO

Fabrication of complex-shaped alumina/nickel nanocomposites by gelcasting process

“…The reduction behavior in similar systems has already been investigated through a systematic study of the specific processes. 17,18 Complete reduction of NiO to Ni metal in the Al 2 O 3 /NiO green body was achieved by reduction at 700 C with hydrogen gas (dew point À75 C). The morphological characteristics of the Al 2 O 3 /5vol.%Ni reduced specimen observed by TEM are shown in Fig.…”

“…The relationship between the final specimen properties and the preparation conditions is investigated through systematic fabrication of gelcast Al 2 O 3 /Ni nanocomposite under various conditions of suspension synthesis, drying, 15,16 debinding, and reduction-sintering. 17,18 2. Experimental procedures…”

<I>In-Situ</I> Kinetic Study of Hydrogen Reduction of Fe<SUB>2</SUB>O<SUB>3</SUB> for the Production of Fe Nanopowder

“…2,3) Lee and his colleagues have reported that the hydrogen reduction behavior of NiO nanopowder proceeds in a two-step process consisting of a chemical reaction and a subsequent diffusion controlled reaction. 4) Namely, the agglomerates consisting of nanosized oxide powder finally bring about a diffusion controlled reaction during the hydrogen reduction process. Therefore, it can be thought that the properties of reduced powder are strongly influenced by the reduction mechanism.…”

Síntese e caracterização de nanocompósitos Ni: SiO2 processados na forma de filmes finos

“…Nos padrões de difração de raios-X dos filmes com adição do metal foram observados os picos de difração pertencentes ao Ni metálico, caracterizado pelas reflexões de Bragg que ocorrem em 2θ ~ 44,5° e 51,7°, que correspondem aos planos (111) e (200), respectivamente 37,38 . A Figura 1 também indica a presença de uma banda larga observada em 2θ ~ 22°, atribuída à matriz de SiO 2 amorfa 39 e um pico intenso em 2θ ~ 69° correspondente ao plano (400) do substrato de Si.…”