Microstructure, morphology and magnetic properties of Ni nanoparticles synthesized by hydrothermal method

Impact of mesoporous SiO2 support for Ni/polypyrrole nanocomposite particles on their capacitive performance

“…This result is coherent with the reported result for fcc metallic Ni ((PDF standard cards, JCPDS 04-0850, space group Fm 3 m ). 9,63 Identical sharp signals due to fcc cubic metallic Ni are also visible in both H 2 N-SiO 2 /Ni nanocomposite seed and H 2 N-SiO 2 /Ni/PPy nanocomposite particles (Fig. 3b and c).…”

“…9,63 Identical sharp signals due to fcc cubic metallic Ni are also visible in both H 2 N-SiO 2 /Ni nanocomposite seed and H 2 N-SiO 2 /Ni/PPy nanocomposite particles (Fig.3b and c).The average crystallite sizes of metallic Ni in H 2 N-SiO 2 /Ni and H 2 N-SiO 2 /Ni/PPy nanocomposites are 22.7 and 30.0 nm, respectively. The extended broad signal, averages at around 221, appears in both nanocomposites and can be assigned to amorphous SiO 2 and PPy.…”

Study of an Oil Based Magnetorheological Fluid With Ni Nanoparticles

“…La saturación magnética medida es M s = 50.8 emu/g, el magnetismo remanente M r = 9.4 emu/g, y el campo coercitivo, H c = 145 Oe. Valores similares para la magnetización de saturación y el campo coercitivo se encontraronpara nanopartículas de Ni preparadas por el método hidrotérmico y el mismo precursor de cloruro [13]. La Tabla 1 resume estas características magnéticas y las compara con las del Ni en tamaño macroscópico o masivo (bulk).…”

Low temperature hydrothermal synthesis of Ni75Fe25 nanostructured powders: Microstructure, morphology and magnetic behaviour

“…Until now, several methods have been used to produce NiFe NPs with diverse morphologies and size distributions [15][16][17][18][19][20]. The hydrothermal method is particularly interesting because of its low cost, surfactant-free procedure and simplicity, but also because there are multiple parameters that can be optimized during the synthesis process in order to modify the shape and size of the nanoparticles and consequently their magnetic properties [21][22][23][24]. Nevertheless, the hydrothermal route (i.e, the coreduction of nickel and iron salts) to obtain binary NiFe alloys is not free from complications because the transformation of the iron salts into stable hydroxides that are difficult to reduce must be avoided.…”