Magnetic properties of NiO nanoparticles

Polarized neutron powder diffraction studies of antiferromagnetic order in bulk and nanoparticle NiO

“…High-purity platelet-shaped NiO nanoparticles with a reasonably narrow size distribution may be produced from thermal decomposition of platelet-shaped hexagonal Ni(OH) 2 particles [27][28][29][30][31]. This results in particles of cubic NiO with {111} planes as the platelet faces [31,32].…”

“…The magnetic properties of platelet-shaped NiO nanoparticles have been investigated with magnetization techniques [27][28][29][30][31][33][34][35][36], neutron scattering [17,37], and Mössbauer spectroscopy [17,29,31], revealing that the particles may undergo superparamagnetic relaxation and that they may carry a net magnetic moment. The net magnetic moment in antiferromagnetic nanoparticles is often attributed to uncompensated spins on the surface (or in the interior) of the particles and studies have found the magnetic moment of the particles to be roughly proportional to N 1/3 (N being the number of atomic spins in the particle), consistent with an uncompensated magnetic moment from random occupation of surface sites [31,38].…”

“…This method is known to produce platelet-shaped NiO particles with a thickness that depends on the annealing temperature (see, e.g., [27][28][29][30][31]). The Ni(OH) 2 precursor is produced by chemical precipitation in aqueous solutions of NaOH and Ni(NO 3 ) 2 · 6H 2 O as described in Ref.…”

Effect of Calcination Time on Structural, Optical and Antimicrobial Properties of Nickel Oxide Nanoparticles

“…Nickel oxide is a transition metal oxide, P-type semiconductor with a wide energy gap of 3.6 eV-4 eV [3]. It is used widely in manufacturing magnetic materials [4,5], alkaline battery cathodes [6], dye-sensitized solar cells, semiconductors, solid oxide fuel cells, anti-ferromagnetic layers [7], P-type transparent conducting films, electro chromic films, heterogeneous catalytic materials and gas sensors [8]. Currently some noble metal nanoparticles such as gold and silver are used as antimicrobial agents.…”

Preparation of Amino Acid Conjugated Nano-Magnetic Particles for Delivery Systems

“…Previously, we obtained monodispersive nano-magnetic particles (NMPs) with unique magnetic properties in a single step by mixing aqueous solutions of 3d transitionmetal chlorides (M Cl 2 · nH 2 O) and a sodium metasilicate nonahydrate (Na 2 SiO 3 · 9H 2 O) [19][20][21][22][23][24]. The particle size can be controlled by adjusting the annealing temperature and time.…”