In situ Synthesis of Nickel Ferrite Nanoparticle/organic Hybrid

Abstract

A NiFe 2 O 4 particle/organic hybrid was synthesized in situ from iron-organic and nickel organic compounds below 100°C. A mixture of nickel (II) acetylacetonate (NA) and iron (III) 3-allylacetylacetonate (IAA) was hydrolyzed and polymerized yielding spinel oxide particle/oligomer hybrid. X-ray diffraction analysis revealed that the crystallinity of spinel particles was dependent upon the hydrolysis conditions of NA-IAA. Nanocrystalline nickel ferrite particles around 10 nm were uniformly dispersed in the organic matrix. The formation of nickel ferrite was confirmed by energy-dispersive x-ray and x-ray photoelectron spectroscopy. The saturation magnetization of hybrid increased with increasing water amount for hydrolysis. Nano-sized nickel ferrite particle/organic hybrid showed a BH curve with no remanence above 75 K. The magnetization versus H/T curves at 300, 200, and 75 K were superimposed on the same curve and satisfied the Langevin equation. The remanent magnetization and coercive field of the hybrid were 7.4 emu/g and 460 Oe, respectively, at 5 K.

Magnetic and rheological properties of monodisperse Fe3O4 nanoparticle/organic hybrid

“…To this end, syntheses of monodisperse Fe 3 O 4 nanoparticles by the thermal decomposition of metal-organics at high temperatures ranging from 200 to 300 1C have been recently reported [11][12][13]. The authors reported the syntheses of spinel ferrite particle/organic hybrids below 100 1C by using precursors with chelated Fe-O and M-O bonds, which were hydrolyzed with methylhydrazine (MH) [14][15][16]. However, the spinel particles in the hybrids had sizes of less than 10 nm, and the particles were superparamagnetic.…”