Effects of a 10 T External Magnetic Field on the Thermal Decomposition of Fe, Ni, and Co Acetyl Acetonates

Abstract

The current investigation is centered on the thermal decomposition (700 degrees C) of acetyl acetonates of Ni, Co, and Fe in a closed reactor that was conducted by employing an external magnetic field (MF) of 10T. Interestingly, reactions of Co and Ni acetyl acetonates under a 10T MF produce Co and Ni nanoparticles (NPs) coated with carbon, while Fe acetyl acetonate produces Fe3O4 uncoated with carbon. Additionally, it is observed that all the as-formed magnetic particles tend to align in one dimension along applied MF; thus, this process can be used to fabricate large arrays of magnetic nanoparticles. The effect of an applied MF to synthesize morphologically and compositionally different products from corresponding precursors with their mesoscopic organization is the key theme of the present paper, explained with a plausible mechanism.

Solvent-Free Fabrication of Ferromagnetic Fe3O4 Octahedra

“…19 Thus, laser Raman spectroscopy represents a powerful tool for the in situ investigation of processes of oxidation. Previously, Mossbauer spectroscopy 20 was used to distinguish the difference between Fe 3 O 4 and Fe 2 O 3 .…”

Synthesis and assembly of nanomaterials under magnetic fields

“…These results indicated that the magnetic field strength also has important roles on morphologies of the product. Moreover, the thermal decomposition (700 °C) of acetyl acetonates of Ni, Co in a closed system was conducted by employing a high magnetic field of 10 T. 130 Interestingly, reactions of Co and Ni acetylacetonates under a 10 T magnetic field form Co and Ni nanoparticles coated with carbon. All the as-formed magnetic nanoparticles tend to align in 1D structure along the direction of the magnetic field.…”

Dry Autoclaving for the Nanofabrication of Sulfides, Selenides, Borides, Phosphides, Nitrides, Carbides, and Oxides

“…These experiments confirmed that indeed dry autoclaving process also showed promise for the in situ ordering of magnetic nanoparticles or can remove the carbon coating from the surface of magnetic particle due to their paramagnetic/ferromagnetic apposite interactions under applied magnetic field. With the continued interest, numerous magnetic93–95 or magnetically susceptible96–99 nanomaterials are prepared employing dry autoclaving process.…”