Ref.: MceSi32-027
Apresentador: Ivo Miguel Targino Bezerra
Autores (Instituição): Bezerra, I.T.(Universidade Federal do Rio Grande do Norte); Junior, A.P.(Universidade Federal do Rio Grande do Norte); Araujo, J.H.(Universidade Federal do Rio Grande do Norte); Checca, N.R.(Centro Brasileiro de Pesquisas Físicas); Nunes, M.S.(UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE); Lima, F.P.(UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE); Morales, M.A.(UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE);
Resumo:
Nanomaterials exhibit unique properties in comparison to their counterparts on larger scales. Nanoscale ferrites belong to the category of magnetic nanoparticles (NPs), arousing considerable interest due to their broad applications across various fields. In this study, nanocomposites of NiFe2O4/NiFe were synthesized through a novel methodology. The NiFe2O4 with nanoparticle size of 29.8 nm was produced by combining the ionic coordination reaction using chitosan (ICR) and hydrothermal methods, the temperature of synthesis were below 110 °C to preserve the chitosan biopolymer. Next, the ferrite was partially reduced in a thermal treatment in vacuum at 450 °C for 15 minutes. The reduction was done by the CO gas evolved from the calcination of chitosan at high temperature. The samples were investigated by X-ray diffraction, magnetometry and transmission electron microscopy. These techniques confirmed the presence of the NiFe2O4 (NFO) and FCC-Ni34Fe66 (NF) phases. The M-H measurements at 10 K exhibited a magnetic behavior typical of exchange coupled magnetic phases, suggesting the formation of NFO/NF composite.