Banca de DEFESA: JOSÉ CARLOS DE SOUZA CARNEIRO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : JOSÉ CARLOS DE SOUZA CARNEIRO
DATE: 24/09/2021
TIME: 14:00
LOCAL: Plataforma Google Meet
TITLE:

Synthesis of superparamagnetic magnetite nanoparticles: coated with PVP and doped with neodymium and gadolinium.

KEY WORDS:

Magnetite nanoparticles, magnetic properties, superparamagnetism, Mössbauer spectroscopy

PAGES: 183
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

The synthesis of superparamagnetic magnetite nanoparticles has been a prominent topic in the field of condensed matter research due to its applicability in biomedicine and other technologies. In this work, we describe the synthesis of nanoparticles of pure magnetite, magnetite coated with polyvinylpyrrolidone polymer (PVP), and PVP-coated magnetite doped with neodymium and gadolinium. We studied the structural and magnetic properties by X-ray diffraction (XRD), magnetization measurements (VSM), transmission electron microscopy (MET), and Mössbauer spectroscopy. The nanoparticles showed superparamagnetic behavior at room temperature. The values obtained for saturation magnetization, coercivity, and remanence indicated the superparamagnetic nature of the samples obtained. The presented approach provides an easy route to prepare PVP-coated magnetite nanoparticles, as well as ones doped with neodymium and gadolinium.

BANKING MEMBERS:
Interno - 1060742 - EDIMILSON FÉLIX DA SILVA
Externo à Instituição - IGOR FROTA DE VASCONCELOS - UFC
Presidente - 350830 - JOSE HUMBERTO DE ARAUJO
Externo à Instituição - JOÃO MARIA SOARES - UERN
Interna - 1675199 - SUZANA NOBREGA DE MEDEIROS