Banca de QUALIFICAÇÃO: RÔMULO AUGUSTO DE OLIVEIRA PINTO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : RÔMULO AUGUSTO DE OLIVEIRA PINTO
DATA : 21/09/2023
HORA: 09:00
LOCAL: Meet
TÍTULO:

Influence of core size on physical properties of nanoparticles with core/shell structure of the CoFe2O4@NiO type.

PALAVRAS-CHAVES:

core/shell, magnetism, physical properties, 

PÁGINAS: 45
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física da Matéria Condensada
ESPECIALIDADE: Materiais Magnéticos e Propriedades Magnéticas
RESUMO:

The interest in the study of nanoparticles has been the focus of major research centers for decades.  Physical and chemical properties and their applications arouse great interest both from an academic and industrial point view. Effects such as charge mixing, superparamagnetism, high band-gap values, are always appreciated by scientists due to the wide range of applications that can be obtained in nanoparticles. However, certain characteristics are intrinsic to each particle, for example: CoFe₂O₄ nanoparticles are extremely studied due to their high magnetic anisotropy value and their applications in magnetic memory devices. Just as NiO nanoparticles are extremely studied due to their electronic applications, as it is a p-type semiconductor. Recently, research groups have been striving to create materials that have good magnetic and electrical qualities for greater applicability of these systems, such materials are called multifunctional. An example of multipurpose material is what is called a core/shell system. Where it is formed by a core with a certain physical property and a shell with a different physical property than the core. In this way, this project proposes to carry out the synthesis of nanoparticles with a core/shell structure composed of a core of CoFe₂O₄ and a shell of NiO. After the success and consolidation of the synthesis method to produce the desired system, we will make samples with different nuclei sizes, ranging between 9 and 24nm. After the production of all samples, they will be submitted to analysis of: X-Ray Diffraction (DRX), Transmission Electron Microscopy, Magnetic Measurements as a function of field and temperature, electrical measurements, and electronic transport. They will indicate the influence of the core size on the magnetic and electrical properties of core/shell of the CoFe₂O₄@NiO type and its possible applications.

MEMBROS DA BANCA:
Interno - 4260 - JOÃO MARIA SOARES
Externo à Instituição - SERGIO ANDRE FONTES AZEVEDO - UFPB
Externo à Instituição - MARCO ANTONIO MORALES TORRES - UFRN