Banca de QUALIFICAÇÃO: TÂNIA MARA DE OLIVEIRA DOS REIS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: TÂNIA MARA DE OLIVEIRA DOS REIS
DATA: 09/12/2025
HORA: 09:00
LOCAL: Auditório PPGQ
TÍTULO: Ferrita de Manganês Decorada com Nanopartículas de Prata e Funcionalizada com Ácido Tânico: Uma Nova Plataforma para Tecnologias de Sensoriamento e Catálise
PALAVRAS-CHAVES: hybrid nanomaterials; manganese ferrite; silver nanoparticles.
PÁGINAS: 20
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Físico Química Inorgânica
RESUMO:

The growing demand for multifunctional materials with adjustable properties for detection and catalysis drives research into hybrid nanomaterials. In this context, this study aimed to develop a hybrid nanomaterial composed of manganese ferrite (MnFe₂O₄), silver nanoparticles (AgNPs), and tannic acid (TA) for application in electrochemical detection and catalysis platforms. The components and hybrid nanomaterial were synthesized by coprecipitation and reduction methods, respectively. Characterization was conducted using UV-Visible, X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), and Cyclic Voltammetry (CV) techniques. XRD and TEM analyses revealed the formation of nanoparticles with an average size of 22.7 nm and a spinel crystal structure, while TEM indicated a uniform morphology with particles in the range of 50-100 nm. Infrared spectroscopy, in turn, confirmed the formation of specific phases through the presence of characteristic absorption bands. Electrochemically, the hybrid material was investigated by cyclic voltammetry (CV). CV measurements indicated promising electrocatalytic activity, demonstrating that the hybrid nanomaterial exhibits electron transfer behavior involving diffusion and adsorption mechanisms. These findings confirm the formation of the hybrid nanomaterial and indicate its promising potential for the development of electrochemical detection platforms and efficient catalytic processes with low-cost materials.

MEMBROS DA BANCA:
Presidente - 1508806 - WELTER CANTANHEDE DA SILVA
Interno - 1714193 - JOSE MILTON ELIAS DE MATOS
Externo ao Programa - 1570906 - BARTOLOMEU CRUZ VIANA NETO
Externo ao Programa - 1780191 - FRANCISCO ERONI PAZ DOS SANTOS