Banca de DEFESA: TÂNIA MARA DE OLIVEIRA DOS REIS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE: TÂNIA MARA DE OLIVEIRA DOS REIS
DATA: 08/04/2026
HORA: 09:00
LOCAL: Auditório PPGQ
TÍTULO: FERRITA DE MANGANÊS DECORADA COM NANOPARTÍCULAS DE PRATA E FUNCIONALIZADA COM ÁCIDO TÂNICO: UMA NOVA PLATAFORMA PARA SENSORIAMENTO E CATÁLISE
PALAVRAS-CHAVES: hybrid nanomaterials; manganese ferrite; silver nanoparticles.
PÁGINAS: 95
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 synthesis of the components and the hybrid nanomaterial was performed by coprecipitation and reduction methods, respectively. Characterization was conducted by UV-Visible, X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, cyclic voltammetry (CV), and differential pulse voltammetry (DPV). 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 absorption bands characteristic of M-O. Electrochemically, the hybrid material was investigated by CV and DPV. CV measurements demonstrated that the hybrid nanomaterial exhibits electron transfer behavior involving diffusion and adsorption mechanisms. These findings, combined with DPV, indicate that it can be applied to the development of electrochemical detection and processing platforms.

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 à Instituição - 027.***.***-64 - REJANE MARIA PEREIRA DA SILVA - UESPI