Banca de QUALIFICAÇÃO: JARDEL MENESES ROCHA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE: JARDEL MENESES ROCHA
DATA: 16/12/2024
HORA: 08:30
LOCAL: Auditório do PPGQ - UFPI
TÍTULO: Magnetic titanate nanocomposites produced from different titanium dioxide polymorphs
PALAVRAS-CHAVES: Titanium dioxide precursors; Alkaline hydrothermal process; Homojunction; Heterojunction; Magnetic nanocomposites.
PÁGINAS: 38
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
RESUMO:

This study aimed to synthesize magnetic titanate nanocomposites starting from different titanium dioxide precursors TiO₂–A  (Anatase) and TiO₂–BAR (Brookite, Anatase, and Rutile), with ionic incorporation of Co²⁺ (Co(NO₃)₂∙6H₂O) during the alkaline hydrothermal process and subsequent anchoring of FeO nanoparticles on the surface, resulting in the Co-NaTiNT(BAR)@FeO and Co-NaTiNT(A)@FeO nanocomposites, respectively. The results revealed the process of efficient homojunction (1.55% and 2.20% cobalt, respectively) and heterojunction (2.49% and 2.90% iron/FeO, respectively). Co-NaTiNT(BAR)@FeO exhibited a larger surface area, 210.46 m² g^-1, favouring a greater reduction in band gap (2.47 eV). The Co-NaTiNT(A)@FeO showed 146.65 m² g^-1 and more significant results in photoluminescence, magnetic studies, and Hyperthermia (a 38% improvement in the thermal effect). Although the magnetic nanocomposites formed from different polymorphic phases of TiO₂ showed variations in their properties, both showed potential for technological applications and even for assisting in the thermal treatment of diseases using an alternating magnetic field.

MEMBROS DA BANCA:
Presidente - 1714193 - JOSE MILTON ELIAS DE MATOS
Externo ao Programa - 704.***.***-80 - RAMON RAUDEL PEÑA GARCIA - UFRPE
Externo à Instituição - 065.***.***-56 - WAGNER ALVES CARVALHO - UFABC
Externo à Instituição - 232.***.***-08 - YURIMILER LEYET RUIZ - UFAM