Banca de QUALIFICAÇÃO: ERNANI DIAS DA SILVA FILHO
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.DISCENTE : ERNANI DIAS DA SILVA FILHO
DATA : 14/10/2019
HORA: 09:00
LOCAL: auditório do Química III
TÍTULO:
Superparamagnetic gels based on polyacrylamide and magnetite
PALAVRAS-CHAVES:
Structural characterization; polymers; nanoparticles
PÁGINAS: 71
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Orgânica
ESPECIALIDADE: Polímeros e Colóides
RESUMO:
Polyacrylamide and magnetite gels are used for various applications due to their magnetic properties. Magnetite has some advantages such as low production cost and low toxicity. Such characteristics provide its use in biomedical and technological applications such as hyperthermia, drug release, effluent treatment, magnetic separation and abrasives. Thus, Superparamagnetic gels based on polyacrylamide and magnetite were synthesized by the in situ preparation of magnetite nanoparticles in physical polyacrylamide hydrogels (PAM) at different polymer concentrations. The formation of magnetite nanoparticles and their magnetic properties were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), scanning electron microscopy (SEM) and Rheology. Gels show that the main functional group of PAM (amide I and amide II) appeared in the three samples of gels synthesized with magnetite. Through the structural refinement technique by the Rietveld method showed an average size of diameters ranging from 12-16.3 nm. SEM micrographs of the gel with Fe3O4 show that the materials have spherical structures. The Rheology measurements showed that the viscosity is decreasing with the shear rate and has a behavior of a non-Newtonian fluid. Magnetic measurements show that the saturation magnetization decreases with the percentage of polyacrylamide and show superparamagnetic behavior.
MEMBROS DA BANCA:
Presidente - 1198847 - JOSE LUIS CARDOZO FONSECA
Interno - 1803692 - FABRICIO GAVA MENEZES
Externo ao Programa - 1508681 - FELIPE BOHN