Banca de DEFESA: DYEGO MAIA DE OLIVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DYEGO MAIA DE OLIVEIRA
DATE: 17/06/2021
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

SYNTHESIS AND CHARACTERIZATION OF IRON OXIDE HOLLOW SPHERES

KEY WORDS:

hollow nanometer spheres, iron oxide, hard-template

PAGES: 60
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

In the present work we present a new route for the manufacture of hollow spheres of 142 ± 9 nm in diameter formed by iron compounds (α-Fe2O3). The new route is based on the methodology described by Yoshikawa who combined with a proposal from Kobayashi using polystyrene nanoparticles (PS) as a template. Transmission electron microscopy, Raman spectroscopy and UV-Vis analyses indicate that our intermediate system (core-shell particles) is formed by iron hydroxide (α-FeOOH) with a layer of 25 ± 4 nm supported on PS particles. At a later stage, the spheres were separated from the PS mold to form a spherical heatite shell with some traces of alpha iron hydroxide. The detection of this crystalline phase was possible using X-ray diffraction combined with Raman spectroscopy.

BANKING MEMBERS:
Presidente - 2457389 - EDUARDO PADRON HERNANDEZ
Externo à Instituição - HEBER CLAUDIUS NUNES SILVA - IFPE
Interna - 1283002 - YEDA MEDEIROS BASTOS DE ALMEIDA