Synthesis and characterization of magnetic mesoporous particles.
Magnetic mesoporous particles were synthesized and their magnetic and structural properties are reported. The synthesis procedure consists of four steps: (i) preparation of magnetite colloidal nanoparticles; (ii) growth of a silica layer; (iii) development of the mesoporous structure and (iv) template removal. Two different methods for the template removal were studied and their effectiveness was discussed. Magnetization and Mössbauer spectroscopy measurements showed superparamagnetic behavior for the particles at room temperature. X-ray diffraction and nitrogen adsorption measurements showed a mesoporous MCM-41 structure with 2.48nm pore diameter and 1023m(2)/g total area.
Morales
Marco A
MA
Instituto de Física, Universidade Federal da Bahia (UFBA), Campus Universitário da Federação/Ondina, 40210-340 Salvador, BA, Brazil.
Mascarenhas
Artur J S
AJ
Gomes
Angelo M S
AM
Leite
Carlos A P
CA
Andrade
Heloysa M C
HM
de Castilho
Caio M C
CM
Galembeck
Fernando
F