Artigo de Periódico
Synthesis and characterization of magnetic mesoporous particles
Fecha
2010Registro en:
0021-9797
v. 342
Autor
Leite, Carlos Alberto Paula
Morales, Marco A.
Mascarenhas, Artur J. S.
Gomes, Angelo M. S.
Andrade, Heloysa Martins Carvalho
Castilho, Caio Mário Castro de
Galembeck, Fernando
Leite, Carlos Alberto Paula
Morales, Marco A.
Mascarenhas, Artur J. S.
Gomes, Angelo M. S.
Andrade, Heloysa Martins Carvalho
Castilho, Caio Mário Castro de
Galembeck, Fernando
Institución
Resumen
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 nanopar-
ticles; (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 dis-cussed. 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 2.48 nm pore diameter and 1023 m2/g total area.