Artículos de revistas
Nanocomposites materials generated from a spray
Fecha
2009-04-01Registro en:
Brazilian Journal of Physics. Sociedade Brasileira de Física, v. 39, n. 1a, p. 176-181, 2009.
0103-9733
10.1590/S0103-97332009000200009
S0103-97332009000200009
WOS:000267893800009
S0103-97332009000200009.pdf
2115942621694174
6446047463034654
2998503841917815
0000-0003-3286-9440
0000-0003-0195-3885
Autor
Universidade Estadual Paulista (Unesp)
Université Paul Sabatier Centre d'Elaboration de Matériaux et d'Etudes Structurales UPR
Institución
Resumen
The Spray Pyrolysis (SP) process has been employed at moderate temperature (470-970 K) for the synthesis of micro- and nano-particles of hydrated metal oxides and of related nanocomposites. It has been applied to iron nitrate solutions, without or with the addition of sodium chloride as a flux. After removal of the flux, nanocomposites of ferrihydrite (5Fe2O3,9H2O) / hematite (α- Fe2O3) / and an amorphous Fe2O3 are obtained, with surface area 140 m²/g. It has been applied also to a sol of Aluminum-tri-sec-butoxide, without or with activation by europium or terbium ions. Boehmite (γ-AlOOH) powders are synthesized at 470 K, with surface area equal to 180 m²/g. Transition alumina (γ-Al2O3) are synthesized at 970 K. Nanocomposites made by reaction of the boehmite or γ-Al2O3 particles with the amino acid asparagin (ASN) have been prepared and characterized. The luminescence of the Eu3+ or Tb3+ doped nanocomposites has been investigated: they can be considered as bio-compatible luminescent nanoparticles.