Precipitation of amorphous SiO2 particles and their properties
AUTOR(ES)
Musić, S., Filipović-Vinceković, N., Sekovanić, L.
FONTE
Brazilian Journal of Chemical Engineering
DATA DE PUBLICAÇÃO
2011-03
RESUMO
The experimental conditions were optimized for the synthesis of amorphous SiO2 particles by the reaction of neutralization of sodium silicate solution with H2SO4 solution. Amorphous SiO2 particles were characterized by XRD, FT-IR, FE-SEM, EDS and microelectrophoresis. The amorphous peak was located at 2θ = 21.8º in the XRD pattern. Primary SiO2 particles were ~ 15 to ~ 30 nm in size and they aggregated into bigger particles. Amorphous SiO2 particles showed a specific surface area up to 130 m²g-1, dependent on the parameters of the precipitation process. The EDS spectrum of amorphous SiO2 particles did not show contamination with sulfate or other ions, which cannot be excluded in traces. pHzpc =1.7 was obtained by microelectrophoresis.
Documentos Relacionados
- Modification of spherical SiO2 particles via electrolyte for high zeta potential and self-assembly of SiO2 photonic crystal
- INFLUENCE OF SiO2 ON MECHANICAL PROPERTIES OF DGEBA
- INFLUÊNCIA DO SIO2 NAS PROPRIEDADES MECÂNICAS DA DGEBA
- Electrical, photoelectrical and morphological properties of ZnO nanofiber networks grown on SiO2 and on Si nanowires
- Bifunctional Porous SiO2 Complex Nanoparticles with Properties of Enzymatic Catalysis and Optical Oxygen Sensing