Naslov
Precipitation of amorphous SiO2 particles and their properties

Autori
Musić, Svetozar ; Filipović-Vinceković, Nada ; Sekovanić, Lavoslav

Izvornik
Brazilian journal of chemical engineering (0104-6632) 28 (2011), 1; 89-94

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
precipitated SiO2 ; XRD ; FT-IR ; FE-SEM ; EDS ; microelectrophoresis

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA