Precipitation of amorphous SiO2 particles and their properties

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...

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Published inBrazilian journal of chemical engineering Vol. 28; no. 1; pp. 89 - 94
Main Authors Musić, S., Filipović-Vinceković, N., Sekovanić, L.
Format Journal Article
LanguageEnglish
Portuguese
Published Brazilian Society of Chemical Engineering 01.03.2011
Subjects
ENGINEERING, CHEMICAL
Precipitated SiO2
FE-SEM
FT-IR
Microelectrophoresis
XRD
EDS
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Summary: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.
ISSN:0104-6632
1678-4383
0104-6632
DOI:10.1590/S0104-66322011000100011