Hollow silica particles from microemulsion

Silica particles were obtained by addition of diluted soluble sodium silicate in sodium 1,2 bis (2-ethylhexyloxycarbonyl)-1-ethenesulfonate reverse microemulsions, in which aqueous phase was nitric acid solution and the water/surfactant ratio ( W) was 5 or 10. Products, whether washed or not, were d...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1999-01, Vol.247 (1), p.98-102
Main Authors: Jafelicci Jr, Miguel, Rosaly Davolos, Marian, José dos Santos, Francisco, José de Andrade, Sandro
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
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Summary:Silica particles were obtained by addition of diluted soluble sodium silicate in sodium 1,2 bis (2-ethylhexyloxycarbonyl)-1-ethenesulfonate reverse microemulsions, in which aqueous phase was nitric acid solution and the water/surfactant ratio ( W) was 5 or 10. Products, whether washed or not, were dried at 100°C and suspended in different solvents: heptane, water, kerosene or pentane for making SEM measurements. Thermal treatments of washed silica samples were carried out at 900°C and 1200°C. Silica particles of sizes from 1 to 10 μm were obtained at room temperature without changing their shape due to thermal treatment and crystallization. SEM micrographs show hollow particles suggesting that silica preferably polymerizes on microemulsion droplet interface where ionic strength of nitric acid aqueous solution is favourable for silica polymerization reaction.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(99)00040-X