Effect of reaction time on formation of silica core/shell particles

Processing and Application of Ceramics

Slobodanka Stanojević-Nikolić¹  Milan P. Nikolić²  Radoslav Filipović³ 

[1] Alumina Factory – Birač, Zvornik, Republic of Srpska, Bosnia and Herzegovina;Department of Chemistry and Chemical Engineering, Faculty of Agronomy Čačak, University of Kragujevac, Čačak, Serbia;Faculty of Technology, University of East Sarajevo, Zvornik, Republic of Srpska, Bosnia and Herzegovina;

关键词: core/shell particles;    silica;    assembling;    mesoporous;    reaction time;   

DOI  :  10.2298/PAC1504209N

来源: DOAJ

【 摘 要 】

The silica core/shell nanostructures were prepared by a wet-chemical process. Silica core particles were prepared by hydrolysis and condensation of tetraethylorthosilicate. The obtained particles (average size ∼0.4 µm) were used as templates for assembling of silica nanoparticles generated from highly basic sodium silicate solution. The silica core particles were functionalized with 3-aminopropyltriethoxysilane (APTES) to allow electrostatic assembling of silica nanoparticles on the surface of silica core particles. In order to find the optimal conditions for synthesis of silica core/shell particles with mesoporous shells, the effect of reaction time on formation of silica nanoparticles was investigated. The effect of process parameters on generation and aggregation of silica nanoparticles prepared from highly basic sodium silicate solution was also investigated. It was shown that the size of silica nanoparticles and tendency towards aggregation increase with increasing the reaction time and temperature. These behaviours were reflected on the formation of mesoporous silica shell around silica core particles. Thin and uniform mesoporous silica layers were obtained if reaction times were kept short. When the reaction time was prolonged, the thicker and non-uniform shells were obtained.

【 授权许可】

Unknown