Effect of Ammonia on the SiO2 Colloidal Particles Synthesized by the Stöber Method

Yun Gao Cai; Xin Qi Li

doi:10.4028/www.scientific.net/AMM.865.25

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 865Effect of Ammonia on the SiO2 Colloidal Particles...

Effect of Ammonia on the SiO₂ Colloidal Particles Synthesized by the Stöber Method

Abstract:

Various sizes SiO₂ colloidal particles in the size range of 260-950 nm were synthesized by the stöber method by adjusting the amount of ammonia from 9.0 ml to 3.0 ml while keeping 20.0 ml tetraethyl orthosilicate (TEOS), 125.0 ml ethanol, 6.0 ml ammonia and 18.0 ml distilled water fixed. In addition, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to analyze the crystallinity and morphology of the synthesized SiO₂ colloidal particles; the XRD result show that the SiO₂ colloidal particles are amorphous at room temperature; the SEM results demonstrated that the amount of ammonia could have significant effects on the size, size distribution and sphericity of the SiO₂ colloidal particles. SiO₂ colloidal particles were resulted with good monodispersity when the amount of ammonia was in the range of 6.0-90 ml, while SiO₂ colloidal particles with double size distribution were obtained when the range is 3.0-4.5 ml; on the other hand, SiO₂ spheres were resulted with good sphericity when the ammonia is in the range of 6.0-7.5 ml.

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Applied Mechanics and Materials (Volume 865)

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25-29

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https://doi.org/10.4028/www.scientific.net/AMM.865.25

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Online since:

June 2017

Authors:

Yun Gao Cai*, Xin Qi Li

Keywords:

Ammonia, SiO₂ Colloidal Particles, Size Distribution, Sphericity

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