Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5749
Title: Preparation of monodisperse silica spheres and determination of their densification behaviour
Authors: Topuz, Berna
Şimşek, Deniz
Çiftçioğlu, Muhsin
Keywords: Densification
Growth mechanism
Silica spheres
Stober process
Activation energy
Issue Date: 2014
Publisher: Elsevier Ltd.
Source: Topuz, B., Şimşek, D., and Çiftçioğlu, M. (2014). Preparation of monodisperse silica spheres and determination of their densification behaviour. Ceramics International, 41(1), 43-52. doi:10.1016/j.ceramint.2014.07.112
Abstract: Monodisperse silica spheres in the 50-520 nm size range were prepared by using the Stober process. Diffusive growth has been determined from Nielsen chronomal analysis for the 520 and 310 nm monodisperse silica spheres. The densification behaviour and evolution of the microstructure of the sphere compacts indicated an inverse dependence of shrinkage rate on the sphere size due to viscous sintering. The increase in sphere size from 50 to 500 nm shifted the densification temperature from ∼ 1120 °C to 1240 °C. The amorphous nature of the spheres was conserved up to 1200 °C where cristobalite crystal nucleation started and complete transformation to cristobalite phase has been observed upon heat treatment at 1300 °C. The activation energies for viscous sintering according to the Frenkel and Mackenzie/Shuttleworth models were calculated as 125 and 335 kJ/mol, respectively. These substantially low activation energies can be attributed to the presence of a significant level of silanol groups.
URI: https://doi.org/10.1016/j.ceramint.2014.07.112
http://hdl.handle.net/11147/5749
ISSN: 0272-8842
1873-3956
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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