Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 435, Issue -, Pages 8-16Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2015.12.024
Keywords
Silica-titania; Spherical particles; Stober process; Titanium peroxo complex
Funding
- Ministry of Education and Science of the Russian Federation [16.2674.2014/K]
- MINECO [MAT2013-40950-R]
- FEDER-FICyT [GRUPINI4-060]
- Russian Foundation for Basic Research [13-03-12188-ofi]
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Composite silica-titania spherical particles, from the nanometer to submicron size, have been synthesized via a new template-free method, being achieved by the reaction of aqueous titanium peroxo complex with TEOS (tetraethylorthosilicate) in aliphatic alcohols. The choice of the solvent greatly affects the growth of silica-titania particles. It has been established that size of the spheres increases as carbon chain length of alcohol extends (from methanol to n-propanol). The nanometer size SiO2-TiO2 spheres with mean diameter of about 50 nm are formed in the methanol solution, while n-propanol promotes particle growth up to 400 nm. The synthesized composites retain amorphous structure up to 500 degrees C due to the formation of Si-O-Ti heterolinkages, whose presence has been confirmed by FIR and XPS studies. (C) 2015 Elsevier B.V. All rights reserved.
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