Issue 4, 2001

Abstract

Nanometric particles of titania, brookite and rutile polymorphs were synthesised by thermolysis of TiCl4 in concentrated HCl solutions. The Cl∶Ti molar ratio seems to be the key factor in determining the crystalline phases and their relative proportions as well as the particle size and a large proportion of brookite can be obtained under specific conditions. The complex Ti(OH)2(Cl)2(OH2)2 seems to be the precursor of the brookite phase. The presence of chloride ions is also necessary to stabilise brookite in suspension. Depending on the acidity and the ageing conditions, different morphologies of brookite nanoparticles are obtained, namely spheroidal particles or platelets. Stable sols of pure brookite are obtained by peptization of the solid phase.

Article information

Article type
Paper
Submitted
11 Jan 2001
Accepted
24 Jan 2001
First published
05 Mar 2001

J. Mater. Chem., 2001,11, 1116-1121

Synthesis of brookite TiO2 nanoparticles by thermolysis of TiCl4 in strongly acidic aqueous media

A. Pottier, C. Chanéac, E. Tronc, L. Mazerolles and J. Jolivet, J. Mater. Chem., 2001, 11, 1116 DOI: 10.1039/B100435M

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