The Structure of Multicomponent (Titania/Zirconia) Nanoparticles

John R Bartlett; D Gazeau; Th Zemb; J L Woolfrey

doi:10.1023/A:1008667725327

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The Structure of Multicomponent (Titania/Zirconia) Nanoparticles

Journal article

Peer reviewed

The Structure of Multicomponent (Titania/Zirconia) Nanoparticles

John R Bartlett, D Gazeau, Th Zemb and J L Woolfrey

Journal of Sol-Gel Science and Technology, Vol.13(1-3), pp.113-118

1999

DOI: https://doi.org/10.1023/A:1008667725327

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Abstract

Materials Engineering

SANS

nanoparticles

titania

zirconia

mixed oxide colloids

The local structure of titania/zirconia nanoparticles has been investigated using small-angle neutron scattering (SANS). The colloids were prepared either by hydrolyzing a mixture of titanium and zirconium alkoxides, and peptizing the resulting hydrolyzate with nitric acid (homogeneous) or hydrolyzing a titanium alkoxide, and peptizing the hydrolysate with zirconium(IV) nitrate (heterogeneous). The final titania/zirconia and metal oxide/nitrate mole ratios were 16.0 and 10.0, respectively. The nanoparticles were crystalline anatase (crystallite size ca.8 nm) and amorphous zirconia. The results of SANS contrast-variation experiments are described. The minimum-contrast points for the homogeneous and heterogeneous colloids, determined using either the known analytic form of the scattering at q = 0 or the scattering invariant, gave similar results. Significant differences from the expected value were attributed to the sorption of nitrate counter-ions and hydroxyl species on the surface of the colloids. In both cases, the scattering at minimum contrast was consistent with a fractal network of uni-dimensional zirconia, with a typical diameter of ∼1.5 nm. The results indicate that in the homogeneous colloids, the zirconia is segregated within the matrix of the titania crystallites (on ∼ 1 nm scale), whereas in the heterogeneous colloids, the zirconia is segregated on the surface of the titania crystallites (on ∼ 10 nm scale).

Details

Title: The Structure of Multicomponent (Titania/Zirconia) Nanoparticles
Authors: John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Division
D Gazeau (Author) - Service de Chimie Mol´eculaire, France
Th Zemb (Author) - Australian Nuclear Science and Technology Organisation Materials Division
J L Woolfrey (Author) - Australian Nuclear Science and Technology Organisation Materials Division
Publication details: Journal of Sol-Gel Science and Technology, Vol.13(1-3), pp.113-118
Publisher: Springer New York LLC
Date published: 1999
DOI: 10.1023/A:1008667725327
ISSN: 0928-0707
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449937902621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Materials Science, Ceramics