Influence of β-diketones on the hydrolysis and growth of particles from zirconium(IV) n-propoxide

M J Percy; John R Bartlett; L Spiccia; B O West; J L Woolfrey

doi:10.1023/A:1008781515324

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Influence of β-diketones on the hydrolysis and growth of particles from zirconium(IV) n-propoxide

Journal article

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Influence of β-diketones on the hydrolysis and growth of particles from zirconium(IV) n-propoxide

M J Percy, John R Bartlett, L Spiccia, B O West and J L Woolfrey

Journal of Sol-Gel Science and Technology, Vol.19(1-3), pp.315-319

2000

DOI: https://doi.org/10.1023/A:1008781515324

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Abstract

Materials Engineering

zirconia

precursor chemistry

particle growth

β-diketones

The influence of low ligand/Zr mole ratios (Ï = 0-0.1) on the hydrolysis and growth of oligomers from Zr(OnPr)4 modified with a series of β-diketones (trifluoroacetylacetone, hexafluoroacetylacetone, benzoylacetone, dibenzoylmethane and dipivaloylmethane), and their subsequent aggregation to form uniform, dense spheres, has been investigated by light scattering and turbidometry. The addition of β-diketones results in a large increase in the induction time, ti (reduction in hydrolysis/condensation rates). A remarkable feature of the data is the dramatic reductions in rate observed even when a maximum of one in forty Zr-OR bonds have been replaced by the β-diketone and are no longer available for hydrolysis or further condensation. The largest effect is observed with dibenzoylmethane, which increases ti by a factor of 26 relative to acetylacetone. A mechanism rationalising the origin of the effect is discussed, which involves segregation of the β-diketone ligands on the surface of the growing particle, with subsequent particle growth restricted to those sites not occupied by the chelating ligands.

Details

Title: Influence of β-diketones on the hydrolysis and growth of particles from zirconium(IV) n-propoxide
Authors: M J Percy (Author) - Monash University
John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Division
L Spiccia (Author) - Monash University
B O West (Author) - Monash University
J L Woolfrey (Author) - University of Auckland, New Zealand
Publication details: Journal of Sol-Gel Science and Technology, Vol.19(1-3), pp.315-319
Publisher: Springer New York LLC
Date published: 2000
DOI: 10.1023/A:1008781515324
ISSN: 0928-0707; 0928-0707
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449092702621
Output Type: Journal article

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