Sol-gel synthesis of complex titanates in micro-emulsions

C J Barbé; R Graf; K S Finnie; M Blackford; R Trautman; John R Bartlett

doi:10.1023/A:1020706106450

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Sol-gel synthesis of complex titanates in micro-emulsions

Journal article

Peer reviewed

Sol-gel synthesis of complex titanates in micro-emulsions

C J Barbé, R Graf, K S Finnie, M Blackford, R Trautman and John R Bartlett

Journal of Sol-Gel Science and Technology, Vol.26(1-3), pp.457-462

2003

DOI: https://doi.org/10.1023/A:1020706106450

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Abstract

Materials Engineering

reverse micelles

microemulsions

multicomponent titanates

nanoparticles

Amorphous precursor nanopowders of zirconolite (CaZrTi2O7) were prepared using a water-in-oil micro-emulsion synthesis, with Ti(OiC3H7)4, Zr(OnC3H7)4 and either Ca(OC2H5)2 or an aqueous Ca(NO3)2 solution as precursors. The stoichiometry and structural evolution of the nanoparticles were investigated using a range of techniques, including ICP-MS, TEM, gas adsorption and vibrational spectroscopy. The use of Ca(OC2H5)2 led to slightly sub-stoichiometric nanopowders (CaxZrTi2O6+x, x = 0.8), following washing. Lower values of x were obtained in the washed nanopowders when using Ca(NO3)2, with x = 0.004, 0.022 or 0.52 at pH 2, 7 or 13, respectively. In the latter system, a comparison between the washed and unwashed nanopowders revealed that 25% of the calcium was lost during washing. The Ca(NO3)2 was found to form unstable tetraamine complexes within the reverse micelles at high pH, which transformed into Ca(OH)2 on ageing. The Ca(OH)2 can then interact with the hydrolysed titanium/zirconium alkoxides, and thus be integrated chemically into the final nanoparticle structure.

Details

Title: Sol-gel synthesis of complex titanates in micro-emulsions
Authors: C J Barbé (Author) - Australian Nuclear Science and Technology Organisation Materials Division
R Graf (Author) - Australian Nuclear Science and Technology Organisation Materials Division
K S Finnie (Author) - Australian Nuclear Science and Technology Organisation Materials Division
M Blackford (Author) - Australian Nuclear Science and Technology Organisation Materials Division
R Trautman (Author) - Australian Nuclear Science and Technology Organisation Materials Division
John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Division
Publication details: Journal of Sol-Gel Science and Technology, Vol.26(1-3), pp.457-462
Publisher: Springer New York LLC
Date published: 2003
DOI: 10.1023/A:1020706106450
ISSN: 0928-0707
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99448644902621
Output Type: Journal article

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