Counter-ion adsorption and homogeneity of TiO2/ZrO2 nanoparticles from SANS contrast variation

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

doi:10.1007/BFb0110963

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Counter-ion adsorption and homogeneity of TiO2/ZrO2 nanoparticles from SANS contrast variation

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Counter-ion adsorption and homogeneity of TiO2/ZrO2 nanoparticles from SANS contrast variation

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

Trends in Colloid and Interface Science XI, Volume 105, pp.60-65

Steinkopff

1997

DOI: https://doi.org/10.1007/BFb0110963

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Abstract

Macromolecular and Materials Chemistry

Physical Chemistry (incl. Structural)

mixed oxide colloids

nanoparticles

SANS

titania

zirconia

The local structure of titania/zirconia colloids has been investigated using small-angle neutron scattering (SANS). The colloids were produced by: • hydrolysing a mixture of titanium and zirconium alkoxides, and peptising the resulting hydrolysate with nitric acid (homogeneous); • hydrolysing a titanium alkoxide, and peptising the resulting hydrolysate with aqueous zirconium (IV) nitrate solution (heterogeneous). The final titania/zirconia and metal oxide/nitrate mole ratios were 16.0 and 10.0, respectively. 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, which differed significantly from the expected value. These differences 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 infer 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: Counter-ion adsorption and homogeneity of TiO2/ZrO2 nanoparticles from SANS contrast variation
Authors: John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Division
D Gazeau (Author)
Th Zemb (Author)
J L Woolfrey (Author) - Australian Nuclear Science and Technology Organisation Materials Division
Contributors: J B Rosenholm (Editor)
B Lindman (Editor)
P Stenius (Editor)
Publication details: Trends in Colloid and Interface Science XI, Volume 105, pp.60-65
Publisher: Steinkopff
Date published: 1997
DOI: 10.1007/BFb0110963
ISBN: 9783798510869
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99448735002621
Output Type: Book chapter

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