Book chapter
Counter-ion adsorption and homogeneity of TiO2/ZrO2 nanoparticles from SANS contrast variation
Trends in Colloid and Interface Science XI, Volume 105, pp.60-65
Steinkopff
1997
Abstract
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 DivisionD 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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