Abstract
The hydrolysis and condensation of zirconium n-propoxide in n-propanol have been chemically controlled via the complexation of the zirconium precursor with acetylacetone. The size of the zirconium oxide-based particles is mainly controlled by the complexation ratio x=[acac]/[Zr]. the mean size increases from nanometric to submicronic range when x decreases from 1 to 0.1. Amorphous colloidal particles are obtained at room temperature. They result from a competitive growth/termination mechanism of zirconium-oxo species in the presence of acac surface capping agents. However non-aggregated nanocrystalline particles of tetragonal zirconia, about 2 nm in diameter are formed upon aging at 60°C when hydrolysis is performed in the presence of paratoluene sulfonic acid (PTSA).
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Chatry, M., Henry, M., In, M. et al. The role of complexing ligands in the formation of non-aggregated nanoparticles of zirconia. J Sol-Gel Sci Technol 1, 233–240 (1994). https://doi.org/10.1007/BF00486166
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DOI: https://doi.org/10.1007/BF00486166