Abstract
In this work, the synthesis of hydrous zirconia by controlled double-jet precipitation (CDJP) was carried out in the pH range from 3 to 8. The evolution of particle shape and size during precipitation was investigated. It was found that at pH 3, 7, and 8 during the precipitation process there is no significant change in particle size, the suspension was gel-like, particles actively aggregated during drying. A gradual increase in particle size and a decrease in particle size dispersion specific for layer-by-layer aggregation was observed during CDJP at pH 4 to 6. The resulting particles do not aggregate and retain a rounded globular shape with a narrow size distribution during drying. Samples obtained at a pH above 6 are characterized after drying by a high specific surface area and porosity, as well as a reduced content of NO3- ions. The effect of pH precipitation on the phase composition and crystallite size of calcined samples was discussed.
Published Version
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