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Synthesis of nanosized zirconia particles via urea hydrolysis

1992; Elsevier BV; Volume: 72; Issue: 2 Linguagem: Inglês

10.1016/0032-5910(92)88015-a

1873-328X

Yuexiang Huang, Guo Cun-ji,

Covalent Organic Framework Applications

A new route, which is called the ZrOCl2·8H2OCO(NH2)2 hydrolysis method, has been described for the preparation of non-agglomerated, nanoscaled ZrO2 particles in a closed system under boiling conditions. The results show that the final hydrolysis products which were prepared from different initial concentrations of ZrOCl2 solutions after boiling for 50 h are monoclinic zirconia and the ZrO2 particle size thus obtained is in the range of 15–100 nm. The electron diffraction patterns reveal that the final ZrO2 particle is built up of a lot of small crystal nuclei oriented between each other. The synthesized ZrO2 particle size mostly depends on both the initial concentration of ZrOCl2 solutions and boiling time and thus can be controlled by selecting suitable primary concentration and boiling time. In addition, the forming mechanism of hydrolysis product has also been discussed.