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Preparation of porous zirconia microspheres via emulsion method combined with phase separation

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Abstract

Porous zirconia (ZrO2) microspheres with incontinuous multicavities were prepared via emulsion method combined with phase separation in the presence of polyvinylpyrrolidone (PVP). The morphology of the microspheres is derived from the spherical oil droplets by high-speed shearing and the sol–gel reaction on the droplets, while the PVP acts as a phase separation inducer to form incontinuous multicavities inside the microspheres. The addition of PVP does not change the particle size distribution and smooth surface morphology of the microspheres, while the size of cavities inside microspheres increases gradually with the increase in PVP amount. The particle characteristics, phase transformation and cavity formation mechanism of porous ZrO2 microspheres are analyzed in detail.

Graphical Abstract

Porous ZrO2 microspheres with incontinuous multicavities were prepared via emulsion method combined with phase separation in the presence of polyvinylpyrrolidone (PVP). The morphology of the microspheres is derived from the spherical oil droplets by high-speed shearing and the sol–gel reaction on the droplets, while the PVP acts as a phase separation inducer to form incontinuous multicavities inside the microspheres.

A schematic illustration of the formation mechanism of ZrO2 microspheres with PVP and without PVP

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Acknowledgments

This work was supported by the High Science & Technique Brainstorm Project of Zhejiang Province of China (Grant No. 2014C01017).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Zhejiang University, Hangzhou, People’s Republic of China

    Xingzhong Guo, Guisong Hao, Yuan Xie, Weiwei Cai & Hui Yang

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  1. Xingzhong Guo
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  2. Guisong Hao
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  3. Yuan Xie
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Correspondence to Xingzhong Guo.

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Guo, X., Hao, G., Xie, Y. et al. Preparation of porous zirconia microspheres via emulsion method combined with phase separation. J Sol-Gel Sci Technol 76, 651–657 (2015). https://doi.org/10.1007/s10971-015-3817-y

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  • DOI: https://doi.org/10.1007/s10971-015-3817-y

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