Synthesis of nanocrystalline CeO₂ particles by different emulsion methods

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• 作者：Sunisa Supakanapitak ; Virote Boonamnuayvitaya ; Somnuk Jarudilokkul ; ^{somnuk.jar@kmutt.ac.th}
• 关键词：CeO2 ; Reversed micelle ; Emulsions liquid membrane ; Colloidal emulsion aphrons
• 刊名：Materials Characterization
• 出版年：2012
• 期刊代码：57_10445803
• 类别：ms
• 出版时间：May, 2012
• 卷：67
• 期：Complete
• 页码：83-92
• 文件大小：1676 K

摘要

Cerium oxide nanoparticles were synthesized using three different methods of emulsion: (1) reversed micelle (RM); (2) emulsion liquid membrane (ELM); and (3) colloidal emulsion aphrons (CEAs). Ammonium cerium nitrate and polyoxyethylene-4-lauryl ether (PE4LE) were used as cerium and surfactant sources in this study. The powder was calcined at 500 掳C to obtain CeO₂. The effect of the preparation procedure on the particle size, surface area, and the morphology of the prepared powders were investigated. The obtained powders are highly crystalline, and nearly spherical in shape. The average particle size and the specific surface area of the powders from the three methods were in the range of 4-10 nm and 5.32-145.73 m²/g, respectively. The CeO₂ powders synthesized by the CEAs are the smallest average particle size, and the highest surface area. Finally, the CeO₂ prepared by the CEAs using different cerium sources and surfactant types were studied. It was found that the surface tensions of cerium solution and the type of surfactant affect the particle size of CeO₂.