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中文摘要：
采用气体扩散法,以硝酸铈和碳酸铵为铈源和沉淀剂,利用十六烷基三甲基溴化铵（CTAB）为晶体生长调节剂,得到了物性可控的氧化铈超细粉体。并探索CTAB控制球形氧化铈制备的作用机理。结果表明,CTA＋通过静电匹配作用与OH-、CO_32-结合,Ce3＋定向排列在球形胶束外表面与OH-、CO_32-反应生成形貌可控前驱体晶体,焙烧后得到类球形氧化铈粉体。经BET表面积测试,添加CTAB和未加CTAB制备的氧化铈粉体的比表面积分别是100.6855 m2·g-1、83.2782 m2·g-1。
英文摘要：
In this paper,spherical CeO_2 powder materials were synthesized by the gas diffusion method using Ce（ NO_3）_3 as raw materials,（ NH_4）_2CO_3as the precipitant and cetyltrimethylammonium bromide（ CTAB） as template. The mechanism of CTAB as a template were also discussed. The results show that CTAB could be used as an efficacious crystal growth modifier to induce the self- assembly of precursors,control the crystallization growth of precursor of CeO_2 and control the morphology of CeO_2 particles by thermal decomposition of the precursors via the positively charged CTA＋and OH-,CO_32- functional groups electrostatic matching at room temperature. The obtained products in the presence of 1. 5 g / L CTAB and the absence of CTAB exhibited the BET surface area of 100. 6855 m2/ g and 83. 2782 m2/ g,respectively.
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