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Science and Technology in Controlling Nanoparticle Size and Shape Xiangdong Feng Ferro Corporation 7500 E. Pleasant VallEy Independence, OH 44131 USA
This study is to elucidate the science and technology for controlling nanoparticle ceria in size and shape. Nanoparticles of CeO2 are synthesized through a hydrothermal process. They are characterized using XRD, TEM, SEM, XPS, NMR, and size analyzer. Systematic study showed that the primary and secondary particle sizes of these particles can be controlled independently. Precise control is achieved through manipulating the concentrations of starting cerium ions and dopant ions, the amount of base used, the reaction temperature, and the reaction duration. The particle shape can be controlled by controlling different synthesis environment using different types of bases such as urea, ammonia, and potassium hydroxide. This environmental control preferentially promotes the low energy surface growth and formation of high energy facets of nanocrystalline CeO2 to achieve shape control. The science in the precise size and shape control of the nano CeO2 particles is achieved through understanding the particle formation mechanism. The technology of precise size and shape control is realized through properly manipulating the experimental conditions to direct nanoparticle grow in the way our industry desires them to.
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Presented at the International Congress
of Nanotechnology, November 7-10, 2004 San Francisco, USA
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