Continuous precipitation of ceria nanoparticles from a continuous flow micromixer
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Cerium oxide nanoparticles were continuously precipitated from a solution of cerium(III) nitrate and ammonium hydroxide using a static microchannel T-mixer. T-mixer synthesis results were compared with synthesis results from batch precipitation. Findings show that the method of mixing is important in the ceria precipitation process. Uniform porous film structures and nanorods were produced when the particle chemistry was synthesized using T-mixing followed by spin coating. Batch mixing, when using higher NH4OH feed concentrations followed by spin coating, was characterized by the heavy agglomeration of nanoparticles. Similar, high aspect ratio nanorods were produced when feed conditions in both batch mixing and T-mixing were identical demonstrating that the momentum effects of continuous microchannel T-mixing did not impact the synthesis process. In addition, it was found that the micromixing approach reduced the exposure of the Ce(OH)3 precipitates to oxygen, yielding hydroxide precipitates in place of CeO2 precipitates. The key advantage of the micro-scale T-mixing approach is higher throughput which is important for the scaling of ceria nanoparticle production.
KeywordsContinuous flow synthesis Ceria Nanoparticles Microreactor Micromixer
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- 4.Tsunekawa S, Sahara R, Kawazoe Y, Kasuya A (2000) Origin of the blue shift in ultraviolet absorption spectra of nanocrystalline CeO2−x particles. Mater Trans JIM 41:1104–1107Google Scholar
- 11.Makishima A, Kubo H, Wada K, Kitami Y, Shimohira T (1986) Yellow coatings produced on glasses and aluminum by the sol–gel process. J Am Ceram Soc 69:C–127–C–129Google Scholar
- 14.Dong X, Hong G, Yu D, Yu D (1997) Synthesis and properties of cerium oxide nanometer powders by pyrolysis of amorphous citrate. J Mater Sci Technol 13:113–116Google Scholar
- 23.Chang CH, Liu SH, Tennico Y, Rundel JT, Remcho VT, Blackwell E, Tseng CH and Paul BK (2005) Progress towards chip-based high-throughput dendrimer synthesis. In: International Conference on Microreaction Technology. Atlanta, Georgia, pp. 3011–3018Google Scholar
- 29.Ehrfeld W, Hessel V, Löwe H (2000) Microreactors: new technology for modern chemistry. Wiley, WeinhemGoogle Scholar
- 30.Tseng C, Paul B (2007) Comparison of batch mixing and micromixing approaches in the synthesis and deposition of ceria nanoparticles. Trans NAMRI 35Google Scholar