We report kinetic study on the hydrothermal synthesis of cerium oxide nanoparticles using a flow-type reactor. The synthesis was performed in the presence of organic molecules to modify the surface of the cerium oxide nanoparticles during their synthesis. The amount of reacted cerium ion was evaluated using inductively coupled plasma (ICP) method. Arrhenius plots assuming first-order reaction showed that the presence of organic molecules slowed the consumption of cerium ion, which was plausibly caused by the capping of the growing surface of the metal oxide nanoparticles; the size of synthesized nanoparticles in the presence of the surface modifiers was much smaller than that of the products without surface modifiers. Based on these kinetic studies, we can optimize the configuration of flow-type reactors and synthetic conditions for desired products. For example, we have successfully synthesized cerium oxide nanoparticles whose diameter was about 4 nm using the flow-type reactor. Their surface was capped by organic molecules that increased the affinity with dispersion media and prevented agglomeration between them.

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1. One-Step Hydrothermal Synthesis of Cubic Nano-Assemblies Comprising Surface-Modified Octahedral Cerium Oxide Nanoparticles.