Hydrothermal synthesis of cerium oxide nanoparticles stabilized with citric acid
Sergey V. Pigarev, 1 , Daria V. Tsyupka, 1, Ekaterina A. Mordovina, 1, Irina Yu. Goryacheva, 1, Olga A. Goryacheva, 1, Nelli R Popova, 2, 1 Saratov State University, SSU, Saratov, Russia, 2 Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow region, Russia
Abstract
Cerium oxide nanoparticles (NP CeO2) are a promising material, due to their unique physical and chemical properties and photocatalytic activity. NPs CeO2 have low toxicity and high stability, they can easily enter into redox reactions. Cerium ions in NPs CeO2 can exist in one of two oxidation states (Ce3+ and Ce4+) on the NP surface, and highly mobile oxygen vacancies in the lattice allow cerium ions to freely and reversibly alternate oxidation states.
In order to maintain a stable nanoparticle size, it is necessary to confine the surface with stabilizing molecules. This will also help to maintain colloidal stability over a long period of time. Various organic acids are used as a stabilizer for CeO2 NPs. The negative charges on the carboxyl groups act as repulsive agents between the cerium oxide nanoparticles, creating a stable colloidal sol
. Thus, it is important to develop a reliable synthesis method for the production of stable ultra-small CeO2 NPs. This is necessary to achieve positive and meaningful results in biomedical applications. In this work, we report the production of CeO2 NPs stabilized with citric acid by the hydrothermal method. The hydrothermal method was used as amost promising for obtaining ultra-small NPs CeO2 with a narrow size distribution (2–10 nm). The effect of citric acid concentration on the size and stability of the obtained CeO2 NPs is shown.
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Pigarev V. Sergey
Saratov State University
Russia
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