Structural and physical-chemical characterization of redox active CeO2 nanoparticles synthesized by precipitation in water-alcohol solutions
| Autor: | Yuliia Shlapa, Katarina Siposova, Sergii Solopan, Andrey Musatov, Anatolii Belous, Martina Kubovcikova, Katerina Veltruska, Illia Timashkov, Ivana Garcarova |
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| Rok vydání: | 2021 |
| Předmět: |
Aqueous solution
Materials science Precipitation (chemistry) Mechanical Engineering Inorganic chemistry Nanoparticle chemistry.chemical_element Bioengineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Decomposition 0104 chemical sciences chemistry.chemical_compound Chemical state Cerium chemistry Mechanics of Materials Zeta potential General Materials Science Electrical and Electronic Engineering 0210 nano-technology Hydrogen peroxide |
| Zdroj: | Nanotechnology. 32:315706 |
| ISSN: | 1361-6528 0957-4484 |
| Popis: | A set of cerium dioxide nanoparticles (CeO2 NPs) was synthesized by precipitation in water-alcohol solutions under conditions when the physical-chemical parameters of synthesized NPs were controlled by changing the ratio of the reaction components. The size of CeO2 NPs is controlled largely by the dielectric constant of the reaction solution. An increase of the percentage of Ce3+ ions at the surface was observed with a concomitant reduction of the NP sizes. All synthesized CeO2 NPs possess relatively high positive values of zeta-potential (ζ > 40 mV) suggesting good stability in aqueous suspensions. Analysis of the valence- and size-dependent rate of hydrogen peroxide decomposition revealed that catalase/peroxidase-like activity of CeO2 NPs is higher at a low percentage of Ce3+ at the NP surface. In contrast, smaller CeO2 NPs with a higher percentage of Ce3+ at the NP surface display a higher oxidase-like activity. |
| Databáze: | OpenAIRE |
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