Improvement of the oxidation stability of cobalt nanoparticles
In order to enhance the resistance of cobalt nanoparticles to oxidation in air, the impact of different stabilization strategies on the isothermal oxidation of particle dispersions and powders was kinetically investigated and compared to as-prepared particle preparations. A post-synthesis treatment...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2012-01-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.3.9 |
| _version_ | 1811259103813566464 |
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| author | Celin Dobbrow Annette M. Schmidt |
| author_facet | Celin Dobbrow Annette M. Schmidt |
| author_sort | Celin Dobbrow |
| collection | DOAJ |
| description | In order to enhance the resistance of cobalt nanoparticles to oxidation in air, the impact of different stabilization strategies on the isothermal oxidation of particle dispersions and powders was kinetically investigated and compared to as-prepared particle preparations. A post-synthesis treatment with different alcohols was employed, and we also investigate the influence of two different polymer shells on the oxidation process. We found a parabolic decrease of the magnetization for all particle charges, indicating that the process is dominated by a diffusion of oxygen to the cobalt core and a radial growth of the oxide layer from the particle surface to the core. A significant deceleration of the oxidation process was observed for all alcohol-passivated particle preparations, and this resulted finally in a stagnation effect. The stabilizing effect increases in the sequence Co@OA/MeOH < Co@OA/EtOH < Co@OA/iPrOH. For polymer-coated particle preparations Co@PCL and Co@PS, the deceleration was even more pronounced. The results demonstrate that cobalt nanoparticles can effectively be protected against oxidation in order to improve their mid- to longterm stability. |
| first_indexed | 2024-04-12T18:25:25Z |
| format | Article |
| id | doaj.art-4ebb59c9c6b143848cbecd906c3f7ec7 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-04-12T18:25:25Z |
| publishDate | 2012-01-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-4ebb59c9c6b143848cbecd906c3f7ec72022-12-22T03:21:16ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862012-01-0131758110.3762/bjnano.3.92190-4286-3-9Improvement of the oxidation stability of cobalt nanoparticlesCelin Dobbrow0Annette M. Schmidt1Department für Chemie, Universität zu Köln, Luxemburger Str. 116, D-50939 Köln, GermanyDepartment für Chemie, Universität zu Köln, Luxemburger Str. 116, D-50939 Köln, GermanyIn order to enhance the resistance of cobalt nanoparticles to oxidation in air, the impact of different stabilization strategies on the isothermal oxidation of particle dispersions and powders was kinetically investigated and compared to as-prepared particle preparations. A post-synthesis treatment with different alcohols was employed, and we also investigate the influence of two different polymer shells on the oxidation process. We found a parabolic decrease of the magnetization for all particle charges, indicating that the process is dominated by a diffusion of oxygen to the cobalt core and a radial growth of the oxide layer from the particle surface to the core. A significant deceleration of the oxidation process was observed for all alcohol-passivated particle preparations, and this resulted finally in a stagnation effect. The stabilizing effect increases in the sequence Co@OA/MeOH < Co@OA/EtOH < Co@OA/iPrOH. For polymer-coated particle preparations Co@PCL and Co@PS, the deceleration was even more pronounced. The results demonstrate that cobalt nanoparticles can effectively be protected against oxidation in order to improve their mid- to longterm stability.https://doi.org/10.3762/bjnano.3.9cobalt nanoparticlescore–shell particlesisothermal oxidationnanoscale passivationparabolic rate constant |
| spellingShingle | Celin Dobbrow Annette M. Schmidt Improvement of the oxidation stability of cobalt nanoparticles Beilstein Journal of Nanotechnology cobalt nanoparticles core–shell particles isothermal oxidation nanoscale passivation parabolic rate constant |
| title | Improvement of the oxidation stability of cobalt nanoparticles |
| title_full | Improvement of the oxidation stability of cobalt nanoparticles |
| title_fullStr | Improvement of the oxidation stability of cobalt nanoparticles |
| title_full_unstemmed | Improvement of the oxidation stability of cobalt nanoparticles |
| title_short | Improvement of the oxidation stability of cobalt nanoparticles |
| title_sort | improvement of the oxidation stability of cobalt nanoparticles |
| topic | cobalt nanoparticles core–shell particles isothermal oxidation nanoscale passivation parabolic rate constant |
| url | https://doi.org/10.3762/bjnano.3.9 |
| work_keys_str_mv | AT celindobbrow improvementoftheoxidationstabilityofcobaltnanoparticles AT annettemschmidt improvementoftheoxidationstabilityofcobaltnanoparticles |