Improvement of the oxidation stability of cobalt nanoparticles

• Celin Dobbrow and
• Annette M. Schmidt

Beilstein J. Nanotechnol. 2012, 3, 75–81, doi:10.3762/bjnano.3.9

• nanoparticles can effectively be protected against oxidation in order to improve their mid- to longterm stability. Keywords: cobalt nanoparticles; core–shell particles; isothermal oxidation; nanoscale passivation; parabolic rate constant; Findings Magnetic nanoparticles are currently given great attention due

• size and properties of the stabilizer molecule on the observed deceleration, and finally stagnation, of the isothermal oxidation process in air. The particles in this study were synthesized by thermolysis of dicobalt octacarbonyl (Co2(CO)8) in the presence of a fatty acid (oleic acid or ricinolic acid

• susceptibility χini is in all cases lower than the average diameter dc as determined from TEM. In order to investigate the isothermal oxidation process, all particle species were redispersed in toluene to a concentration of 0.5 wt %, and stored in air at 25 °C. Samples were taken at different points in time up