Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5351463 | Applied Surface Science | 2017 | 14 Pages |
Abstract
Pristine nanoparticles of magnetite were coated by solid silica shell forming core/shell structure. 20Â nm thick silica coating significantly enhanced the chemical and thermal stability of the iron oxide. Chemical and thermal stability of this structure has been compared to the magnetite coated by mesoporous shell and pristine magnetite nanoparticles. It is assumed that six-membered silica rings in a solid silica shell limit the rate of oxygen diffusion during thermal treatment in air and prevent the access of HCl molecules to the core during chemical etching. Therefore, the core/shell structure with a solid shell requires a longer time to induce the oxidation of iron oxide to a higher oxidation state and, basically, even strong concentrated acid such as HCl is not able to dissolve it totally in one month. This leads to the desired performance of the material in potential applications such as catalysis and environmental protection.
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Authors
Krzysztof Cendrowski, Pawel Sikora, Beata Zielinska, Elzbieta Horszczaruk, Ewa Mijowska,