Facile preparation of carbon coated magnetic Fe3O4 particles by a combined reduction/CVD process |
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Authors: | Juliana C Tristão José D Ardisson Rochel M Lago |
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Affiliation: | a Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte-MG, 31270-901, Brazil b Laboratório de Física Aplicada, CDTN, Belo Horizonte, MG 30123-970, Brazil c Departamento de Química, Universidade Federal de Ouro Preto, Ouro Preto-MG, 35400-000, Brazil |
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Abstract: | In this work, we report a simple method for the preparation of magnetic carbon coated Fe3O4 particles by a single step combined reduction of Fe2O3 together with a Chemical Vapor Deposition process using methane. The temperature programmed reaction monitored by Mössbauer, X-ray Diffraction and Raman analyses showed that Fe2O3 is directly reduced by methane at temperatures between 600 and 900 °C to produce mainly Fe3O4 particles coated with up to 4 wt% of amorphous carbon. These magnetic materials can be separated into two fractions by simple dispersion in water, i.e., a settled material composed of large magnetic particles and a suspended material composed of nanoparticles with an average size of 100-200 nm as revealed by Scanning Electron Microscopy and High-resolution Transmission Electron Microscopy. Different uses for these materials, e.g., adsorbents, catalyst supports, rapid coagulation systems, are proposed. |
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Keywords: | A magnetic materials B vapor deposition D surface properties |
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