Tristão, Juliana CristinaOliveira, Aline A. S.Ardisson, José DomingosDias, AndersonLago, Rochel Montero2015-04-012015-04-012011TRISTÃO, J. C. et al. Facile preparation of carbon coated magnetic Fe3O4 particles by a combined reduction/CVD process. Materials Research Bulletin, v. 46, p. 748-754, 2011. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0025540811000109>. Acesso em: 02 fev. 2015.0025-5408http://www.repositorio.ufop.br/handle/123456789/4890In 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 reactionmonitored by Mo¨ ssbauer, X-ray Diffraction and Raman analyses showed that Fe2O3 is directly reduced by methane at temperatures between 600 and 900 8C to produce mainly Fe3O4 particles coated with up to 4 wt% of amorphous carbon. Thesemagneticmaterials 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.en-USMagnetic materialsVapor depositionSurface propertiesArtigo publicado em periodicoO periódico Materials Research Bulletin concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3577180915444.https://doi.org/10.1016/j.materresbull.2011.01.008