Synthesis and characterization of magnetic mesoporous particles

Magnetic mesoporous particles were synthesized and their magnetic and structural properties are reported. The synthesis procedure consists of four steps: (i) preparation of magnetite colloidal nanoparticles; (ii) growth of a silica layer; (iii) development of the mesoporous structure and (iv) template removal. Two different methods for the template removal were studied and their effectiveness was discussed. Magnetization and Mössbauer spectroscopy measurements showed superparamagnetic behavior for the particles at room temperature. X-ray diffraction and nitrogen adsorption measurements showed a mesoporous MCM-41 structure with 2.48 nm pore diameter and 1023 m2/g total area.

Magnetic mesoporous particles consisting of Fe3O4 nanoparticles embedded in a SiO2 matrix obtained by a simple procedure and presenting unprecedented textural properties: 1023 m2 g−1 surface area and 300 nm size.Figure optionsDownload high-quality image (109 K)Download as PowerPoint slide