Abstract
<p>Nanoparticles of magnetite (Fe<sub>3</sub>O<sub>4</sub>) have been successfully synthesized by coprecipitation method by mixing FeSO<sub>4</sub>.7H<sub>2</sub>O and FeCl<sub>3.</sub>6H<sub>2</sub>O with the addition of 10% NH<sub>4</sub>OH as kopresipitan. Then, functionalized Fe<sub>3</sub>O<sub>4</sub> concentration variation silica (SiO<sub>2</sub>) 5%, 10%, 15%, 20%, 30% and 50%. Particle size and magnetic properties of Fe3O4 nanoparticles were tested by X-Ray Diffraction (XRD) and Vibrating Sample Magnetometer (VSM). XRD results showed the addition of silica is not found new phases when added SiO<sub>2</sub>that serves as a template. The particle size of Fe<sub>3</sub>O<sub>4</sub> nanoparticles obtained 14.23 nm, while the Fe<sub>3</sub>O<sub>4</sub>nanoparticles with the addition of a concentration of 5% and 20% respectively SiO<sub>2</sub>15.45 nm and 16.37 nm. VSM results show the value of saturation magnetization and remanent magnetization decreased as more silica concentration, and increased coercivity field. Test Results of Fourier Transform Infra Red (FTIR) obtained new peaks which indicate that the functionalization process Fe<sub>3</sub>O<sub>4</sub> with silica has been successfully carried out.</p>
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