Studying on Preparation of Polygonal Fe₃O₄ and Silica Coating

Their small size, surface effects and tunneling allow the use of nanomaterials in applications such as catalysis, sensors and a lot of other fields. Fe₃O₄ is one of the main oxides used in nanotechnology due to its excellent photoelectromagnetic properties. In this paper, the polygonal Fe₃O₄ nanoparticles were prepared through high temperature synthesis method. Then, silica coating via Stöber method was applied to obtain a nanomaterial having uniform particles. The prepared Fe₃O₄ had good crystal form and ultra-high saturation magnetization, up to 134.2 emg/g. Fe₃O₄ prepared by dodecyl trimethyl ammonium bromide (DTAB) template method allows easy silica coating: the obtained Fe₃O₄@SiO₂ particles showed a good core-shell structure and corrosion resistance making them very promising in biological applications.