| Abstract
| - A novel structure of γ-Fe2O3 nanoparticles (nanorods) embedded in the framework of mesoporous carbon has been developed by a facial co-casting process. These nanoscale γ-Fe2O3 particles/rods exhibit superparamagnetic property, with the saturation magnetization strength of 11.7 emu/g at the highest loading amount.
- A new co-casting method has been developed to synthesize novel mesostructured γ-Fe2O3/C compositeswith γ-Fe2O3 nanoparticles embedded in the wall of ordered mesoporous carbon materials. Fe3+ ionswere captured by the framework of polyfurfuryl alcohol in the channel of mesoporous silica; during thecarbonization process, FeCl3·6H2O was decomposed and magnetic γ-Fe2O3 nanoparticles were formedand confined in the carbon framework. The γ-Fe2O3/C composite materials were characterized usingX-ray diffraction (XRD), nitrogen sorption, Mössbauer spectroscopy, X-ray photoelectron spectroscopy(XPS), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDX) spectroscopytechniques; the magnetization strength was measured on a vibrating-sample magnetometer (VSM). Differentamounts of magnetic iron oxides could be introduced into the composites, which led to varied specificsaturation magnetizations. Near-zero coercivity and remanance indicate the superparamagnetic behaviorof the composites.
|
