Journal
CHEMISTRY OF MATERIALS
Volume 19, Issue 14, Pages 3484-3490Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm0709065
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A new co-casting method has been developed to synthesize novel mesostructured gamma-Fe2O3/C composites with gamma-Fe2O3 nanoparticles embedded in the wall of ordered mesoporous carbon materials. Fe3+ ions were captured by the framework of polyfurfuryl alcohol in the channel of mesoporous silica; during the carbonization process, FeCl3 center dot 6H(2)O was decomposed and magnetic gamma-Fe2O3 nanoparticles were formed and confined in the carbon framework. The gamma-Fe2O3/C composite materials were characterized using X-ray diffraction (XRD), nitrogen sorption, Mossbauer spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and energy-dispersive X-ray (EDX) spectroscopy techniques; the magnetization strength was measured on a vibrating-sample magnetometer (VSM). Different amounts of magnetic iron oxides could be introduced into the composites, which led to varied specific saturation magnetizations. Near-zero coercivity and remanance indicate the superparamagnetic behavior of the composites.
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