Preparation Of Magnetite Nanoparticles And Its Carbon Composite Particles By The Solvothermal Method

nanostructured magnetite materials are very important functional materials, which always display some individual applications because of their unique physical and chemical properties. The synthesis, characterization and magnetic properties of nanostructured magnetic materials have become a hot topic in magnetism research areas and are attracting a growing interest because of the potential applications such as magnetic recording, ferrofluids, catalysis, biology and medicine. More and more attentions have been paid to the studies of the synthesis and magnetic properties of those magnetic materials with uniform structure and functions.In this paper, a novel anionic surfactant containing carboxylmethylsulfonyl group, which could decarboxylate at lower temperature, and its organic ferrous salt and ferric salt was synthesized with1-bromohexadecane and mercaptoacetic acid as raw materials, based on the thermal decarboxylation property of Carboxymethyl sulfonyl and the structural characteristics of the commonly used surfactants during the preparation of nanomaterials. TG characterization shows that organic ferrous salt and ferric salt can be decomposed at about150℃. The magnetite nanoparticles and its carbon composite nanoparticles could be prepared through the solvothermal method with the organic ferrous salt and ferric salt for iron source and glucose for carbon source. The effect of the different reaction conditions on the properties of nanoparticles was reasearched. The size and form of nanoparticles was observed by Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). The crystal structure was identified using X-ray diffraction (XRD) method. Magnetic properties could be determined by vibrating sample magnetometer (VSM). The results showed that magnetite nanoparticles had the super paramagnetic and uniform size, about5nm. And its saturation magnetization intensity was62.37emu/g. The size of C@Fe3O4nanoparticles prepared through two steps was about100nm and the saturation magnetization intensity45.26emu/g. The Fe3O4@C composite nanoparticles prepared through one step has good dispersancy and thermal stability. Fe3O4@C composite nanoparticles can be stable for a long time.