| Magnetite materials were prepared by co-precipitation method and seeding growth method,three kinds of products were obtained,which were Fe3O4/PEG ( polyethylene glycol ) ferrofluid,the water-base magnetic liquid modified with citric sodium and Fe3O4/ZnO core-shell nanoparticles. These were characterized by series advanced analysis technologies of SEM,TEM,XRD,XPS,FT-IR Analysis. The effects of experiment condition on morphology,Phase component and structure of these products were investigated in detail.The water-base magnetic liquid modified with citric sodium were using citric sodium as the surfactant, The results indicate that the size of colloidal particles are obviously reduce by increasing the surfactant of citric sodium. It shows that when the dosage of the citric sodium is 0.31 times more the Fe3O4.The size of Fe3O4 nanoparticles is about 3nm and displayed a stable colloid in the water and not deposited until several months.Nano-scale ferrofluid of PEG/Fe3O4 were prepared via the technology for synchronously preparing magnetic particles and covering surfactant and using water as the working fluid and PEG as the surfactant, The results indicate that the size of colloidal particles are obviously influenced by PEG content in the reaction system , It shows that the Fe3O4 nanoparticles is about 10nm when the dosage of the PEG is 700g/L,and displayed a stable colloid in the PEG, not deposited until several month .A core-shell structure material, Fe3O4/ZnO,was prepared by a seeding growth method.The Fe3O4 /ZnO core-shell MNPs were obtained by coating the MNPs with direct precipitation using zinc acetate and Diethylene Glycol (DEG), the production was dried at 50°C. VSM analysis showed that as-synthesized core-shell nanoparticles exhibit super paramagnetic property at the room temperature. |
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