Abstract
Water-based magnetic fluids (Fe 3 O 4 ) with good dispersion were synthesized by co-precipitation method in this study. The synthesis conditions for the product were studied and results showed that the particle sizes were between 10-20 nm, and the nanoparticles proved to be Nano Fe 3 O 4 . Stability tests for the water-based magnetic fluids showed that the product had better dispersion both in ethanol and water, using the PEG-4000 as the surfactant. The nanoparticles can be placed in the air for a long time, which is good for preparation of core-shell composite materials when needed.
Highlights
Magnetic fluid is a highly stable colloidal solution [1] that is made up of ferromagnetic or ferrimagnetic particles which are highly dispersed in liquid carrier.The particle size for the magnetic particles is not more than 20 nm
The PEG-coated Fe3O4 nanoparticles exhibited the same characteristic diffraction peaks as pure Fe3O4. These results indicated that the PEG-coated Fe3O4 nanoparticles had been successfully synthesized and the crystal structure of the Fe3O4 did not change after being coated with the PEG
Water-based magnetic fluids (Fe3O4) with good dispersion were synthesized by co-precipitation method
Summary
Magnetic fluid is a highly stable colloidal solution [1] that is made up of ferromagnetic or ferrimagnetic particles which are highly dispersed in liquid carrier.The particle size for the magnetic particles is not more than 20 nm. The liquid carrier can be selected by seal medium and working conditions which can be water, kerosene, or silicone oil [2-6].Because of the special physical properties, chemical properties and fluid properties of water-based magnetic fluids, they can be widely used in mechanical, chemical, medical and other fields [7], especially in hyperthermia. In this study PEG-4000 was used as the surfactant in the co-precipitation method when preparing the water-based magnetic fluid with good suspension. The magnetic fluid remained stable after being placed in the air for a long time, providing the basis for its further use in the preparation of core-shell structure composites
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