Abstract
In this work, a superparamagnetic fluid based on Fe3O4 hollow nanospheres was developed and the influence of the particle structure on the rheological properties was investigated. The Fe3O4 hollow nanospheres which were prepared by using the hydrothermal method presented the superparamagnetic characteristic, and the magnetic fluid thereof showed well magnetorheological (MR) effect. The stable magnetic fluid had a high yield stress even at low shear rate and its maximal yield stress was dramatically influenced by the measurement gap. In comparison to the Fe3O4 nanoparticles based magnetic fluid (MF), the Fe3O4 hollow nanospheres based MF exhibited better MR effect and higher stability since the unique hollow nanostructure. The shear stress of the hollow nanospheres is about 1.85 times larger than the nanoparticles based MF because it formed stronger chains structure under applying a magnetic field. To further investigate the enhancing mechanism, a molecule dynamic simulation was conducted to analyze the shear stress and the structure evolution of the Fe3O4 hollow nanospheres based MF and the simulation matched well with the experimental results.
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