Abstract
As a new magneto-responsive smart material, core–shell structured mesoporous Fe3O4@mSiO2 nanoparticles were fabricated by a surfactant-based sol–gel approach using Fe3O4 nanoparticles, and then adopted as magnetorheological (MR) materials. The Fe3O4 particles were initially synthesized by a solvo-thermal process. Scanning electron microscopy and transmission electron microscopy were employed to observe the morphology of the as-synthesized mesoporous silica-coated Fe3O4 particles. Fourier transform infrared spectroscopy and X-ray diffraction results showed that the mesoporous silica shell is successfully coated on the Fe3O4 nanoparticles. BET adsorption measurement also confirmed their mesopore formation. Rheological properties of the silica-coated Fe3O4-based MR fluid dispersed in silicone oil were investigated, and a change in the slope of the yield stress as a function of magnetic field strength from 2.0 to 1.5 was observed, with improved dispersion stability.
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