Abstract
A silicone oil based magnetorheological fluid (MRF) containing carbonyl iron-wrapped multi-walled carbon nanotubes (CI-MWCNTs) and fumed silica were fabricated for antisedimentation. CI-MWCNTs as magnetic materials were synthesized by a mild ultrasonication method through 4-Aminobenzoic acid (PABA) as a grafting agent and fumed silica as a filler. Additionally, the density of the carbonyl irons (CIs) was reduced by carboxyl group functionalized multi-walled carbon nanotubes (MWCNTs) and the density of the silicone oil was improved by fumed silica to balance the density between the magnetic materials and carrier fluid. Furthermore, the superparamagnetic materials of CI-MWCNTs maintained a saturation magnetization of 206 emu/g at a magnetic field of 10000 Oe, which was investigated via a vibrating sample magnetometer (VSM). Finally, the CI-MWCNT-based MRF was better than the CI-based MRF based on the magnetorheological effect and antisedimentation.
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