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- Title
Synthesis of rGO/CoFe 2 O 4 Composite and Its Magnetorheological Characteristics.
- Authors
Lv, Yang; Gong, Chengjie; Dong, Yuzhen; Choi, Hyoung Jin
- Abstract
In this study, composite particles of rGO/CoFe2O4 were synthesized using a solvothermal method to fabricate a low-density magnetorheological (MR) material with enhanced sedimentation stability. The morphology and crystallographic features of rGO/CoFe2O4 were characterized via SEM, TEM, and XRD, and its magnetic properties were tested using VSM. The MR fluid was formulated by blending rGO/CoFe2O4 particles into silicone oil. Under different magnet strengths (H), a rotational rheometer was used to test its MR properties. Typical MR properties were observed, including shear stress, viscosity, storage/loss modulus, and dynamic yield stress ( τ d y ) following the Herschel–Bulkley model reaching 200 Pa when H is 342 kA/m. Furthermore, the yield stress of the MR fluid follows a power law relation as H increases and the index changes from 2.0 (in the low H region) to 1.5 (in the high H region). Finally, its MR efficiency was calculated to be about 104% at H of 342 kA/m.
- Subjects
MAGNETORHEOLOGY; MAGNETORHEOLOGICAL fluids; YIELD stress; HERSCHEL-Bulkley model; SHEARING force
- Publication
Materials (1996-1944), 2024, Vol 17, Issue 8, p1859
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma17081859