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Magnetorheology and sedimentation behavior of an aqueous suspension of surface modified carbonyl iron particles

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5 Author(s)
Cheng, H.B. ; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, People’s Republic of China ; Zuo, L. ; Song, J.H. ; Zhang, Q.J.
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Surface modified carbonyl iron particles (SMCIPs) were synthesized by coating carbonyl iron particles with an organic reagent (N-polyether, N, N, N,-acetyloxy) 2, 6-aminion-1, 3, 4-thiadiazole dimer. The properties of these SMCIPs, including morphology, structure, and magnetic behavior, were characterized using scanning electron microscopy and a vibrating sample magnetometer. Aqueous magnetorheological (MR) fluids were prepared using SMCIPs. MR properties were measured via a strain-controlled parallel disk rheometer equipped with a magnetic field source. Addition of the organic surface coating layer was found to greatly improve sedimentation stability of the aqueous MR fluids at a small cost of a reduction in field dependent yield stress.

Published in:
Journal of Applied Physics  (Volume:107 ,  Issue: 9 )

Date of Publication: May 2010

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