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Synthesis and characterization of monodisperse magnetic composite
particles for magnetorheological fluid materials

Abstract
Monodisperse magnetic composite particles (MCP) were prepared and characterized for a study of magnetic field-responsive fluids.
Magnetic composite particles used are iron oxide-coated polymer composite particles, which were synthesized through in situ coating of
iron oxide onto pre-existing polymer particles by the reduction of ferrous fluids. For a uniform and bulk coating of iron oxide, the porous
structure was introduced into the substrate polymer particles through a two-step seeded polymerization method. Moreover, surface cyano-
functionality was born from acrylonitrile unit of substrate polymer and it played an important role in obtaining successful uniform coating.
The structure of the composite particle was analyzed by using a thermo gravimetric analysis (TGA) and a X-ray diffraction (XRD) analysis.
The magnetization property of the particle was also observed. Then, the rheological properties of monodisperse magnetorheological (MR)
suspensions of magnetic composite particles were examined under a magnetic field using a parallel-plate type commercial rheometer. From
therheologicalmeasurements,itwasfoundthatMRpropertiesofthemagneticcompositesuspensionsaredependentontheironoxidecontent
and the fluid composition.
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