| 초록 |
One of the major problems of magnetorheological fluids (MR fluids) is anti-sedimentation property. Because the density of magnetic particle is much larger than the density of the carrier liquid, sedimentation of magnetic particle occurs, and this phenomena can degrade the performance of MR fluids. In this research, to lower the density of magnetic particles, we synthesized hollow PMAA@Fe3O4 microparticles usinbg silica microspheres as hard template. By examining morphology and structure, we concluded that synthesized particles have hollow structures with Fe3O4 at the outside of the PMAA shells. Magnetorheological properties of the MR fluids were measured using rotational rheometer at different magnetic field strengths. The anti-sedimentation property of the MR fluids was observed by measuring the density of bare Fe3O4 and the synthesized particles. |
