| 초록 |
One of the major problems of magnetorheological fluids (MR fluids) is sedimentation stability. Because the density mismatch between light carrier medium and heavy magnetic particles, the particles settle down quickly to bottom, which limits the utility of MR fluids In this research, to enhance the sedimentation satilibty of MR fluids by lowering the density of magnetic particles, we synthesized hollow-structured polydivinylbenzene@Fe3O4 (h-PDVB@Fe3O4) microparticles using 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 shells. Magnetorheological properties of the MR fluids were measured using rotational rheometer at different magnetic field strengths. The sedimentation stability of the MR fluids was observed by measuring the density of the synthesized particles and using turbiscan method. |
