| 초록 |
One of the major problems of magnetorheological fluids (MR fluids) is lonng- term stability aganinst sedimentation of mangetic particles. 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, we fabricated hierarichically structured Fe3O4 particles through simple electrospray process of citric acid-capped Fe3O4 solution. with pores inside, those structured particles have lower density compared to citric acid-capped Fe3O4, leading to better long-term stability of MR suspensions. Besides, the exclusion of non-magnetic polymer materials from the stuctures make the MR suspensions to have much better MR performance than previous polymer-mangetic composites-based MR fluids. |
