Synthesis and Characterization of Magnetorheological Fluids with Super Paramagnetic Nanomaterials in Polymeric Matrix

摘要

Magneto-rheological (MR) fluids represent an exciting family of smart materials that have the unique ability to undergo rapid (within a few μs) changes in their apparent viscosity on the application of an external magnetic field. Here a new type of magneto-rheological is introduced fluid with a mixture of nano sized (～15 nm) Fe_3O_4 particles and micro sized (1-8μm) iron particles dispersed in polymeric matrix. The nanoparticles are synthesized by co-precipitation technique and characterized using Transmission Electron Microscope (TEM) and X-Ray Diffraction (XRD). Rheological properties of MR fluid were studied in the presence of varying magnetic field. It is observed that, varying the strength of magnetic fields has a significant effect on the viscosity of the fluid.