Magnetorheological Fluids
2.1 Magnetorheological fluids and Their Properties The focus of scientific research on magnetic nanoparticles has increased significantly the last decade, beacause for their various applications from industrial to biomedical field (magnetic resonance imaging (MRI), hyperthermia, drug delivery, and many more. The major property of these magnetic particles is their magnetization which makes it appropriate in using it multi-dimensionally. Magnetorheological fluids are a smart material fluid that becomes strongly viscous and magnetized under the application of magnetic field. A colloidal suspension of super-paramagnetic particles, ferromagnetic or paramagnetic is dispersed in a career fluid. These suspended particles are magnetic in behavior which …show more content…
The phenomenon is also known as the Magnetorheological effect. The yield stress of the fluid when in its active ("on") state can be controlled very accurately by varying the magnetic field intensity. Upshot of this is the fluid's ability to transmit force can be controlled with an electromagnet which gives rise to many possible control based applications. MRFs also possess outstanding rheological characteristics, for example high yield stress and shear viscosity, that can be altered by tuning an external magnetic field. …show more content…
If these magnetic micron-sized particles are heated above their Curie temperature then they will change from being ferromagnetic to paramagnetic. This behavior depends on the magnetic field strength and the transition occurs due to the movement of Bloch walls. As the temperature rises it provides sufficient energy to Bloch walls which can be easily rotated and demagnetization occurs when the externally applied magnetic field is removed. The Curie temperature in ferromagnetic materials is below the melting point. The magnetization and the Curie temperature of all ferromagnetic materials are based on the composition of the materials. The Curie temperature of the fluid can be tailored for each individual need as the chemical composition can be changed and when the particles are added in MRF suspension due to the single domained nature of the solid and the interaction of the particles and the carrier
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