Magneto-viscosity of platelet shaped Ba-Sr ferrite nanoparticles based ferrofluid in different colloids

Abstract

In this work, we present the magnetic response of the flow properties of water based and paraffin oil based Ba-Sr ferrite ferrofluids. The platelet particles act as tiny magnetic discs in the ferrofluids and these ferrofluids are promising fluids for obtaining the better flow control in the presence of magnetic field. The nanoparticles of composition of Ba0.8Sr0.2Fe12O19(BSM) were synthesized by hydrothermal synthesis. The single phase magnetoplumbite structure is observed from the X-ray diffraction pattern of the platelet particles. The hexagonal disc of 5 to 7 nm thickness and 50 to 250 nm in size are seen in the field emission electron microscope and transmission electron microscope micrographs. The magnetization plots show ferromagnetic behavior of the nanoparticles. The magneto-viscosity show high variation in the low field range due to the chain formation of the suspensions in the ferrofluid. The flow curves exhibit power law variation with shear rate at applied magnetic fields.In this work, we present the magnetic response of the flow properties of water based and paraffin oil based Ba-Sr ferrite ferrofluids. The platelet particles act as tiny magnetic discs in the ferrofluids and these ferrofluids are promising fluids for obtaining the better flow control in the presence of magnetic field. The nanoparticles of composition of Ba0.8Sr0.2Fe12O19(BSM) were synthesized by hydrothermal synthesis. The single phase magnetoplumbite structure is observed from the X-ray diffraction pattern of the platelet particles. The hexagonal disc of 5 to 7 nm thickness and 50 to 250 nm in size are seen in the field emission electron microscope and transmission electron microscope micrographs. The magnetization plots show ferromagnetic behavior of the nanoparticles. The magneto-viscosity show high variation in the low field range due to the chain formation of the suspensions in the ferrofluid. The flow curves exhibit power law variation with shear rate at applied magnetic fields.