Temperature and field dependences of magnetic fluid's shear viscosity: Decoupling inputs from a carrier fluid and magnetic nanoparticles

Rheology of Aqueous Ferrofluids: Transition from a Gel-Like Character to a Liquid Character in High Magnetic Fields

“…Figure 2 shows the viscosity (η) curves of the ferrofluid measured at different magnetic fields (B). The ferrofluid exhibits a shear-thinning behaviour at all magnetic fields, as the viscosity of the ferrofluid decreases with the increasing shear rate [27,33]. As the γ increases, the difference in the viscosity between the different magnetic fields becomes smaller.…”

“…Normally, these nanoparticles are used in the form of ferrofluids, which are colloidal suspensions of superparamagnetic nanoparticles (Co, Fe, Fe 3 O 4 , γ-Fe 2 O 3 , CoFe 2 O 4 ) dispersed in a carrier liquid (water, engine oil, transformer oil, etc.) that remains stable in the presence of a magnetic field [5][6][7][8][9][10][11][23][24][25][26][27].…”

Magnetic Fluids: The Interaction between the Microstructure, Macroscopic Properties, and Dynamics under Different Combinations of External Influences

“…As magnetic fluid is fluid, studying its oscillatory movements requires the use of a system of pipes either fully or partially filled with magnetic fluid. For example, researchers place U-shaped tubes in an external magnetic field [ 153 , 154 , 155 , 156 , 157 , 158 ]. In [ 153 ], both experimental and theoretical studies of the elasticity coefficient of the system were conducted.…”

“…The values from the experiment and theoretical evaluation differed by an order of magnitude, with experimental difficulties and a demagnetizing factor indicated as the reasons for this. In [ 158 ], researchers investigated the effect of mechanical vibrations on a cylindrical tube filled with magnetic fluid. They wound measuring coils on the tube, and the system was positioned in an external magnetic field.…”

“…A promising direction for studying the microrheology of magneto-liquid systems involves investigating fluctuations in the volume of a magnetic fluid with a simple cylindrical configuration levitating in an external magnetic field. This approach allows us to assess the magnetic and rheological properties of a magnetic fluid, as well as the microstructure in the thin wall layer of a magneto-liquid system [ 158 , 159 , 160 , 161 , 162 ].…”