Effect of particle aggregation on the magnetic and magnetorheological properties of magnetic suspensions
Magnetization as a function of the magnetic field strength for the indicated iron suspensions. Solid lines correspond to the experimental data. Dashed lines correspond to the Fröhlich-Kennelly fitting [Eq. (1)].
Shear stress as a function of shear rate for a suspension containing 8.8% iron volume fraction dispersed in kerosene. The values of the magnetic field strength inside the sample are indicated.
Similar to Fig. 2, but for a suspension containing 10.5% of iron and aluminum stearate.
Shear stress as a function of shear rate for a suspension containing 8.6% iron volume fraction and of silica nanoparticles. The values of the internal magnetic field strength are indicated.
Scaled yield stress (; : shear stress at and ) as a function of the magnetic field strength generated inside the different suspensions studied.
Dynamic yield stress scaled by the iron volume fraction, , as a function of the magnetic field strength inside the samples. Inset: data for low magnetic field.
Similar to Fig. 6, but in log-log representation.
Experimental variation of the parameter of Eq. (4) with at high magnetic fields for the indicated iron suspensions.
Values of initial magnetic susceptibility and saturation magnetization obtained by fitting the experimental data in Fig. 1 to the Fröhlich–Kennelly (FK) law [Eq. (1)]. values (mean standard deviation) obtained by averaging the experimental magnetization data in Fig. 1 for , and real iron volume fractions obtained by applying Eq. (2), are also included.
Parameter obtained by fitting the data in Fig. 6 to the power law given by Eq. (4) in the whole range of applied magnetic fields (up to ), and also for (or ).
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