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Table 2
Testing methods for sedimentation stability.
| Testing methods | Basic principle | Specificities |
| Visual Observation | Sedimentation Rate |
Fast and easy to operate, but the measurement accuracy is greatly affected by human judgment |
| Multiple Light Scattering Method | Parameters such as the migration rate of particles and the thickness of the sedimentation layer are calculated to obtain an index of the sedimentation rate | High precision, real-time monitoring and early prediction of material settlement behavior can be achieved |
| Capacitance Method | Particle settling induces changes in the dielectric properties of the system | Susceptible to interference from non-magnetic particles |
| Inductance Methods | Relationship between inductance and magnetic particle concentration characteristics | Distinguish between sedimentation zones, less susceptible to interference from non-magnetic particles |
| Sedimentation Potentiometric Methods | Comparison of the settling properties of solid-phase particles in magnetorheological materials using the potential change generated during their settling | Automatic measurement of material settlement is possible, but only the overall settlement rate between the upper and lower electrode plates can be measured, while the local settlement rate cannot be measured |
| Thermal Conductivity Method | Measurement of thermal conductivity at a fixed location to monitor particle concentration in a sample | Measurement is simple and flexible, but global settlement information is not captured during measurement |
| Magnetic Permeability Method | Measurement of the change in permeability of the deposited and undeposited portions to detect the concentration of magnetic particles | Enables non-contact measurements, but introduces strong magnetic fields that can interfere with true settling |
| Optical Detection Methods | Settling stability of magnetorheological materials can be measured based on the optical transmittance principle | High measurement accuracy, but high concentration samples are easily saturated and the range is limited |
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