Experimental analysis reveals non-monotonic shear stress behaviors in diluted magnetic suspensions with nanoparticles and microparticles, suggesting distinct responses depending on particle aggregates
The study conducts an experimental analysis of the response of diluted magnetic suspensions with nano- and micro-sized particles structured in an external magnetic field to a quasi-static shear strain applied perpendicular to the direction of the external magnetic field. Magnetic rheometry is used as the research method. For microparticle-based composites, X-ray computed microtomography is used to evaluate qualitatively the morphology of particle aggregates induced in the suspension. It is found that a structured magnetic suspension based on nanoparticles with a volume concentration of around 1–2% demonstrates a non-monotonic response with an overshoot. Conversely, more concentrated suspensions with nanoparticles as well as suspensions of microparticles with a similar particle volume fractions exhibit monotonic dependencies of shear stress on quasi-static shear strain. A non-monotonic stress–strain relationship was also observed for highly diluted suspensions of magnetic microparticles ( ~ ∼ 0.1%) under certain experimental conditions. The results obtained form the basis for refining, further developing, and testing the corresponding theoretical concepts.
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Dmitry Borin (2026) studied this question.