https://doi.org/10.1140/epjs/s11734-026-02232-y
Regular Article
Effect of particle aggregate size on the response of field-structured magnetic suspensions to quasi-static shear
Institute of Mechatronic Engineering, Chair of Magnetofluiddynamics, Measuring and Automation Technology, Technische Universität Dresden, 01062, Dresden, Germany
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Received:
26
November
2025
Accepted:
20
February
2026
Published online:
6
March
2026
Abstract
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.
© The Author(s) 2026
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