Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Complex Fluids and Soft Matter (joint session DY/CPP)

CPP 20.8: Vortrag

Dienstag, 10. März 2026, 11:30–11:45, ZEU/0160

Hydrodynamics substantially affects induced structure formation in magnetic fluids — •Henning Reinken and Andreas M. Menzel — Otto-von-Guericke-Universität Magdeburg, Germany

Magnetorheological fluids consist of micrometer-sized magnetic particles suspended in a carrier liquid [1]. Sufficiently strong external magnetic fields lead to the formation of string-like particle aggregates, which results in complex magnetorheological behavior. This mechanism can further be used in the production of magnetic elastomers during the polymerization process when the carrier medium is still fluid and particulate structure formation still possible [2]. Using numerical simulations that spatially resolve both fluid flows and magnetization, we demonstrate that hydrodynamic interactions play a substantial role during structure formation. Hydrodynamics supports the emergence of string-like aggregates, while magnetic interactions align them. Considering besides this fundamental insight the enormous technical importance and potential of magnetic fluids, our results are substantial also from an application perspective.
We acknowledge support by the German Research Foundation DFG through Research Unit FOR 5599 on structured magnetic elastomers.
[1] S. Odenbach, Arch. Appl. Mech. 86, 269 (2016).
[2] D. Günther, D. Yu Borin, S. Günther, S. Odenbach, Smart Mater. Struct. 21, 015005 (2012).

Keywords: magnetic particles; magnetorheological fluids; hydrodynamic interactions; structure formation