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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 42: French-German Session: Nanomaterials, Composites and Hybrids II

CPP 42.3: Vortrag

Mittwoch, 11. März 2026, 17:45–18:00, ZEU/0260

Consequences of the near-field effect in highly filled magneto-active elastomers — •Dirk Romeis and Marina Saphiannikova — Leibniz-Institut für Polymerforschung Dresden

In many theoretical models for magneto-active elastomers (MAEs) the interactions among magnetic/magnetizable particles are approximated via dipole models. In highly filled samples, as well as in structured MAEs, the particles are often very close to each other. In such situation the dipole approximation largely underestimates the interactions among magnetizable particles. Yet, for only 2 spherical particles the analytic solution is quite complex, resulting in a slowly converging series expansion. When considering many particle systems only computationally elaborate methods like a finite element approach can provide numerical solutions. Based on a compact fitting function for the 2-body problem, we suggest an accurate approximation for many-body systems including the near-field effect beyond dipole interactions. Considering these corrections due to the near-field effect in comparison to the dipole approximation, we further investigate the role of cluster formation and dispersion of particles in MAEs when an external magnetic field is applied or switched off.

Keywords: Magneto-active elastomers; Particle clustering in elastomers; Magnetic interactions; Near field effect; Cluster formation