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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Composites and Functional Polymer Hybrids II

CPP 7.4: Talk

Monday, March 18, 2024, 15:45–16:00, H 0106

Higher-order modes of deformation of magnetic gels and elastomers — •Lukas Fischer and Andreas M. Menzel — Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany

Magnetic gels and elastomers - soft composite materials, consisting of a soft elastic matrix with enclosed magnetizable particles - mainly react to applied external magnetic fields by changing their rheological properties (magnetorheological effect) or by overall deformations (magnetostrictive effect). So far, mostly volume changes and straight elongation or contraction along the magnetic field direction have been the focus of previous studies in the latter case.

For spherical model systems of magnetic gels and elastomers, we evaluate, based on an analytical theory, the magnetostrictive deviation in shape of the surface [1]. We characterize these deformations by a mode expansion, going beyond the previously mentioned deformational modes. The relative importance of the resulting modes crucially depends on the employed arrangement of the magnetizable particles within the elastic material.

Our goal is to offer a collection of those arrangements with their corresponding deformational modes. Therefore, if a certain deformational mode is required, it is possible to choose that arrangement that best suits this need from the collection. In this way, we hope to support the path of these materials towards actual applications.
[1] L. Fischer, A. M. Menzel, arXiv preprint arXiv:2310.16833 (2023).

Keywords: Magnetic gels and elastomers; Magnetostriction; Actuation; Green's function method