SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Composites and Functional Polymer Hybrids

CPP 13.7: Talk

Monday, March 27, 2023, 17:00–17:15, ZEU 255

Tuning the thermal conductivity of magnetic gels and elastomers — Gustav J. L. Jäger, •Lukas Fischer, Tyler Lutz, and Andreas M. Menzel — Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany

When an external magnetic field is applied to magnetic gels or elastomers—composite materials consisting of magnetic or magnetizable particles inside an elastic matrix—these materials typically exhibit interesting deformational (magnetostrictive) responses or changes in rheological properties (magnetorheological effect).

We study how the induced magnetic interactions lead to an internal restructuring of the magnetic particles, mainly the formation of particle chains along the direction of the external magnetic field. This behavior is not only connected to the aforementioned effects, it can also change the thermal conductivity of the magnetic gels and elastomers, which we focus on here. We analyze this phenomenon numerically for 2D mesoscopic (particle-resolved) models of magnetic gels and elastomers [1], thus characterizing thin elastic films and membranes.

Our results indicate significant magnetically induced changes in the thermal conductivity. The influence of several parameters on this effect is investigated, such as the density and number of magnetizable particles, the amplitude of their magnetization, and the aspect ratio of the systems. Similar changes in the electric conductivity of magnetic gels and elastomers are expected.
[1] G. J. L. Jäger, L. Fischer, T. Lutz, A. M. Menzel, J. Phys.: Condens. Matter 34, 485101 (2022).