SKM 2021 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Soft Matter (joint session CPP/DY)

CPP 7.6: Vortrag

Mittwoch, 29. September 2021, 12:00–12:15, H3

Magnetostrictive effects in soft magnetic gels and elastomers — •Lukas Fischer and Andreas M. Menzel — Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany

Our work focuses on magnetic gels and elastomers, also known as magnetorheological elastomers or ferrogels, that feature a soft elastic matrix enclosing magnetizable particles. These materials react to an applied external magnetic field mainly in a twofold manner: by changing their overall mechanical properties (magnetorheological effect) and by overall macroscopic deformations (magnetostriction).

We have developed a mesoscopic theory to describe the latter effect. For this purpose, we analytically solve the linear elastic problem, linking the particle scale to the scale of overall deformation. To adjust the deformational response, we modify the initial positioning of the particles inside the material, relative to the magnetic field direction [1].

Specific spatial arrangements of the magnetizable particles inside the elastic medium favor specific magnetostrictive modes of deformation, for example torsion [2]. Targeted modification of the particle size can likewise serve to adjust the magnetostrictive response [3]. Our work supports the construction of magnetically controlled soft actuators that are tailored to requested deformational tasks.
[1] L. Fischer, A. M. Menzel, J. Chem. Phys. 151, 114906 (2019).
[2] L. Fischer, A. M. Menzel, Phys. Rev. Research 2, 023383 (2020).
[3] L. Fischer, A. M. Menzel, Smart Mater. Struct. 30, 014003 (2021).