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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Poster Session III - Charged Soft Matter and Theory and Simulation

CPP 22.19: Poster

Wednesday, March 24, 2021, 16:30–18:30, CPPp

A mesoscopic approach to magnetostriction of magnetic gels and elastomers — •Lukas Fischer and Andreas M. Menzel — Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany

Our focus is on magnetic gels and elastomers, consisting of rigid magnetizable particles embedded in an elastic polymeric environment. While the particles are discrete objects on the mesoscopic scale, the polymeric body represents an elastic continuum. When magnetized, the particles are subject to magnetic forces and push against the polymeric environment, inducing macroscopic magnetostrictive distortions.

Using analytical theory and numerical evaluations, we determine the overall distortion resulting for different discrete particle arrangements enclosed by a finite-sized, linearly elastic sphere [1–3]. Overall changes in volume and shape are evaluated. In contrast to many other approaches, our formalism includes the basically infinite number of internal degrees of freedom of deformation of the elastic environment.

We assume well-separated particles, all identically magnetized from outside. Depending on the particle arrangement and the compressibility of the elastic material, overall contraction or elongation along the magnetization axis results [1]. Twisted particle structures can lead to overall twist deformations [2], while targeted positioning of particles of different size can tune the overall response [3]. We presume that our approach can support the design of magnetostrictive actuation devices.

[1] L. Fischer and A. M. Menzel, J. Chem. Phys. 151, 114906 (2019).

[2] L. Fischer and A. M. Menzel, Phys. Rev. Research 2, 023383 (2021).

[3] L. Fischer and A. M. Menzel, Smart Mat. Struct. 30, 014003 (2021).