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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 98: Composites and Functional Polymer Hybrids

CPP 98.1: Vortrag

Donnerstag, 19. März 2020, 15:00–15:15, ZEU 114

A mesoscopic approach to magnetostriction of magnetic gels and elastomers — Lukas Fischer and •Andreas M. Menzel — Heinrich-Heine-Universität Düsseldorf, Düsseldorf, 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]. 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, which can play a qualitative role [2].

We assume identical, well-separated particles, all identically magnetized from outside [1]. Depending on the discrete particle arrangement and the compressibility of the elastic material, overall contraction or elongation along the magnetization axis results. For randomized particle arrangements, a trend of elongation along the magnetization axis is found, in line with previous experiments [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] G. Pessot et al., J. Chem. Phys. 141, 124904 (2014).

[3] C. Gollwitzer et al., J. Chem. Phys. 128, 164709 (2008).