Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: Polymer Networks and Elastomers
CPP 38.3: Talk
Wednesday, April 3, 2019, 12:00–12:15, H18
Reversible magnetomechanical collapse in a soft elastic matrix — Mate Puljiz1, Shilin Huang2, Karl A. Kalina3, Johannes Nowak3, Stefan Odenbach3, Markus Kästner3, Günter K. Auernhammer2, and •Andreas M. Menzel1 — 1Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany — 2Max-Planck-Institut für Polymerforschung, Mainz, Germany — 3Technische Universität Dresden, Dresden, Germany
Embedding rigid particles in an elastic matrix hinders their motion. Under mutual attraction, their displacement leads to elastic deformations of the elastic environment. Counteracting restoring forces result.
Nevertheless, as we demonstrate, a reversible particle approach up to virtual touching is possible. For this purpose, the behavior of magnetizable nickel particles in a soft elastic gel matrix was analyzed in experiments [1]. Switching on and off an external magnetic field, the particles reversibly collapse towards each other and subsequently reseparate. Explicit analytical calculations and finite-element simulations describe and quantify these experimental observations [1].
The effect should be interesting from an application point of view. In magnetorheological elastomers, the overall material stiffness can be reversibly tuned by external magnetic fields acting on embedded magnetizable particles [2]. Induced formation of chain-like aggregates is possible. An associated material stiffening could be maximized by induced virtual touching of the embedded particles.
[1] M. Puljiz et al., Soft Matter 14, 6809 (2018).
[2] G. Pessot et al., J. Phys.: Condens. Matter 30, 125101 (2018).