Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 5: Polymer Networks and Dynamics I: Elastomers and Magnetic Materials
CPP 5.9: Vortrag
Montag, 20. März 2017, 12:45–13:00, ZEU 255
Modeling bidisperse soft magnetic elastomers — •Pedro A. Sánchez1, Sofia S. Kantorovich1,2, Oleg V. Stolbov3, and Yuriy L. Raikher3 — 1Computational Physics, University of Vienna, Sensengasse 8/18, 1090 Vienna, austria — 2Ural Federal University, 3 Ural Federal University, Lenin av. 51, Ekaterinburg, 620000, Russia — 3Institute of Continuous Media Mechanics, Ural Division of RAS, 1 Korolyov street, Perm, 614013, Russia
Soft magnetic elastomers are a type of hybrid materials consisting of a soft matrix of polymers in which a high volume fraction of magnetic micro- and/or nanoparticles are embedded. The elastic modulus of the polymer matrix is low enough to allow strong structural changes in the system induced by the response of the magnetic particles to external magnetic fields. These novel materials are promising candidates for a broad range of applications, like magnetically controlled dampers, magnetic field sensors, flow regulators or microfluidic pumps.
Here we present a bead-spring model of a soft magnetic elastomer material in which a combination of two types of magnetic particles are present within the polymer matrix: a low volume fraction of magnetically hard colloids—typically, ferromagnetic particles with diameters of 3-5 µm—and a high volumen fraction of weak magnetic particles—typically paramagnetic particles with a diameter of around 10nm. We analyze the magnetic response of this system by means of extensive computer simulations, and connect our results to analytical models based on continuum approaches.