Magnetostriction in elastomers with mixtures of magnetically hard and soft microparticles

Autor(en)

Oleg V. Stolbov, Pedro A. Sánchez, Sofia S. Kantorovich, Yuriy L. Raikher

Abstrakt

In this contribution, a magnetoactive elastomer (MAE) of mixed content, i.e., a polymer matrix filled with a mixture of magnetically soft and magnetically hard spherical particles, is considered. The object we focus on is an elementary unit of this composite, for which we take a set consisting of a permanent spherical micromagnet surrounded by an elastomer layer filled with magnetically soft microparticles. We present a comparative treatment of this unit from two essentially different viewpoints. The first one is a coarse-grained molecular dynamics simulation model, which presents the composite as a bead-spring assembly and is able to deliver information of all the microstructural changes of the assembly. The second approach is entirely based on the continuum magnetomechanical description of the system, whose direct yield is the macroscopic field-induced response of the MAE to external field, as this model ignores all the microstructural details of the magnetization process. We find that, differing in certain details, both frameworks are coherent in predicting that a unit comprising magnetically soft and hard particles may display a nontrivial reentrant (prolate/oblate/prolate) axial deformation under variation of the applied field strength. The flexibility of the proposed combination of the two complementary frameworks enables us to look deeper into the manifestation of the magnetic response: with respect to the magnetically soft particles, we compare the linear regime of magnetization to that with saturation, which we describe by the Fröhlich-Kennelly approximation; with respect to the polymer matrix, we analyze the dependence of the reentrant deformation on its rigidity.

Organisation(en)

Forschungsplattform MMM Mathematics-Magnetism-Materials, Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Russian Academy of Sciences, Ural Federal University, Wolfgang Pauli Institute (WPI) Vienna

Seiten

459-480

Anzahl der Seiten

22

DOI

https://doi.org/10.1515/9783110569636-019

Publikationsdatum

12-2020

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 103017 Magnetismus

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Chemie, Allgemeine Physik und Astronomie, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/18021a1e-71e4-4f51-aa65-6f622b1e63de