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Journal of Nanomaterials
Volume 2017, Article ID 8605413, 7 pages
https://doi.org/10.1155/2017/8605413
Research Article

Sample Size Effect of Magnetomechanical Response for Magnetic Elastomers by Using Permanent Magnets

1Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
2Japan Science and Technology Agency, ALCA, Tokyo 102-0076, Japan
3School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), Ishikawa 923-1292, Japan
4Department of Biophysics and Radiation Biology, Laboratory of Nanochemistry, Faculty of Medicine, Semmelweis University, Nagyvarad ter 4, Budapest 1089, Hungary

Correspondence should be addressed to Tetsu Mitsumata; pj.ca.u-atagiin.gne@ustet

Received 31 August 2016; Revised 5 December 2016; Accepted 12 December 2016; Published 2 January 2017

Academic Editor: Jean M. Greneche

Copyright © 2017 Tsubasa Oguro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The size effect of magnetomechanical response of chemically cross-linked disk shaped magnetic elastomers placed on a permanent magnet has been investigated by unidirectional compression tests. A cylindrical permanent magnet with a size of 35 mm in diameter and 15 mm in height was used to create the magnetic field. The magnetic field strength was approximately 420 mT at the center of the upper surface of the magnet. The diameter of the magnetoelastic polymer disks was varied from 14 mm to 35 mm, whereas the height was kept constant (5 mm) in the undeformed state. We have studied the influence of the disk diameter on the stress-strain behavior of the magnetoelastic in the presence and in the lack of magnetic field. It was found that the smallest magnetic elastomer with 14 mm diameter did not exhibit measurable magnetomechanical response due to magnetic field. On the opposite, the magnetic elastomers with diameters larger than 30 mm contracted in the direction parallel to the mechanical stress and largely elongated in the perpendicular direction. An explanation is put forward to interpret this size-dependent behavior by taking into account the nonuniform field distribution of magnetic field produced by the permanent magnet.