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Effect of Sonication Time on Magnetorheological Effect for Monomodal Magnetic Elastomers

1
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
2
ALCA, Japan Science and Technology Agency, Tokyo 102-0076, Japan
3
Nihon Rufuto Corporation, Tokyo 110-0015, Japan
4
Rigaku Corporation, Tokyo 196-8666, Japan
*
Author to whom correspondence should be addressed.
Received: 11 May 2018 / Revised: 22 May 2018 / Accepted: 22 May 2018 / Published: 23 May 2018
(This article belongs to the Special Issue Magnetic Gels)
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Abstract

The effect of sonication time on the storage modulus and particle morphology for magnetic elastomers was investigated by dynamic viscoelastic measurements and morphological studies. An ultrasonic wave using a homogenizer was irradiated to magnetic liquids containing 70 wt % carbonyl iron, for up to 30 min before cure. SEM photographs revealed that magnetic particles were randomly dispersed in the polyurethane matrix for magnetic elastomers with sonication. A parameter showing nonlinear viscoelasticity for magnetic elastomers with sonication decreased from 0.75 to 0.4, indicating that the aggregations of magnetic particles had been destroyed by the sonication. The storage modulus at 500 mT at the linear viscoelastic regime significantly increased with the irradiation time, reaching saturation after 10 min; this suggests an increase in the number of chains of magnetic particles by sonication, due to the random dispersion of magnetic particles. At high strains, the storage modulus at 500 mT increased by 8.9 kPa by sonication, indicating the number of chains of magnetic particles which were not destroyed by increased sonication. It was also found that the storage modulus for polyurethane elastomers without magnetic particles was not varied by sonication, suggesting that the polyurethane network was not broken. The effect of sonication time on the viscoelastic properties, and on the magnetorheological response for magnetic elastomers, is discussed. View Full-Text
Keywords: stimuli-responsive material; magnetic elastomer; magnetic gel; viscoelastic property; magnetorheology; sonication stimuli-responsive material; magnetic elastomer; magnetic gel; viscoelastic property; magnetorheology; sonication
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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 (CC BY 4.0).
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MDPI and ACS Style

Watanabe, M.; Ikeda, J.; Takeda, Y.; Kawai, M.; Mitsumata, T. Effect of Sonication Time on Magnetorheological Effect for Monomodal Magnetic Elastomers. Gels 2018, 4, 49.

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