Abstract
Magnetic soft materials containing solid state magnetic particles demonstrate various motions and magnetorheological behavior in response to magnetic fields. When a rotational magnetic field is applied to magnetic gels containing with magnetized particles, the magnetic gels exhibit rotational motion. When a non-uniform magnetic field is applied to magnetic gels, the elongation of magnetic gels is observed. The rotational motion of magnetic gels can be applied to a fluid pump that delivers water in straight and spiral tubes. A bead of magnetic gels loaded with drugs undergoes accelerated drug release depending on the rotation rates. The elongational motion of magnetic gels can be applied to an elongation-contraction actuator or a microvalve. Under uniform magnetic fields, the magnetic gels show variable viscoelastic behavior depending on the field-strength, which is called the magnetorheological effect. The dynamic modulus of magnetic hydrogels increases by two orders of magnitude synchronized with magnetic fields. The magnetorheological effect of magnetic gels can be applied to haptic devices or intelligent dampers. Actuators and magnetorheological effects of magnetic soft materials consisting of solid state magnetic particles are described.
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Acknowledgement
This research was partially supported by a Grant-in-Aid for Scientific Research of Priority Areas 438 from Next-Generation Actuators Leading Breakthroughs and a Grand-in-Aid for Scientific Research (B) (Proposal No. 23360051). The author is grateful for Dr. T. Okazaki of Bando Chemicals, Mr. T. Hojo and Mr. K. Yamamoto of Panasonic Electric Works for valuable discussion.
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Mitsumata, T. (2019). Magnetic Particle Composite Gels. In: Asaka, K., Okuzaki, H. (eds) Soft Actuators. Springer, Singapore. https://doi.org/10.1007/978-981-13-6850-9_21
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DOI: https://doi.org/10.1007/978-981-13-6850-9_21
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