Magnetostrictive polymer composites: Recent advances in materials, structures and properties

Elhajjar, Rani; Law, C. T.; Pegoretti, Alessandro

doi:10.1016/j.pmatsci.2018.02.005

Cited by 116 publications

(60 citation statements)

References 228 publications

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“…Magnetoactive elastomers (MAEs) are promising materials for manufacturing magnetic-field controlled linear actuators [1][2][3][4][5], in particular for soft robotics [6]. They consist of micrometer-sized soft magnetic particles (usually, iron) embedded into a non-magnetic elastomer matrix [7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

et al. 2020

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Elongations of magnetoactive elastomers (MAEs) under ascending–descending uniform magnetic fields were studied experimentally using a laboratory apparatus specifically designed to measure large extensional strains (up to 20%) in compliant MAEs. In the literature, such a phenomenon is usually denoted as giant magnetostriction. The synthesized cylindrical MAE samples were based on polydimethylsiloxane matrices filled with micrometer-sized particles of carbonyl iron. The impact of both the macroscopic shape factor of the samples and their magneto-mechanical characteristics were evaluated. For this purpose, the aspect ratio of the MAE cylindrical samples, the concentration of magnetic particles in MAEs and the effective shear modulus were systematically varied. It was shown that the magnetically induced elongation of MAE cylinders in the maximum magnetic field of about 400 kA/m, applied along the cylinder axis, grew with the increasing aspect ratio. The effect of the sample composition is discussed in terms of magnetic filler rearrangements in magnetic fields and the observed experimental tendencies are rationalized by simple theoretical estimates. The obtained results can be used for the design of new smart materials with magnetic-field-controlled deformation properties, e.g., for soft robotics.

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Section: Introductionmentioning

confidence: 99%

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

et al. 2020

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“…However, most bulk magnetostrictive materials are expensive owing to their rare earth metal ingredients. Their lack of ductility (Duenas and Carman, 2000) has hindered the fabrication of devices with complex shapes and ushered in proposals for various magnetostrictive polymer composites (Elhajjar et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Flexible Magnetostrictive Nanocellulose Membranes for Actuation, Sensing, and Energy Harvesting Applications

et al. 2020

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Magnetostrictive composite known as magnetostrictive nanocellulose membrances (MNMs) were fabricated by embedding Terfeonol-D particles into cellulose nanofibers (CNFs). MNMs inherit flexibility and biodegradability from CNF while exhibiting magnetomechanical responses; as such, the valuable rare-earth (Terfenol-D) particles can be recycled. Various orientations of the Terfenol-D particles were induced in the MNMs, and those with in-plane alignment showed the strongest magnetostrictive effect but the lowest Villari effect. Materials with such a unique combination of properties dovetail nicely with Internet of Things that require ubiquitous sensing, actuation, and energy harvesting in one package.

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“…Smart foams are magnetoelastic (ME) materials that are sensitive to an external magnetic field and exhibit a fast and reversible change in the mechanical response [ 1 ]. The adjustable mechanical properties of ME materials allow for their use in different applications, such as adaptive variable-stiffness devices, soft actuators, and artificial muscles [ 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Reinforced Smart Foams Produced with Time-Profiled Magnetic Fields

et al. 2020

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Polymeric smart foams are lightweight and multifunctional porous materials that are sensitive to the magnetic field due to the presence of magnetic particles embedded in the matrix. Recently, a constant magnetic field has been exploited to align the particles along the magnetic field lines during the formation of the porous structure. In this paper, a new field-structuring process was developed that makes use of a time-profiled magnetic field during the foaming process to control the geometrical features of the particles aggregates. The effects of magnetic field strength as well as the switch-on and switch-off times on the magnetoelastic behavior of the smart foams were investigated. It was proven that the alignment of the particles results in both a strong relative sensitivity to the magnetic field and a positive stress change, whose extent depends on the geometrical features of the developed aggregates.

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Magnetostrictive polymer composites: Recent advances in materials, structures and properties

Cited by 116 publications

References 228 publications

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

Flexible Magnetostrictive Nanocellulose Membranes for Actuation, Sensing, and Energy Harvesting Applications

Reinforced Smart Foams Produced with Time-Profiled Magnetic Fields

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