Polymeric Composite Foams With Properties Controlled by the Magnetic Field

Davino, D.; Mei, Pasquale; Sorrentino, Luigi; Visone, C.

doi:10.1109/tmag.2012.2198634

Cited by 15 publications

(17 citation statements)

References 9 publications

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“…The stress was evaluated along a delay time of 20 min to allow for the stress relaxation of the polymer. After the stress relaxation rate is below 0.01 kPa per minute ( Figure 2B), the magnetoelastic response was evaluated by applying a sinusoidal magnetic field (132 kA/m in strength, 0.05 Hz in frequency) at each fixed prestrain value ( Figure 2C) [14]. tails).…”

Section: Characterizationsmentioning

confidence: 99%

“…In order to overcome the limitations of magnetoelastic solids (i.e., material density higher than 3000 kg/m 3 , high elastic moduli, high viscosity matrix during the particles manipulation by the magnetic field), ME polymeric foams were developed. They combine the lightness of porous structures with the lower magnetic field requirements in order to (a) induce the alignment of the particles (low viscosity matrices) [ 12 , 13 , 14 , 15 , 16 , 17 ] and (b) exploit the peculiar functional properties [ 18 , 19 , 20 , 21 , 22 ], which depend on the polymeric matrix and the degree of porosity of the cellular structure. ME foams open to the possibility of producing lightweight smart structures for applications requiring low forces and large deformations, high sensitivity, and low weight.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Characterizationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reinforced Smart Foams Produced with Time-Profiled Magnetic Fields

et al. 2020

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“…When the MA foam is exposed to an external magnetic field, the magnetic moments of the CIPs will be induced to realign their poles in the same direction as the external magnetic field pole. During this process, the mechanical and rheological properties of the MA foam, such as its storage and loss moduli, can be controlled and adjusted according to the strength of magnetic field due to changes to the microstructure of the material [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…The controllable properties of MA foams have gained a lot of attention for further development through the works of several researchers [ 8 , 9 , 10 , 11 ]. Davino et al [ 8 ] prepared MA foam using 5 wt.% to 25 wt.% of iron (Fe) particles with a size of less than 44 µm. The samples were fabricated in anisotropic condition and analysed under compression modes.…”

Section: Introductionmentioning

confidence: 99%

“…However, to date, the relationship between the mechanical properties of MA foam and changes to its microstructure has remained unclear. Besides, most of the researches into MA foam focused and reported on individual physical quantities like stress [ 8 , 10 , 11 ], storage modulus [ 9 , 12 , 13 ] or magnetostriction [ 14 , 15 ] as summarized in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

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Sensitivities of Rheological Properties of Magnetoactive Foam for Soft Sensor Technology

Norhaniza

Mazlan

Ubaidillah

et al. 2021

Sensors

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Magnetoactive (MA) foam, with its tunable mechanical properties and magnetostriction, has the potential to be used for the development of soft sensor technology. However, researchers have found that its mechanical properties and magnetostriction are morphologically dependent, thereby limiting its capabilities for dexterous manipulation. Thus, in this work, MA foam was developed with additional capabilities for controlling its magnetostriction, normal force, storage modulus, shear stress and torque by manipulating the concentration of carbonyl iron particles (CIPs) and the magnetic field with regard to morphological changes. MA foams were prepared with three weight percentages of CIPs, namely, 35 wt.%, 55 wt.% and 75 wt.%, and three different modes, namely, zero shear, constant shear and various shears. The results showed that the MA foam with 75 wt.% of CIPs enhanced the normal force sensitivity and positive magnetostriction sensitivity by up to 97% and 85%, respectively. Moreover, the sensitivities of the storage modulus, torque and shear stress were 8.97 Pa/mT, 0.021 µN/mT, and 0.0096 Pa/mT, respectively. Meanwhile, the magnetic dipolar interaction between the CIPs was capable of changing the property of MA foam from a positive to a negative magnetostriction under various shear strains with a low loss of energy. Therefore, it is believed that this kind of highly sensitive MA foam can potentially be implemented in future soft sensor systems.

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