Magnetic and Tunable Sound Absorption Properties of an In-Situ Prepared Magnetorheological Foam

Muhazeli, Noor Sahirah; Nordin, Nur Azmah; Ubaidillah, Ubaidillah; Mazlan, Saiful Amri; Aziz, Siti Aishah Abdul; Nazmi, Nurhazimah; Yahya, Iwan

doi:10.3390/ma13245637

Cited by 15 publications

(9 citation statements)

References 38 publications

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“…Similar phenomenon of the pores elongation has been stated in previous study but it was related to the sounds wave that passed through the MR foam. The absorbed sound is forced to oscillate at the frequency of sound waves that caused the elongation of the pores in the MR foam [30]. In fact, the elongation of pores is also expected due to pressure within the MR foam that increased with temperatures.…”

Section: Magnetostriction Of Pu Foam and Mr Foam At Different Operati...mentioning

confidence: 99%

Correlation Between Temperature Changes and Magnetostrictions in Magnetorheological Foam

Senin

Nordin

Mazlan

et al. 2023

Preprint

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Magnetorheological (MR) foam has been identified as a potential magnetostrictive material due to high flexibility and rapid responsiveness towards applied magnetic fields. However, to date, the effect of MR foam at different temperatures has not yet been discovered. Since most devices have tendency to experience raise in temperature during operating system, this might affect characteristics and magnetostriction performance of magnetostrictive material. Therefore, this study aimed to investigate the effect of temperatures between 25 to 50oC on magnetostriction of MR foam, at magnetic fields ranging from 0 to 0.7T. Two samples were prepared which were PU foam and MR foam. During off-state (0T), both samples has reduced in dimension, by about 0.03–0.04% at increasing temperatures from 25 to 35oC. Then, both samples experienced expansion in dimensions at temperatures between 35 to 50oC, by 0.06% and 0.04% for PU and MR foams, respectively. Meanwhile, at on-state (0.1 to 0.7T), similar trends were observed in which the transition from decreased to increase in magnetostrictions occurred at 35oC. The phenomenon is due to the soft-segment and hard-segment in the polymer matrix that have been affected, within the temperature ranges of 25-35oC and 35-50oC respectively, which caused the negative and positive magnetostrictions of both samples.

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Section: Magnetostriction Of Pu Foam and Mr Foam At Different Operati...mentioning

confidence: 99%

Correlation Between Temperature Changes and Magnetostrictions in Magnetorheological Foam

Senin

Nordin

Mazlan

et al. 2023

Preprint

Self Cite

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“…In order to address more potential applications of MR foam, researchers have examined the rheological properties of the material in terms of capability to store more energy upon applied shear stress before fracture. In addition, the enhancement of the storage modulus of MR foam has become a significant concern in order to broader its stiffness range for various purposes (Muhazeli et al, 2020). Theoretically, the storage modulus, G′, is a term for the amount of energy stored in a viscoelastic material before distorting, which refers to the stiffness of the material (Boczkowska et al, 2012;Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Stiffness enhancement of magnetorheological foam by structural modification using silica nanoparticles additive

et al. 2022

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Magnetorheological (MR) foam is a newly developed porous smart material that is able to change its properties continuously, actively, and reversibly in response to controllable external magnetic stimuli. Unfortunately, the stiffness or also known as storage modulus of MR foam is still rather low and insufficient, in the range of below 100 kPa only, due to weak interparticle interaction between CIPs and the foam matrix, which consequently restricts the potential of MR foam to be used in future sensor applications or in other semi-active devices. Therefore, the aim of this research is to enhance the structural and storage modulus of MR foam by adding silica nanoparticles as an additive. Consequently, MR foam samples with different compositions of silica nanoparticles in the range of 0–5 wt% were prepared via an in situ method. The rheological properties were tested under an oscillatory shear mode with the absence and presence of magnetic fields using a rheometer, with the input parameters of strains between 0.001% and 10% and range of magnetic flux density between 0 and 0.73 T for a magnetic field sweep test. The rheological findings show that with the addition of silica nanoparticles, particularly at 4 wt%, have enhanced the storage modulus of MR foam by 260%, which attributed to the highest stiffness from 45 to 162 kPa. Meanwhile, the change of storage modulus under the influence of magnetic fields (0 T–0.73 T) somehow showed small increment, about ∆1 kPa for each concentration of silica nanoparticles in MR foams, due to non-magnetic behavior of silica. The morphological characteristics of MR foams were described by an elemental analysis carried out by a using variable pressure scanning electron microscope (VPSEM) equipped with energy dispersive x-ray spectroscopy (EDX). The micrographs demonstrated large open-cell pores for MR foam, while MR foam with silica nanoparticles exhibited more closed-cell pores, associated with the enhancement of its storage modulus. It indicates that the silica nanoparticles have encouraged well dispersion of the particles in the foam matrix, which improved and strengthened the microstructure of MR foams through formation of silane coupling bonds of silica in the filler-matrix structure. Overall, incorporation of silica nanoparticles as an additive in the MR foam could provide advantage in enhancing the structure and mechanical properties of MR foam, for various future smart devices.

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“…Shen et al [ 20 ] and Baev et al [ 21 ] investigated the acoustic properties of MRFs in an applied magnetic field. Zielinski et al [ 22 ] and Muhazeli et al [ 23 ] investigated the acoustic absorption properties of foams coped with MRFs under magnetic fields, and found that the sound absorption frequency of the foams could be manipulated by varying the magnetic field. Yan et al [ 24 ] fabricated a phononic crystal (PnC) structure comprising periodically arranged hollow pillars filled with MRF, and the results showed that MRF filling could control the frequency range at the bandgap and passband of the PnC plate.…”

Section: Introductionmentioning

confidence: 99%

Influence of Magnetic Field on Sound Transmission Loss of the Unit Filled with Magnetorheological Fluid

Wang

2022

Materials

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To explore the feasibility of applying magnetorheological fluids (MRFs) in the field of noise control, the influence of the magnetic field intensity and direction on the sound transmission loss (STL) of a unit filled with MRF (MRF unit) were investigated in this study. First, two types of test sample containing the MRF unit were designed and fabricated. The magnetic field applied to the MRF was provided by the permanent magnets used in pairs. The direction of the magnetic field was perpendicular or parallel to the direction of the sound wave propagation. The distribution of the magnetic field intensity of the two types of test samples was simulated using magnetostatic finite element analysis and validated with the magnetic field intensity measured using a Teslameter. For comparison, test samples containing air and water units were also prepared. Then, the STL of the two types of test samples were measured under different magnetic field intensities using the impedance tube method. Finally, the STL curves of the two types of test samples were presented, and the influence of magnetic field intensity and direction on the STL were discussed. The results demonstrate that the magnetic field direction has a significant influence on the STL of the MRF unit. In addition, when the magnetic field direction is parallel to the sound propagation direction, the STL of the test sample containing MRF unit significantly increases with the increase of the magnetic field intensity at low and middle frequencies.

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Magnetic and Tunable Sound Absorption Properties of an In-Situ Prepared Magnetorheological Foam

Cited by 15 publications

References 38 publications

Correlation Between Temperature Changes and Magnetostrictions in Magnetorheological Foam

Correlation Between Temperature Changes and Magnetostrictions in Magnetorheological Foam

Stiffness enhancement of magnetorheological foam by structural modification using silica nanoparticles additive

Influence of Magnetic Field on Sound Transmission Loss of the Unit Filled with Magnetorheological Fluid

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