Performance of bidisperse magnetorheological fluids utilizing superparamagnetic maghemite nanoparticles

Leong, Siti Asma’ Nikmat; Mazlan, Saiful Amri; Samin, Pakharuddin Mohd; Idris, Ani; Ubaidillah, Ubaidillah

doi:10.1063/1.4941516

Cited by 16 publications

(14 citation statements)

References 11 publications

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“…θ is the Bragg's angle, and β is the full width at half maximum (FWHM) of the peak. The lattice constant (a) of nanoparticle Sr-CoFe 2 O 4 was calculated using Equation (2). Where h, k, and l are Miller indices [35].…”

Section: Resultsmentioning

confidence: 99%

“…However, various studies have shown that there is an optimum concentration of nanoparticles that can be added to MRF. At certain concentrations, the addition of nanoparticles can reduce the shear stress of MRF [2,60]. Therefore, it is necessary to conduct further research on the optimum concentration of Sr-CoFe 2 O 4 nanoparticles which can increase MRF properties, and it is necessary to study whether the size of the nanoparticles will affect the optimum concentration of nanoparticles.…”

Section: Sr =mentioning

confidence: 99%

“…Magnetorheological fluid (MRF) is a smart material that contains micron-sized magnetic particles dispersed in silicone oil, a non-magnetic carrier fluid [1,2]. Although MRFs has a liquid-like structure in their normal state, they can transform to a solid-like structure in milliseconds when an external magnetic field is introduced and revert to their liquid-like structure when the external magnetic field is removed [3].…”

Section: Introductionmentioning

confidence: 99%

“…The use of hard magnetic materials as nano-additives in MRF has received considerable attention in recent times [2,[27][28][29]. One such material is cobalt ferrite (CoFe 2 O 4 ), a hard magnetic material with good oxidation stability, high Currie points, many magnetostrictive properties, and high mechanical properties [30,31].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Sr-CoFe2O4 Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid

et al. 2021

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This study investigated the effect of adding strontium (Sr)-doped cobalt ferrite (CoFe2O4) nanoparticles in carbonyl iron particle (CIP)-based magnetorheological fluids (MRFs). Sr-CoFe2O4 nanoparticles were fabricated at different particle sizes using co-precipitation at calcination temperatures of 300 and 400 °C. Field emission scanning electron microscopy (FESEM) was used to evaluate the morphology of the Sr-CoFe2O4 nanoparticles, which were found to be spherical. The average grain sizes were 71–91 nm and 118–157 nm for nanoparticles that had been calcinated at 300 and 400 °C, respectively. As such, higher calcination temperatures were found to produce larger-sized Sr-CoFe2O4 nanoparticles. To investigate the rheological effects that Sr-CoFe2O4 nanoparticles have on CIP-based MRF, three MRF samples were prepared: (1) CIP-based MRF without nanoparticle additives (CIP-based MRF), (2) CIP-based MRF with Sr-CoFe2O4 nanoparticles calcinated at 300 °C (MRF CIP+Sr-CoFe2O4-T300), and (3) CIP-based MRF with Sr-CoFe2O4 nanoparticles calcinated at 400 °C (MRF CIP+Sr-CoFe2O4-T400). The rheological properties of these MRF samples were then observed at room temperature using a rheometer with a parallel plate at a gap of 1 mm. Dispersion stability tests were also performed to determine the sedimentation ratio of the three CIP-based MRF samples.

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Section: Resultsmentioning

confidence: 99%

Section: Sr =mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Sr-CoFe2O4 Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid

et al. 2021

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“…Leong et al [21] prepared bidisperse magnetic particles (BMP) composed of γ -Fe 2 O 3 nanoparticles with an average size of 9 nm and carbonyl iron (CI) particles to investigate the rheological properties and sedimentation rate of the MR fluids. Wereley et al [22] attemped to find an optimal composition of micron-sized and nanosized Fe particles to provide the best combination of high yield stress and low sedimentation rate for bidisperse MR fluids.…”

Section: Introductionmentioning

confidence: 99%

Bidisperse Magnetic Particles Coated with Gelatin and Graphite Oxide: Magnetorheology, Dispersion Stability, and the Nanoparticle-Enhancing Effect

Yao

Zhao

et al. 2018

Nanomaterials

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The magnetorheology and dispersion stability of bidisperse magnetic particles (BMP)-based magnetorheological (MR) fluids were improved by applying a novel functional coating composed of gelatin and graphite oxide (GO) to the surfaces of the micron-sized carbonyl iron (CI) and nanoparticles Fe3O4. Gelatin acted as a grafting agent to reduce the aggregation and sedimentation of CI particles and prevent nanoparticles Fe3O4 from oxidation. In addition, a dense GO network on the surface of gelatin-coated BMP was synthesized by self-assembly to possess a better MR performance and redispersibility. The rheological properties of MR fluids containing dual-coated BMP were measured by a rotational rheometer under the presence of magnetic field and their dispersion stability was examined through sedimentation tests. The results showed that CI@Fe3O4@Gelatin@GO (CI@Fe3O4@G@GO) particles possessed enhanced MR properties and dispersion stability. In addition, the nanoparticle-enhancing effects on the dispersion stability of BMP-based MR fluids were investigated using Monte Carlo simulations.

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Magnetorheology of Bimodal Fluids in the Single–Multidomain Limit

Morillas

Bombard

Vicente

2018

Ind. Eng. Chem. Res.

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In this manuscript we investigate the shear rheology, sedimentation stability and redispersibility characteristics of bimodal MR fluids with a large-to-small size ratio σL/σS ≈ 100 where the small-size population of particles is in the single–multidomain limit (σS ≈ 100 nm) to promote the formation of core–shell supraparticles (i.e., large particles surrounded by the smaller ones). We focus on the effect of mixing the two kinds of particles in different proportions while keeping either the large particle volume fraction or the total volume fraction constant. Five different nanoparticles, having different chemical compositions and shapes, are investigated in this work: barium ferrite, magnetite, iron, chromium dioxide, and goethite. The results demonstrate that nanoparticles fill the voids between microparticles, and this locally enhances the magnetic field. The on-state yield stress and effective enhancement may increase or decrease depending on the magnetization of the nanoparticles as compared to that of the microparticles. An enhanced MR effect is experimentally observed and also simulated with finite element methods, when the magnetization of the nanoparticles is larger than that of the microparticles. Bimodal MR fluids exhibit better penetration and redispersibility response than the monomodal counterparts and dimorphic magnetorheological fluids based on nanofibers.

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Performance of bidisperse magnetorheological fluids utilizing superparamagnetic maghemite nanoparticles

Cited by 16 publications

References 11 publications

The Effect of Sr-CoFe2O4 Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid

The Effect of Sr-CoFe2O4 Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid

Bidisperse Magnetic Particles Coated with Gelatin and Graphite Oxide: Magnetorheology, Dispersion Stability, and the Nanoparticle-Enhancing Effect

Magnetorheology of Bimodal Fluids in the Single–Multidomain Limit

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