Effect of octahedral typed iron oxide particles on magnetorheological behavior of carbonyl iron dispersion

Kwon, Seung Hyuk; Jung, Han-Bo; Choi, Hyoung Jin; Strecker, Zbyněk; Roupec, Jakub

doi:10.1016/j.colsurfa.2018.07.060

Cited by 27 publications

(13 citation statements)

References 42 publications

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“…In the LVE region, the curve of storage modulus against shear strain tends to be flat. Similar results were also obtained in other studies [48][49][50][51]. However, at certain shear strain values, the storage modulus decreased significantly.…”

Section: Resultssupporting

confidence: 91%

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: Resultssupporting

confidence: 91%

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

et al. 2021

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“…Higher FF concentration leads to an excess of FF droplets, which remained in oil and did not interact with CI. In a similar study by Kwon et al, [ 111 ] MRFs with CI and octahedral‐shaped γ‐Fe 2 O 3 (OM) with an edge length of 100 nm (synthesized by a hydrothermal process with iron chloride hexahydrate at 200 °C) exhibited higher shear stress values and sedimentation ratios than MRF with only CI, which the authors attributed to M s of OM (75 emu g −1 ).…”

Section: With Additives‐based Mrfsmentioning

confidence: 84%

Performance and Stability of Magnetorheological Fluids—A Detailed Review of the State of the Art

Thiagarajan

Koh

2021

Adv Eng Mater

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Magnetorheological fluids (MRFs) are functional materials, prepared by dispersing magnetic particles in a nonmagnetic carrier fluid, that exhibit a change in mechanical properties (e.g., increase in viscosity and yield stress) when subjected to a magnetic field. Change in mechanical properties is demonstrated by a fast (i.e., fraction of milliseconds) and reversible transition from a liquid‐ to a solid‐like state. This transition, due to a structural reorganization of magnetic particles in the carrier fluid, makes MRFs a valuable material for damping, breaking systems, medical and prosthetics, and robotics. Since the discovery of MRFs in 1948, developing MRF preparation methods that result in improved performance and the storage without oxidation and settling is paramount. This article presents a review on recent developments in the preparation process of MRFs with a special emphasis on the state of the art in additives and coatings used in enhancing MRF chemical, colloidal, and thermal stability. Recent advances in MRF materials and formulations that have increased yield stress and magnetic properties are discussed. Finally, this review analyses the present‐day challenges in MRF research and makes suggestions for the field to improve MRF stability and performance drawing on previous MRF work and work outside of the fields.

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“…The storage modulus of the MR suspensions increases with the increasing magnetic field shows a constant (stable) plateau region over a wide frequency range at each constant magnetic field strength. Furthermore, the storage modulus is larger than the loss modulus at each constant magnetic field, which indicates the presence of a sturdy solid-like behavior of MR suspensions rather than a liquid-like behavior (Kwon et al, 2018;Wang et al, 2017). The loss modulus for MR suspensions shows a constant plateau only at the lower magnetic field (i.e.…”

Section: Amplitude Sweep Testmentioning

confidence: 92%

“…Magnetorheological (MR) fluids are a suspension of soft micron-size magnetic particles, like carbonyl iron and metal oxide dispersed in nonmagnetic carrier fluids (e.g. mineral oil, water, synthetic oil, and glycol) that have the ability to changes their dynamic properties in the presence of magnetic field (Kwon et al, 2018;Lo´pez-Lo´pez et al, 2006;Maurya et al, 2020;Padalka et al, 2010;Yang et al, 2009Yang et al, , 2016. However, under an applied magnetic field, the MR fluids change their phase from fluid like-state to a solid-like state in several tens of milliseconds due to magneto-polarization between the suspended CI particles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel flake-shaped carbonyl iron and water-based magnetorheological fluids using laponite and oleic acid with enhanced sedimentation stability

Maurya

Sarkar

2021

Journal of Intelligent Material Systems and Structures

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In this study, micron-sized flake shaped carbonyl iron (CI) water-based MR fluids were prepared with adding laponite and oleic acid as an additive and surfactant, respectively. The MR suspensions are comprised of the fixed CI particles and water weight %, while weight % of laponite and oleic acid changes from 1 to 3 wt% and 0.5 to 1.5 wt%, respectively. The remarkable enhancement in magnetorheological properties was obtained with improved sedimentation stability for CI/water MR suspensions with the addition of laponite and oleic acid. It was found that at the lowest magnetic field strength, the higher laponite concentration is effective, while at the highest magnetic field strength, the smaller concentration was effective. It was because of the combined effect of the field-induced CI chains and the laponite clay gel network. Its storage moduli showed a stable plateau area for whole angular frequencies, suggesting distinguished solid-like behavior of the MR fluid. Finally, a novel correlation was obtained between the initial settling rate of the CI particles and magnetorheological behavior of CI/laponite/OA MR suspensions with 1 wt% laponite and 0.5 wt% oleic acid, which has less zero-field, high on-state shear stress with enhanced sedimentation stability. The prepared MR fluids are a reliable industrial application vibration-isolation, clutch, and brake.

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Effect of octahedral typed iron oxide particles on magnetorheological behavior of carbonyl iron dispersion

Cited by 27 publications

References 42 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

Performance and Stability of Magnetorheological Fluids—A Detailed Review of the State of the Art

Synthesis and characterization of novel flake-shaped carbonyl iron and water-based magnetorheological fluids using laponite and oleic acid with enhanced sedimentation stability

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