Enhanced magnetorheology of soft magnetic carbonyl iron suspension with hard magnetic γ-Fe2O3 nanoparticle additive

Jang, Dae Sung; Liu, Ying Dan; Kim, Jung Hyun; Choi, Hyoung Jin

doi:10.1007/s00396-014-3475-6

Cited by 54 publications

(27 citation statements)

References 27 publications

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“…The solid content of the magnetic fluid increases with the increasing of LTLV oxidation time. It reveals that the dispersing ability of the magnetic particles increases with the increasing oxidation time, which demonstrated that the γ-Fe 2 O 3 nanoparticle can increase the dispersing ability of the magnetic particles and decrease the sedimentation of the system [27]. Table 1 To testify further that γ-Fe 2 O 3 can be obtained by changing the oxidation time of Fe 3 O 4 and to demonstrate the relationship between saturation magnetization and oxidation time, magnetic fluids of different mass ratio γ-Fe 2 O 3 /Fe 3 O 4 particles were prepared as shown in Table 2.…”

Section: Dispersing Ability and Magnetic Property Of The Magnetic Parmentioning

confidence: 95%

Effects of γ-Fe2O3 on γ-Fe2O3/Fe3O4 composite magnetic fluid by low-temperature low-vacuum oxidation method

et al. 2016

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Section: Dispersing Ability and Magnetic Property Of The Magnetic Parmentioning

confidence: 95%

Effects of γ-Fe2O3 on γ-Fe2O3/Fe3O4 composite magnetic fluid by low-temperature low-vacuum oxidation method

et al. 2016

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“…However, without a magnetic field, G' shows a similar behavior as a Newtonian fluid, which is dependent on the increasing angular frequency. The graph also shows the leveling increase in the values of G' and G'' as the magnetic field strength increases, indicating a stronger chain formation [29].…”

Section: Resultsmentioning

confidence: 91%

Polyindole-Coated Soft-Magnetic Particles and their Viscoelastic Behaviors under Applied Magnetic Field

Park¹,

Kwon²,

Choi³

et al. 2019

JMAG

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To solve the sedimentation drawback of soft-magnetic carbonyl-iron (CI) particles for their application to a magneto-rheological (MR) fluid, the coating of a polyindole (PIn) onto the surfaces of CI microspheres was introduced through chemical oxidization polymerization using 4-aminobenzoic acid as a grafting chemical to increase the interaction between CI particles and PIn. The coated morphology was confirmed using a scanning electron microscope, whereas the reduced density was examined through a gas pycnometer. The effect of the coating on MR performance was analyzed using a rotation rheometer connected with a magnetic field generator. Based on the results of a dynamic oscillation rheological test, the CI/PIn-based MR fluid exhibited a more elastically solid behavior with the applied magnetic fields when compared to a pure CI-based MR suspension, showing an increased magnetic-field strength-dependent storage modulus from a strain sweep test. With a solid-like behavior under an applied external magnetic field, the storage modulus was observed to be higher than the loss modulus within the entire frequency range.

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“…where τ y is the yield stress, depending on the applied H, shape, and particle concentration, andγ is the shear rate (Choi et al, 2001;Jang et al, 2015). Both K and n are denoted as the consistency index and power-law exponent, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Han et al (2020) used hollow-Fe 3 O 4 particles fabricated using a solvothermal process as an additive to reduce the sedimentation problem and enhance MR properties of CI-based MR fluid. Recently, Jang et al (2015) and Kim et al (2017) added hard-magnetic particles, such as γ-Fe 2 O 3 and CrO 2 , respectively, to CI-based MR fluids and reported improvement in both the MR behavior and suspension stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Magnetorheological Performance of Carbonyl Iron Suspension Added With Barium Ferrite Nanoparticle

Jang

Choi

2021

Front. Mater.

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Hard-magnetic barium ferrite (BF) nanoparticles with a hexagonal plate-like structure were used as an additive to a carbonyl iron (CI) microparticle-based magnetorheological (MR) fluid. The morphology of the pristine CI and CI/BF mixture particles was examined by scanning electron microscopy. The saturation magnetization and coercivity values of each particle were measured in the powder state by vibrating sample magnetometry. The MR characteristics of the CI/BF MR fluid measured using a rotation rheometer under a range of magnetic field strengths were compared with those of the CI-based MR fluid. The flow behavior of both MR fluids was fitted using a Herschel–Bulkley model, and their stress relaxation phenomenon was examined using the Schwarzl equation. The MR fluid with the BF additive showed higher dynamic and elastic yield stresses than the MR fluid without the BF additive as the magnetic field strength increased. Furthermore, the BF nanoparticles embedded in the space between the CI microparticles improved the dispersion stability and the MR performance of the MR fluid.

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Enhanced magnetorheology of soft magnetic carbonyl iron suspension with hard magnetic γ-Fe2O3 nanoparticle additive

Cited by 54 publications

References 27 publications

Effects of γ-Fe2O3 on γ-Fe2O3/Fe3O4 composite magnetic fluid by low-temperature low-vacuum oxidation method

Effects of γ-Fe2O3 on γ-Fe2O3/Fe3O4 composite magnetic fluid by low-temperature low-vacuum oxidation method

Polyindole-Coated Soft-Magnetic Particles and their Viscoelastic Behaviors under Applied Magnetic Field

Enhanced Magnetorheological Performance of Carbonyl Iron Suspension Added With Barium Ferrite Nanoparticle

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