Effect of surface treatment on magnetorheological characteristics of core-shell structured soft magnetic carbonyl iron particles

Ahn, Woo Jin; Jung, Han-Bo; Kwon, Seung Hyuk; Hong, Cheng; Choi, Hyoung Jin

doi:10.1007/s00396-015-3669-6

Cited by 17 publications

(8 citation statements)

References 42 publications

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“…Furthermore, AL/CTS dual-coated layers produced a relative rough surface and decreased the average density of MPs, which can weaken the aggregation among MPs, thereby enhancing their dispersion and redispersion stability. Additionally, the dispersion stability of AL(H)/CTS-CI MPs was compared with the results of the CI-based composites proposed by Ahn et al (2015) and Liu et al (2015b). As a consequence, the AL(H)/CTS-CI MPs shows an superior MR properties and dispersion stability, indicating that the as-prepared AL(H)/CTS-CI MPs have an extensive prospect in the field of intelligent sensing.…”

Section: Resultsmentioning

confidence: 96%

Production, deformation and magnetorheological characteristics of the alginate/chitosan hydrogel magnetic microspheres

Wan

Tian

et al. 2021

Journal of Intelligent Material Systems and Structures

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To improve dispersion stability and magnetorheological (MR) characteristics of carbonyl iron (CI) particles, we proposed novel hydrogel magnetic microspheres (MPs) dual-coated with alginate (AL) and chitosan (CTS) for the first time. The double-network structures formed by biological crosslinking and chelation reactions are capable to enhance its own structural stability and mechanical properties. The structural characterization, MR properties, and dispersion stability for different MPs were investigated. Additionally, the swelling behaviors were studied by swelling the dried MPs in the deionized water and sodium chloride solution, respectively. The results showed that the AL/CTS hydrogel core/shell MPs displayed the advantages of simple manufacturing, superior MR properties and deformability compared to pure micron-sized CI particles, indicating the improved dispersion stability of the MR fluids compared to that of the pure CI particles-based MR fluids. The introduction of double network structures with natural biopolymers will provide a new thought for the development of MR materials.

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Section: Resultsmentioning

confidence: 96%

Production, deformation and magnetorheological characteristics of the alginate/chitosan hydrogel magnetic microspheres

Wan

Tian

et al. 2021

Journal of Intelligent Material Systems and Structures

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“…However, when the magnetic field strength increased to 365 kA/m, a sudden rise in shear stress was observed for the MRFs. Estimates (Ahn et al, 2015; Kim et al, 2016) show that with the increasing magnetic field, the magnetic field could cause aggregation and formation of chain-like or drop-like structures, which leads to significant increase in viscosity and shear stress for the MRF. Obviously, the appearance of heterogeneous structures could affect the magnetorheological effects of the MRF.…”

Section: Resultsmentioning

confidence: 99%

Magnetorheological fluid based on amorphous Fe-Si-B alloy magnetic particles

Yang

Liu

Pei

et al. 2021

Journal of Intelligent Material Systems and Structures

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Magnetorheological fluids (MRFs) based on amorphous Fe-Si-B alloy magnetic particles were prepared. The influence of annealing treatment on stability and rheological property of MRFs was investigated. The saturation magnetization ( Ms) of amorphous Fe-Si-B particles after annealing at 550°C is 131.5 emu/g, which is higher than that of amorphous Fe-Si-B particles without annealing. Moreover, the stability of MRF with annealed amorphous Fe-Si-B particles is better than that of MRF without annealed amorphous Fe-Si-B particles. Stearic acid at 3 wt% was added to the MRF2 to enhance the fluid stability to greater than 90%. In addition, the rheological properties demonstrate that the prepared amorphous particle MRF shows relatively strong magnetic responsiveness, especially when the magnetic field strength reaches 365 kA/m. As the magnetic field intensified, the yield stress increased dramatically and followed the Herschel-Bulkley model.

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“…The lower the sedimentation ratio is, the better the dispersion stability is. It is obvious that dual-coated layers and nanoparticles significantly affect the dispersion stability of MR fluids, and the sedimentation ratio for CI@Fe 3 O 4 @G@GO particles is lower than 7.00%, which is superior to many MR fluids in the literature [35,36]. …”

Section: Resultsmentioning

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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Effect of surface treatment on magnetorheological characteristics of core-shell structured soft magnetic carbonyl iron particles

Cited by 17 publications

References 42 publications

Production, deformation and magnetorheological characteristics of the alginate/chitosan hydrogel magnetic microspheres

Production, deformation and magnetorheological characteristics of the alginate/chitosan hydrogel magnetic microspheres

Magnetorheological fluid based on amorphous Fe-Si-B alloy magnetic particles

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

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