Contribution of the positional and orientational ordering in anisotropic particle-based MR fluids: static and dynamic rheological study

Pisuwala, Mujiba S.; Parekh, Kinnari; Upadhyay, R. V.

doi:10.1007/s00397-020-01251-3

Cited by 7 publications

(8 citation statements)

References 35 publications

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“…The results show that with increasing the nanoparticle concentration, the friction force decreases and the orientational ordering improves. This result is further supported by the small-strain-oscillatory study [20]. However, the equation (5) predicts, static yield stress value only.…”

Section: Introductionsupporting

confidence: 58%

“…It was shown that enhanced MR effect is attributed to strong inter-particle interaction and it is more dominated at low magnetic field strength. Later, Pisuwalla et al [20] have given a detailed study on influence of these friction on positional and orientational ordering in anisotropic particle based MR fluid. This demands the applicability of the present model to this kind of a system.…”

Section: Dynamic Yield Stress From Flow Curvementioning

confidence: 99%

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Modeling, measurements and validation of magnetic field dependent flow behavior of magnetorheological fluids; static and dynamic yield stress

Upadhyay¹,

Choi²

2021

Smart Mater. Struct.

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The issue which is always debated in the magnetorheological (MR) fluid is the dynamic and static yield stress values obtained from a flow curve. To evaluate these, a suitable constitutive equations are required. The aim of this article is to provide suitable rheological models for the prediction of static and dynamic yield stress from a single flow curve under wide shear rate and magnetic field ranges. The proposed model is well suited for isotropic and anisotropic particle-based MR fluids. The parameters, like yield stress, critical shear rate and viscosity at high shear rate obtained from the fit show systematic variation with applied magnetic field strength. These variations in the parameters can be related to the mesostructure formation and its influence on the MR suspension rheological properties. To further confirm the value of the static yield stress derived from the proposed model, the small-strain oscillatory shear flow experiment is carried out and the static yield stress values are obtained. These values agree well with that obtained from the proposed model. Similarly, to evaluate the dynamic yield stress from the flow curve, modified three parameter model applied to soft glassy materials is used. Here, the critical shear rate parameter obtained from the proposed model is used to deduce dynamic yield stress. It is identified that the values obtained are lower than the static yield stress. Furthermore, at low magnetic field, the static and dynamic yield stress follows the relationship defined by the square dependence of the magnetic field strength. The difference between the static and dynamic yield stress values at high field is greater for anisotropic particle based MR fluid than isotropic particle based MR fluid. This reflects the contribution of particle-particle and particle-carrier interaction in the value of the yield stress in anisotropic particle based MR fluid. Thus, the present model provides a clear idea of the dissipation process that occurs in a shear MR fluid.

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Section: Introductionsupporting

confidence: 58%

Section: Dynamic Yield Stress From Flow Curvementioning

confidence: 99%

Modeling, measurements and validation of magnetic field dependent flow behavior of magnetorheological fluids; static and dynamic yield stress

Upadhyay¹,

Choi²

2021

Smart Mater. Struct.

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“…Magnetorheological fluids (MRFs) as a smart material, has reversible and adjustable rheological properties under the stimulation of magnetic field. These characteristics can be attributed to the appearance and disappearance of chain-like microstructure due to the strength of magnetic dipole-dipole interactions [5,6]. Such characteristics make MRFs have broad application prospects in specific fields such as MRFs smart dampers, shock absorbers, and cancer targeted therapy, etc [7,8].…”

Section: Introductionmentioning

confidence: 99%

Magnetorheological properties of Fe–Co nanoparticles with high saturation magnetization and low coercivity

Du¹,

Zhao²,

Tong³

et al. 2023

Nanotechnology

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Fe-Co alloys exhibit an excellent saturation magnetization, which makes them become a potential candidate for the high property magnetic particles in magnetorheological fluids (MRFs). How to decrease their coercivity and residual magnetization without sacrificing the saturation magnetization is a crucial problem to be solved. In this study, Fe-Co nanoparticles were prepared by DC arc discharge and further disposed through low temperature annealing in Ar atmosphere. The successful synthesis of Fe-Co nanoparticles was proved by XRD and EDS. The VSM results revealed that the prepared Fe-Co nanoparticles had a saturation magnetization of 208 emu/g, while the coercivity and remanent magnetization were 58 Oe and 5.8 emu/g, respectively. The MR properties of Fe-Co nanoparticles based MRFs (FeCoNP-MRFs) with 10% particles by volume fraction were systematically investigated. The FeCoNP-MRFs showed up to 4.61 kPa dynamic shear stress at 436 kA/m magnetic field and an excellent reversibility. The MR properties of FeCoNP-MRFs were fitted well by Bingham and power law model, and described by Seo-Seo and Casson fluid model. Meanwhile, the sedimentation ratio of FeCoNP-MRFs was still 87.3% after 72 hours, indicating an excellent sedimentation stability.

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“…10 Consequently, MR fluids have attracted significant attention over the past few decades for use in scientific research and industrial applications because of the potential to connect electronic controls and mechanical systems. 11,12 Numerous traditional mechanical devices, such as brakes, dampers, power steering pumps, and shock absorbers, can benefit from the rapid, controllable, and reversible rheological properties of MR fluids. 13,14 Examples of intelligent devices that may benefit from MR fluids include biomedical devices, precision polishing devices, chemical sensors, and soft gripper actuators.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The reverse structural transition of MR fluids occurs as soon as the magnetic field is removed . Consequently, MR fluids have attracted significant attention over the past few decades for use in scientific research and industrial applications because of the potential to connect electronic controls and mechanical systems. , Numerous traditional mechanical devices, such as brakes, dampers, power steering pumps, and shock absorbers, can benefit from the rapid, controllable, and reversible rheological properties of MR fluids. , Examples of intelligent devices that may benefit from MR fluids include biomedical devices, precision polishing devices, chemical sensors, and soft gripper actuators. , A wide variety of magnetic particles, such as carbonyl iron (CI), iron(II and III) oxide (Fe 3 O 4 ), iron (Fe), and Fe-based alloys, have been applied in MR fluids owing to their good magnetic properties and tunable structures. − …”

Section: Introductionmentioning

confidence: 99%

Magnetorheological Fluids with Surface-Modified Iron Oxide Magnetic Particles with Controlled Size and Shape

Shen

Oda

Matsubara

et al. 2021

ACS Appl. Mater. Interfaces

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This study is focused on surface-modified Fe3O4@SiO2 particles with precisely controlled sizes and shapes applied in magnetorheological (MR) fluids. After the preparation of the monodisperse spindle-shaped and cubic Fe3O4@SiO2 particles, surface modification with dodecyltrimethoxysilane (DTM) was carried out via a silane coupling reaction to increase the dispersion stability of the particles. Afterward, MR fluids were prepared by mixing the DTM-modified Fe3O4@SiO2 particles with silicon oil. Transmission electron microscopy observations demonstrated that spindle-shaped Fe3O4@SiO2 particles could form a more stable chain-like structure than cubic Fe3O4@SiO2 particles upon application of an external magnetic field. The rheological measurements of MR fluids also indicated that the surface modification with DTM, the introduction of anisotropic shapes, and the increase in the particle size all played positive roles in the improvement in MR properties.

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Contribution of the positional and orientational ordering in anisotropic particle-based MR fluids: static and dynamic rheological study

Cited by 7 publications

References 35 publications

Modeling, measurements and validation of magnetic field dependent flow behavior of magnetorheological fluids; static and dynamic yield stress

Modeling, measurements and validation of magnetic field dependent flow behavior of magnetorheological fluids; static and dynamic yield stress

Magnetorheological properties of Fe–Co nanoparticles with high saturation magnetization and low coercivity

Magnetorheological Fluids with Surface-Modified Iron Oxide Magnetic Particles with Controlled Size and Shape

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