Static yield stress of ferrofluid-based magnetorheological fluids

Yang, Yongbo; Li, Lin; Chen, Guang

doi:10.1007/s00397-009-0346-z

Cited by 63 publications

(32 citation statements)

References 17 publications

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“…The magnetorheograms for both MR1 and MR2 characteristically displayed typical MR behavior. It is evident that a threshold shear stress is required to make the initial flow, which is a property of yield 5 stress fluid and this initial stress at very low shear rate (~0.001-0.1) is termed as static yield stress (τ ys ) [2,6,9]. With increasing field, initial stress required to make the fluid flow would also go higher, owing to the formation of more robust field-dependent interparticle network.…”

Section: Magnetorheological Characterizations 321 Steady Shear Magmentioning

confidence: 99%

Dynamic and rate-dependent yielding behavior of Co0.9Ni0.1 microcluster based magnetorheological fluids

Arief

Mukhopadhyay

2016

Journal of Magnetism and Magnetic Materials

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Abstract:In this paper we performed steady shear and oscillatory magnetorheological (MR) studies in magnetic fluids containing CoNi nanoclusters of 450 nm in diameter. Co-rich nanoclusters were synthesized by conventional homogeneous nucleation without any external surfactant or reducing agent in liquid polyol at elevated temperature. The x-ray diffraction, energy dispersive X-Ray analysis, scanning and transmission electron microscopy studies were done for analyzing the sample composition and morphology. Two variants of fluid samples were prepared by dispersing 15 vol% and 20 Vol% of CoNi powders in castor oil. Room temperature steady magnetoshear studies indicate viscoplastic behavior with stronger dependence of static yield stress on magnetization than a dipolar coupling that was operational in the dynamic yield stress. Magnetosweep measurements at constant shear rate showed interesting relaxation at high magnetic fields. We also explored dynamical elastic behavior through oscillatory magnetorheological studies under both strain sweep and frequency sweep modes, and showed glass transition like phenomenon occurring in them above critical shear amplitudes.

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Section: Magnetorheological Characterizations 321 Steady Shear Magmentioning

confidence: 99%

Dynamic and rate-dependent yielding behavior of Co0.9Ni0.1 microcluster based magnetorheological fluids

Arief

Mukhopadhyay

2016

Journal of Magnetism and Magnetic Materials

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“…However, sometimes these processes hinder the formation of chains, which is one of the most important properties of MR effect. Recently, it was demonstrated that the use of magnetite ferrofluid as carrier media is an effective way of reducing the sedimentation of micron sized particles of an MR fluid [7][8][9]. Some unusual light scattering in magnetic nanofluid based MR fluid was also demonstrated recently [10][11][12].…”

Section: Introductionmentioning

confidence: 96%

Mechanism of chain formation in nanofluid based MR fluids

Patel

2011

Journal of Magnetism and Magnetic Materials

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“…The Eqs. (44) and (45) are equivalent to those studied by Liu's group 47,48 for magnetic liquids (where ε xz = 0), when we use the identification 2c R 2 = λ 2 and take β = 0. For the elastic degree of freedom we get…”

Section: B Effects Of Normal Pressurementioning

confidence: 99%

Continuum model of magnetic field induced viscoelasticity in magnetorheological fluids

Potisk

Svenšek

Pleiner

et al. 2019

The Journal of Chemical Physics

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An effective macroscopic model of magnetorheological fluids in the viscoelastic regime is proposed. Under the application of an external magnetic field, columns of magnetizable particles are formed in these systems. The columns are responsible for solid-like properties, such as the existence of elastic shear modulus and yield stress, and are captured by the strain field, while magnetic properties are described by the magnetization. We investigate the interplay of these variables when static shear or normal pressure is imposed in the presence of the external magnetic field. By assuming a relaxing strain field, we calculate the flow curves, i.e. the shear stress as a function of the imposed shear rate, for different values of the applied magnetic field. Focusing on the small amplitude oscillatory shear we study the complex shear modulus, i.e. the storage and the loss moduli, as a function of the frequency. We demonstrate that already such a minimal model is capable of furnishing many of the key physical features of these systems, like yield stress, enhancement of the shear yield stress by pressure, threshold behavior in the spirit of the frequently employed Bingham law and several features in the frequency dependence of storage and loss moduli.

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Static yield stress of ferrofluid-based magnetorheological fluids

Cited by 63 publications

References 17 publications

Dynamic and rate-dependent yielding behavior of Co0.9Ni0.1 microcluster based magnetorheological fluids

Dynamic and rate-dependent yielding behavior of Co0.9Ni0.1 microcluster based magnetorheological fluids

Mechanism of chain formation in nanofluid based MR fluids

Continuum model of magnetic field induced viscoelasticity in magnetorheological fluids

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