Magnetorheology: Fluids, Structures and Rheology

Bossis, Georges; Volkova, Olga; Lacis, S.; Meunier, Alain

doi:10.1007/3-540-45646-5_11

Cited by 215 publications

(288 citation statements)

References 84 publications

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“…The continuous solid lines are the respective results of the kinetic equation (1). It appears that this equation reproduces quite well the numerical simulation except for the smallest sizes.…”

Section: Results Of 2d Simulation and The Effect Of The Cell Sizesupporting

confidence: 55%

“…The relative velocity v ij is given by the product of the relative mobility, which is proportional to 1/i + 1/j, by the force between two aggregates which is proportional to m 2 /R 2 ij [1]. The surface S ij being proportional to R 2 ij in 3D and to R ij in 2D cases respectively, we end up with the following relations for the exponent γ [13]:…”

Section: Results Of 2d Simulation and The Effect Of The Cell Sizementioning

confidence: 99%

“…This force corresponds to an interaction between equivalent charges located at the extremity of the two interacting chains (see details in Refs. [1,8]). …”

Section: Analytical Model Of the Chain Growthmentioning

confidence: 99%

“…An overview of the physics of these systems as well as their practical applications can be found in Ref. [1].…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of internal structures growth in magnetic suspensions

Bossis

Lançon

Meunier

et al. 2013

Physica A: Statistical Mechanics and its Applications

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a b s t r a c tThe kinetics of aggregation of non Brownian magnetizable particles in the presence of a magnetic field is studied both theoretically and by means of computer simulations. A theoretical approach is based on a system of Smoluchowski equations for the distribution function of the number of particles in linear chain-like aggregates. Results obtained in the two dimensional (2D) and three dimensional (3D) models are analyzed in relation with the size of the cell, containing the particles, and the particle volume fraction ϕ. The theoretical model reproduces the change of the aggregation kinetics with the size of the cell and with the particle volume fraction as long as the lateral aggregation of chains is negligible.The simulations show that lateral aggregation takes place when, roughly, ϕ 2D > 5% and ϕ 3D > 1.5%.Dependence of the average size of the chains with time can be described by a power law; the corresponding exponent decreases with the particle volume fraction in relation with the lateral aggregation.In the 3D simulations, dense labyrinthine-like structures, aligned along the applied field, are observed when the particle concentration is high enough (ϕ 3D > 5%).

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Section: Results Of 2d Simulation and The Effect Of The Cell Sizesupporting

confidence: 55%

Section: Results Of 2d Simulation and The Effect Of The Cell Sizementioning

confidence: 99%

“…This force corresponds to an interaction between equivalent charges located at the extremity of the two interacting chains (see details in Refs. [1,8]). …”

Section: Analytical Model Of the Chain Growthmentioning

confidence: 99%

“…An overview of the physics of these systems as well as their practical applications can be found in Ref. [1].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetics of internal structures growth in magnetic suspensions

Bossis

Lançon

Meunier

et al. 2013

Physica A: Statistical Mechanics and its Applications

Self Cite

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“…Because thermal motion tends to destroy alignment of the moments, the average degree of the alignment depends on the ratio of the  0 mH to thermal energy k B T, i.e. the magnetic forces dominate the Brownian random forces (Bossis, Volkova, Lacis, & Meunier, 2002).  0 mH/k B T is defined as the Langevin parameter , which characterizes the system under an external magnetic field (Cerdà et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

The Effect of Gelation on the Apparent Magnetism of ZnFe2O4 Sol-Gel Systems

Lin¹,

Li²,

Liu³

et al. 2013

APR

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Experiments have shown that for thixotropic solgel systems consisting of ZnFe 2 O 4 nanoparticles without any matrix material, the measured magnetization, or susceptibility of gels, are greater than those of sols. For the reduced susceptibility, a system with a volume fraction of particles of  v =2.0% is lower than a system with  v =1.5%. These results have been interpreted in terms of a magnetization mechanism based on the Brownian rotation of the moments fixed inside the colloidal particles, which would be dramatically affected by the non-magnetic hydrodynamic interaction. For weakly cross-linked gels, the translational degree of freedom is "frozen" while the rotational degree of freedom remains unchanged, so that their hydrodynamic interaction effect is weaker, and they are more easily magnetized than the sols with both rotational and translational degrees of freedom. The action of gelation preventing the hydrodynamic interaction effect on the magnetization process can be referred to as the "gelation decoupling". Correspondingly, such behavior of the hydrodynamic interaction in affecting the apparent magnetism can be referred to as a "viscomagnetic effect".

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Characterization of Magnetorheological Fluid: A Study on Sedimentation and Redispersion

Prajapati

Lakdawala

2022

Adv Eng Mater

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Herein, an induction method based setup for quantification of sedimentation behavior of magnetorheological fluids (MR fluids) consisting of 10% carbonyl iron powder in silicone oil is used. The effect of addition of Aerosil (stabilizer) on sedimentation is proposed with the help of “sedimentation index.” The proposed model of sedimentation index is compared with experimental measurement and is found to be in good agreement. In case of unavoidable event of settling, the important point is the ease of redispersion of sediment. This is directly evaluated with the help of a slider crank mechanism based setup which is proposed on the basis of the actual application. The quantification of redispersibility of the settled MR fluid is proposed using novel “redispersion index.” It is observed that increasing the concentration of Aerosil reduces the settling due to high off‐state viscosity, however, at the cost of redispersibility. In this study, the optimum trade‐off between the redispersibility and slow settling is obtained with 15% concentration of Aerosil in the MR fluid.

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Magnetorheology: Fluids, Structures and Rheology

Cited by 215 publications

References 84 publications

Kinetics of internal structures growth in magnetic suspensions

Kinetics of internal structures growth in magnetic suspensions

The Effect of Gelation on the Apparent Magnetism of ZnFe2O4 Sol-Gel Systems

Characterization of Magnetorheological Fluid: A Study on Sedimentation and Redispersion

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