Dynamic rheological properties of viscoelastic magnetic fluids in uniform magnetic fields

Yamaguchi, Hiroshi; Niu, Xiaodong; Ye, Xiao-Jiang; Li, Mingjun; Iwamoto, Yuhiro

doi:10.1016/j.jmmm.2012.04.006

Cited by 32 publications

(12 citation statements)

References 11 publications

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“…The applications of magnetic particles have been extended to solid-dispersed substances of magnetorheological (MR) fluids, in which the MR fluids are dispersions of magnetic particles in non-magnetic medium fluids. These fluids exhibit a reversible phase change between a liquid-like and solid-like state with an external magnetic field. − Therefore, they have been applied in engineering areas, such as engine mounts, clutches, brakes, valves, and shock absorbers in the automobile industry, on account of their controllable, reversible, and improved mechanical properties and polishing characteristics. − …”

Section: Introductionmentioning

confidence: 99%

Pickering-Emulsion-Polymerized Polystyrene/Fe₂O₃ Composite Particles and Their Magnetoresponsive Characteristics

et al. 2013

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Core-shell-structured magnetic polystyrene (PS)/inorganic particles were fabricated by Pickering emulsion polymerization using nanosized Fe2O3 particles as a solid stabilizer. Scanning electron microscopy and transmission electron microscopy confirmed the synthesized PS/Fe2O3 particles to be comprised of a PS surface coated with Fe2O3 nanoparticles. The chemical structure of the composite nanospheres was characterized by Fourier transform infrared spectroscopy and X-ray diffraction. The thermal properties of composite nanospheres and corresponding pure polymer were examined by thermogravimetric analysis. The rheological properties of the core-shell-structured magnetic PS/inorganic particles dispersed in silicone oil were investigated under an external magnetic field strength using a rotational rheometer. The particles with extremely lower density than common magnetic particles exhibited solid-like magnetorheological phase characteristics, and the flow curves were fitted to the Cho-Choi-Jhon model of the rheological equation of state.

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Section: Introductionmentioning

confidence: 99%

Pickering-Emulsion-Polymerized Polystyrene/Fe₂O₃ Composite Particles and Their Magnetoresponsive Characteristics

et al. 2013

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“…For application in brakes, MR fluids need to have controllable but high on-state shear stress (Carlson, 2002) and low off-state viscosity (Olabi and Grunwald, 2007). Besides these requirements, one very important requirement is the stability of the MR fluid, which is often neglected under the assumption that the stirring effect created by the rotating disc is sufficient to redisperse the MR particles (Yamaguchi et al, 2012). However, experimental results of the present study indicated a reduction in MR torque with passage of time.…”

Section: Introductionmentioning

confidence: 66%

Synthesis and field dependent shear stress evaluation of stable MR fluid for brake application

Lijesh

Kumar

Hirani

2017

ILT

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Purpose The purpose of this paper is to report on the development of magnetorheological (MR) fluids, having high on-state shear stress/viscosity, low off-state shear stress/viscosity, good redispersibility and stable suspension of carbonyl iron particles, using tetramethyl ammonium hydroxide (TAH) and oleic acid. Design/methodology/approach MR fluids for use in brakes are synthesized using different weight percentages of silicone oil, TAH, oleic acid and iron particles. The effects of TAH and oleic acid are studied. Shear stress is measured as a function of magnetic field on a magneto-rheometer. The images of MR particles settling with time are presented. The test set-up used to evaluate the performance of the MR fluids synthesized for brake application is detailed. Finally, a significant improvement in the MR performance of brakes is reported. Findings The MR fluid having 0.25 Wt.% oleic acid showed low off-state viscosity/shear stress and high on-state viscosity/shear stress. A higher weight percentage of TAH in the MR fluid further reduced the low off-shear stress and increased the high on-state shear stress with better stability. Originality/value Improvement of MR brake performance by adding surfactants like TAH and oleic acid has been the subject matter of several studies in the past, but these studies used a fixed percentage of surfactants in MR fluids. In the present work, the optimum percentage of TAH and oleic acid for an improved braking performance is determined by varying their content in the MR fluid, which has not been reported in any other work thus far.

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“…Our results for viscoelastic moduli imply that G (ω) > G (ω) up to a crossover ω * for quiescent ferrofluid. Meanwhile for magnetorheological fluids under external magnetic field it is known through experiments that typically these moduli show a reverse relationship regarding frequency G (ω) > G (ω) [20,24]. Figure 4 depicts the effect on the viscoelastic moduli of Eqs.…”

Section: Viscoelastic Modulimentioning

confidence: 99%

“…Such a heating mechanism is relevant in hyperthermia applications where ferro-particles diffuse, rotate and stick to the boundaries in the multicomponent medium inside of a tissue [21]. These findings have raised the interest to investigate the rheology of complex fluids of mixtures of added polymer solutions to the magnetorheological fluid [20,[22][23][24]. Thus, the theoretical description of their observed rheology and effect of size polydispersity [25][26][27][28], have been described with polymers motivated models [29,30].…”

Section: Introductionmentioning

confidence: 99%

Diffusion microrheology of ferrofluids

Peredo-Ortíz

Hernández-Contreras

2018

Rev. Mex. Fís.

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We provide a statistical mechanics approach to study the linear microrheology of thermally equilibrated and homogeneous ferrofluids. Theexpressions for the elastic and loss moduli depend on the bulk microstructure of the magnetic fluid determined by the structure factor of thesuspension of magnetic particles. The comparison of the predicted microrheology with computer simulations confirms that as a function ofrelaxation frequency of thermal fluctuations of the particle concentration both theory and simulations have the same trends. At very shortfrequencies the viscous modulus relates to the translational and rotational self-diffusion coefficients of a ferro-particle.

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Dynamic rheological properties of viscoelastic magnetic fluids in uniform magnetic fields

Cited by 32 publications

References 11 publications

Pickering-Emulsion-Polymerized Polystyrene/Fe₂O₃ Composite Particles and Their Magnetoresponsive Characteristics

Pickering-Emulsion-Polymerized Polystyrene/Fe₂O₃ Composite Particles and Their Magnetoresponsive Characteristics

Synthesis and field dependent shear stress evaluation of stable MR fluid for brake application

Diffusion microrheology of ferrofluids

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Dynamic rheological properties of viscoelastic magnetic fluids in uniform magnetic fields

Cited by 32 publications

References 11 publications

Pickering-Emulsion-Polymerized Polystyrene/Fe2O3 Composite Particles and Their Magnetoresponsive Characteristics

Pickering-Emulsion-Polymerized Polystyrene/Fe2O3 Composite Particles and Their Magnetoresponsive Characteristics

Synthesis and field dependent shear stress evaluation of stable MR fluid for brake application

Diffusion microrheology of ferrofluids

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Product

Resources

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Pickering-Emulsion-Polymerized Polystyrene/Fe₂O₃ Composite Particles and Their Magnetoresponsive Characteristics

Pickering-Emulsion-Polymerized Polystyrene/Fe₂O₃ Composite Particles and Their Magnetoresponsive Characteristics