Study of Magnetoviscosity of Ferromagnetic MnZn-Ferrite Ferrofluid

Thirupathi, G.; Singh, Ramesh

doi:10.1109/tmag.2015.2437849

Cited by 14 publications

(9 citation statements)

References 29 publications

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“…It has been theorized that attachment and detachment of the sidechains from dense clusters of particles is responsible for the dynamic viscoelastic behaviors of MRFs [6]. Some studies have shown that the dipole interactions among MNPs are primarily responsible for the difference in aggregation behavior [7,8], which in turn governs rheological features. Measurement techniques like neutron scattering [9,10] and X-ray scattering [11,12] have been employed by researchers to reveal information regarding the field induced microstructures of the MRFs.…”

Section: Introductionmentioning

confidence: 99%

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Chattopadhyay

Samanta

Srivastava

et al. 2019

Journal of Magnetism and Magnetic Materials

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The present article reports the governing influence of substituting the M 2+ site in nanoscale MFe 2 O 4 spinel ferrites by different magnetic metals (Fe/Mn/Co/Ni) on magnetorheological and magneto-elastoviscous behaviors of the corresponding magnetorheological fluids (MRFs). Different doped MFe 2 O 4 nanoparticles have been synthesized using the polyol-assisted hydrothermal method. Detailed steady and oscillatory shear rheology have been performed on the MRFs to determine the magneto-viscoelastic responses The MRFs exhibit shear thinning behavior and augmented yield characteristics under influence of magnetic field. The steady state magnetoviscous behaviors are scaled against the governing Mason number and self-similar response from all the MRFs have been noted. The MRFs conform to an extended Bingham plastic model under field effect. Transient magnetoviscous responses show distinct hysteresis behaviors when the MRFs are exposed to time varying magnetic fields. Oscillatory shear studies using frequency and strain amplitude sweeps exhibit predominant solid like behaviors under field environment. However, the relaxation behaviors and strain amplitude sweep tests of the MRFs reveal that while the fluids show solid-like behaviors under field effect, they cannot be termed as typical elastic fluids. Comparisons show that the MnFe 2 O 4 MRFs have superior yield performance among all. However, in case of dynamic and oscillatory systems, CoFe 2 O 4 MRFs show the best performance. The viscoelastic responses of the MRFs are noted to correspond to a three element viscoelastic model. The study may find importance in design and development strategies of nano-MRFs for different applications. The supplementary material document contains additional information, data, tables and plots of the complex fluid characterization, rheological behavior and additional data on the magnetoelastoviscous response of the fluids.

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Section: Introductionmentioning

confidence: 99%

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Chattopadhyay

Samanta

Srivastava

et al. 2019

Journal of Magnetism and Magnetic Materials

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“…e surfactant is coated on the surface of magnetic nanoparticles to prevent the mutual attraction of solid nanoparticles from causing aggregation, and due to Brownian motion, magnetic nanoparticles are uniformly dispersed in carrier liquid [1,2]. Magnetic fluid has unique magnetic and hydrodynamic properties [3,4]. Under the effect of magnetic field, magnetic fluid is magnetized and the magnetic torque of magnetic nanoparticles increases to resist the viscous torque, which leads to the increase of friction force between the magnetic nanoparticles and the carrier liquid [5,6], showing the increase of the apparent viscosity of the magnetic fluid, which is called magnetoviscous characteristic [7,8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis and Experimental Research on Damping Performance of a Novel Magnetic Fluid Damper

Yang

Wei

et al. 2021

Advances in Materials Science and Engineering

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Considering the low-frequency and large-amplitude vibration characteristics of the high-rise structure, a tuned magnetic fluid rolling-ball damper is proposed to suppress the vibration of the structure. By adjusting the external magnetic field to control the natural rolling frequency of the ball, the purpose of tuning vibration reduction is achieved. Firstly, the working principle of the damper is theoretically analysed, a three-dimensional (3D) magnetic-fluid-solid multiphysical field coupling mathematical model of the damper is established and the governing equations of multiphysical field coupling are derived. Secondly, the magnetic field distribution and operating characteristics of the damper are simulated and analysed. Finally, the effectiveness of the model is verified by experiments, and the damping performance of the damper with two kinds of magnetic fluid is tested and compared. The results show that the magnetic-fluid-solid multiphysical field coupling model can accurately simulate the working characteristics of the damper. The maximum damping force of the damper is about 12% of the elastic force of the structure, which can increase the damping ratio of the structure by about two times, effectively reduce the vibration response time, and suppress the vibration of the high-rise structure.

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“…Various studies have been conducted on special materials including nanoparticles [1][2][3][4][5][6][7][8]. Ferrofluid is a magnetic liquid and refers to water or oil mixed with ultra-fine powder [9][10][11][12][13][14][15][16]. A photo of ferrofluid observed by transmission electron microscopy (TEM) is shown in Figure 1 [12].…”

Section: Introductionmentioning

confidence: 99%

Improvement in Torque Density by Ferrofluid Injection into Magnet Tolerance of Interior Permanent Magnet Synchronous Motor

et al. 2021

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In an interior permanent magnet synchronous motor, an adhesive such as bond is generally injected into the magnet tolerance to prevent vibration of the permanent magnet within the insertion space. In this case, a disadvantage is that the magnet tolerance does not contribute to the performance. In this paper, ferrofluid is inserted to improve the torque density, utilizing the magnet tolerance. When inserting ferrofluid into the magnet tolerance, it is important to fix the magnet because conventional adhesives are not used, and it is important that the ferrofluid does not act as a leakage path within the insertion space. In this study, a new rotor configuration using a plastic barrier that satisfies these considerations was introduced. The analysis was conducted through finite element analysis (FEA), and this technique was verified by comparing the simulation results and the experimental results through a dynamo test. It was confirmed that the no-load back electromotive force in the final model increased through ferrofluid injection.

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Study of Magnetoviscosity of Ferromagnetic MnZn-Ferrite Ferrofluid

Cited by 14 publications

References 29 publications

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Numerical Simulation Analysis and Experimental Research on Damping Performance of a Novel Magnetic Fluid Damper

Improvement in Torque Density by Ferrofluid Injection into Magnet Tolerance of Interior Permanent Magnet Synchronous Motor

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Study of Magnetoviscosity of Ferromagnetic MnZn-Ferrite Ferrofluid

Cited by 14 publications

References 29 publications

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Numerical Simulation Analysis and Experimental Research on Damping Performance of a Novel Magnetic Fluid Damper

Improvement in Torque Density by Ferrofluid Injection into Magnet Tolerance of Interior Permanent Magnet Synchronous Motor

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Product

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Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids

Elemental substitution tuned magneto-elastoviscous behavior of nanoscale ferrite MFe2O4 (M = Mn, Fe, Co, Ni) based complex fluids