High magnetization FeCo nanoparticles for magnetorheological fluids with enhanced response

Soft Matter ◽  
2021 ◽  
Author(s):  
Virginia Vadillo ◽  
Ainara Gómez ◽  
Joanes Berasategi ◽  
Jon Gutiérrez ◽  
Maite Insausti ◽  
...  
Keyword(s):  
Yield Stress ◽  
Magnetorheological Fluid ◽  
Magnetorheological Fluids ◽  
Feco Nanoparticles

A magnetorheological fluid with good properties (yield stress and reversibility), containing high magnetization FeCo nanoparticles as magnetic fillers is presented.

scholarly journals Aspects Concerning the Fabrication of Magnetorheological Fluids Containing High Magnetization FeCo Nanoparticles

Fluids ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 132
Author(s):  
Jon Gutiérrez ◽  
Virginia Vadillo ◽  
Ainara Gómez ◽  
Joanes Berasategi ◽  
Maite Insausti ◽  
...  
Keyword(s):  
Recent Literature ◽  
Chemical Reduction ◽  
Collaborative Work ◽  
Magnetorheological Fluid ◽  
Dipolar Interaction ◽  
Fabrication Process ◽  
Superior Performance ◽  
Strong Trend ◽  
Magnetic Dipolar Interaction ◽  
Feco Nanoparticles

Recently, our collaborative work in the fabrication of a magnetorheological fluid (MRF) containing high magnetization FeCo nanoparticles (NPs, fabricated in our laboratories using the chemical reduction technique; MS = 212 Am2/kg) as magnetic fillers have resulted in a new MRF with superior performance up to 616.7 kA/m. The MRF had a yield stress value of 2729 Pa and good reversibility after a demagnetization process. This value competes with the best ones reported in the most recent literature. Nevertheless, the fabrication process of this type of fluid is not an easy task since there is a strong trend to the aggregation of the FeCo NPs due to the strong magnetic dipolar interaction among them. Thus, now we present the analysis of some aspects concerning the fabrication process of our FeCo NPs containing MRF, mainly the type of surfactant used to cover those NPs (oleic acid or aluminium stearate) and its concentration, and the procedure followed (mechanical and/or ultrasound stirring) to achieve a good dispersion of those magnetic fillers within the fluid.

Magnetic field dependent steady-state shear response of Fe3O4 micro-octahedron based magnetorheological fluids

2018 ◽  
Vol 20 (30) ◽  
pp. 20247-20256 ◽  
Author(s):  
A. V. Anupama ◽  
V. B. Khopkar ◽  
V. Kumaran ◽  
B. Sahoo
Keyword(s):  
Magnetic Field ◽  
Steady State ◽  
Yield Stress ◽  
Applied Magnetic Field ◽  
Rheological Behaviour ◽  
Magnetorheological Fluids ◽  
Shear Response ◽  
Field Dependent ◽  
Dynamic Yield ◽  
Magneto Rheological

The magneto-rheological behaviour of fluids containing soft-ferrimagnetic Fe3O4 micro-octahedrons (M = magnetization, τY = dynamic yield-stress and H = applied-magnetic-field).

Metrological characteristics of the frequency method for measuring the viscosity of magnetorheological fluids in a rotary viscometer

2020 ◽  
pp. 28-33
Author(s):  
E.S. Belyaev ◽  
A.V. Vanyagin ◽  
B.A. Gordeev ◽  
V.I. Erofeev ◽  
S.N. Okhulkov
Keyword(s):  
Dynamic Viscosity ◽  
Torsion Angle ◽  
Viscoelastic Medium ◽  
Twist Angle ◽  
Magnetorheological Fluid ◽  
Magnetorheological Fluids ◽  
Metrological Characteristics ◽  
Beat Signal ◽  
Frequency Method ◽  
Rotary Viscometer

A frequency method for measuring the dynamic viscosity of rheological media is described using the example of a magnetorheological fluid. The method is based on the principle of operation of a rotary viscometer, in which the torsion angle depends on the characteristics of the viscoelastic medium. Keywords frequency method, dynamic viscosity, torque, beat signal, methodical error, resolution, accuracy, twist angle, torsion. [email protected]; [email protected]

A new platform for the prediction of field-dependent yield stress and plastic viscosity of magnetorheological fluids using particle swarm optimization

2019 ◽  
Vol 76 ◽  
pp. 615-628 ◽  
Author(s):  
Irfan Bahiuddin ◽  
Saiful Amri Mazlan ◽  
Mohd. Ibrahim Shapiai ◽  
Fitrian Imaduddin ◽  
Ubaidillah ◽  
...  
Keyword(s):  
Particle Swarm Optimization ◽  
Yield Stress ◽  
Particle Swarm ◽  
Magnetorheological Fluids ◽  
Plastic Viscosity ◽  
Swarm Optimization ◽  
Field Dependent

Development of a double magnetic circuit yield stress measurement device for magnetorheological fluid

2016 ◽  
Vol 28 (10) ◽  
pp. 1249-1259 ◽  
Author(s):  
Xiang-Fan Wu ◽  
Xing-Ming Xiao ◽  
Zu-Zhi Tian ◽  
Fei Chen ◽  
Jian Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Yield Stress ◽  
Magnetic Circuit ◽  
Stress Measurement ◽  
Magnetorheological Fluid ◽  
High Yield ◽  
Magnetic Field Measurement ◽  
Measurement Device ◽  
Accuracy And Repeatability ◽  
The Magnetic Field

On the basis of shear working mode of magnetorheological fluid, in this article, a novel temperature controllable yield stress measurement device is designed, and the double magnetic circuit structure and the heating structure are proposed. And then, the magnetic field and temperature field of the measurement device are simulated, respectively, by the finite element method. Furthermore, several experiments are carried out to evaluate the magnetic field, measurement precision, and repeatability of the self-designed device. The results indicate that the proposed measurement device has uniform magnetic field distribution and controllable temperature and also has high yield stress testing accuracy and repeatability.

Magnetorheological properties and polishing characteristics of silica-coated carbonyl iron magnetorheological fluid

2017 ◽  
Vol 29 (1) ◽  
pp. 137-146 ◽  
Author(s):  
Kwang Pyo Hong ◽  
Ki Hyeok Song ◽  
Myeong Woo Cho ◽  
Seung Hyuk Kwon ◽  
Hyoung Jin Choi
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Field Intensity ◽  
Carbonyl Iron ◽  
Material Removal ◽  
Magnetic Field Intensity ◽  
Magnetorheological Fluid ◽  
Wheel Speed ◽  
Magnetorheological Fluids ◽  
Experimental Conditions

While magnetorheological fluids can be used for ultra-precise polishing, for example, of advanced optical components, oxidation of metallic particles in water-based magnetorheological fluids causes irregular polishing behavior. In this study, carbonyl iron microspheres were initially coated with silica to prevent oxidation and were used to polish BK7 glass. In addition, their rheological and sedimentation characterizations were investigated. Material removal and surface roughness were analyzed to investigate the surface quality and optimal experimental conditions of polishing wheel speed and magnetic field intensity. The maximum material removal was 0.95 µm at 95.52 kA/m magnetic field intensity and 1854 mm/s wheel speed. A very fine surface roughness of 0.87 nm was achieved using the silica-coated magnetorheological fluid at 47.76 kA/m magnetic field intensity and 1854 mm/s wheel speed.

The strengthening effect of guar gum on the yield stress of magnetorheological fluid

2006 ◽  
Vol 15 (4) ◽  
pp. N94-N98 ◽  
Author(s):  
Wei Ping Wu ◽  
Bin Yuan Zhao ◽  
Qing Wu ◽  
Le Sheng Chen ◽  
Ke Ao Hu
Keyword(s):  
Yield Stress ◽  
Guar Gum ◽  
Magnetorheological Fluid ◽  
Strengthening Effect
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