Physical characteristics of magnetorheological suspensions and their applications

Bîcă, Ioan; Liu, Ying Dan; Choi, Hyoung Jin

doi:10.1016/j.jiec.2012.10.008

Cited by 171 publications

(76 citation statements)

References 151 publications

(205 reference statements)

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“…The reversible phase transitions as a response to external stimuli, such as pH, temperature, ionic strength, shear, electric or magnetic fields become a significant area of materials research [1][2][3][4][5][6][7][8]. Electric or magnetic stimuli-responsive suspension systems are particularly noticeable because their dramatic changes in shear viscosity and yield stress under a range of conditions is useful for rheology control applications.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of polyaniline coated iron oxide hybrid particles and their dual stimuli-response under electric and magnetic fields

Sim¹,

Chae²,

Choi³

2015

Express Polym. Lett.

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Abstract. Polyaniline (PANI)-coated iron oxide (Fe 3 O 4 ) sphere particles were fabricated and applied to a dual stimuliresponsive material under electric and magnetic fields, respectively. Sphere Fe 3 O 4 particles were synthesized by a solvothermal process and protonated after acidification. The aniline monomer tended to surround the surface of the Fe 3 O 4 core due to the electrostatic and hydrogen bond interactions. A core-shell structured product was finally formed by the oxidation polymerization of PANI on the surface of Fe 3 O 4 . The formation of Fe 3 O 4 @PANI particles was examined by scanning electron microscope and transmission electron microscope. The bond between Fe 3 O 4 and PANI was confirmed by Fourier transform-infrared spectroscope and magnetic properties were analyzed by vibration sample magnetometer. A hybrid of a conducting and magnetic particle-based suspension displayed dual stimuli-response under electric and magnetic fields. The suspension exhibited typical electrorheological and magnetorheological behaviors of the shear stress, shear viscosity and dynamic yield stress, as determined using a rotational rheometer. Sedimentation stability was also compared between Fe 3 O 4 and Fe 3 O 4 @PANI suspension.

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Section: Introductionmentioning

confidence: 99%

Fabrication of polyaniline coated iron oxide hybrid particles and their dual stimuli-response under electric and magnetic fields

Sim¹,

Chae²,

Choi³

2015

Express Polym. Lett.

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“…Jang et al 2009 have proposed in their study a new model to predict the behavior of MR fluid under arbitrary 3D magnetic and shear strain fields using Lekner summation method. Viscosity testing of MR fluid for different magnetic fields was studied by Roszkowski et al 2008. Bica et al 2013 have reviewed the potential applications of magnetorheological suspensions with their rheological and electro-conductive properties under an applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Laminar Pipe Flow of Magneto-Rheological Fluids under Applied External Magnetic Field

Gedik

2017

JAFM

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An experimental and numerical study of Magnetorheological (MR) fluids flow in circular pipes under the influence of uniform magnetic field is considered. In the experiments, an electromagnetic device was manufactured to generate the magnetic field. The experiments were performed using magnetic fields B= 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.12 and 0.15 T. Numerical study was performed to show the accuracy of the results obtained from experimental study. In numerical study, Computational Fluid Dynamics (CFD) analysis was used. The ANSYS Fluent 14.0 code based on the finite volume method was used for the CFD analysis. In the experiments, the applied magnetic field decreased the flow rate of the fluids by increasing viscosity. In case of 10 mm pipe diameter, the flow velocity of the A, B and C fluids were obtained as 0.593, 0.749 and 0.938 m/s respectively in situation B=0 T. When magnetic field was applied as B=0.15 T, decreases have occurred in the velocity of A, B and C fluids as 95.27%, 90.24% and 85.6% respectively. Similarly, in case of 15 mm pipe diameter, 96.87%, 95.06% and 90.76% decreases have occurred in the flow velocity of A, B and C fluids having 0.301, 0.363 and 0.445 m/s flow velocity respectively. The results were compared for the magnetic field values B=0, 0.05, 0.10 and 0.15 T. It was found that the differences between experimental and numerical study were found as 6.10% and 1.71% for the B=0 T and B≠0 T situations respectively when the pipe has 10 mm pipe diameter. In case of 15 mm pipe diameter, the differences were found as 2.31% and 0.89%. As a result, it was found that the results obtained from experimental and numerical study were qualitatively and quantitatively in good agreement.

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“…Silicone rubber (SR), carbonyl iron (CI), silicone oil (SO) and graphene nanoparticles (nGr) are components of magnetorheological suspensions (MRSs) [1][2][3][4] and of magnetorheological elastomers (MREs) [5][6][7][8], which fall in the broad category of magnetic active materials (MAMs). It is known that MAMs modify their physical properties when a magnetic field is applied [1][2][3][4][5][6][7][8], which makes them suitable materials for the manufacture of: vibration and seismic shock dampers [9][10][11][12]; sensors and transducers for deformations and mechanical tensions [13][14][15]; magnetic field sensors [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…It is known that MAMs modify their physical properties when a magnetic field is applied [1][2][3][4][5][6][7][8], which makes them suitable materials for the manufacture of: vibration and seismic shock dampers [9][10][11][12]; sensors and transducers for deformations and mechanical tensions [13][14][15]; magnetic field sensors [16,17]. Following the increasing interest for obtaining new MAMs, hybrid materials have been produced in the form of hybrid magnetorheological suspensions (hMRSs) [19] and hybrid magnetorheological elastomers (hMREs) [20,21].…”

Section: Introductionmentioning

confidence: 99%

Magnetodielectric membranes: Effects of the magnetic field on the dielectric loss tangent

Bǎlǎșoiu

Bunoiu

Chirigiu

et al. 2017

AIP Conference Proceedings

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Abstract. Magnetodielectric membranes are a category of smart materials whose properties are drastically modified in magnetic fields. Such membranes with various compositions were produced and placed between the armatures of flat capacitors. In a magnetic field of adjustable intensity H from 0 to 250 kA/m, in increments of 50 kA/m, the dielectric loss tangent of the flat capacitors is measured in an electromagnetic field having frequencies between 1 kHz and 100 kHz, in increments of 5 kHz. The obtained data is used to plot the absorption characteristics of the membranes, which are sensibly influenced by the volume fraction of graphene nanoparticles and intensity H of the transversal magnetic field. The obtained results are presented and discussed.

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Physical characteristics of magnetorheological suspensions and their applications

Cited by 171 publications

References 151 publications

Fabrication of polyaniline coated iron oxide hybrid particles and their dual stimuli-response under electric and magnetic fields

Fabrication of polyaniline coated iron oxide hybrid particles and their dual stimuli-response under electric and magnetic fields

Experimental and Numerical Investigation on Laminar Pipe Flow of Magneto-Rheological Fluids under Applied External Magnetic Field

Magnetodielectric membranes: Effects of the magnetic field on the dielectric loss tangent

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