Rheological and magnetic properties of a metal particle dispersion exposed to magnetic fields

Piao, Meihua; Lane, Alan M.; Johnson, Dylan

doi:10.1016/s0304-8853(03)00405-0

Cited by 11 publications

(6 citation statements)

References 10 publications

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“…Magnetic fields can be used to tailor the properties of a magnetic suspension over a wide range of amplitudes and directions. The formation of anisotropic magnetic aggregates leads to modification of the rheological, 1,2 optical, 3 and magnetic properties 4,5 of the suspension. An interesting investigation was published recently, 6 which describes rheological measurements on magnetic field induced chain formation of magnetic nanoparticles and discusses the effects of particles sizes and magnetic properties, magnetic field amplitude, and interactions with the walls of a viscometer.…”

Section: Introductionmentioning

confidence: 99%

Aggregation of magnetic microparticles in the context of targeted therapies actuated by a magnetic resonance imaging system

Mathieu

2009

Journal of Applied Physics

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A study of magnetic aggregation in the context of magnetic resonance imaging ͑MRI͒ based actuated targeting is proposed. MRI systems can induce displacement forces on magnetized particles as they flow through the blood vessels. Magnetic aggregation of the particles happens when they are placed within the magnetic field of the MRI system and can greatly influence the MRI steering dynamics of magnetic particles. In this paper, a review of the different parameters that can be used to tailor the size, geometry, stiffness, and density of magnetic aggregates is proposed. Then, magnetic aggregation experiments on a suspension of Fe 3 O 4 microparticles ranging from 0.1 to 100 m in diameter are described. The effects of particle concentration, flow rate, and magnetic field amplitude were evaluated. Field amplitudes of 1.5 mT, 0.4 T, and 1.5 T fields were applied without any magnetic steering gradients and caused aggregates that could sometimes exceed 1 mm in length. Since magnetic aggregates can reach higher magnetophoretic velocities than individual particles, large aggregates could be exploited in larger arteries with important blood flows. A few strategies are discussed to assist in the design of MRI steering experiments by enhancing the positive effects of magnetic aggregation over its negative effects.

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Section: Introductionmentioning

confidence: 99%

Aggregation of magnetic microparticles in the context of targeted therapies actuated by a magnetic resonance imaging system

Mathieu

2009

Journal of Applied Physics

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“…To reduce the computational complexity, the moments of MPs are fixed along the field direction in our simulations. Taking into account that magnetic moments do not align with the applied field, as magnetic interaction increases, some complex structures such as columnar, lamellar and striped structures [16,17], should be formed. For a relatively weak interaction, the motion of particles is controlled mainly by magnetic field gradient.…”

Section: Effects Of the Interaction Between Mps On Distributions Of Pmentioning

confidence: 99%

“…Chain-like structure has been found in low magnetic fields [15,16], while columnar, lamellar and striped structures in high fields [17,18], ellipsoidal structures in pulsed fields [19] and layered structures in rotating magnetic fields [20]. However, understanding of the distributions of MPs under gradient magnetic fields is still weak.…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional Monte Carlo simulations of a suspension comprised of magnetic and nonmagnetic particles in gradient magnetic fields

Peng

Min

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…The magneto-rheological effect is strongly dependent on a variety of factors such as particle shape, magnetic particle-particle and particle-field interactions (Satoh, 2001;Satoh, 2003a;Paulus et al, 2001;de Vicente et al, 2009;de Vicente et al, 2010;Piao et al, 2003;Choi et al, 2000;Bell et al, 2007). A suspension composed of hematite particles exhibit characteristic magneto-rheological properties completely different form those of ordinary ferromagnetic particles (Ozaki et al, 1988;Ozaki and Matijević, 1985;Varanda et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Control of the orientational characteristics of disk-like hematite particles by a simple shear flow

Satoh

2016

Mechanical Engineering Letters

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We discuss the behavior of oblate spheroidal hematite particles in a simple shear flow. Magneto-rheological properties are strongly dependent on the magnetic field direction. For instance, a rod-like hematite particle suspension exhibits negative viscosity characteristics in a certain direction of an applied magnetic field. From this background, we here consider the case of an external magnetic field applied in the direction of the angular velocity vector of a simple shear flow. If the magnetic field is much more dominant than the thermal motion, the particle can almost freely rotate about the direction of the angular velocity vector. This characteristic rotational motion is suppressed or controlled by the shear flow more significantly with increasing shear rate.

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Rheological and magnetic properties of a metal particle dispersion exposed to magnetic fields

Cited by 11 publications

References 10 publications

Aggregation of magnetic microparticles in the context of targeted therapies actuated by a magnetic resonance imaging system

Aggregation of magnetic microparticles in the context of targeted therapies actuated by a magnetic resonance imaging system

Two-dimensional Monte Carlo simulations of a suspension comprised of magnetic and nonmagnetic particles in gradient magnetic fields

Control of the orientational characteristics of disk-like hematite particles by a simple shear flow

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