Numerical simulation of chainlike cluster movement of feeble magnetic particles by induced magnetic dipole moment under high magnetic fields

Ando, Tsutomu; Hirota, Noriyuki; Wada, Hitoshi

doi:10.1088/1468-6996/10/1/014609

Cited by 17 publications

(7 citation statements)

References 17 publications

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“…For the nanocomposite sample, the effect of the NPs-rich regions protruding out of the matrix ( figure 5b ) is probably following from a different surface relaxation after ultramicrotome cut, due to compositional non–uniformity in the solid film. The contrast observed in figure 5 is in agreement with the existing literature 19 20 21 . In particular, in the force gradient image of figure 5c a fine grained structure of the single magnetic NPs is detected throughout the magnetic stripes, which is not visible in the energy loss image of figure 5d .…”

Section: Discussionsupporting

confidence: 92%

“…The contrast observed in figure 5 is in agreement with the existing literature192021. In particular, in the force gradient image of figure 5c a fine grained structure of the single magnetic NPs is detected throughout the magnetic stripes, which is not visible in the energy loss image of figure 5d.…”

Section: Discussionsupporting

confidence: 90%

“…The SP state is of interest since the non-magnetic particles can still be magnetized by an external field, which will favor one of the two opposite easy magnetization directions, leading to a stable magnetic configuration as described by the Stoner-Wohlfarth model 18 19 . In this way, field controlled SP NP assemblies can be induced in a colloidal dispersion 13 20 21 . Additionally, shape, size and magnetic properties of the assemblies can be tuned by controlling particle size and magnetic field 5 22 23 24 .…”

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confidence: 99%

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“Magnetic Force Microscopy and Energy Loss Imaging of Superparamagnetic Iron Oxide Nanoparticles”

Torre

Bertoni

Fragouli

et al. 2011

Sci Rep

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We present quantitative, high spatially resolved magnetic force microscopy imaging of samples based on 11 nm diameter superparamagnetic iron oxide nanoparticles in air at room temperature. By a proper combination of the cantilever resonance frequency shift, oscillation amplitude and phase lag we obtain the tip-sample interaction maps in terms of force gradient and energy dissipation. These physical quantities are evaluated in the frame of a tip-particle magnetic interaction model also including the tip oscillation amplitude. Magnetic nanoparticles are characterized both in bare form, after deposition on a flat substrate, and as magnetically assembled fillers in a polymer matrix, in the form of nanowires. The latter approach makes it possible to reveal the magnetic texture in a composite sample independently of the surface topography.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 90%

mentioning

confidence: 99%

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“Magnetic Force Microscopy and Energy Loss Imaging of Superparamagnetic Iron Oxide Nanoparticles”

Torre

Bertoni

Fragouli

et al. 2011

Sci Rep

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“…The force acting between the dipoles may be attractive or repulsive, depending on their mutual location and orientation (Figure 9), resulting in aggregates. The force that is attributable to the diamagnetic dipole moments is extremely small and researchers report only a few examples [98][99][100][101].…”

Section: Magnetic Dipole-dipole Interactionmentioning

confidence: 99%

Magnetic Processing of Diamagnetic Materials

Yamato

Kimura

2020

Polymers

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Currently, materials scientists and nuclear magnetic resonance spectroscopists have easy access to high magnetic fields of approximately 10 T supplied by superconducting magnets. Neodymium magnets that generate magnetic fields of approximately 1 T are readily available for laboratory use and are widely used in daily life applications, such as mobile phones and electric vehicles. Such common access to magnetic fields—unexpected 30 years ago—has helped researchers discover new magnetic phenomena and use such phenomena to process diamagnetic materials. Although diamagnetism is well known, it is only during the last 30 years that researchers have applied magnetic processing to various classes of diamagnetic materials such as ceramics, biomaterials, and polymers. The magnetic effects that we report herein are largely attributable to the magnetic force, magnetic torque, and magnetic enthalpy that in turn, directly derive from the well-defined magnetic energy. An example of a more complex magnetic effect is orientation of crystalline polymers under an applied magnetic field; researchers do not yet fully understand the crystallization mechanism. Our review largely focuses on polymeric materials. Research topics such as magnetic effect on chiral recognition are interesting yet beyond our scope.

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“…manganese(II) chloride). [38][39][40][41][42] While the examples above required expensive and often not easily accessible superconducting magnets to generate high magnetic fields, in recent years diamagnetic repulsion has been applied on a smaller scale using conventional permanent magnets and electromagnets. Kimura et al 43,44 demonstrated the micropatterning of cells and particles suspended in aqueous paramagnetic solutions into periodic lines.…”

Section: Introductionmentioning

confidence: 99%

Flow focussing of particles and cells based on their intrinsic properties using a simple diamagnetic repulsion setup

Rodriguez-Villarreal¹,

Tarn²,

Madden³

et al. 2011

Lab Chip

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The continuous flow focussing and manipulation of particles and cells are important factors in microfluidic applications for performing accurate and reproducible procedures downstream. Many particle focussing methods require complex setups or channel designs that can limit the process and its applications. Here, we present diamagnetic repulsion as a simple means of focussing objects in continuous flow, based only on their intrinsic properties without the requirement of any label. Diamagnetic polystyrene particles were suspended in a paramagnetic medium and pumped through a capillary between a pair of permanent magnets, whereupon the particles were repelled by each magnet into the central axis of the capillary, thus achieving focussing. By investigating this effect, we found that the focussing was greatly enhanced with (i) increased magnetic susceptibility of the medium, (ii) reduced flow rate of the suspension, (iii) increased particle size, and (iv) increased residence time in the magnetic field. Furthermore, we applied diamagnetic repulsion to the flow focussing of living, label-free HaCaT cells.

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Numerical simulation of chainlike cluster movement of feeble magnetic particles by induced magnetic dipole moment under high magnetic fields

Cited by 17 publications

References 17 publications

“Magnetic Force Microscopy and Energy Loss Imaging of Superparamagnetic Iron Oxide Nanoparticles”

“Magnetic Force Microscopy and Energy Loss Imaging of Superparamagnetic Iron Oxide Nanoparticles”

Magnetic Processing of Diamagnetic Materials

Flow focussing of particles and cells based on their intrinsic properties using a simple diamagnetic repulsion setup

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