Application of superconductivity for magnetic force control in medical and industrial fields

Nishijima, Shigehiro

doi:10.1016/j.physc.2008.05.223

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…The application of electromagnets, both copper-based and superconducting, allows to achieve very high magnetic fields (> 1 T) 22 but they are characterised by smooth spatial distribution, basically homogeneous on typical biological scales 23 . Permanent magnets, especially those having rectangular or needle-like shapes 19 , 24 – 26 , may generate relatively high fields (typically in sub-Tesla range) together with sharp magnetic gradients on mm and sub-mm scales 27 , 28 .…”

Section: Introductionmentioning

confidence: 99%

Versatile magnetic configuration for the control and manipulation of superparamagnetic nanoparticles

Surpi

Shelyakova

Rivas

et al. 2023

Sci Rep

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The control and manipulation of superparamagnetic nanoparticles (SP-MNP) is a significant challenge and has become increasingly important in various fields, especially in biomedical research. Yet, most of applications rely on relatively large nanoparticles, 50 nm or higher, mainly due to the fact that the magnetic control of smaller MNPs is often hampered by the thermally induced Brownian motion. Here we present a magnetic device able to manipulate remotely in microfluidic environment SP-MNPs smaller than 10 nm. The device is based on a specifically tailored configuration of movable permanent magnets. The experiments performed in 500 µm capillary have shown the ability to concentrate the SP-MNPs into regions characterized by different shapes and sizes ranging from 100 to 200 µm. The results are explained by straightforward calculations and comparison between magnetic and thermal energies. We provide then a comprehensive description of the magnetic field intensity and its spatial distribution for the confinement and motion of magnetic nanoparticles for a wide range of sizes. We believe this description could be used to establish accurate and quantitative magnetic protocols not only for biomedical applications, but also for environment, food, security, and other areas.

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Section: Introductionmentioning

confidence: 99%

Versatile magnetic configuration for the control and manipulation of superparamagnetic nanoparticles

Surpi

Shelyakova

Rivas

et al. 2023

Sci Rep

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“…Initially, traditional magnets such as permanent magnets and resistive electromagnets were used for magnetic separation processes [16,17]. However, as superconducting technology has developed, more researchers have focused on the use of superconducting magnets for magnetic separation processes [18,19]. The cost for superconducting magnets for use in large-scale applications has been greatly reduced because of breakthroughs in the required refrigeration systems.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, power consumption by superconducting magnets is very low because their coils have no resistance below the critical temperature; therefore, operation of superconducting magnets is less expensive than operation of traditional ferromagnetic-core electromagnets [19]. Moreover, superconducting magnets have more available space that can be used for magnetic separation; accordingly, the treatment capacity of the superconducting separation processes is larger than that of traditional ferromagnetic-core electromagnets [19,20].…”

Section: Introductionmentioning

confidence: 99%

Removal of phosphate from wastewater by using open gradient superconducting magnetic separation as pretreatment for high gradient superconducting magnetic separation

Zhao

et al. 2012

Separation and Purification Technology

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a b s t r a c tThe removal of phosphate from wastewater using a combination of open gradient superconducting magnetic separation (OGMS) and high gradient superconducting magnetic separation (HGMS) was investigated. The magnetic seeding material used was Fe 3 O 4 , and a novel composite inorganic coagulant was added to combine the phosphate with the magnetic seed. The important parameters that influenced the removal efficiency of phosphate in OGMS or HGMS, slow mixing time, magnetic seeding dosage, coagulant dosage, hydraulic retention time, magnetic field strength and flow rate, were systematically investigated. The performance of the OGMS-HGMS process was evaluated by treating synthetic phosphate wastewater. The results showed that all of the investigated parameters except for slow mixing time had a significant effect on phosphate removal. The phosphate concentration was reduced from 0.50 to 0.01 mg/L under the following optimal reaction conditions: coagulant dosage, 50 mg/L; Fe 3 O 4 , 100 mg/L; magnet working current, 160 A; hydraulic retention time in OGMS, 0.5 min; and flow rate in HGMS, 2 L/min. Overall, the use of OGMS as a pretreatment for HGMS was shown to be a good method of increasing phosphate removal efficiency while simultaneously increasing the flow rate of HGMS.

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“…This property has been used in many different applications such as a superconducting maglev vehicle, a centrifugal separator, and a flywheel energy storage system. [1][2][3][4] These superconductor applications require high damping conditions as well as strong flux pinning and vibration control to ensure a stable levitation. In order to increase the levitation force, the size of the PM is increased.…”

mentioning

confidence: 99%

Enforcement of Levitation Force by Capturing Magnetic Flux between YBa₂Cu₃O_7-x Superconductor Bulk and Permanent Magnet

Song

Jang

Kim

et al. 2012

Jpn. J. Appl. Phys.

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An iron block was placed on a permanent magnet (PM) as a path to capture the magnetic flux between a high-temperature superconductor (HTS) bulk and a PM. The effects of the magnetic flux for different iron block thicknesses (0, 2, 4, and 6 mm), configurations, and dimensions were experimentally determined. The optimal conditions for increasing the levitation force, which increased with decreasing air gap between the iron block and the PM, and with increasing iron block thickness, were determined. As the area of the iron block decreased, the levitation force increased, reaching a saturation point. Some iron block configurations acted as a path to capture the magnetic flux, and a higher levitation force was observed for a certain gap distance. Software simulation results support the obtained experimental results.

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Application of superconductivity for magnetic force control in medical and industrial fields

Cited by 10 publications

References 14 publications

Versatile magnetic configuration for the control and manipulation of superparamagnetic nanoparticles

Versatile magnetic configuration for the control and manipulation of superparamagnetic nanoparticles

Removal of phosphate from wastewater by using open gradient superconducting magnetic separation as pretreatment for high gradient superconducting magnetic separation

Enforcement of Levitation Force by Capturing Magnetic Flux between YBa₂Cu₃O_7-x Superconductor Bulk and Permanent Magnet

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Application of superconductivity for magnetic force control in medical and industrial fields

Cited by 10 publications

References 14 publications

Versatile magnetic configuration for the control and manipulation of superparamagnetic nanoparticles

Versatile magnetic configuration for the control and manipulation of superparamagnetic nanoparticles

Removal of phosphate from wastewater by using open gradient superconducting magnetic separation as pretreatment for high gradient superconducting magnetic separation

Enforcement of Levitation Force by Capturing Magnetic Flux between YBa2Cu3O7-x Superconductor Bulk and Permanent Magnet

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Enforcement of Levitation Force by Capturing Magnetic Flux between YBa₂Cu₃O_7-x Superconductor Bulk and Permanent Magnet