Magnetophoresis of colloidal particles in a dispersion of superparamagnetic nanoparticles: theory and experiments

Benelmekki, Maria; Martínez, Laura Martínez; Andreu, Jordi S.; Camacho, J.; Faraudo, Jordi

doi:10.1039/c2sm25243k

Cited by 27 publications

(26 citation statements)

References 18 publications

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“…We speculate that these observed "pseudomagnetic" polystyrene particles are formed due to the attachment of magnetic nanoparticles (the content of the suspending ferrofluid) onto their surfaces, which has been reported in a recent experiment. 40 The magnetically focused 5 lm and 15 lm particles travel through the U-turn along its outer corner in a single stream as seen in Figure 3(c). However, in the same figure one can see that 5 lm particles start being deflected by positive magnetophoresis towards the inner corner (where the magnetic field is higher) soon after the U-turn.…”

Section: Resultsmentioning

confidence: 99%

Continuous sheath-free magnetic separation of particles in a U-shaped microchannel

Liang¹,

Xuan²

2012

Biomicrofluidics

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Particle separation is important to many chemical and biomedical applications. Magnetic field-induced particle separation is simple, cheap, and free of fluid heating issues that accompany electric, acoustic, and optical methods. We develop herein a novel microfluidic approach to continuous sheath-free magnetic separation of particles. This approach exploits the negative or positive magnetophoretic deflection to focus and separate particles in the two branches of a U-shaped microchannel, respectively. It is applicable to both magnetic and diamagnetic particle separations, and is demonstrated through the sorting of 5 lm and 15 lm polystyrene particles suspended in a dilute ferrofluid. V C 2012 American Institute of Physics. [http://dx

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Section: Resultsmentioning

confidence: 99%

Continuous sheath-free magnetic separation of particles in a U-shaped microchannel

Liang¹,

Xuan²

2012

Biomicrofluidics

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“…Its understanding is essential for the application of nanoparticles in magnetic separation processes, however, the theory involved is yet under development and has been the subject of many recent discussions [1][2][3][4][5]. In addition , the advances in the experimental procedures remain yet quite limited.…”

Section: Probing Magnetophoresismentioning

confidence: 99%

“…Superparamagnetic nanoparticles (MagNP) are being extensively explored in nanotechnology, and one of the recent applications deals with magnetic separations at the nanoscale (magnetophoresis) [1][2][3][4][5] and elemental processing in the mineral area [6,7] (magnetic nanohydrometallurgy) [8][9][10]. The understanding of such processes can lead to important technological advances in metal ion extraction, separation and recovery, as well as in electrowinning processes, including environmental remediation involving the capture and removal of heavy metal contaminants from industrial effluents [11,12].…”

Section: Introductionmentioning

confidence: 99%

Magnetophoresis of Superparamagnetic Nanoparticles Applied to the Extraction of Lanthanide Ions in the Presence of Magnetic Field

Melo¹,

Almeida²,

Santos³

et al. 2017

NanoWorld J

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Magnetic migration (magnetophoresis) and extraction of Dy 3+ ions by magnetite (Fe 3 O 4 ) nanoparticles functionalized with diethylenetriaminepentaacetic acid (MagNP@DTPA) were probed , using an analytical balance and an external weighing device comprising a miniature neodymium (Nd 2 Fe 14 B) magnet and a Lego ® system. Contrary to our expectation, when the paramagnetic Dy 3+ ions were captured by the superparamagnetic nanoparticles, the overall magnetization decreased, due to the anti-ferromagnetic dipolar interactions between the lanthanide ion and the superparamagnetic core. This finding allowed to monitor, in real time, the lanthanide extraction process (nanohydrometallurgy) and the nanoparticles migration in the magnetic field.

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“…63 The subject is related to magnetophoresis, an emerging area of investigation, aiming the use of superparamagnetic nanoparticles in separation processes, by analogy to electrophoresis. However, magnetophoresis is not completely understood yet, and has been the subject of many recent studies, [64][65][66][67][68] particularly focusing on theoretical aspects.…”

Section: Magnetophoretic Study Of the Capture Of Lanthanide Ions By Nmentioning

confidence: 99%

Green Processing of Strategic Elements Based on Magnetic Nanohydrometallurgy

Condomitti¹,

Almeida²,

Silveira³

et al. 2018

J. Braz. Chem. Soc.

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Magnetic nanohydrometallurgy (NHM) is a new process based on engineered superparamagnetic nanoparticles capable of performing as complexing agents for extracting and recovering strategic metals from mineral sources and urban wastes, as well as for removing hazardous elements from contaminated water. Its principles and application are reviewed in this paper. Typical examples involving copper, silver and mercury processing are here discussed, including the exploitation of a novel nanotechnological strategy for capturing and fractionating rare earth elements.

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Magnetophoresis of colloidal particles in a dispersion of superparamagnetic nanoparticles: theory and experiments

Cited by 27 publications

References 18 publications

Continuous sheath-free magnetic separation of particles in a U-shaped microchannel

Continuous sheath-free magnetic separation of particles in a U-shaped microchannel

Magnetophoresis of Superparamagnetic Nanoparticles Applied to the Extraction of Lanthanide Ions in the Presence of Magnetic Field

Green Processing of Strategic Elements Based on Magnetic Nanohydrometallurgy

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