Magnetophoretic and Dielectrophoretic Actuations Coupled with Diamagnetic Trapping in Air and Liquids

Kauffmann, Paul; Chetouani, Hichem; Pham, Pascale; Haguet, Vincent; Reyne, Gilbert

doi:10.1166/sl.2009.1082

Cited by 5 publications

(2 citation statements)

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“…Han and Frazier 53,54 developed a diamagnetic capture (DMC) mode microseparator in which an integrated ferromagnetic wire was used to separate red (paramagnetic when deoxygenated) and white (diamagnetic) blood cells in whole blood when exposed to a magnetic field. Chetouani et al 55 used diamagnetic levitation to guide microparticles and droplets along magnetic grooves, and Kauffmann et al 56 used a similar system to guide levitated particles using magnetophoresis and dielectrophoresis. Winkleman et al 46 developed a microfluidic device in which particles were continuously separated based on their densities by balancing diamagnetic forces against opposing gravitational forces, such that the particles exited the chip at different heights.…”

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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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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“…They have many potential applications in the field of magnetic microelectromechanical systems, 1 as well as for biasing, 2 diamagnetic levitation, 3 the manipulation and trapping of particles and atoms, 4,5 etc. The use of permanent magnets to produce the flux favors autonomy and stability while down-scaling the size of the magnet does not lead to a reduction in the flux density achievable from a given material.…”

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confidence: 99%

Thermomagnetically patterned micromagnets

Dumas-Bouchiat¹,

Zanini²,

Kustov³

et al. 2010

Applied Physics Letters

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International audienceThermomagnetic patterning TMP of 4 m thick high performance NdFeB hard magnetic films deposited on Si substrates has been achieved using single pulsed laser irradiation. Uniaxially magnetised chessboard and stripe patterns with lateral feature sizes in the range 50-100 m were produced. The depth of reversal was estimated, using both global vibrating sample magnetometry and localized scanning Hall probe measurements, to be in the range of 1.1-1.2 m. A simple model provides semiquantitative agreement with the experimental results. A linear Halbach array was fabricated to demonstrate the potential of TMP for the realization of complex multidirectional microflux sources

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Placing Dielectrophoresis into Context as a Particle Manipulator

2017

Dielectrophoresis

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Magnetophoretic and Dielectrophoretic Actuations Coupled with Diamagnetic Trapping in Air and Liquids

Cited by 5 publications

References 0 publications

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

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

Thermomagnetically patterned micromagnets

Placing Dielectrophoresis into Context as a Particle Manipulator

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