Magnetophoresis and electromagnetophoresis of microparticles in liquids

Watarai, Hitoshi; Suwa, Masayori; Iiguni, Yoshinori

doi:10.1007/s00216-003-2354-7

Cited by 97 publications

(78 citation statements)

References 36 publications

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“…Normally, this magnetic fieldinduced migration of particles in liquids is called electromagnetophoresis. [1][2][3][4] However, if the applied external magnetic field is removed, how does the electric current affect the movement of the neutral particles? It has been known that the electric current causes electromigration.…”

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confidence: 99%

Electric current-driven migration of electrically neutral particles in liquids

Zhang

Qin

2014

Applied Physics Letters

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We design and experimentally demonstrate a migration of electrically neutral particles in liquids driven by electric current according to the discrepancies of their electrical conductivities. A force from electric current to electrically neutral particles has been identified to drive the particles toward the lateral surface from the centre of suspension via three distinguishable zones, namely pushing, trapping and expelling zones. The driving force can overtake gravity in practical cases. The property of the force is found neither similar to that of the force in electromagnetophoresis nor similar to that of the electromigration force in terms of direction and magnitude. An expression for the force at the pushing zone has been developed based on the numerical calculation of the thermodynamics of suspension fluids.The excellent agreement between numerical calculations and experimental data demonstrates that our calculation provides fundamental and predictive insight into particles separation from the liquids. Therefore, it is possible to use the force in many engineering applications such as separation of particles according to the differences of their electrical conductivities. *Corresponding authors.

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confidence: 99%

Electric current-driven migration of electrically neutral particles in liquids

Zhang

Qin

2014

Applied Physics Letters

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“…The magnetic permeability of the materials is less than the permeability of free space (µ 0 = 4π × 10 −7 Hm −1 ). Paramagnetism indicates the property of magnetic materials magnetized in a direction generally similar to an external magnetic field; accordingly, they are weakly attracted to an approaching magnet [103]. The magnetized status is not retained in the absence of the applied magnetic field because electron spins are randomized by thermal fluctuations.…”

Section: Magnetophoresismentioning

confidence: 99%

Microfluidic Technology for Cell Manipulation

Kwon

2018

Applied Sciences

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Featured Application: Microfluidic manipulation techniques not only improve the efficiency and reliability of biological/clinical analysis, but also further enable the development of a high-performance bioassay system. Abstract: Microfluidic techniques for cell manipulation have been constantly developed and integrated into small chips for high-performance bioassays. However, the drawbacks of each of the techniques often hindered their further advancement and their wide use in biotechnology. To overcome this difficulty, an examination and understanding of various aspects of the developed manipulation techniques are required. In this review, we provide the details of primary microfluidic techniques that have received much attention for bioassays. First, we introduce the manipulation techniques using a sole driving source, i.e., dielectrophoresis, electrophoresis, optical tweezers, magnetophoresis, and acoustophoresis. Next, we present rapid electrokinetic patterning, a hybrid opto-electric manipulation technique developed recently. It is introduced in detail along with the underlying physical principle, operating environment, and current challenges. This paper will offer readers the opportunity to improve existing manipulation techniques, suggest new manipulation techniques, and find new applications in biotechnology.

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“…6 However, up to now, there are only limited reports concerning the combination of QCM and an external force, like a magnetic force, though magnetic forces have been applied for the separation of diamagnetic particles, called magnetophoresis. [7][8][9][10] No report has been found on the application of QCM for the detection and analysis of chemical interactions by applying a magnetic field.…”

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confidence: 99%