Magnetic microchains and microswimmers in an oscillating magnetic field

Ido, Yasushi; Li, Yan Hom; Tsutsumi, Hiroaki; Sumiyoshi, Hirotaka; Chen, Ching-Yao

doi:10.1063/1.4939945

Cited by 16 publications

(9 citation statements)

References 28 publications

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“…Magnetic colloids are being used for medical tasks such as drug delivery [1], tissue scaffolding [2], image contrast [3], and tumor reduction [4]. More exotic functions include self-assembling swimmers [5,6], walkers [7,8], grabbers [9], and self-healing membranes [10]. Both medical [11] and non-medical [12][13][14] applications benefit from using particles with extended aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

Contractile actuation and dynamical gel assembly of paramagnetic filaments in fast precessing fields

Dempster¹,

Vázquez-Montejo²,

Cruz³

2017

Phys. Rev. E

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Flexible superparamagnetic filaments are studied under the influence of fast precessing magnetic fields using simulations and a continuum approximation analysis. We find that individual filaments can be made to exert controllable tensile forces along the precession axis. These forces are exploited for microscopic actuation. In bulk, the filaments can be rapidly assembled into different configurations whose material properties depend on the field parameters. The precession frequency affects filament aggregation and conformation by changing the net torques on the filament ends. Using a time-dependent precession angle allows considerable freedom in choosing properties for filament aggregates. As an example, we design a field that twists chains together to dynamically assemble a self-healing gel.

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Section: Introductionmentioning

confidence: 99%

Contractile actuation and dynamical gel assembly of paramagnetic filaments in fast precessing fields

Dempster¹,

Vázquez-Montejo²,

Cruz³

2017

Phys. Rev. E

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“…This means that the chain may rupture and fail to reform again. The efficiency of chain reformation has also been studied [118].…”

Section: Magnetic Mixing Induced By Magnetic Bead Chainsmentioning

confidence: 99%

Microfluidic Magnetic Mixing at Low Reynolds Numbers and in Stagnant Fluids

et al. 2019

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Microfluidic mixing becomes a necessity when thorough sample homogenization is required in small volumes of fluid, such as in lab-on-a-chip devices. For example, efficient mixing is extraordinarily challenging in capillary-filling microfluidic devices and in microchambers with stagnant fluids. To address this issue, specifically designed geometrical features can enhance the effect of diffusion and provide efficient mixing by inducing chaotic fluid flow. This scheme is known as “passive” mixing. In addition, when rapid and global mixing is essential, “active” mixing can be applied by exploiting an external source. In particular, magnetic mixing (where a magnetic field acts to stimulate mixing) shows great potential for high mixing efficiency. This method generally involves magnetic beads and external (or integrated) magnets for the creation of chaotic motion in the device. However, there is still plenty of room for exploiting the potential of magnetic beads for mixing applications. Therefore, this review article focuses on the advantages of magnetic bead mixing along with recommendations on improving mixing in low Reynolds number flows (Re ≤ 1) and in stagnant fluids.

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“…Miniaturized robots have been subject to rapid development in recent years. Super-paramagnetic micro-beads with self-assembling property are widely used for reversible micro-devices in biotechnical applications such as micro-mixers (Biswal and Gast, 2004; Kang et al, 2007; Martin et al, 2009; Roy et al, 2009), sensors (Cēbers, 2005a; Goubault et al, 2003) and micro-swimmers (Dreyfus et al, 2005; Ido et al, 2016; Kokot et al, 2017; Li et al, 2012; Li et al, 2013; Lumay et al, 2013). However, there are challenges for practical applications (Erbas-Cakmak et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

The dynamics of a planar beating micro-swimmer constructed using functional fluid

Chen

2020

Journal of Intelligent Material Systems and Structures

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The dynamics of a flexible micro-swimmer that contains superparamagnetic beads of different diameter in an oscillating field is studied experimentally. Two types of artificial swimmers are fabricated to determine the flexing characteristics. The effect of key parameters that dominate the motion of the swimmer is determined. The flexibility initially increases linearly with the frequency and reaches a maximum value at a specific frequency. The field intensity has no significant effect on the flexibility when the swimmer is subjected to a higher oscillating frequency. The instantaneous speed of the swimmer increases almost linearly with the flexibility and reaches a maximum value for a swimmer with a specific geometry. On the other hand, the amplitude of the oscillation has a significant effect on swimming effectiveness. The swimmer achieves a maximum instantaneous speed of 1.78 μm/s to 3.16 μm/s when the oscillating amplitude reaches 3.7–4.2 μm. A flexible swimmer with a moderately high amplitude of oscillation generates effective propulsion in an environment with a low Reynolds number of 2.5×10−6–4.5×10−5.

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Magnetic microchains and microswimmers in an oscillating magnetic field

Cited by 16 publications

References 28 publications

Contractile actuation and dynamical gel assembly of paramagnetic filaments in fast precessing fields

Contractile actuation and dynamical gel assembly of paramagnetic filaments in fast precessing fields

Microfluidic Magnetic Mixing at Low Reynolds Numbers and in Stagnant Fluids

The dynamics of a planar beating micro-swimmer constructed using functional fluid

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