Pattern formation and collective effects in populations of magnetic microswimmers

Vach, Peter J.; Walker, Debora; Fischer, Peer; Fratzl, Peter; Faivre, Damien

doi:10.1088/1361-6463/aa5d36

Cited by 40 publications

(31 citation statements)

References 30 publications

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“…By combining Eqs. (14e), (19), (18), and (15), and noting that the polynomials P 1 n (x) are even (odd) functions of x for n odd (even), one arrives at…”

Section: Squirmer and Squirming Modesmentioning

confidence: 99%

Axisymmetric spheroidal squirmers and self-diffusiophoretic particles

Pöhnl

Popescu

Uspal

2020

J. Phys.: Condens. Matter

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We study, by means of an exact analytical solution, the motion of a spheroidal, axisymmetric squirmer in an unbounded fluid, as well as the low Reynolds number hydrodynamic flow associated to it. In contrast to the case of a spherical squirmer -for which, e.g., the velocity of the squirmer and the magnitude of the stresslet associated with the flow induced by the squirmer are respectively determined by the amplitudes of the first two slip ("squirming") modes -for the spheroidal squirmer each squirming mode either contributes to the velocity, or contributes to the stresslet. The results are straightforwardly extended to the self-phoresis of axisymmetric, spheroidal, chemically active particles in the case when the phoretic slip approximation holds.

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“…By combining Eqs. (14e), (19), (18), and (15), and noting that the polynomials P 1 n (x) are even (odd) functions of x for n odd (even), one arrives at…”

Section: Squirmer and Squirming Modesmentioning

confidence: 99%

Axisymmetric spheroidal squirmers and self-diffusiophoretic particles

Pöhnl

Popescu

Uspal

2020

J. Phys.: Condens. Matter

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“…[11] estimates that the unmodeled interactions for this type of micromachine will be negligible for micromachines separated by at least five body lengths, but conjecture that the models may retain sufficient validity with denser packing. In experiments with substantially increased density, significant interactions have been observed [16]. In our scaled low-Reynolds-number experiments, shown in Fig.…”

Section: Discussionmentioning

confidence: 53%

“…to be used in biomedical applications [1][2][3]. To date, research on the control of magnetic micromachines has typically considered a single micromachine [4][5][6], a very small set of micromachines that are individually localized [7][8][9][10][11][12][13], or a group of micromachines (sometimes referred to as a "swarm") that are controlled as an aggregate unit with no ability to differentiate individual micromachines [14][15][16]. For clinical use, a medical image will likely show a group as a cloud in the image [15], and it may be unrealistic to assume that each micromachine can be individually localized and controlled.…”

Section: Introductionmentioning

confidence: 99%

Sorting Rotating Micromachines by Variations in Their Magnetic Properties

2018

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In this paper, we consider sorting for the broad class of micromachines (also known as microswimmers, microrobots, micropropellers, etc.) propelled by rotating magnetic fields. We present a control policy that capitalizes on the variation in magnetic properties between otherwise-homogeneous micromachines to enable the sorting of a select fraction of a group from the remainder and prescribe its net relative movement, using a uniform magnetic field that is applied equally to all micromachines. The method enables us to accomplish this sorting task using open-loop control, without relying on a structured environment or localization information of individual micromachines. With our method, the control time to perform the sort is invariant to the number of micromachines. The method is verified through simulations and scaled experiments. Finally, we include an extended discussion about the limitations of the method and open questions related to its practical application.

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“…However, for many synthetic magnetic microswimmers, aggregation can also be a problem since the actuation mechanism can be hindered due to this accumulation. However, it was shown that clusters of microswimmers can also be controlled by external magnetic fields, potentially enabling new areas of application …”

Section: Fundamentalsmentioning

confidence: 99%

“…However, it was shown that clusters of microswimmers can also be controlled by external magnetic fields, potentially enabling new areas of application. [79] While for some applications single propeller control or the control of a swarm of identical propellers is sufficient, it might be advantageous to be able to control a swarm of slightly different microswimmers. This might be the case "naturally" since small differences in sizes, shapes, magnetic moments, and therefore velocities might arise during the mass production of microswimmers.…”

Section: Magnetic Control Of Microswimmersmentioning

confidence: 99%

Biohybrid and Bioinspired Magnetic Microswimmers

Bente

Codutti

Bachmann

et al. 2018

Small

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116

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Many motile microorganisms swim and navigate in chemically and mechanically complex environments. These organisms can be functionalized and directly used for applications (biohybrid approach), but also inspire designs for fully synthetic microbots. The most promising designs of biohybrids and bioinspired microswimmers include one or several magnetic components, which lead to sustainable propulsion mechanisms and external controllability. This Review addresses such magnetic microswimmers, which are often studied in view of certain applications, mostly in the biomedical area, but also in the environmental field. First, propulsion systems at the microscale are reviewed and the magnetism of microswimmers is introduced. The review of the magnetic biohybrids and bioinspired microswimmers is structured gradually from mostly biological systems toward purely synthetic approaches. Finally, currently less explored parts of this field ranging from in situ imaging to swarm control are discussed.

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Pattern formation and collective effects in populations of magnetic microswimmers

Cited by 40 publications

References 30 publications

Axisymmetric spheroidal squirmers and self-diffusiophoretic particles

Axisymmetric spheroidal squirmers and self-diffusiophoretic particles

Sorting Rotating Micromachines by Variations in Their Magnetic Properties

Biohybrid and Bioinspired Magnetic Microswimmers

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