Algebraic correlations and anomalous fluctuations in ordered flocks of Janus particles fueled by an AC electric field

Iwasawa, Junichiro; Nishiguchi, Daiki; Sano, Masaki

doi:10.1103/physrevresearch.3.043104

Cited by 15 publications

(10 citation statements)

References 55 publications

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“…Therefore, our findings may trigger further quantification and theoretical devel- opment of the peculiar quasi-2D hydrodynamics. From the active matter viewpoint, the pillar-swimmer interactions quantified in our experiments can also be translated into the understandings of inter-particle interactions, which gives new insight on collective behavior in lower dimensions such as bacterial long-range nematic order in quasi-2D [11], bacterial noncontact cohesive swimming in 2D [32], and colloidal swimmers under confinements [33][34][35][36] In terms of application, the relation between the trap efficiency and the structure of the space confirmed in this experiment can serve as a design principle for active microfluidic devices using microswimmers.…”

Section: (B) Inset)mentioning

confidence: 91%

Quasi-two-dimensional bacterial swimming around pillars: enhanced trapping efficiency and curvature dependence

Takaha¹,

Nishiguchi²

2022

Preprint

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Microswimmers exhibit more diverse behavior in quasi-two dimensions than in three dimensions. Such behavior remains elusive due to the analytical difficulty of dealing with two parallel solid boundaries. The existence of additional obstacles in quasi-two-dimensional systems further complicates the analysis. We fabricated microscopic pillars in quasi-two dimensions by etching glass coverslips and observed the interactions between swimming bacteria and the pillars. Bacteria got trapped around the circular pillars and the trapping efficiency increased as the quasi-two-dimensionality was increased or as the curvature of the pillars was decreased. Experiments with elliptic pillars demonstrated the possibility that the local curvature of the obstacle controls the trapping efficiency.

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Section: (B) Inset)mentioning

confidence: 91%

Quasi-two-dimensional bacterial swimming around pillars: enhanced trapping efficiency and curvature dependence

Takaha¹,

Nishiguchi²

2022

Preprint

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“…One of the main advantages of using artificial self-propelled particles is controllability. Typically, self-propulsion speed can be controlled externally within some range; for example, speed of Janus particles driven by induced-charge electrophoresis 16,[18][19][20] and that of Quincke rollers 21,22 can be controlled by the strength of the electric field. In such systems driven by an external field, active and passive states can also be switched by turning the field on and off 23,27,28 or otherwise, 19 leading to motions reminiscent of run-and-tumbling of E. coli.…”

Section: For a Review)mentioning

confidence: 99%

“…These include experimental studies using systems from microscopic to macroscopic scales, and from biological to artificial systems. Examples of artificial experimental systems are shaken rods and disks, 12,13 Janus particles, [6][7][8][9][14][15][16][17][18][19][20] Quincke rollers, [21][22][23][24] floating droplets, 25,26 and so on (see ref. 2…”

Section: Introductionmentioning

confidence: 99%

Active colloid with externally induced periodic bipolar motility and its cooperative motion

Takeuchi

Sano

2022

Soft Matter

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“…These include experimental studies using systems from microscopic to macroscopic scales, and from biological to artificial systems. Examples of artificial experimental systems are shaken rods and disks [12,13], Janus particles [6][7][8][9][14][15][16][17][18][19][20], Quincke rollers [21][22][23][24], floating droplets [25,26], and so on (see [2] for a review).…”

Section: Introductionmentioning

confidence: 99%

“…One of the main advantages of using artificial self-propelled particles is controllability. Typically, self-propulsion speed can be controlled externally within some range; for example, speed of Janus particles driven by induced-charge electrophoresis [16,[18][19][20] and that of Quincke rollers [21,22] can be controlled by the strength of the electric field. In such systems driven by an external field, active and passive states can also be switched by turning the field on and off [23,27] or otherwise [19], leading to motions reminiscent of run-and-tumbling of E.coli.…”

Section: Introductionmentioning

confidence: 99%

Active colloid with externally induced periodic bipolar motility and its cooperative motion

Kato,

Takeuchi,

Sano

2022

Preprint

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Active matter physics has been developed with various types of self-propelled particles, including those with polar and bipolar motility and beyond. However, the bipolar motions experimentally realized so far have been either random along the axis or periodic at intrinsic frequencies. Here we report another kind of bipolar active particles, whose periodic bipolar self-propulsion is set externally at a controllable frequency. We used Quincke rollers-dielectric particles suspended in a conducting liquid driven by an electric field-under an AC electric field instead of the usually used DC field. Reciprocating motion of a single particle at the external frequency was observed experimentally and characterized theoretically as stable periodic motion. Experimentally, we observed not only the reciprocating motion but also non-trivial Active Brownian Particle (ABP)-like persistent motion in a long time scale. This resulted in a Lorentzian spectrum around zero frequency, which is not accounted for by a simple extension of the conventional model of Quincke rollers to the AC field. It was found that ABP-like motion can be reproduced by considering the top-bottom asymmetry in the experimental system. Moreover, we found a rotational diffusion coefficient much larger than the thermal one, as also reported in previous experiments, which may have resulted from roughness of the electrode surface. We also found self-organized formation of small clusters, such as doublets and triplets, and characterized cooperative motion of particles therein. The AC Quincke rollers reported here may serve as a model experimental system of bipolar active matter, which appears to deserve further investigations.

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Algebraic correlations and anomalous fluctuations in ordered flocks of Janus particles fueled by an AC electric field

Cited by 15 publications

References 55 publications

Quasi-two-dimensional bacterial swimming around pillars: enhanced trapping efficiency and curvature dependence

Quasi-two-dimensional bacterial swimming around pillars: enhanced trapping efficiency and curvature dependence

Active colloid with externally induced periodic bipolar motility and its cooperative motion

Active colloid with externally induced periodic bipolar motility and its cooperative motion

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