Hydrodynamic collision between a microswimmer and a passive particle in a micro-channel

Purushothaman, Ahana; Thampi, Sumesh P.

doi:10.1039/d0sm02140g

Cited by 10 publications

(7 citation statements)

References 47 publications

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“…In our experiments, we observed that during the approach, once the particles are close to enforce strong hydrodynamic interactions, the JP rotates slightly in a direction away from the tracer. This initial deflection behavior of the active colloid agrees well with the recent analytical prediction by Purushothaman and Thampi that for the collision between a puller microswimmer and a tracer, the long-ranged hydrodynamic interactions successfully modify the flow-field, causing the JP to rotate away from the tracer. This behavior is also consistent with the reorientation of the active JP on approaching an impenetrable wall attempting to minimize the normal velocity component along the normal to the boundary .…”

Section: Results and Discussionsupporting

confidence: 89%

Interaction of Active Janus Colloids with Tracers

et al. 2022

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Understanding the motion of artificial active swimmers in complex surroundings, such as a dense bath of passive particulate matter, is essential for their successful utilization as cargo (drug) carriers and sensors or for medical imaging, under microscopic domains. In this study, we experimentally investigated the motion of active SiO2–Pt Janus particles (JPs) in a two-dimensional bath of smaller silica tracers dispersed with varying areal densities. Our observations indicate that when an active JP undergoes a collision with an isolated tracer, their interaction can have a significant impact on the swimmer’s motion. However, the overall impact of tracers on the active JPs’ motion (translation and rotation) depends on the frequency of collisions and also on the nature of the collision, which is marked by the time-duration for which the particles maintain contact during the collisions. Further, in the high-density tracer bath, our experiments reveal that the motion of the active JP results in a novel organizational behavior of the tracers on the trailing Pt (depletion of tracers) and the leading SiO2 (accumulation of tracers) side. In laboratory frame the emergence and the subsequent vanishing of the depletion zone are discussed in detail.

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Section: Results and Discussionsupporting

confidence: 89%

Interaction of Active Janus Colloids with Tracers

et al. 2022

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“…However, the drift volume is finite for microswimmers that do not exert a net force on the liquid [7,8]. Hydrodynamic entrainment can be a curse and a blessing: it is important in a wide range of biological and ecological processes, including enhanced diffusion [9][10][11][12][13][14][15][16][17][18], biogenic mixing [19][20][21][22][23][24], food uptake [25][26][27][28][29], particle transport [30][31][32][33][34], fungal spore dispersal [35], oxygen redistribution [36], and microbial interaction probabilities [37].…”

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confidence: 99%

Collective Entrainment and Confinement Amplify Transport by Schooling Microswimmers

et al. 2021

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“…The swimming microrobots using biomimetic swimming strategies and microscale fluid dynamics have recently made great progress. [ 1 ] These untethered microtools can establish flexible interactions between the macro world and the micro fluid environment, [ 2 ] and have shown important applications in various fields where precise micromanipulation is needed, for example, drug delivery, [ 3 ] single cell manipulation, [ 4 ] and micromotor navigation. [ 5 ] Compared with the traditional micromanipulation methods using microneedles or micropipettes, [ 6 ] newly developed microrobots can accurately manipulate single micro‐target with a smart and less invasive manner.…”

Section: Introductionmentioning

confidence: 99%

Multimodal Bubble Microrobot Near an Air–Water Interface

Wang

Chen

Zheng

et al. 2022

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The development of multifunctional and robust swimming microrobots working at the free air–liquid interface has encountered challenge as new manipulation strategies are needed to overcome the complicated interfacial restrictions. Here, flexible but reliable mechanisms are shown that achieve a remote‐control bubble microrobot with multiple working modes and high maneuverability by the assistance of a soft air–liquid interface. This bubble microrobot is developed from a hollow Janus microsphere (JM) regulated by a magnetic field, which can implement switchable working modes like pusher, gripper, anchor, and sweeper. The collapse of the microbubble and the accompanying directional jet flow play a key role for functioning in these working modes, which is analogous to a “bubble tentacle.” Using a simple gamepad, the orientation and the navigation of the bubble microrobot can be easily manipulated. In particular, a speed modulation method is found for the bubble microrobot, which uses vertical magnetic field to control the orientation of the JM and the direction of the bubble‐induced jet flow without changing the fuel concentration. The findings demonstrate a substantial advance of the bubble microrobot specifically working at the air–liquid interface and depict some nonintuitive mechanisms that can help develop more complicated microswimmers.

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Hydrodynamic collision between a microswimmer and a passive particle in a micro-channel

Abstract: Microswimmers interacting with passive particles in confinement is common in many systems, e.g., spermatozoa cells encountering other cells or debris in female reproductive tract or active particles interacting with polymers...

Cited by 10 publications

References 47 publications

Interaction of Active Janus Colloids with Tracers

Interaction of Active Janus Colloids with Tracers

Collective Entrainment and Confinement Amplify Transport by Schooling Microswimmers

Multimodal Bubble Microrobot Near an Air–Water Interface

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