Model microswimmers in channels with varying cross section

Malgaretti, Paolo; Stark, Holger

doi:10.1063/1.4981886

Cited by 57 publications

(54 citation statements)

References 64 publications

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“…Ref. 44 shows that the accumulation near the walls also depends on the hydrodynamics interactions. As a consequence, the efficiency peak in Fig.9 shifts towards larger or smaller values of D r L/U 0 in the case of pullers or pushers, respectively.…”

Section: Escape Process Of Active Particles From the Wedgementioning

confidence: 99%

Transport of active particles in an open-wedge channel

Caprini

Cecconi

Marconi

2019

The Journal of Chemical Physics

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The transport of independent active Brownian particles within a two-dimensional narrow channel, modeled as an open-wedge, is studied both numerically and theoretically. We show that the active force tends to localize the particles near the walls thus reducing the effect of the entropic force which, instead, is prevailing in the case of passive particles. As a consequence, the exit of active particles from the smaller side of the channel is facilitated with respect to their passive counterpart. By continuously re-injecting particles in the middle of the wedge, we obtain a steady regime whose properties are investigated with and without the presence of an external constant driving field. We characterize the statistics and properties of the exit process from the two opposite sides of the channel, also by making a comparison between the active and passive case. Our study reveals the existence of an optimal value of the persistence time of the active force which is able to guarantee the maximal efficiency in the transport process. 1 arXiv:1901.08888v2 [cond-mat.stat-mech]

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Section: Escape Process Of Active Particles From the Wedgementioning

confidence: 99%

Transport of active particles in an open-wedge channel

Caprini

Cecconi

Marconi

2019

The Journal of Chemical Physics

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“…The dynamics of the active particle is not only modified in heterogeneous substrates, but it can also be modified us-ing a confined channel. The boundary of the confined wall plays an important role in the motion of active particles [27][28][29][30]. Recently, Dey et al, showed that the confinement can enhance the average rate of binding of the motor-cargo complexes to the microtubule, which leads to an enhancement in the average velocity [28].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Dey et al, showed that the confinement can enhance the average rate of binding of the motor-cargo complexes to the microtubule, which leads to an enhancement in the average velocity [28]. Also the asymmetric channel corrugation induces a net-flux in the motion of microswimmers along the channel, the strength and direction of which strongly depends on the swimmer type [29]. Furthermore, a non-zero average drift can be induced in ABP using potential modulation between two directions in a 2D periodic corrugated channel [30].…”

Section: Introductionmentioning

confidence: 99%

Enhanced dynamics of active Brownian particles in periodic obstacle arrays and corrugated channels

et al. 2019

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We study the motion of an active Brownian particle (ABP) using overdamped Langevin dynamics on a two-dimensional substrate with periodic array of obstacles and in a quasi-one-dimensional corrugated channel comprised of periodically arrayed obstacles. The periodic arrangement of the obstacles enhances the persistent motion of the ABP in comparison to its motion in the free space. Persistent motion increases with the activity of the ABP. We note that the periodic arrangement induces directionality in ABP motion at late time, and it increases with the size of the obstacles. We also note that the ABP exhibits a super-diffusive dynamics in the corrugated channel. The transport property is independent of the shape of the channel; rather it depends on the packing fraction of the obstacles in the system. However, the ABP shows the usual diffusive dynamics in the quasi-one-dimensional channel with flat boundary.

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“…(16), but can be tuned by adding an offset ∆ρ to Eq. (16), which controls the wettability of the colloid. Finally, as usual the Shan-Chen forces are used to compute the force acting on the colloid:…”

Section: A the Lattice Boltzmann Methodsmentioning

confidence: 99%

Numerical simulations of self-diffusiophoretic colloids at fluid interfaces

et al. 2020

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The dynamics of active colloids is very sensitive to the presence of boundaries and interfaces which therefore can be used to control their motion. Here we analyze the dynamics of active colloids adsorbed at a fluid-fluid interface. By using a mesoscopic numerical approach which relies on an approximated numerical solution of the Navier-Stokes equation, we show that when adsorbed at a fluid interface, an active colloid experiences a net torque even in the absence of a viscosity contrast between the two adjacent fluids. In particular, we study the dependence of this torque on the contact angle of the colloid with the fluid-fluid interface and on its surface properties. We rationalize our results via an approximate approach which accounts for the appearance of a local friction coefficient. By providing insight into the dynamics of active colloids adsorbed at fluid interfaces, our results are relevant for two-dimensional self assembly and emulsion stabilization by means of active colloids. * malgaretti@is.mpg.de

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Model microswimmers in channels with varying cross section

Cited by 57 publications

References 64 publications

Transport of active particles in an open-wedge channel

Transport of active particles in an open-wedge channel

Enhanced dynamics of active Brownian particles in periodic obstacle arrays and corrugated channels

Numerical simulations of self-diffusiophoretic colloids at fluid interfaces

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