Transport of active particles induced by wedge-shaped barriers in straight channels with hard and soft walls

Wu, Jianchun; Lv, Kui; Zhao, Wenwen; Ai, Bao-quan

doi:10.1063/1.5050614

Cited by 19 publications

(13 citation statements)

References 55 publications

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“…Since most of the micron-scaled active systems in nature are confined [38], it becomes imperative to understand how the dynamics of these active particles get modified in the presence of such walls [39]. It has been shown recently that the wall-adhesion properties of active particles can be utilized for sorting and trapping of such particles, by effectively tuning the wall geometry [40][41][42][43][44]. In addition, tuning the wall penetrability of particles also changes their properties near the wall, which has potential applications in specific biomedical processes involving drug delivery [45,46].…”

Section: Introductionmentioning

confidence: 99%

Aggregate morphology of active Brownian particles on porous, circular walls

Das,

Ghosh,

Chelakkot

2020

Preprint

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We study the motility-induced aggregation of active Brownian particles on a porous, circular wall. We observe that the morphology of aggregated dense-phase on a static wall depends on the wall porosity, particle motility, and the radius of the circular wall. Our analysis reveals two morphologically distinct, dense aggregates; a connected dense cluster that spreads uniformly on the circular wall, and a localized cluster which breaks the rotational symmetry of the system. These distinct morphological states are similar to the transitions obtained in planar, porous walls. We systematically analyze the parameter regimes where the different morphological states are observed. We further extend our analysis to motile circular rings and show that the ring propels ballistically due to the force applied by the active particles when the dense particle aggregates form a localized cluster, thus spontaneously extracting effective work from the system.

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Section: Introductionmentioning

confidence: 99%

Aggregate morphology of active Brownian particles on porous, circular walls

Das,

Ghosh,

Chelakkot

2020

Preprint

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“…The interaction force on a particle i due to the freezing obstacles is assumed to be of the linear spring form [47], which reads…”

Section: Modelmentioning

confidence: 99%

Confined diffusion in a random Lorentz gas environment

Khatri

Burada

2020

Phys. Rev. E

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We study the diffusive behavior of biased Brownian particles in a two dimensional confined geometry filled with the freezing obstacles. The transport properties of these particles are investigated for various values of the obstacles density η and the scaling parameter f , which is the ratio of work done to the particles to available thermal energy. We show that, when the thermal fluctuations dominate over the external force, i.e., small f regime, particles get trapped in the given environment when the system percolates at the critical obstacles density η c ≈ 1.2. However, as f increases, we observe that particles trapping occurs prior to η c. In particular, we find a relation between η and f which provides an estimate of the minimum η up to a critical scaling parameter f c beyond which the Fick-Jacobs description is invalid. Prominent transport features like nonmonotonic behavior of the nonlinear mobility, anomalous diffusion, and greatly enhanced effective diffusion coefficient are explained for various strengths of f and η. Also, it is interesting to observe that particles exhibit different kinds of diffusive behaviors, i.e., subdiffusion, normal diffusion, and superdiffusion. These findings, which are genuine to the confined and random Lorentz gas environment, can be useful to understand the transport of small particles or molecules in systems such as molecular sieves and porous media which have a complex heterogeneous environment of the freezing obstacles.

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“…[8][9][10] Being inherently out-of-equilibrium, they show interesting dynamic behaviors such as phase separation, clustering and spontaneous rectification. [11][12][13][14][15][16][17][18][19][20] Usually, active matter has a rod-like or filament-like shape rather than spherical. Typical examples include nanorods and various bacteria.…”

Section: Introductionmentioning

confidence: 99%