Active Brownian particles escaping a channel in single file

Locatelli, Emanuele; Baldovin, Fulvio; Orlandini, Enzo

doi:10.1103/physreve.91.022109

Cited by 31 publications

(19 citation statements)

References 48 publications

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“…For future work, it would be of interest to perform similar joint theoretical and experimental analysis of suspensions of other micro-organisms confined within slits by considering either other motility patterns (e.g., smooth or reverse and flick motion [57]) or cells with different aspect ratios. More important, increasing the bacteria concentration or strongly confining the suspension in microfluidic channels [58,59] would provide useful insights on the interplay between crowding and confinement.…”

Section: Discussionmentioning

confidence: 99%

Wall accumulation of bacteria with different motility patterns

et al. 2018

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We systematically investigate the role of different swimming patterns on the concentration distribution of bacterial suspensions confined between two flat walls, by considering wild-type motility Escherichia coli and Pseudomonas aeruginosa, which perform Run and Tumble and Run and Reverse patterns, respectively. The experiments count motile bacteria at different distances from the bottom wall. In agreement with previous studies, an accumulation of motile bacteria close to the walls is observed. Different wall separations, ranging from 100 to 250μm, are tested. The concentration profiles result to be independent on the motility pattern and on the walls' separation. These results are confirmed by numerical simulations, based on a collection of self-propelled dumbbells-like particles interacting only through steric interactions. The good agreement with the simulations suggests that the behavior of the investigated bacterial suspensions is determined mainly by steric collisions and self-propulsion, as well as hydrodynamic interactions.

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Section: Discussionmentioning

confidence: 99%

Wall accumulation of bacteria with different motility patterns

et al. 2018

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“…These traveling states, corresponding to the formation of a single velocity domain, occur for L v 0 τ and are not discussed in this paper. At variance with previous studies [43,[75][76][77][78], we consider high-density regimes, in such a way that the one-dimensional system of active particles is compact enough and neither defects in the periodic arrangement of the particles nor clusters can easily form: the system attains homogeneous configurations for the whole set of parameters numerically explored in this work.…”

Section: A Numerical Simulationsmentioning

confidence: 99%

Time-dependent properties of interacting active matter: Dynamical behavior of one-dimensional systems of self-propelled particles

Caprini

Marconi

2020

Phys. Rev. Research

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We study an interacting high-density one-dimensional system of self-propelled particles described by the active Ornstein-Uhlenbeck particle model where, even in the absence of alignment interactions, velocity and energy domains spontaneously form in analogy with those already observed in two dimensions. Such domains are regions where the individual velocities are spatially correlated as a result of the interplay between self-propulsion and interactions. Their typical size is controlled by a characteristic correlation length. In this work, we focus on a lesser-known aspect of the model, namely, its dynamical behavior. To this purpose, we investigate theoretically and numerically the time-dependent velocity autocorrelation and spatiotemporal velocity correlation functions. The study of these correlations provides a measure of the average lifetime and, thus, the stability in time of the velocity domains.

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“…For unbounded systems in absence of walls, depending on the turning rate and the number of particles that are allowed to overlap, particles can either aggregate in few big clusters after a coarsening process, develop many small clusters, or form an homogeneous gas, as it has been seen for lattice [23][24][25][26] and off-lattice cases [27][28][29][30][31][32][33][34][35][36]. Here, we show that in all models, for parameters corresponding to the bulk homogeneous gas phase, in presence of a wall, three phases can develop.…”

Section: Introductionmentioning

confidence: 96%

Universality of active wetting transitions

Sepulveda

Soto

2018

Phys. Rev. E

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Four on-lattice and six off-lattice models for active matter are studied numerically, showing that in contact with a wall, they display universal wetting transitions between three distinctive phases. The particles, which interact via exclusion volume only, move persistently and, depending on the model, change their direction either via tumble processes or rotational diffusion. When increasing the turning rate νT , the systems transit from total wetting, to partial wetting and dewetted phases. In the first phase, a wetting film covers the wall, with increasing heights while decreasing νT . The second phase is characterized by wetting droplets on the walls. And, finally, the walls dries with few particles in contact with it. These phases present two continuous non-equilibrium transitions. For the first transition, from partial to total wetting, the fraction of dry sites vanishes continuously when decreasing νT , with a power law of exponent 1. And, for the second transition, an order parameter proportional to the excess mass in droplets decreases continuously with a power law of exponent 3 when approaching a critical value of νT . The critical exponents are the same for all the models studied.

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Active Brownian particles escaping a channel in single file

Cited by 31 publications

References 48 publications

Wall accumulation of bacteria with different motility patterns

Wall accumulation of bacteria with different motility patterns

Time-dependent properties of interacting active matter: Dynamical behavior of one-dimensional systems of self-propelled particles

Universality of active wetting transitions

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