Self-driven particles in linear flows and trapped in a harmonic potential

Sandoval, Mario; Hidalgo-Gonzalez, J. C.; Jiménez–Aquino, J. I.

doi:10.1103/physreve.97.032603

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…Passive Brownian particles in such harmonic traps accumulate in the center. ABPs, on the other hand, can show many more effects: Their selfpropulsion can overcome an attractive trap potential [79], they can confine passive particles inside a trap [36], and they can form active shells [79,85]. It has also been shown experimentally that active particles inside traps can be found in the center or at a certain distance from the center, depending on the propulsion speed of the particles and strength of the trap [80].…”

Section: B Harmonic Trapsmentioning

confidence: 99%

Active Brownian particles in external force fields: field-theoretical models, generalized barometric law, and programmable density patterns

Bickmann¹,

Bröker²,

Wittkowski³

2022

Preprint

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We investigate the influence of external forces on the collective dynamics of interacting active Brownian particles in two as well as three spatial dimensions. Via explicit coarse graining, we derive predictive models that are applicable for space-and time-dependent external force fields. We study these models for the cases of gravity and harmonic traps. In particular, we derive a generalized barometric formula for interacting active Brownian particles under gravity that is valid for low to high concentrations and activities of the particles. Furthermore, we show that one can use an external harmonic trap to induce motility-induced phase separation in systems that, without external fields, remain in a homogeneous state. This finding makes it possible to realize programmable density patterns in systems of active Brownian particles. Our analytic predictions are found to be in very good agreement with Brownian dynamics simulations.

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Section: B Harmonic Trapsmentioning

confidence: 99%

Active Brownian particles in external force fields: field-theoretical models, generalized barometric law, and programmable density patterns

Bickmann¹,

Bröker²,

Wittkowski³

2022

Preprint

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“…However, active particles always moving in a complicated environment and possess more complex angular dynamics, resulting in anomalous diffusion or diffusion enhancement. For example, active particles moving in an environment full of obstacles or some external field [3][4][5][6][7][8][9][10][11][12][13][14][15], bacteria and pathogens [14,16], or artificial microswimmers (some could be used as drug deliverers) moving in the human body [17][18][19][20][21]. Normal and anomalous diffusion is characterized by the power law evolution of MSD(t) MSD(t) ∼ t α…”

Section: Introductionmentioning

confidence: 99%

Anomalous diffusion of self-align active particle in flow background

Chen¹,

Wu²

2022

Preprint

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Active particles (i.e., self-propelled particles or called microswimmers), different from passive Brownian particles, possess more complicated translational and angular dynamics, which can generate a series of anomalous transport phenomena. In this letter, we study the two-dimensional dynamics of a self-propelled pointlike particle with self-aligning property moving in Poiseuille flow.The results show the effective anomalous diffusion coefficient changes sharply with the change of temperature and speed of background Poiseuille flow. The relaxation property of moving speed and the position probability distribution function of particles is also obtained. The observation of several types of anomalous diffusion and normal diffusion regime indicates the self-aligning property may be universal and can be used as a reference for future experiments analysis and modeling.

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Inertial effects on trapped active matter

Gutierrez-Martinez

Sandoval

2020

The Journal of Chemical Physics

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In this work, the dynamics of inertial (mass and moment of inertia) active Brownian particles trapped in a harmonic well is studied. This scenario has seen success when characterizing soft passive and active overdamped matter. Motivated by the variety of applications of this system, we analytically find the effect of translational and rotational inertia on the mean-square displacement (MSD), mean-square speed (MSS), swim, Reynolds, and total pressures of a system of inertial active Brownian particles subject to a weak and a strong harmonic trap. Following a Langevin formalism, we explicitly find that as inertia grows, the systems’ MSD and total pressure are enhanced, but its MSS and swim pressure decrease. The use of Langevin dynamics simulations enables us to observe that as inertia grows, inertial active matter under a strong trap no longer “condensates” at the “border” of the trap, but it rather tends to uniformly spread in space. Our analytical results are also numerically validated.

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Self-driven particles in linear flows and trapped in a harmonic potential

Cited by 6 publications

References 24 publications

Active Brownian particles in external force fields: field-theoretical models, generalized barometric law, and programmable density patterns

Active Brownian particles in external force fields: field-theoretical models, generalized barometric law, and programmable density patterns

Anomalous diffusion of self-align active particle in flow background

Inertial effects on trapped active matter

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