Segregation of oppositely driven colloidal particles in hard-walled channels: A finite-size study

Heinze, Birte; Siems, Ullrich; Nielaba, Peter

doi:10.1103/physreve.92.012323

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…A similar lane-formation phenomenon has also been demonstrated in simulations of binary oppositely charged particles [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] as well as experiments [32][33][34][35]. The phase diagram of the lane formation has been examined for various combinations of the external force and the density under the * kk@cheng.es.osaka-u.ac.jp periodic boundary condition [17][18][19][20][21]31] or with confined geometry [27,29]. The finite-size effect has also been investigated [25,27,29].…”

Section: Introductionsupporting

confidence: 64%

“…The phase diagram of the lane formation has been examined for various combinations of the external force and the density under the * kk@cheng.es.osaka-u.ac.jp periodic boundary condition [17][18][19][20][21]31] or with confined geometry [27,29]. The finite-size effect has also been investigated [25,27,29]. In particular, the critical force that generates lane formation exhibits a logarithmic increase with the system size, which implies that global phase segregation cannot occur in a finite amount of time [25].…”

Section: Introductionmentioning

confidence: 99%

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Lane Formation Dynamics of Oppositely Self-Driven Binary Particles: Effects of Density and Finite System Size

Ikeda

Kim

2017

J. Phys. Soc. Jpn.

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We examined the lane formation dynamics of oppositely self-driven binary particles by molecular dynamics simulations of a two-dimensional system. Our study comprehensively revealed the effects of the density and system size on the lane formation. The phase diagram distinguishing the no-lane and lane states was systematically determined for various combinations of the anisotropic friction coefficient and the desired velocity. A peculiar clustered structure was observed when the lane was destroyed by considerably increasing the desired velocity. A strong system size effect was demonstrated by the relationship between the temporal and spatial scales of the lane structure. This system size effect can be attributed to an analogy with the driven lattice gas. The transport efficiency was characterized from the scaling relation in terms of the degree of lane formation and the interface thickness between different lanes.

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Section: Introductionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Lane Formation Dynamics of Oppositely Self-Driven Binary Particles: Effects of Density and Finite System Size

Ikeda

Kim

2017

J. Phys. Soc. Jpn.

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“…Such systems have been experimentally realized using certain types of colloidal particles [9][10][11] or dusty plasmas 12,13 , and have been used as a model for motion in social systems ranging from pedestrian flow 2,14 to insect movement 15 . A variety of non-laning states can appear in these systems, including jammed states where the particles block each other's motion [16][17][18][19] , pattern forming states [19][20][21][22][23][24][25] , and fully phase separated states [17][18][19] . The laning transition has many similarities to the phase separating patterns observed in related driven binary systems, indicating that formation of such patterns is a general phenomenon occurring in many nonequilibrium systems [26][27][28][29] .…”

Section: Introductionmentioning

confidence: 99%

Laning and clustering transitions in driven binary active matter systems

2018

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It is well known that a binary system of nonactive disks that experience driving in opposite directions exhibits jammed, phase separated, disordered, and laning states. In active matter systems, such as a crowd of pedestrians, driving in opposite directions is common and relevant, especially in conditions which are characterized by high pedestrian density and emergency. In such cases, the transition from laning to disordered states may be associated with the onset of a panic state. We simulate a laning system containing active disks that obey run-and-tumble dynamics, and we measure the drift mobility and structure as a function of run length, disk density, and drift force. The activity of each disk can be quantified based on the correlation timescale of the velocity vector. We find that in some cases, increasing the activity can increase the system mobility by breaking up jammed configurations; however, an activity level that is too high can reduce the mobility by increasing the probability of disk-disk collisions. In the laning state, the increase of activity induces a sharp transition to a disordered strongly fluctuating state with reduced mobility. We identify a novel drive-induced clustered laning state that remains stable even at densities below the activity-induced clustering transition of the undriven system. We map out the dynamic phase diagrams highlighting transitions between the different phases as a function of activity, drive, and density.

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“… 28 Related theoretical studies have considered driven colloidal particles in channels and in spatially periodic fields. 29 − 31 …”

mentioning

confidence: 99%

Phase Transitions of Oppositely Charged Colloidal Particles Driven by Alternating Current Electric Field

Wang

Shi

et al. 2021

ACS Nano

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We study systems containing oppositely charged colloidal particles under applied alternating current electric fields (AC fields) using overdamped Langevin dynamics simulations in three dimensions. We obtain jammed bands perpendicular to the field direction under intermediate frequencies and lanes parallel with the field under low frequencies. These structures also depend upon the particle charges. The pathway for generating jammed bands follows a stepwise mechanism, and intermediate bands are observed during lane formation in some systems. We investigate the component of the pressure tensors in the direction parallel to the field and observe that the jammed to lane transition occurs at a critical value for this pressure. We also find that the stable steady states appear to satisfy the principle of maximum entropy production. Our results may help to improve the understand of the underlying mechanisms for these types of dynamic phase transitions and the subsequent cooperative assemblies of colloidal particles under such non-equilibrium conditions.

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Segregation of oppositely driven colloidal particles in hard-walled channels: A finite-size study

Cited by 10 publications

References 28 publications

Lane Formation Dynamics of Oppositely Self-Driven Binary Particles: Effects of Density and Finite System Size

Lane Formation Dynamics of Oppositely Self-Driven Binary Particles: Effects of Density and Finite System Size

Laning and clustering transitions in driven binary active matter systems

Phase Transitions of Oppositely Charged Colloidal Particles Driven by Alternating Current Electric Field

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