Formation of spiral coils among self-propelled chains

Wang, Yao Kuan; Lo, Chien Jung; Lo, Wei Chang

doi:10.1103/physreve.98.062613

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…Our model is a dry quasi-two-dimensional system in which the hydrodynamic interaction is neglected [29]. The friction constant ζ = 3πbη follows Stokes' law, where b is the diameter of the bead (in our work it is exactly the diameter of the rods).…”

Section: Methodsmentioning

confidence: 99%

“…A constant propulsion force f is applied to each bead along the tangential direction towards the head bead, except for the head and the tail bead. For the head and tail beads, the propulsion force is instead applied along the bond vector with their neighboring bead [29]. The simulations were conducted with rods in an 2D area A and periodic boundary conditions.…”

Section: Methodsmentioning

confidence: 99%

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Rapid phase transition in 2D active pseudocrystals

Chen

2022

Preprint

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Active matter with continuous energy injection that exhibits various nonequilibrium emergent behaviors, such as swarming and motility induced phase separation, has been extensively studied in the past decades. Achieving desired patterns and phases in fabricating functional materials by assembling active matter is a rising and challenging direction. Nevertheless, the ossibility of a stably ordered structure of active matter remains elusive. Toward this goal, the interplay between the active force and the volume exclusion provides a new way to manipulate mechanical stability. Here, we demonstrate a new type of active, two dimensional (2D) pseudocrystal system consisting of arrays of active rods. The pseudocrystals with tetratic array demonstrate robust stability against the thermal noise. Increasing the active force leads to a phase transition from pseudocrystal to swarming via shear melting. In the traveling pseudocrystals, on the contrary, the synchronized movement of active rods reduces internal stresses and enhances the stability of pseudocrystals. Topological defects quickly propagate in the traveling pseudocrystals and assist the stability. The present framework provides innovative insights into potentially new designs and manipulations of active materials. PACS numbers:

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Rapid phase transition in 2D active pseudocrystals

Chen

2022

Preprint

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“…Self-propelled particles self-organize into macroscopic structures with collective dynamics like clustering, swarming, and swirling. This type of dynamical pattern formation has been subject to intensive research in recent years, both from a theoretical or computational viewpoint [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] and experimentally [26][27][28][29][30][31][32][33], often using systems of bacteria either swimming in a solution or gliding on surfaces as well as synthetic self-propelled particles systems [34].…”

Section: Introductionmentioning

confidence: 99%

Effects of direction reversals on patterns of active filaments

Abbaspour¹,

Malek²,

Karpitschka³

et al. 2021

Preprint

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Active matter systems provide fascinating examples of pattern formation and collective motility without counterpart in equilibrium systems. Here, we employ Brownian dynamics simulations to study the collective motion and self-organization in systems of self-propelled semiflexible filaments, inspired by the gliding motility of filamentous Cyanobacteria. Specifically, we investigate the influence of stochastic direction reversals on the patterns. We explore pattern formation and dynamics by modulating three relevant physical parameters, the bending stiffness, the activity, and the reversal rate. In the absence of reversals, our results show rich dynamical behavior including spiral formation and collective motion of aligned clusters of various sizes, depending on the bending stiffness and self-propulsion force. The presence of reversals diminishes spiral formation and reduces the sizes of clusters or suppresses clustering entirely. This homogenizing effect of direction reversals can be understood as reversals providing an additional mechanism to either unwind spirals or to resolve clusters.

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“…Self-propelled particles self-organize into macroscopic structures with collective dynamics like clustering, swarming, and swirling. This type of dynamical pattern formation has been subject to intensive research in recent years, both from a theoretical or computational viewpoint [39,[45][46][47][124][125][126][127][128][129][130][131][132][133][134] and experimentally [55,75,[135][136][137][138][139][140], often using systems of bacteria either swimming in a solution or gliding on surfaces as well as synthetic self-propelled particles systems [141].…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Self-organization of Crowded Active Systems

Abbaspour¹

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The perplexing and intriguing world of biological systems has inaugurated a new research field in statistical physics: out-of-equilibrium systems, known as active matter that mimic systems in the biological world around us from a statistical mechanical point of view. These systems exhibit captivating collective dynamics such as selfsustained pattern formation. Self-organization of motors and microtubules within the cell, swarming colonies of bacteria, and starling murmuration are some fascinating patterns in nature that organize themselves independently, without external control. Numerous computational, theoretical, and experimental models have been developed to unravel the physics of active matter system.In this thesis, we employ several agent-based minimal models to study self-propelled particles to explore the key parameters that play a significant role in their dynamics and self-organization.We develop a hexagonal lattice model to study the dynamics of passive "tracers" in the presence of active crowders where the tracer is pushed by the active particles, which leads to enhanced diffusion. We show that the degree to which this diffusion is enhanced depends crucially on the activity and the density of the crowders. Furthermore, we show that a decrease in the diffusion coefficient of passive particles is an explicit consequence of the local accumulation of active crowders in the system.

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Formation of spiral coils among self-propelled chains

Cited by 7 publications

References 30 publications

Rapid phase transition in 2D active pseudocrystals

Rapid phase transition in 2D active pseudocrystals

Effects of direction reversals on patterns of active filaments

Dynamics and Self-organization of Crowded Active Systems

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