Effect of polydispersity on the dynamics of active Brownian particles

Kumar, Sameer; Singh, Jay Prakash; Giri, Debasis; Mishra, Sudhanshu

doi:10.1103/physreve.104.024601

Cited by 28 publications

(15 citation statements)

References 57 publications

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“…Another effective strategy that has been studied recently focuses on mixing different species of active particles to add more complexity to the system. Both the introduction of a second passive [18,19] or slow [20,21] particle type, or introducing polydispersity [22] widens the variety of phase behaviors in active disk systems. Inspired by the latest achievements in synthesizing active colloids [23,24], we study ABP systems where both particle shape and stoichiometry are varied.…”

Section: Introductionmentioning

confidence: 99%

Shape-driven, emergent behavior in active particle mixtures

2022

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Active particle systems can vary greatly from one-component systems of spheres to mixtures of particle shapes at different composition ratios. We investigate computationally the combined effect of anisotropy and stoichiometry on the collective behavior of two-dimensional active colloidal mixtures of polygons. We uncover three emergent phenomena not yet reported in active Brownian particle systems. First, we find that mixtures containing hexagons exhibit micro-phase separation with large grains of hexagonal symmetry. We quantify a measurable, implicit ``steric attraction'' between the active particles as a result of shape anisotropy and activity. This calculation provides further evidence that implicit interactions in active systems, even without explicit attraction, can lead to an effective preferential attraction between particles. Next, we report stable fluid clusters in mixtures containing one triangle or square component. We attribute the fluidization of the dense cluster to the interplay of cluster destabilizing particles, which introduce grain boundaries and slip planes into the system, causing solid-like clusters to break up into fluid clusters. Third, we show that fluid clusters can coexist with solid clusters within a sparse gas of particles in a steady state of three coexisting phases. Our results highlight the potential for a wide variety of behavior to be accessible to active matter systems and establish a route to control active colloidal system through simple parameter designs.

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Section: Introductionmentioning

confidence: 99%

Shape-driven, emergent behavior in active particle mixtures

2022

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“…Inhomogeneity or disorder can be crucial in the ordering of active objects; they can reduce the ordering as well as enhance the system dynamics according to their nature [26][27][28][29][30]. In [26,27], authors have found that the presence of obstacles reduces the ordering and also breaks the ordered phase if their density is high.…”

Section: Introductionmentioning

confidence: 99%

Active nematic gel with quenched disorder

Kumar¹,

Mishra²

2022

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With quenched disorder, we introduce two-dimensional active nematics suspended in an incompressible fluid. We write the coarse-grained hydrodynamic equations of motion for slow variables, viz. density, flow field, and orientation. The quenched disorder is introduced in the orientation field, which interacts with the local orientation at every point with some strength. Disorder strength is tuned from zero to large values. We numerically study the defect dynamics and system's kinetics and find that the finite disorder slows the ordering. The presence of fluid induces large fluctuation in the particles' orientation, which further disturbs the ordering. The large fluctuation in the orientation field due to the fluid suppresses the effect of the quenched disorder. We also have found that the disorder's effect is almost the same for both the contractile and extensile nature of active stress in the system.

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“…Each particle show systematic motion at the cost of its internal energy. All individuals in a group synchronize themselves to show different behaviorial state, exhibiting host of interesting properties like pattern formation [12], nonequilibrium phase transition [7], large density fluctuation [12][13][14][15][16], enhance dynamics [17][18][19][20][21][22][23][24][25][26], motility induced phase separation [27][28][29][30][31] etc,. Interestingly, different real biological systems are encountered with different kinds of confined geometry [32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Current reversal in polar flock at order-disorder interface

Singh¹,

Semwal²,

Mishra³

2022

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We studied a system of polar self-propelled particles (SPPs) on a thin rectangular channel designed into three regions of order-disorder-order. The division of the three region is made on the basis of the noise SPPs experiences in that region. The noise in the two wide region is chosen lower than the critical noise of order-disorder transition and noise in the middle region or interface is higher than the critical noise. This make the arrangement of the system analogous to the Josephson Junction (JJ) in solid state physics. Keeping all other parameters fixed, we study the properties of the moving flock in the bulk as well as along the interface for different width of the junction d. On increasing junction system shows a order-to-disorder transition from coherent moving SPPs in the whole system to the interrupted current for large interface width. Surprisingly, inside the interface we observed the current reversal for intermediate widths of the interface. Such current reversal is due to the large randomness present inside the interface, which makes the wall of the interface reflecting. The phenomena of current reversal in our present system is similar to current reversal observed in JJ system. Hence Our study give a new interesting collective properties of SPPs at the interface which can be useful to design devices like switch using active agents.

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Effect of polydispersity on the dynamics of active Brownian particles

Cited by 28 publications

References 57 publications

Shape-driven, emergent behavior in active particle mixtures

Shape-driven, emergent behavior in active particle mixtures

Active nematic gel with quenched disorder

Current reversal in polar flock at order-disorder interface

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