Unjamming of active rotators

Ravazzano, Linda; Bonfanti, Silvia; Lionetti, Maria Chiara; Guerra, Roberto; Chepizhko, Oleksandr; Porta, Caterina A. M. La; Zapperi, Stefano

doi:10.1039/d0sm00440e

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…An interesting biological example is provided by Chlamydomonas reinhardtii (C. reinhardtii). This micron-sized unicellular algae is able to self-propel to perform translational motion, but also has the ability to self-rotate [ 56 ]. Rotation is used to sense the direction of light to optimize efficiency of phototaxis [ 57 ].…”

Section: Discussionmentioning

confidence: 99%

Deformable active nematic particles and emerging edge currents in circular confinements

Krause

Voigt

2022

Eur. Phys. J. E

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We consider a microscopic field theoretical approach for interacting active nematic particles. With only steric interactions the self-propulsion strength in such systems can lead to different collective behaviour, e.g. synchronized self-spinning and collective translation. The different behaviour results from the delicate interplay between internal nematic structure, particle shape deformation and particle–particle interaction. For intermediate active strength an asymmetric particle shape emerges and leads to chirality and self-spinning crystals. For larger active strength the shape is symmetric and translational collective motion emerges. Within circular confinements, depending on the packing fraction, the self-spinning regime either stabilizes positional and orientational order or can lead to edge currents and global rotation which destroys the synchronized self-spinning crystalline structure. Graphical abstract

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Section: Discussionmentioning

confidence: 99%

Deformable active nematic particles and emerging edge currents in circular confinements

Krause

Voigt

2022

Eur. Phys. J. E

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“…An interesting biological example is provided by Chlamydomonas reinhardtii (C. reinhardtii). This micron-sized unicellular algae is able to self-propel to perform translational motion, but also has the ability to self-rotate [55]. Rotation is used to sense the direction of light to optimize efficiency of phototaxis [56].…”

Section: Discussionmentioning

confidence: 99%

Deformable active nematic particles and emerging edge currents in circular confinements

Krause¹,

Voigt²

2021

Preprint

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We consider a microscopic field theoretical approach for interacting active nematic particles. With only steric interactions the self-propulsion strength in such systems can lead to different collective behaviour, e.g., synchronized self-spinning and collective translation. The different behaviour results from the delicate interplay between internal nematic structure, particle shape deformation and particle-particle interaction. For intermediate active strength an asymmetric shape emerges and leads to chirality and self-spinning crystals. For larger active strength the shape is symmetric and translational collective motion emerges. Within circular confinements, depending on the packing fraction, the self-spinning regime either stabilizes positional and orientational order or can lead to edge currents and global rotation which destroys the synchronized self-spinning crystalline structure.

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“…In recent years, much effort has been devoted to investigating the motility of microorganisms, driven, e.g., by flagellae and to the realisation of synthetic active matter by means of diffusophoretic [1], thermophoretic [2], field driven [3] and vibrated particles [4]. These active particles exhibit fascinating collective phenomena not found in passive systems, such as flock formation [3,5], dynamical clustering and phase separation [6][7][8], anomalous density fluctuations [9], vortices [10] activitydependent phase behaviour [11,12] and novel dynamical transitions [13]. While many experiments have focused on self-propelled spherical colloids, e.g.…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Interactions of Quincke Roller Clusters: from Orbits and Flips to Excited States

Mauleon-Amieva¹,

Allen²,

Royall³

2021

Preprint

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Active matter systems may be characterised by the conversion of energy into active motion, e.g. the self-propulsion of microorganisms. Artificial active colloids form models which exhibit essential properties of more complex biological systems but are amenable to laboratory experiments. While most experimental models consist of spheres, such as Janus particles, active particles of different shapes are less understood. In particular, interactions between such active colloidal "molecules" are largely unexplored. Here, we investigate the motion of active colloidal molecules and the interactions between them. We focus on self-assembled dumbbells and trimers powered by an external electric field. For dumbbells, we observe an activity-dependent behavior of spinning, circular and orbital motion. Moreover, collisions between dumbbells lead to the hierarchical self-assembly of tetramers and hexamers, both of which form rotational excited states. On the other hand, trimers exhibit a novel type of flipping motion that leads to trajectories reminiscent of a honeycomb lattice.

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Unjamming of active rotators

Abstract: Active particle assemblies can exhibit a wide range of interesting dynamical phases depending on internal parameters such as density, adhesion strength or self-propulsion.

Cited by 4 publications

References 38 publications

Deformable active nematic particles and emerging edge currents in circular confinements

Deformable active nematic particles and emerging edge currents in circular confinements

Deformable active nematic particles and emerging edge currents in circular confinements

Dynamics and Interactions of Quincke Roller Clusters: from Orbits and Flips to Excited States

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