Unknown

Dataset Information

0

Flocking ferromagnetic colloids.


ABSTRACT: Assemblages of microscopic colloidal particles exhibit fascinating collective motion when energized by electric or magnetic fields. The behaviors range from coherent vortical motion to phase separation and dynamic self-assembly. Although colloidal systems are relatively simple, understanding their collective response, especially under out-of-equilibrium conditions, remains elusive. We report on the emergence of flocking and global rotation in the system of rolling ferromagnetic microparticles energized by a vertical alternating magnetic field. By combing experiments and discrete particle simulations, we have identified primary physical mechanisms, leading to the emergence of large-scale collective motion: spontaneous symmetry breaking of the clockwise/counterclockwise particle rotation, collisional alignment of particle velocities, and random particle reorientations due to shape imperfections. We have also shown that hydrodynamic interactions between the particles do not have a qualitative effect on the collective dynamics. Our findings shed light on the onset of spatial and temporal coherence in a large class of active systems, both synthetic (colloids, swarms of robots, and biopolymers) and living (suspensions of bacteria, cell colonies, and bird flocks).

SUBMITTER: Kaiser A 

PROVIDER: S-EPMC5310830 | biostudies-other | 2017 Feb

REPOSITORIES: biostudies-other

altmetric image

Publications

Flocking ferromagnetic colloids.

Kaiser Andreas A   Snezhko Alexey A   Aranson Igor S IS  

Science advances 20170215 2


Assemblages of microscopic colloidal particles exhibit fascinating collective motion when energized by electric or magnetic fields. The behaviors range from coherent vortical motion to phase separation and dynamic self-assembly. Although colloidal systems are relatively simple, understanding their collective response, especially under out-of-equilibrium conditions, remains elusive. We report on the emergence of flocking and global rotation in the system of rolling ferromagnetic microparticles en  ...[more]

Similar Datasets

| S-EPMC5035882 | biostudies-other
| S-EPMC4753254 | biostudies-literature
| S-EPMC5286210 | biostudies-literature
| S-EPMC8569212 | biostudies-literature
| S-EPMC5041146 | biostudies-literature
| S-EPMC4490366 | biostudies-literature
| S-EPMC5343437 | biostudies-literature
2012-06-17 | GSE33488 | GEO
| S-EPMC4055618 | biostudies-literature
| S-EPMC5283798 | biostudies-literature