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Arrested-motility states in populations of shape-anisotropic active Janus particles.
Katuri, Jaideep; Poehnl, Ruben; Sokolov, Andrey; Uspal, William; Snezhko, Alexey.
Afiliação
  • Katuri J; Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL 60439, USA.
  • Poehnl R; Department of Mechanical Engineering, University of Hawai'i at Manoa, 2540 Dole Street, Holmes Hall 302, Honolulu, HI 96822, USA.
  • Sokolov A; Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL 60439, USA.
  • Uspal W; Department of Mechanical Engineering, University of Hawai'i at Manoa, 2540 Dole Street, Holmes Hall 302, Honolulu, HI 96822, USA.
  • Snezhko A; Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL 60439, USA.
Sci Adv ; 8(26): eabo3604, 2022 Jul.
Article em En | MEDLINE | ID: mdl-35776793
The emergence of large-scale collective phenomena from simple interactions between individual units is a hallmark of active matter systems. Active colloids with alignment-dominated interparticle interactions tend to develop orientational order and form motile coherent states, such as flocks and swarms. Alternatively, a combination of self-propulsion and excluded-volume interactions results in self-trapping and active phase separation into dense clusters. Here, we reveal unconventional arrested-motility states in ensembles of active discoidal particles powered by induced-charge electrophoresis. Combining experiments and computational modeling, we demonstrate that the shape asymmetry of the particles promotes the hydrodynamically assisted formation of active particles' bound states in a certain range of excitation parameters, ultimately leading to a spontaneous collective state with arrested motility. Unlike the jammed clusters obtained through self-trapping, the arrested-motility phase remains sparse, dynamic, and reconfigurable. The demonstrated mechanism of phase separation seeded by bound state formation in ensembles of oblate active particles is generic and should be applicable to other active colloidal systems.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article