Article Dans Une Revue Physical Review Letters Année : 2020

Lamellar to Micellar Phases and Beyond: When Tactic Active Systems Admit Free Energy Functionals

Résumé

We consider microscopic models of active particles whose velocities, rotational diffusivities, and tumbling rates depend on the gradient of a local field, which is either externally imposed or depends on all particle positions. Despite the fundamental differences between active and passive dynamics at the microscopic scale, we show that a large class of such tactic active systems admit fluctuating hydrodynamics equivalent to those of interacting Brownian colloids in equilibrium. We exploit this mapping to show how taxis may lead to the lamellar and micellar phases observed for soft repulsive colloids. In the context of chemotaxis, we show how the competition between chemoattractant and chemorepellent may lead to a bona-fide equilibrium liquid-gas phase separation in which a loss of thermodynamic stability of the fluid signals the onset of a chemotactic collapse.

Dates et versions

hal-03366464 , version 1 (05-10-2021)

Identifiants

Citer

Jérémy O'Byrne, Julien Tailleur, J. O’byrne. Lamellar to Micellar Phases and Beyond: When Tactic Active Systems Admit Free Energy Functionals. Physical Review Letters, 2020, 125 (20), ⟨10.1103/PhysRevLett.125.208003⟩. ⟨hal-03366464⟩
53 Consultations
0 Téléchargements

Altmetric

Partager

  • More