Publié le 2 décembre 2024
–
Mis à jour le 2 décembre 2024
Date(s)
le 10 décembre 2024
14h00
Lieu(x)
Institut de Physique de Nice
Conference room 1+2
Conference room 1+2
The elusive surface tension of active fluids
Fluid seminars
Abstract:
Abstract:
Phase transitions and phase separations in active matter systems are now ubiquitous. Nonetheless, since relying on a free energy-based definition of surface tension is impossible in these systems, the stability of the interfaces is usually difficult to characterize. In this seminar, I will discuss various quantities that show some relevance to define a surface tension out of equilibrium. In particular, I will propose a purely mechanical definition of surface tension in assemblies of self-propelled particles. Notably, the probes we use in our simulations, inspired by the mechanical probes commonly used in the lab, enable one to measure the fluid-solid and the liquid-gas surface tensions, which paves the way of recovering an analogue of the Young-Dupré law for active liquid spreading.
