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Article Dans Une Revue Physical Review Letters Année : 2020

Surface Tensions between Active Fluids and Solid Interfaces: Bare vs Dressed

Ruben Zakine
Yongfeng Zhao
Miloš Knežević
Adrian Daerr
Yariv Kafri
Julien Tailleur
Frédéric van Wijland

Résumé

We analyze the surface tension exerted at the interface between an active fluid and a solid boundary in terms of tangential forces. Focusing on active systems known to possess an equation of state for the pressure, we show that interfacial forces are of a more complex nature. Using a number of macroscopic setups, we show that the surface tension is a combination of an equation-of-state abiding part and of setup-dependent contributions. The latter arise from generic setup-dependent steady currents which "dress" the measurement of the "bare" surface tension. The former shares interesting properties with its equilibrium counterpart, and can be used to generalize the Young-Laplace law to active systems. We finally show how a suitably designed probe can directly access this bare surface tensions, which can also be computed using a generalized Virial formula.

Dates et versions

hal-03366485 , version 1 (05-10-2021)

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Citer

Ruben Zakine, Yongfeng Zhao, Miloš Knežević, Adrian Daerr, Yariv Kafri, et al.. Surface Tensions between Active Fluids and Solid Interfaces: Bare vs Dressed. Physical Review Letters, 2020, 124 (24), ⟨10.1103/PhysRevLett.124.248003⟩. ⟨hal-03366485⟩
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