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Article Dans Une Revue Physical Review Letters Année : 2021

Capillary Interfacial Tension in Active Phase Separation

Résumé

In passive fluid-fluid phase separation, a single interfacial tension sets both the capillary fluctuations of the interface and the rate of Ostwald ripening. We show that these phenomena are governed by two different tensions in active systems, and compute the capillary tension sigma(cw) which sets the relaxation rate of interfacial fluctuations in accordance with capillary wave theory. We discover that strong enough activity can cause negative sigma(cw). In this regime, depending on the global composition, the system self-organizes, either into a microphase-separated state in which coalescence is highly inhibited, or into an "active foam" state. Our results are obtained for Active Model B+, a minimal continuum model which, although generic, admits significant analytical progress.

Dates et versions

cea-04344939 , version 1 (14-12-2023)

Identifiants

Citer

G. Fausti, E. Tjhung, M. E. Cates, C. Nardini. Capillary Interfacial Tension in Active Phase Separation. Physical Review Letters, 2021, 127 (6), pp.068001. ⟨10.1103/PhysRevLett.127.068001⟩. ⟨cea-04344939⟩
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