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Dryad

Dynamics of active liquid interfaces

Cite this dataset

Adkins, Raymond et al. (2022). Dynamics of active liquid interfaces [Dataset]. Dryad. https://doi.org/10.25349/D9JS6Q

Abstract

Controlling interfaces of phase separating fluid mixtures is key to creating diverse functional soft materials. Traditionally, this is accomplished with surface-modifying agents. Using a combination of experiment and theory, we study how mechanical activity shapes soft interfaces of a phase separating mixture of an active and a passive fluid. Chaotic flows in the active fluid give rise to giant interfacial fluctuations and non-inertial propagating active waves. At high activities, stresses disrupt interface continuity and drive droplet pinch- off. In this limit, we observe an active emulsion-like steady-state comprising finite-sized droplets that constantly break apart, fuse and exchange content. Furthermore, when in contact with a solid boundary, active interfaces exhibit non-equilibrium wetting transitions, where the fluid powered by active stress climbs the wall against gravity. These results demonstrate the promise of me- chanically driven interfaces for creating a new class of lifelike soft active mat- ter.

Funding

U.S. Department of Energy, Award: DE-SC0019733

National Science Foundation, Award: NSF-DMR-1720256

National Science Foundation, Award: NSF-DMR-2041459

National Science Foundation, Award: NSF-GRFP-1650114

National Science Foundation, Award: DMR-2011846

International Human Frontier Science Program Organization, Award: LT001065/2017- C