Lamellar ordering, droplet formation and phase inversion in exotic active emulsions

Abstract

We study numerically the behaviour of a mixture of a passive isotropic fluid and an active polar gel, in the presence of a surfactant favouring emulsification. Focussing on parameters for which the underlying free energy favours the lamellar phase in the passive limit, we show that the interplay between nonequilibrium and thermodynamic forces creates a range of multifarious exotic emulsions. When the active component is contractile (e.g., an actomyosin solution), moderate activity enhances the efficiency of lamellar ordering, whereas strong activity favours the creation of passive droplets within an active matrix. For extensile activity (occurring, e.g., in microtubule-motor suspensions), instead, we observe an emulsion of spontaneously rotating droplets of different size. By tuning the overall composition, we can create high internal phase emulsions, which undergo sudden phase inversion when activity is switched off. Therefore, we find that activity provides a single control parameter to design composite materials with a strikingly rich range of morphologies.

arXiv comment15 pages: Manuscprit (4 figures) and SI (11 figures)

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Cited by in corpus (16)

• Lattice Boltzmann Methods and Active Fluids
• Rotation and propulsion in 3d active chiral droplets
• Cascade or not cascade? Energy transfer and elastic effects in active nematics
• Multi-scale control of active emulsion dynamics
• Rheology of active polar emulsions: from linear to unidirectional and unviscid flow, and intermittent viscosity
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• Phase-field-based lattice Boltzmann model for immiscible incompressible N-phase flows
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• Motility and self propulsion of active droplets