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

Scientific Reports
F BonelliA Tiribocchi

Abstract

We study numerically the behaviour of a two-dimensional 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.

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Citations

Sep 29, 2020·Scientific Reports·L N CarenzaA Tiribocchi
Jun 30, 2019·The European Physical Journal. E, Soft Matter·Livio Nicola CarenzaAdriano Tiribocchi
Oct 16, 2019·Proceedings of the National Academy of Sciences of the United States of America·Livio Nicola CarenzaGiuseppe Negro
Jul 22, 2020·Physical Review. E·Xiaolei YuanBaochang Shi
Nov 17, 2021·Soft Matter·Saraswat Bhattacharyya, Julia M Yeomans

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