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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Active Matter II (joint session BP/CPP/DY)

CPP 20.10: Vortrag

Dienstag, 19. März 2024, 12:00–12:15, H 1028

Foams Come to Life — •Ivan Maryshev¹, Filippo De Luca^1,2, and Erwin Frey¹ — ¹Ludwig-Maximilians-Universität München, München, Germany; — ²University of Cambridge, Cambridge, United Kingdom

Recent experiments on active filament mixtures revealed a new non-equilibrium phase called active foam, consisting of a continuously reconfiguring network of bilayers [1]. The existence of similar structures was previously predicted in phenomenological models [2]. Here we introduce a microscopic model for microtubule-motor mixtures and rigorously derive a hydrodynamic theory that recapitulates the experimental observations. We explain the observed instabilities and associated mechanisms. Finally, we discuss various forms of foam that can be realized in different active matter systems and classify them according to the symmetry and order parameters involved. This research contributes to our understanding of the complex behavior exhibited by active foams and provides insights into their dynamics.

[1] B. Lemma, N. P. Mitchell, R. Subramanian, D. J. Needleman, and Z. Dogic (2022). Active microphase separation in mixtures of microtubules and tip-accumulating molecular motors. Phys. Rev. X 12(3), 031006.

[2] I. Maryshev, A. Morozov, B. Goryachev, and D. Marenduzzo (2020). Pattern formation in active model C with anchoring: bands, aster networks, and foams. Soft Matter 16(38), 8775-8781.

Keywords: cytoskeleton; microtubules; motors; foam