Dresden 2020 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 3: Biopolymers, Biomaterials and Bioinspired Functional Materials (joint session CPP/BP)

BP 3.6: Vortrag

Montag, 16. März 2020, 10:45–11:00, ZEU 114

Wrinkling instability in 3D active nematics — Tobias Struebing¹, Amir Khosravanizadeh², Andrej Vilfan¹, Eberhard Bodenschatz¹, Ramin Golestanian¹, and •Isabella Guido¹ — ¹Max Planck Institute for Dynamics and Self-Organization, Goettigen, Germany — ²Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran

Networks of biopolymers and motor proteins are useful model systems for the understanding of emergent behaviour of active matter. An interesting class of such systems comprises active nematics, fluids constituted by self-organising elongated particles that in-vitro assemble in dynamical structures at length scales larger than those of their components by several orders of magnitude. In the last years the active nematic behaviour of biopolymer-motor networks confined on a 2D substrate was reported. Here we present an experimental and theoretical study on 3D active nematics made of microtubules, kinesin-1 motor proteins and a depleting agent. The network is subjected to the force exerted by the motors that crosslinked the filaments and let them slide against each other. In this way the system evolves toward a flattened and contracted 2D sheet that undergoes a wrinkling instability and subsequently loses order and transitions into a 3D active turbulent state. We observe that the wrinkle wavelength is independent of the ATP concentration and our theoretical model describes its relation with the appearance time. The experimental results are compared with a numerical simulation that confirms the key role of kinesin motors in the contraction and extension of the network.