Dresden 2020 – scientific programme
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BP: Fachverband Biologische Physik
BP 12: Active Matter II (joint session BP/CPP/DY)
BP 12.2: Talk
Tuesday, March 17, 2020, 09:45–10:00, HÜL 386
Sculpting vesicles with active particles — Masoud Hoore1, Clara Abaurrea-Velasco1, Hanumantha Rao Vutukuri2, Thorsten Auth1, Jan Vermant2, Gerhard Gompper1, and •Dmitry Fedosov1 — 1Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Department of Materials, ETH Zürich, 8093 Zürich, Switzerland
Biological cells are able to generate intricate structures and respond to external stimuli, sculpting their membrane from inside. Simplified biomimetic systems can aid in understanding the principles which govern these shape changes and elucidate the response of the cell membrane under strong deformations. We employ a combined simulation and experimental approach to investigate different non-equilibrium shapes and active shape fluctuations of vesicles enclosing self-propelled particles. Interestingly, the most pronounced shape changes are observed at relatively low particle loadings, starting with the formation of tether-like protrusions to highly branched, dendritic structures. At high volume fractions, globally deformed vesicle shapes are observed. The obtained state diagram of vesicles sculpted by active particles predicts the conditions under which local internal forces can generate dramatic cell shape changes, such as branched structures in neurons.