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BP: Fachverband Biologische Physik

BP 16: Membranes, Vesicles and Synthetic Life-like Systems II

BP 16.10: Vortrag

Mittwoch, 11. März 2026, 12:15–12:30, BAR/0205

Active and Brownian Colloids interacting with Lipid Vesicles — •Antonio Stocco, Clément Marque, and Florent Fessler — Institut Charles Sadron, CNRS, Strasbourg, France

Motion of active and passive Brownian particles is strongly affected by confinement effects, which impact the persistence of the ballistic dynamics and can guide transitions and instabilities when dealing with deformable interfaces. Here, I will present some experimental results describing the dynamics of active and passive colloids interacting with soft fluctuating membranes. Our experimental systems are composed of Giant unilamellar vesicles (GUVs) with tunable membrane tension and bare or Janus self-propelled colloids showing different hydrodynamic and particle-membrane interactions. We were able to observe emerging dynamics such as autonomous particle engulfment by the vesicle membrane, hysteresis of the particle wrapping dynamics and membrane tension dependent particle drag [1,2,3]. References: [1] F Fessler, M Wittmann, J Simmchen, A Stocco. Dynamics of Active Colloid Engulfment by Giant Lipid Vesicles, Soft Matter 2024, 20, 5904. [2] F Fessler, P Muller, A Stocco, Energetics and dynamics of membrane necks in particle wrapping, Journal of Colloid and Interface Science 2025, 700, 138524 [3] C Marque, G d'Avino, D Larobina, A Michel, A Abou-Hassan, A Stocco Diffusion of a single colloid on the surface of a giant vesicle and a droplet Physical Review E2025, 111 (2), 025411

Keywords: Lipid membranes; Janus Colloids; self-propelled motion; Brownian motion; giant vesicles