SKM 2023 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 1: Membranes, Vesicles, Synthetic Cells

BP 1.12: Vortrag

Montag, 27. März 2023, 12:45–13:00, BAR Schö

Active and driven colloids interacting with vesicles — •Antonio Stocco, Vaibhav Sharma, Florent Fessler, and Carlos Marques — Institut Charles Sadron, CNRS University of Strasbourg

When a colloid is close to a lipid giant vesicle, the interaction between the Brownian particle and the fluctuating soft membrane affects not only the particle motion but also the membrane properties. The membrane may change its shape to accommodate the particle and partial or complete engulfment may occur as a function of the energy of adhesion, membrane tension and bending. Furthermore, the interaction between a micrometric solid particle and a giant vesicle membrane may lead to complex dynamics when the system is driven out of equilibrium. Here, we report our efforts with self-propelled Janus colloids and with bare colloids under optical trapping to mimic complex dynamics such as particle endocytosis, the motion of a self-propelled particle confined to a spherical membrane, or the physics of particle engulfment by a membrane. In a wide range of experimental conditions, we have observed that a self-propelled Janus colloid is able to perform orbital motion around a giant vesicle remaining in a non-engulfment state. Still, the active particle is able to impart a force of the order of 0.01 pN on the vesicle, which is however too small to trigger particle engulfment. By applying external forces in the 1-100 pN range, we were able to observe engulfment of bare and Janus colloids by a giant vesicle.