Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 86: Focus Session: Wetting on Adaptive Substrates II (joint session CPP/DY/O)

O 86.5: Vortrag

Donnerstag, 21. März 2024, 12:45–13:00, H 0107

Dynamic vesicles on adaptive surfaces — •Lucia Wesenberg, Ben Rasmus Sprötge, Kai-Uwe Hollborn, and Marcus Müller — Institut für theoretische Physik, Georg-August-Universität Göttingen

Vesicles on substrates play a fundamental role in numerous biological transport processes, such as the neurotransmitter release at the synapse, transport vesicles in cells, or the nutrient intake of trees by large vesicles. For all of these processes the adaptive adhesion of the vesicles to a biological substrate is crucial. Furthermore, it is interesting to compare how these adaptive processes differ from wetting of liquid droplets as their shapes seem similar, however, one is governed by bending rigidity and the other by tension.

Here, we study the equilibrium shapes of vesicles as well as their dynamic adaptation to a changing substrate. Our simulations show the significant impact of buoyancy on the vesicle shape, especially in the contact zone. We are able to construct an adsorption diagram summarizing the metastable region of upward buoyant adsorbed vesicles. Further, we study permeable vesicles, adapting dynamically to substrates with a constant adhesion potential with periodically modulated strength or a steplike potential with a given velocity. A step in the potential allows the steering of vesicles, while periodic switching enables controlled vesicle substrate contact. Thus, both cases prove to be an effective control mechanism for biological transport of vesicles.

Keywords: vesicle; wetting; adaptive-substrate; adhesion; simulation