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BP: Fachverband Biologische Physik

BP 1: Membranes, Vesicles, Synthetic Cells

BP 1.10: Talk

Monday, March 27, 2023, 12:15–12:30, BAR Schö

Lipid movement in monolayers at the air/water interface: hydrodynamic coupling to the subphase — Florian Gellert, Heiko Ahrens, and •Christiane A. Helm — Institute of Physics, University of Greifswald, Germany

Domain nucleation and growth in the liquid expanded/liquid condensed (LE/LC) phase transition in erucic acid monolayers at the air/water interface is studied. Dendritic domains are observed at high compression speeds and seaweed domains at low compression speeds. The different domain types are distinguished by fractal dimension, tip width, and the spacing of the side arms. A local, normalized supersaturation describes the hydrodynamic coupling of lipids in the LE phase moving towards the domain border to subphase movement. The coupling differs for the growth regimes. Additionally, the shape and symmetry of the domains are affected by barrier movement. The downstream side of the domains grows faster than the upstream side, as shown by directionality diagrams and FFTs. We suggest that the flow direction disturbs the diffusion direction of the lipids within the LE phase but not the coupling to the subphase.