Regensburg 2022 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 17: Membranes and Vesicles

BP 17.4: Vortrag

Mittwoch, 7. September 2022, 15:45–16:00, H13

Seaweed and dendritic domains of erucic acid monolayers — •Florian Gellert, Heiko Ahrens, Harm Wulff, and Christiane A. Helm — Institute of Physics, University of Greifswald, Germany

Nucleation and growth of domains in the liquid expanded/liquid condensed phase transition in monolayers of erucic acid at the air/water interface is studied with a Brewster Angle Microscope. With increase of the compression speed of the monolayer, the growth mode of the domains changes from seaweed to dendritic. Seaweed domains have broad tips, and wide, variable side branch spacing. Dendritic domains have narrower tips, and small, well-defined side branch spacing and a larger fractal dimension. The domains have different growth mechanisms: seaweed domains grow by surface diffusion while dendrite domains grow by diffusion in the subphase (Marangoni effect). The hydrodynamic models of domain growth will be discussed.