Regensburg 2022 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Wetting, Fluidics and Liquids at Interfaces and Surfaces

CPP 7.1: Vortrag

Montag, 5. September 2022, 10:45–11:00, H39

Coupling of liquid-liquid phase separation and wetting dynamics — •Youchuang Chao, Olinka Ramírez-Soto, Christian Bahr, and Stefan Karpitschka — Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany

The interplay of phase separation and surface wetting is of great interest for various fields, ranging from industrial applications of oil recovery to the formation of membraneless organelles in living cells. Most of previous studies focus on understanding the interaction of phase separation with static wetting, i.e., pinned contact line conditions; nevertheless, how phase separation interacts with dynamical wetting, for instance, advancing contact lines is still unclear. Here, using highly mobile, Marangoni-contracted droplets of evaporating, binary liquid mixtures with a well-defined miscibility gap on fully wetting substrates, we explore the interplay of phase separation and wetting dynamics. Interestingly, we observe an abrupt wetting transition: from a contracted droplet state in the one-phase region to an actively driven spreading motion in the two-phase region; This is caused by the strong coupling of liquid-liquid phase separation and advancing contact lines, together with effects of evaporative enrichment and surface forces. Our finding may enable the development of novel surface processing strategies.