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DY: Fachverband Dynamik und Statistische Physik

DY 36: Focus Session: Wetting on Adaptive Substrates I (joint session CPP/DY/O)

DY 36.4: Talk

Thursday, March 21, 2024, 10:30–10:45, H 0107

Percolation in Networks of Liquid Diodes — Camilla Sammartino, Yair Shokef, and •Bat-El Pinchasik — Tel Aviv University, School of Mechanical Engineering, Israel

Liquid diodes are surface structures that facilitate the spontaneous flow of liquids in a specific direction. In nature, they are used to increase water collection and uptake, reproduction, and feeding. However, pump-free large networks with directional properties are exceptional and are typically limited up to a few centimeters. Here, we simulate, design, and 3D print networks consisting of hundreds of liquid diodes. We provide structural and wettability guidelines for directional transport of liquids through these networks and introduce percolation theory in order to identify the threshold between a connected network, which allows fluid to reach specific points, and a disconnected network. By constructing well-defined networks with uni- and bidirectional pathways, we experimentally demonstrate the applicability of models describing isotropically directed percolation. We accurately predict the network permeability and the liquid final state. These guidelines are highly promising for the development of structures for spontaneous, yet predictable, directional liquid transport. In addition, they comprise an initial realization of complex liquid circuits, analogoues to electric circuits.

Keywords: Liquid Diodes; Wetting; Directional transport; Liquid solid interactions; Percolation