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DY: Fachverband Dynamik und Statistische Physik

DY 52: Focus Session: Wetting on Adaptive Substrates III (joint session CPP/DY/O)

DY 52.3: Vortrag

Freitag, 22. März 2024, 10:15–10:30, H 0110

High Voltages Generated by Moving Water Drops — •Stefan Weber^1,2, Pravash Bista², Aaron Ratschow³, and Hans-Jürgen Butt² — ¹Institute for Photovoltaics, University of Stuttgart — ²MPI for Polymer Research, Mainz — ³Institute for Nano- and Microfluidics, TU Darmstadt

Water drops on insulating, hydrophobic substrates can generate electric potentials of kilovolts upon sliding for a few centimeters. We show that the drop saturation voltage corresponds to an amplified value of the solid-liquid surface potential at the substrate. The amplification is given by the substrate geometry, the drop and substrate dielectric properties and the Debye length within the liquid. Next to enabling an easy and low-cost way to measure surface- and Zeta potentials, the high drop voltages have implications for energy harvesting, droplet microfluidics and electrostatic discharge protection.

Keywords: Dynamic Wetting; Droplets; Triboelectricity; Zeta potential