Regensburg 2022 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 25: General Session to the Symposium: Interplay of Substrate Adaptivity and Wetting Dynamics from Soft Matter to Biology (joint session CPP/DY)
DY 25.6: Vortrag
Mittwoch, 7. September 2022, 10:45–11:00, H39
Spontaneous charging affects the motion of sliding drops — Xiaomei Li1, Pravash Bista1, Rüdiger Berger1, Steffen Hardt2, Holger Marschall3, Hans-Jürgen Butt1, and •Stefan A.L. Weber1,4 — 1MPI for Polymer Research, Ackermannweg 10, Mainz, Germany — 2Institute for Nano- and Microfluidics, Technische Universität Darmstadt, Darmstadt, Germany — 3Computational Multiphase Flows, Technische Universität Darmstadt, Darmstadt, Germany — 4Institute of Physics, Johannes Gutenberg University Mainz, Mainz, Germany
The motion of water drops on surfaces is still far from being fully understood. Previous understanding is that drop motion is dictated by viscous dissipation and activated dynamics at the contact line. To accurately measure the forces experienced by moving drops, we imaged their trajectory when sliding down a tilted surface, and applied the relevant equations of motion [1]. We found that drop motion on low-permittivity substrates is substantially influenced by electrostatic forces. Our findings confirm that electrostatics must be taken into consideration for the description of the motion of water, aqueous electrolytes and ethylene glycol on hydrophobic surfaces. Our results are relevant for improving the control of drop motion in many applications, including printing, microfluidics, water management and triboelectric nanogenerators. [1] Li, X. et al. Spontaneous charging affects the motion of sliding drops. Nat. Phys. (2022).