Sprecher
Beschreibung
The evaporation of a water droplet on a solid surface is ubiquitous in both natural and industrial settings. However, the mechanism by which evaporating droplets deposit charges on the interface, driven by the movement of the three-phase contact line, remains poorly understood. In this study, we investigate the nanoscale charge deposition of evaporating droplets and subsequent charge decay dynamics using Kelvin Probe Atomic Force Microscopy. Our findings reveal that the charge deposition patterns by evaporating droplets differ significantly depending on the surface chemistry of the substrate. Understanding how long and how effectively the charges generated at the solid/liquid interface persist is crucial, as many physicochemical phenomena are influenced by these charges.