Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 47: Wetting, Droplets, and Microfluidics (joint session DY/CPP)
CPP 47.8: Vortrag
Donnerstag, 21. März 2024, 17:00–17:15, BH-N 334
Rolle of water accumulation in dynamic friction on hydrophobic surfaces — •Igor Stanković1, Pierre-Emmanuel Mazeran2, and Olivier Noel3 — 1Scientific Computing Laboratory, Center for the Study of Complex Systems, Institute of Physics Belgrade, University of Belgrade, 11080 Belgrade, Serbia — 2Sorbonne Universites, Universite de Technologie de Compiegne, Laboratoire Roberval, FRE UTC-CNRS 2012, CS 60319, 60203, Compiegne, France — 3IMMM, UMR CNRS 6283, Le Mans Universite, Avenue O. Messiaen, 72085 Cedex 09, Le Mans, France
The nature of dynamic friction on water molecule-contaminated surfaces is still poorly understood. The capillary phenomena in tribological contact with graphite, a commonly used material, were investigated using circular mode atomic force microscopy and molecular dynamics simulations. Here, we demonstrate that an intuitive paradigm, which asserts that water molecules are squeezed out of hydrophobic contacts, needs to be refined. Consequently, we introduce a mechanism considering a droplet produced within the sliding nanocontact by the accumulation of water adsorbed on the substrate. Our results show that a full slip regime of the droplet sliding on the hydrophobic substrate explains the experimental tribological behaviour.
References 1. O.Noel, P.-E. Mazeran, I.Stanković, ACS Nano 16, 10768-10774 (2022).
Keywords: dynamic friction; water; circular AFM, molecular dynamics; hydrophobic surfaces