Dynamics of anchored oscillating nanomenisci

Caroline Mortagne (1) , Kevin Lippera (1) , Philippe Tordjeman (2) , Michael Benzaquen (3) , Thierry Ondarçuhu (1)

1 CEMES - Centre d'élaboration de matériaux et d'études structurales
2 IMFT - Institut de mécanique des fluides de Toulouse
3 LadHyX - Laboratoire d'hydrodynamique

We present a self-contained study of the dynamics of oscillating nanomenisci anchored on nanometric topographical defects around a cylindrical nanofiber with a radius below 100 nm. Using frequency-modulation atomic force microscopy (FM-AFM), we show that the friction coefficient surges as the contact angle is decreased. We propose a theoretical model within the lubrification approximation that reproduces the experimental data and provides a comprehensive description of the dynamics of the nanomeniscus. The dissipation pattern in the vicinity of the contact line and the anchoring properties are discussed as a function of liquid and surface properties in addition to the forcing conditions.

Mots clés: wetting; atomic force microscopy; Nanhydrodynamics

Domaines: Dynamique des Fluides [physics.flu-dyn]

Caroline Mortagne, Kevin Lippera, Philippe Tordjeman, Michael Benzaquen, Thierry Ondarçuhu. Dynamics of anchored oscillating nanomenisci. Physical Review Fluids, 2017, 2 (10), pp.102201. ⟨10.1103/PhysRevFluids.2.102201⟩. ⟨hal-01754876⟩