Nanohydrodynamique près d’une surface solide : caractérisation expérimentale à l’équilibre

Nanohydrodynamics at liquid-solid interfaces : experimental characterization without external forcing

¹ Laboratoire de Physique de la Matière Condensée et Nanostructures Université de Lyon, F-69000, France ; Univ. Lyon 1
² Laboratoire PMCN ; CNRS, UMR 5586 ; F-69622 Villeurbanne Cedex

Auteur de correspondance : laurent.joly@univ-lyon1.fr

Résumé

We report on a new method to characterize the hydrodynamic boundary condition (HBC) relying solely on the measurement of the thermal motion of confined colloids, using a home build fluorescence correlation spectroscopy (FCS) setup. With this method, we show that, for smooth surfaces, the HBC depends on the wetting properties of the wall : while the no-slip assumption is fulfilled on hydrophilic surfaces, a finite slippage is measured on hydrophobic surfaces, with a characteristic slip length of 18 ± 5 nm.