title: Nanorheology: An investigation of the boundary condition at hydrophobic and hydrophilic interfaces.
abstract: It has been shown that the flow of a simple liquid over a solid surface can violate the so-called no-slip boundary condition. We investigate the flow of polar liquids, water and glycerol, on a hydrophilic Pyrex surface and a hydrophobic surface made of a Self-Assembled Monolayer of OTS (octadecyltrichlorosilane) on Pyrex. We use a Dynamic Surface Force Apparatus (DSFA) which allows one to study the flow of a liquid film confined between two surfaces with a nanometer resolution. No-slip boundary conditions are found for both fluids on hydrophilic surfaces only. Significant slip is found on the hydrophobic surfaces, with a typical length of one hundred nanometers.
authors.affiliation: Département de Physique des Matériaux (UMR 5586), Université Lyon I, 43 bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France. ccottin@dpm.univ-lyon1.fr
authors.forename: C
authors.initials: C
authors.lastname: Cottin-Bizonne
authors.forename: S
authors.initials: S
authors.lastname: Jurine
authors.forename: J
authors.initials: J
authors.lastname: Baudry
authors.forename: J
authors.initials: J
authors.lastname: Crassous
authors.forename: F
authors.initials: F
authors.lastname: Restagno
authors.forename: E
authors.initials: E
authors.lastname: Charlaix