title: Hydrodynamic force measurements: boundary slip of water on hydrophilic surfaces and electrokinetic effects.
abstract: The hydrodynamic drainage force of aqueous medium between smooth hydrophilic surfaces was measured with the colloidal probe technique up to shear rates of typically 10(4) s(-1). Measured force curves were compared to simulations. To reach agreement between experimental and simulated force curves, the hydrodynamic force had to be fitted with a model allowing for boundary slippage. Boundary slip was characterized by a slip length of 8-9 nm. Force measurements with charged surfaces could be simulated taking only hydrodynamic and electrostatic double-layer forces into account.
authors.affiliation: Physikalische Chemie II, Universität Siegen, 57068 Siegen, Germany.
authors.forename: Elmar
authors.initials: E
authors.lastname: Bonaccurso
authors.forename: Michael
authors.initials: M
authors.lastname: Kappl
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Butt