The hydrodynamic drainage force of aqueous medium between smooth hydrophilic surfaces was measured with the colloidal probe technique up to shear rates of typically . 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 . Force measurements with charged surfaces could be simulated taking only hydrodynamic and electrostatic double-layer forces into account.
- Received 11 June 2001
©2002 American Physical Society