Portal de Periódicos da CAPES

Hydrodynamic Force Measurements: Boundary Slip of Water on Hydrophilic Surfaces and Electrokinetic Effects

2002; American Physical Society; Volume: 88; Issue: 7 Linguagem: Inglês

10.1103/physrevlett.88.076103

1092-0145

Elmar Bonaccurso, Michael Kappl, Hans‐Jürgen Butt,

Electrohydrodynamics and Fluid Dynamics

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.