Hydrodynamic boundary condition of water on hydrophobic surfaces
Schaeffel, David Schaeffel Yordanov, Stoyan Schmelzeisen, Marcus Yamamoto, Tetsuya Kappl, Michael Schmitz, Roman Dünweg, Burkhard Butt, Hans-Jürgen × Koynov, Kaloian #
Published by the American Physical Society through the American Institute of Physics
Physical Review E, Statistical, Nonlinear and Soft Matter Physics vol:87 issue:5 pages:0510011-0510014
By combining total internal reflection fluorescence cross-correlation spectroscopy with Brownian dynamics simulations, we were able to measure the hydrodynamic boundary condition of water flowing over a smooth solid surface with exceptional accuracy. We analyzed the flow of aqueous electrolytes over glass coated with a layer of poly(dimethylsiloxane) (advancing contact angle Θ = 108°) or perfluorosilane (Θ = 113°). Within an error of better than 10 nm the slip length was indistinguishable from zero on all surfaces.