Direct measurement of the apparent slip length.

  title={Direct measurement of the apparent slip length.},
  author={Pierre Joseph and Patrick Tabeling},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={71 3 Pt 2A},
We measure velocity profiles in water flowing through thin microchannels, using particle image velocimetry combined with a nanopositioning system. From the velocity profiles, we determine the slip lengths in two cases: Smooth hydrophilic glass surfaces, and smooth hydrophobic glass surfaces, grafted with a monolayer of silane. The slip length is determined within (+/-100 nm) , i.e., five times more accurately than previous work. In all cases, we find that the slip length is below 100 nm. 

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