Phys. Rev. E 71, 035303(R) (2005) [4 pages]Direct measurement of the apparent slip length
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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.71.035303
DOI:
10.1103/PhysRevE.71.035303
PACS:
47.10.+g, 47.60.+i, 83.50.Ha, 83.50.Rp
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