Phys. Rev. Lett. 100, 214502 (2008) [4 pages]Velocity Profiles of Water Flowing Past Solid Glass Surfaces Using Fluorescent Nanoparticles and Molecules as Velocity ProbesReceived 27 July 2007; published 28 May 2008 Measurements of the velocity profile of water flowing on a glass surface using fluorescent nanoparticles and single fluorescent molecules as velocity probes show that the no slip boundary condition holds down to at least 10 nm from the surface. For water flowing on a hydrophobic solid surface, silanized glass, the no slip boundary condition fails, and a slip length of 45 nm is measured. These velocity measurements are complemented with atomic force microscopy measurements of dissipation on a small sphere oscillating near the surface with results in agreement with the velocity profiles. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.214502
DOI:
10.1103/PhysRevLett.100.214502
PACS:
47.15.−x, 47.15.G−, 68.08.−p
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