We report here experiments wilh a Dynamic Surface Force Apparatus (DSFA) to investigale the flow boundary condition of glycerol at a solid surface. We use hydrophilic Pyrex surfaces and hydrophobic surfaces made of a Self-Assembled Monolayer of OTS (octadecyltrichlorosilane) on Pyrex. The DSFA allows us to study the flow of a liquid film confined between two surfaces with a nanometer resolution. No-slip boundary conditions are found for glycerol on hydrophilic surfaces only. Significanl slip is found on the hydrophobic surfaces, with a typical length of one hundred nanometers.
La Houille Blanche
Volume 89, 2003 - Issue 5
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