Nanorheology : an Investigation of the Boundary Condition at Hydrophobic and Hydrophilic Interfaces

Details Nanorheology : an Investigation of the Boundary Condition at Hydrophobic and Hydrophilic Interfaces Nanorheology : an Investigation of the Boundary Condition at Hydrophobic and Hydrophilic Interfaces

2002-10-08

arxiv.org/abs/cond-mat/0210154v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 7 figures, 2 tables. Accepted for European Physical Journal E - Sofr Mater

Scientific paper

10.1140/epje/i2001-10112-9

t has been shown that the flow of a simple liquid over a solid surface can violate the so-called no-slip boundary condition. We investigate the flow of polar liquids, water and glycerol, on a hydrophilic Pyrex surface and a hydrophobic surface made of a Self-Assembled Monolayer of OTS (octadecyltrichlorosilane) on Pyrex. We use a Dynamic Surface Force Apparatus (DSFA) which allows one to study the flow of a liquid film confined between two surfaces with a nanometer resolution. No-slip boundary conditions are found for both fluids on hydrophilic surfaces only. Significant slip is found on the hydrophobic surfaces, with a typical length of one hundred nanometers.

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