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  • Title: Nanorheology: An investigation of the boundary condition at hydrophobic and hydrophilic interfaces.
    Author: Cottin-Bizonne C, Jurine S, Baudry J, Crassous J, Restagno F, Charlaix E.
    Journal: Eur Phys J E Soft Matter; 2002 Sep; 9(1):47-53. PubMed ID: 15010929.
    Abstract:
    It 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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