Boundary flow of water on supported phospholipid filmsB. Cross, A. Steinberger, C. Cottin-Bizonne, J.-P. Rieu and E. Charlaix
Laboratoire de Physique de la Matière Condensée et Nanostructures Université Claude Bernard Lyon 1 et CNRS, UMR 5586 - F-69622 Villeurbanne, France
received 20 September 2005; accepted 9 December 2005
published online 4 January 2006
We report an investigation of the boundary flow of water on DPPC monolayers and bilayers deposited on Pyrex surfaces, using a dynamic surface force apparatus. We find that a no-slip boundary condition is verified at the water/bilayer interface within . In contrast, the interfacial flow properties on monolayers evolve with the time of exposure to water. A significant slip of is found on fresh monolayers, which are strongly hydrophobic. The hydrodynamic interaction force with a nearby surface is then significantly reduced over hundreds of nanometers. This slip effect disappears after one day of exposure to water, due to the increased hydrophilicity and roughness of hydrated monolayers.
68.08.-p - Liquid-solid interfaces.
68.47.Pe - Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces.
83.50.Rp - Wall slip and apparent slip.
© EDP Sciences 2006