Europhys. Lett.
Volume 73, Number 3, February 2006
Page(s) 390 - 395
Section Condensed matter: structural, mechanical and thermal properties
Published online 04 January 2006
Europhys. Lett., 73 (3), pp. 390-395 (2006)
DOI: 10.1209/epl/i2005-10416-4

Boundary flow of water on supported phospholipid films

B. 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 $2\un{nm}$. In contrast, the interfacial flow properties on monolayers evolve with the time of exposure to water. A significant slip of $10\un{nm}$ 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