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O: Oberflächenphysik

O 46: Grenzfläche fest-flüssig

O 46.3: Vortrag

Freitag, 12. März 2004, 11:45–12:00, H45

Nanofluidics: Viscous Dissipation in Layered Liquid Films — •Thomas Becker and Frieder Mugele — Angewandte Physik, Universität Ulm, Albert Einstein Allee 11, 89081 Ulm

Using a temperature-controlled 2D-imaging Surface Forces Apparatus (SFA) we investigated the layer-by-layer collapse of molecularly thin films of a model liquid between two atomically smooth substrates as a function of temperature. The dynamics of the consecutive expulsion of four molecular layers were found to slow down with decreasing film thickness but showed no evidence for confinement introduced solidification. Using a new hydrodynamic model, we show that the sliding friction of the liquid layers on top of the solid substrates is approximately 35 times higher than the mutual friction between adjacent liquid layers. The latter was independent of film thickness and in close agreement with the bulk viscosity [1]. [1] T. Becker and F. Mugele, Phys. Rev. Lett. 91 , p. 166104/1-4 (2003)