Dresden 2009 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: POSTERS Micro- and Nanofluidics

CPP 38.6: Poster

Thursday, March 26, 2009, 17:00–19:30, P3

Roughness affects slippage and slippage affects hydrodynamic instabilities — •Ludovic Marquant, Matthias Lessel, Oliver Bäumchen, Julia Mainka, Frank Müller, and Karin Jacobs — Saarland University, Experimental Physics, D-66041 Saarbrücken

Dewetting experiments have proven to be ideally suited to probe the flow dynamics of liquids on solids. Here we focus on the boundary condition at the solid/liquid interface. Under certain conditions, the details of which we will present, the liquid can slip over the solid, leading to higher flow velocities and less drag. In our study we prepare polystyrene films below the entanglement length on top of hydrophobized substrates. The surface functionalization is done by preparing self-assembled monolayers of dodecyl- (DTS) or octadecyl-trichlorosilane (OTS) or by spin casting a thin AF1600 film.

We show that i) roughness affects slippage and that ii) hydrodynamic instabilities similar to the Rayleigh-Plateau instability, are influenced by slippage.