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DS: Fachverband Dünne Schichten

DS 31: Organic thin films I

DS 31.7: Vortrag

Donnerstag, 29. März 2012, 12:45–13:00, H 0111

Depletion of Water on Self-assembled-Monolayers — •Bastian Rückert, Hans-Georg Steinrück, Michael Klimczak, Stefan Gerth, and Andreas Magerl — Chair of Christallography and Structural Physics

Octadecyltrichlorosilane (C18H37Cl3Si, chain length 25 Å) selfassembled on the native oxide of a silicon wafer was chosen as a model system to investigate slip parameters and the influence of shear on hydrophobic surfaces. To gather insight on the structure of this monolayer, X-ray reflectivity (XRR) measurements were performed.

In contact to water a depletion layer of 3 Å with a reduced water density of 60% was observed at the solid-liquid interface. Further it is shown that this depletion zone is independent on shear.

To investigate the impact of the chain length to the monolayer thickness and the depletion layer as a function of the applied shear the chain length of the molecules were systematically varied up to Triacontyltrichlorosilane (C30H61Cl3Si, chain length 35 Å). Again a depletion layer had to be taken into account in order to describe the data.

Searching for any changes in the existing depletion layer or the layer system of Triacontyltrichlorosilane none were found. Even varying the shear rates neither of both showed changes in the interpreted data.