Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid-liquid interfaces; Scanning probe and other methods; Electronic structure theory; Spin-orbit interaction)
O 58.2: Poster
Mittwoch, 13. März 2013, 18:15–21:45, Poster B1
Friction force microscopy on activated silicon surface — •Johanna Blass1, Florian Hausen1,2, Matthias Lessel2, Peter Loskill2, Marcel Albrecht3, Nitya Nand Gosvami1, Gerhard Wenz3, Karin Jacobs2, and Roland Bennewitz1,2 — 1INM - Leibniz-Institute for New Materials Campus D2 2, 66123 Saarbrücken, Germany — 2Department of Experimental Physics, Saarland University, D-66041Saarbrücken, Germany — 3Organic Macromolecular Chemistry Campus C4 2, Saarland University, D-66123 Saarbrücken, Germany
Surfaces with defined friction and adhesion properties are often required for technical applications such as strong mechanical links with high shearing but low peeling resistance. Therefore, we currently develop a novel surface material based on cyclodextrin assemblies with controlled anisotropy friction and adhesion characteristics. The interaction of two surfaces is based on host-guest interactions which are investigated by single molecule force spectroscopy and high resolution friction force microscopy. Immobilization results of cyclodextrin assemblies on activated silicon and gold are presented. Additionally, FFM experiments are presented which reveal an influence of the subsurface on an activated silicon surface. We found that friction forces on octadecyltrichlorosilane (OTS) self assembled monolayers as well as on siliconoxide decrease with a thicker oxide layer. The effect is attributed to a change in the van der Waals part of the effective interaction potential [1]. [1] P. Loskill, H. Hähl, T. Faidt, S. Grandthyll, F. Müller, and K. Jacobs, Adv. Coll. Interf. Sci. 107 (2012) 179182