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O: Fachverband Oberflächenphysik

O 6: Tribology

O 6.1: Hauptvortrag

Montag, 7. März 2016, 12:00–12:30, S053

The surface science of friction: How molecular films affect sliding and plowing — •Roland Bennewitz — INM - Leibniz Institute for New Materials, Saarbrücken, Germany

Two key mechanisms of friction are sliding and plowing. In sliding, adhesive forces between the contacting surfaces lead to friction, in plowing the plastic deformation of the surface. We have studied the role of the molecular structure at the interface in sliding and plowing by friction force microscopy. Results will be presented for plowing friction in a platinum crystal covered by a graphene layer [1]. Adhesive sliding friction can be controlled by macromolecular functionalization of the surfaces [2]. Finally, we will discuss the dynamic shear properties of liquids which exhibit a molecular layering when confined in the sliding contact [3].

[1] Klemenz, A., et al., Atomic Scale Mechanisms of Friction Reduction and Wear Protection by Graphene. Nano Letters, 2014, 14, 7145-7152.

[2] Blass, J., et al., Dynamic effects in friction and adhesion through cooperative rupture and formation of supramolecular bonds. Nanoscale, 2015, 7, 7674-7681.

[3] Krass, M.-D., et al., Dynamic shear force microscopy of nanometer-confined hexadecane layers. J. Phys.: Condens. Matter, 2016.