Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Tribology

O 31.3: Vortrag

Dienstag, 17. März 2015, 14:30–14:45, MA 144

Impact of temperature variation on nanoscale adhesion forces — •Mircea. V. Rastei, Maxime Kein-Wierez, and Alexandre Pinon — Institut de Physique et Chimie des Matériaux de Strasbourg, CNRS, Université de Strasbourg, F-67034 Strasbourg, France

Nanoscale adhesion is a key parameter in formation and stability of many nanomaterials. Without forming chemical bonds, van der Waals interactions induce an attractive potential which establish an equilibrium bond distance between two close contacting bodies. Here, we present a combined atomic force microscopy and theoretical study on how temperature influences the adhesion force triggered by van de Waals interactions. Similar to the case of atomic-scale lateral friction forces [1,2], we found that adhesion follows a distribution whose density function is an asymmetric bell-shaped curve. By increasing temperature the asymmetry increases whereas the most probable adhesion force value decreases. We checked various forms of interaction potentials within the reaction rate theory and evaluate several parameters governing adhesion at the nanoscale. [1] Y. Sang, M. Dubé, and M. Grant, Phys. Rev. Lett. 87, 174301 (2001). [2] A. Schirmeisen, L. Jansen, and H. Fuchs, Phys. Rev. B 71, 245403 (2005).