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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 74: Tribology: Surfaces and Nanostructures (joint session O/CPP)
CPP 74.4: Vortrag
Mittwoch, 18. März 2020, 15:45–16:00, GER 37
Temperature Scaling of Contact Aging Rates on Amorphous Silica Surfaces — Matthias Vorholzer1, J. Guilherme Vilhena2, Ruben Perez3, Enrico Gnecco4, •Dirk Dietzel1, and Andre Schirmeisen1 — 1Institute of Applied Physics, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany — 2Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland — 3Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — 4Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, 07742 Jena, Germany
Contact ageing is a fundamental aspect to understand dynamic sliding scenarios with alternating phases of halting and sliding. On the nanoscale, recent experiments showed, that ageing effects can be connected to the formation of interfacial bonds. In this work, we now analyze the temperature dependent bond formation dynamics of silica contacts by measuring the pre-rupture contact stiffness. Using this parameter instead of the seemingly more obvious choice of measuring static friction, we can eliminate all effects related to temperature dependent contact rupture. Our results show logarithmic contact ageing at all temperatures and reveal that the ageing can be described by a temperature dependent slope α(T) ∝ T, which is a characteristic fingerprint of thermal activation, anticipated both by analytical calculations and MD-simulation of the bond formation process.