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Dynamic effects in friction and adhesion through cooperative rupture and formation of supramolecular bonds

  • We introduce a molecular toolkit for studying the dynamics in friction and adhesion from the single molecule level to effects of multivalency. As experimental model system we use supramolecular bonds established by the inclusion of ditopic adamantane connector molecules into two surface-bound cyclodextrin molecules, attached to a tip of an atomic force microscope (AFM) and to a flat silicon surface. The rupture force of a single bond does not depend on the pulling rate, indicating that the fast complexation kinetics of adamantane and cyclodextrin are probed in thermal equilibrium. In contrast, the pull-off force for a group of supramolecular bonds depends on the unloading rate revealing a non-equilibrium situation, an effect discussed as the combined action of multivalency and cantilever inertia effects. Friction forces exhibit a stick-slip characteristic which is explained by the cooperative rupture of groups of host-guest bonds and their rebinding. No dependence of friction on the sliding velocity has been observed in the accessible range of velocities due to fast rebinding and the negligible delay of cantilever response in AFM lateral force measurements.

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Document Type:Article
Author:Johanna BlassORCiD, Marcel AlbrechtORCiD, Bianca L. Bozna, Gerhard WenzORCiD, Roland BennewitzORCiD
Parent Title (English):Nanoscale
First Page:7674
Last Page:7681
Year of first Publication:2015
Release Date:2022/08/30
Impact:07.760 (2015)
Funding Information:Volkswagen Foundation
Groups:Interaktive Oberflächen
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2015/035
Licence (German):License LogoCreative Commons - CC BY-NC - Namensnennung - Nicht kommerziell 4.0 International