Please use this identifier to cite or link to this item: doi:10.22028/D291-29273
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Title: Multivalent Adhesion and Friction Dynamics Depend on Attachment Flexibility
Author(s): Blass, Johanna
Albrecht, Marcel
Wenz, Gerhard
Guerra, Roberto
Urbakh, Michael
Bennewitz, Roland
Language: English
Title: Journal of Physical Chemistry C : Nanomaterials and Interfaces
Volume: 121
Issue: 29
Startpage: 15888
Endpage: 15896
Publisher/Platform: American Chemical Society (ACS)
Year of Publication: 2017
Publikation type: Journal Article
Abstract: Self-assembled monolayers introduce chemical functionalities to material surfaces, providing a route to tune their equilibrium and dynamical properties. We report on atomic force microscopy measurements and simulations of adhesion and friction forces caused by a macromolecular host–guest system, where the host molecules are attached to silicon oxide surfaces by means of self-assembled silane layers. Different preparation routes for the silane layers lead to different flexibility of the molecular attachment. The velocity dependencies of the work of separation and of friction vary significantly for attachments with different flexibility. Stiff attachment leads to low pull-off forces at low pulling velocity and to vanishing friction forces in the limit of low sliding velocity. Flexible attachment enhances cooperative contribution of multiple molecular bonds to adhesion and friction and causes significant friction at low sliding velocity. The latter observation can be explained by the contribution of intermittent contact aging to the friction force.
DOI of the first publication: 10.1021/acs.jpcc.7b05412
Link to this record: hdl:20.500.11880/28116
ISSN: 1932-7447
Date of registration: 17-Oct-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Physik
Professorship: NT - Keiner Professur zugeordnet
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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