Friction mediated by redox-active supramolecular connector molecules

We report on a friction study at the nanometer scale using atomic force microscopy under electrochemical control. Friction arises from the interaction between two surfaces functionalized with cyclodextrin molecules. The interaction is mediated by connector molecules with (ferrocenylmethyl)ammonium e...

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Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1985. - 31(2015), 39 vom: 06. Okt., Seite 10708-16
1. Verfasser: Bozna, B L (VerfasserIn)
Weitere Verfasser: Blass, J, Albrecht, M, Hausen, F, Wenz, G, Bennewitz, R
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article
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520 |a We report on a friction study at the nanometer scale using atomic force microscopy under electrochemical control. Friction arises from the interaction between two surfaces functionalized with cyclodextrin molecules. The interaction is mediated by connector molecules with (ferrocenylmethyl)ammonium end groups forming supramolecular complexes with the cyclodextrin molecules. With ferrocene connector molecules in solution, the friction increases by a factor of up to 12 compared to control experiments without connector molecules. The electrochemical oxidation of ferrocene to ferrocenium causes a decrease in friction owing to the lower stability of ferrocenium-cyclodextrin complex. Upon switching between oxidative and reduction potentials, a change in friction by a factor of 1.2-1.8 is observed. Isothermal titration calorimetry reveals fast dissociation and rebinding kinetics and thus an equilibrium regime for the friction experiments 
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700 1 |a Blass, J  |e verfasserin  |4 aut 
700 1 |a Albrecht, M  |e verfasserin  |4 aut 
700 1 |a Hausen, F  |e verfasserin  |4 aut 
700 1 |a Wenz, G  |e verfasserin  |4 aut 
700 1 |a Bennewitz, R  |e verfasserin  |4 aut 
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