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Superlubricity using repulsive van der Waals forces
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.ORCID iD: 0000-0002-8935-8070
2008 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 24, no 6, 2274-2276 p.Article in journal (Refereed) Published
Abstract [en]

Using colloid probe atomic force microscopy, we show that if repulsive van der Waals forces exist between two surfaces prior to their contact then friction is essentially precluded and supersliding is achieved. The friction measurements presented here are of the same order as the lowest ever recorded friction coefficients in liquid, though they are achieved by a completely different approach. A gold sphere attached to an AFM cantilever is forced to interact with a smooth Teflon surface (templated on mica). In cyclohexane, a repulsive van der Waals force is observed that diverges at short separations. The friction coefficient associated with this system is on the order of 0.0003. When the refractive index of the liquid is changed, the force can be tuned from repulsive to attractive and adhesive. The friction coefficient increases as the Hamaker constant becomes more positive and the divergent repulsive force, which prevents solid-solid contact, gets switched off.

Place, publisher, year, edition, pages
2008. Vol. 24, no 6, 2274-2276 p.
Identifiers
URN: urn:nbn:se:kth:diva-17372DOI: 10.1021/la7036907ISI: 000253941000004Scopus ID: 2-s2.0-42149193075OAI: oai:DiVA.org:kth-17372DiVA: diva2:335416
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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