http://www.cnr.it/ontology/cnr/individuo/prodotto/ID3840

Rack-and-pinion effects in molecular rolling friction (Articolo in rivista)

Type

Label

Rack-and-pinion effects in molecular rolling friction (Articolo in rivista) (literal)

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Alternative label

Braun, OM; Tosatti, E (2008)
Rack-and-pinion effects in molecular rolling friction
in Philosophical magazine letters (Print)
(literal)

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\"[Braun, Oleg M.] Natl Acad Sci Ukraine, Inst Phys, Kiev, Ukraine; [Braun, Oleg M.; Tosatti, Erio] SISSA, Int Sch Adv Studies, I-34014 Trieste, Italy; [Tosatti, Erio] Natl Simulat Ctr, INFM Democritos, CNR, Trieste, Italy; [Tosatti, Erio] Int Ctr Theoret Phys, Trieste, Italy (literal)

Titolo

Abstract

Rolling lubrication with spherical molecules working as 'nanobearings' has failed experimentally so far, without a full understanding of the physics involved and of the reasons why. Past model simulations and common sense have shown that molecules can only roll when they are not too closely packed to jam. The same type of model simulations now shows in addition that molecular rolling friction can develop deep minima once the molecule's peripheral 'pitch' can match the substrate periodicity, much as ordinary cogwheels do in a rack-and-pinion system. When the pinion-rack matching is bad, the driven molecular rolling becomes discontinuous and noisy, whence energy is dissipated and friction is large. This suggests experiments to be conducted by varying the rack-and-pinion matching. That could be pursued not only by changing molecules and substrates, but also by applying different sliding directions within the same system, or by applying pressure, to change the effective matching. (literal)

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