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Écully, France

Lahouij I.,LTDS ECL | Bucholz E.W.,University of Florida | Vacher B.,LTDS ECL | Sinnott S.B.,University of Florida | And 2 more authors.
Nanotechnology | Year: 2012

Inorganic fullerene-like (IF) nanoparticles made of metal dichalcogenides have previously been recognized to be good friction modifiers and anti-wear additives under boundary lubrication conditions. The tribological performance of these particles appears to be a result of their size, structure and morphology, along with the test conditions. However, the very small scale of the IF nanoparticles makes distinguishing the properties which affect the lubrication mechanism exceedingly difficult. In this work, a high resolution transmission electron microscope equipped with a nanoindentation holder is used to manipulate individual hollow IF-WS 2 nanoparticles and to investigate their responses to compression. Additional atomistic molecular dynamics (MD) simulations of similarly structured, individual hollow IF-MoS 2 nanoparticles are performed for compression studies between molybdenum surfaces on their major and minor axis diameters. MD simulations of these structures allows for characterization of the influence of structural orientation on the mechanical behavior and nano-sheet exfoliation of hollow-core IF nanoparticles. The experimental and theoretical results for these similar nanoparticles are qualitatively compared. © 2012 IOP Publishing Ltd. Source

Lahouij I.,LTDS ECL | Vacher B.,LTDS ECL | Martin J.-M.,LTDS ECL | Dassenoy F.,LTDS ECL
Wear | Year: 2012

In this work, we have studied the influence of the crystal structure of IF-MoS 2 nanoparticles on the lubricating properties of the fullerenes added to a synthetic base oil. In steel contacts, we highlight the better lubricating properties of poorly crystallised IF-MoS 2 nanoparticles, with many defects, compared to those of perfectly crystallised spherical particles. We explain the good lubricating properties of poorly crystallised particles by their higher ability to exfoliate and to form rapidly a tribofilm made of h-MoS 2 sheets on the surfaces compared to the perfectly crystallised particles. © 2012 Elsevier B.V. Source

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