Friction of Diamond in the Presence of Water Vapor and Hydrogen Gas. Coupling Gas-Phase Lubrication and First-Principles Studies (Articolo in rivista)

Type
Label
  • Friction of Diamond in the Presence of Water Vapor and Hydrogen Gas. Coupling Gas-Phase Lubrication and First-Principles Studies (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp211322s (literal)
Alternative label
  • Bouchet, MID; Zilibotti, G; Matta, C; Righi, MC; Vandenbulcke, L; Vacher, B; Martin, JM (2012)
    Friction of Diamond in the Presence of Water Vapor and Hydrogen Gas. Coupling Gas-Phase Lubrication and First-Principles Studies
    in Journal of physical chemistry. C
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Bouchet, MID; Zilibotti, G; Matta, C; Righi, MC; Vandenbulcke, L; Vacher, B; Martin, JM (literal)
Pagina inizio
  • 6966 (literal)
Pagina fine
  • 6972 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 116 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Ecole Cent Lyon, LTDS, F-69134 Ecully, France Univ Modena & Reggio Emilia, Dipartimento Fis, CNR Ist Nanosci Ctr S3, I-41100 Modena, Italy Inst Combust Aerotherm Reactivite & Environm, F-45071 Orleans, France (literal)
Titolo
  • Friction of Diamond in the Presence of Water Vapor and Hydrogen Gas. Coupling Gas-Phase Lubrication and First-Principles Studies (literal)
Abstract
  • Nanocrystalline diamond (NCD) has attracted much attention in recent years because of improvements in growth methodologies that have provided increases in both film thickness and growth rate, while preserving the outstanding mechanical properties of diamond material. We provide here some evidence, based on combined experimental and first-principles analyses, that ultralow friction of nanocrystalline diamond in the presence of water vapor is associated with OH and H passivation of sliding surfaces, resulting from the dissociative adsorption of H2O molecules. The presence of these adsorbates (OH and H fragments) keeps the surfaces far apart preventing the formation of covalent bonds across the interface. H-passivated surfaces, resulting from the dissociative adsorption of H-2 molecules, appears to be more efficient in further reducing friction than OH-terminated surfaces. (literal)
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