We derive a connection between the intrinsic tribological properties and the electronic properties of a solid interface. In particular, we show that the adhesion and frictional forces are dictated by the electronic charge redistribution occurring due to the relative displacements of the two surfaces in contact. We define a figure of merit to quantify such a charge redistribution and show that simple functional relations hold for a wide series of interactions including metallic, covalent, and physical bonds. This suggests unconventional ways of measuring friction by recording the evolution of the interfacial electronic charge during sliding. Finally, we explain that the key mechanism to reduce adhesive friction is to inhibit the charge flow at the interface and provide examples of this mechanism in common lubricant additives.

Interfacial Charge Density and Its Connection to Adhesion and Frictional Forces / Wolloch, M.; Levita, G.; Restuccia, P.; Righi, M. C.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 121:2(2018), pp. N/A-N/A. [10.1103/PhysRevLett.121.026804]

Interfacial Charge Density and Its Connection to Adhesion and Frictional Forces

Wolloch, M.;Restuccia, P.;Righi, M. C.
2018

Abstract

We derive a connection between the intrinsic tribological properties and the electronic properties of a solid interface. In particular, we show that the adhesion and frictional forces are dictated by the electronic charge redistribution occurring due to the relative displacements of the two surfaces in contact. We define a figure of merit to quantify such a charge redistribution and show that simple functional relations hold for a wide series of interactions including metallic, covalent, and physical bonds. This suggests unconventional ways of measuring friction by recording the evolution of the interfacial electronic charge during sliding. Finally, we explain that the key mechanism to reduce adhesive friction is to inhibit the charge flow at the interface and provide examples of this mechanism in common lubricant additives.
2018
121
2
N/A
N/A
Interfacial Charge Density and Its Connection to Adhesion and Frictional Forces / Wolloch, M.; Levita, G.; Restuccia, P.; Righi, M. C.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 121:2(2018), pp. N/A-N/A. [10.1103/PhysRevLett.121.026804]
Wolloch, M.; Levita, G.; Restuccia, P.; Righi, M. C.
File in questo prodotto:
File Dimensione Formato  
18_PhysRevLett.pdf

Accesso riservato

Tipologia: Versione pubblicata dall'editore
Dimensione 1.49 MB
Formato Adobe PDF
1.49 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1165349
Citazioni
  • ???jsp.display-item.citation.pmc??? 9
  • Scopus 114
  • ???jsp.display-item.citation.isi??? 110
social impact