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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

On the physicochemical origin of nanoscale friction: the polarizability and electronegativity relationship tailoring nanotribology

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Leidens, Leonardo M. [1] ; Maia da Costa, Marcelo E. H. [2] ; Figueroa, Neileth S. [2] ; Barbieri, Rodrigo A. [3] ; Alvarez, Fernando [4] ; Michels, Alexandre F. [1] ; Figueroa, Carlos A. [1, 5]
Total Authors: 7
[1] Univ Caxias Sul UCS, Programa Posgrad Engn & Ciencia Mat PPGMAT, BR-95070560 Caxias Do Sul, RS - Brazil
[2] Pontifical Catholic Univ Rio de Janeiro PUC RIO, Dept Phys, BR-22453900 Rio De Janeiro, RJ - Brazil
[3] Univ Caxias Sul UCS, Cent Lab Microscopy LCMIC, BR-95070560 Caxias Do Sul, RS - Brazil
[4] Campinas State Univ UNICAMP, Inst Phys Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
[5] Plasmar Tecnol Ltd, BR-95030775 Caxias Do Sul, RS - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Physical Chemistry Chemical Physics; v. 23, n. 4, p. 2873-2884, JAN 28 2021.
Web of Science Citations: 0

Friction is a ubiquitous manifestation of nature, and when it is studied at the nanoscale, complex and interesting effects arise from fundamental physical and chemical surface properties. Surprisingly, and probably due to the complexity of nanofriction studies, this aspect has not been completely discussed in prior studies. To fully consider the physicochemical influence in nanoscale friction, amorphous carbon films with different amounts of hydrogen and fluorine were prepared, chemically characterized, and evaluated via lateral force microscopy. Hydrogen and fluorine were selected because although they exhibit different physicochemical properties, both contribute to frictional force reduction. Indeed, to explain the experimental behavior, it is necessary to propose a new damping constant unifying both polarizability (physical) and electronegativity (chemical) properties. The satisfactory agreement between theory and experiments may encourage and enhance deeper discussion and new experiments that take into account the chemical peculiarities of frictional behavior relating to nanoscale elastic regimes. (AU)

FAPESP's process: 19/18460-4 - Synthesis, thermo-mechanical and tribological properties of advanced multicomponent materials of high entropy
Grantee:Fernando Alvarez
Support type: Regular Research Grants