Journal
APPLIED SURFACE SCIENCE ADVANCES
Volume 7, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsadv.2021.100201
Keywords
Friction; Isotopic effect; Phononic dissipation; Hydrogen; Deuterium; Carbon
Categories
Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior -Brasil (CAPES) [001]
- PROSUC/CAPES scholarships
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [304831/2014-0, 305253/2018-2, 304675/2015-6, 305528/2018-1, 302370/2015-3, 308567/2018-8]
- Programa de Apoio a Nucleos de Excelencia (PRONEX)
- Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS) [2019/18460-4]
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This study proposes a desorption-based model to investigate the isotopic effect on phononic dissipation during friction behavior at the nanoscale. Contradictory conclusions were reported from previous experimental and theoretical approaches. The results show that even a minor surface coverage difference of 5% can have a significant impact on friction, which is supported by molecular dynamics simulations.
Friction behavior at the nanoscale may be split into different contributions, including phononic dissipation. Despite the isotopic effect in the phononic component being previously explored, experimental and theoretical approaches determined contradictory conclusions. Here, a desorption-based model is proposed, and it is found to be consistent with previously published experimental data on hydrogenated and/or deuterated amorphous carbon films. Moreover, molecular dynamics simulations showed that a surface coverage difference as low as 5% might promote an effect on friction even greater than that observed experimentally. This happens when reactive defects are created after desorption (prompting carbon dangling bonds), reinforcing the assumption that minor surface differences may be sufficient for the effects observed, meeting both experimental and theoretical approaches in the same overall trend. Therefore, the phononic dissipation occurs, but the isotopic effect may be indirect, where the desorption rate of hydrogen and deuterium plays a role by exposing carbon dangling bonds, changing the interface of interaction and the nanoscale friction ultimately.
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