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Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction

The achievement of the superlubricity regime, with a friction coefficient below 0.01, is the Holy Grail of many tribological applications, with the potential to have a remarkable impact on economic and environmental issues. Based on a combined high-resolution photoemission and soft X-ray absorption...

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Autores principales: De Barros Bouchet, Maria Isabel, Martin, Jean Michel, Avila, José, Kano, Makoto, Yoshida, Kentaro, Tsuruda, Takeshi, Bai, Shandan, Higuchi, Yuji, Ozawa, Nobuki, Kubo, Momoji, Asensio, Maria C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5388889/
https://www.ncbi.nlm.nih.gov/pubmed/28401962
http://dx.doi.org/10.1038/srep46394
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author De Barros Bouchet, Maria Isabel
Martin, Jean Michel
Avila, José
Kano, Makoto
Yoshida, Kentaro
Tsuruda, Takeshi
Bai, Shandan
Higuchi, Yuji
Ozawa, Nobuki
Kubo, Momoji
Asensio, Maria C.
author_facet De Barros Bouchet, Maria Isabel
Martin, Jean Michel
Avila, José
Kano, Makoto
Yoshida, Kentaro
Tsuruda, Takeshi
Bai, Shandan
Higuchi, Yuji
Ozawa, Nobuki
Kubo, Momoji
Asensio, Maria C.
author_sort De Barros Bouchet, Maria Isabel
collection PubMed
description The achievement of the superlubricity regime, with a friction coefficient below 0.01, is the Holy Grail of many tribological applications, with the potential to have a remarkable impact on economic and environmental issues. Based on a combined high-resolution photoemission and soft X-ray absorption study, we report that superlubricity can be realized for engineering applications in bearing steel coated with ultra-smooth tetrahedral amorphous carbon (ta-C) under oleic acid lubrication. The results show that tribochemical reactions promoted by the oil lubrication generate strong structural changes in the carbon hybridization of the ta-C hydrogen-free carbon, with initially high sp(3) content. Interestingly, the macroscopic superlow friction regime of moving mechanical assemblies coated with ta-C can be attributed to a few partially oxidized graphene-like sheets, with a thickness of not more than 1 nm, formed at the surface inside the wear scar. The sp(2) planar carbon and oxygen-derived species are the hallmark of these mesoscopic surface structures created on top of colliding asperities as a result of the tribochemical reactions induced by the oleic acid lubrication. Atomistic simulations elucidate the tribo-formation of such graphene-like structures, providing the link between the overall atomistic mechanism and the macroscopic experimental observations of green superlubricity in the investigated ta-C/oleic acid tribological systems.
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spelling pubmed-53888892017-04-14 Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction De Barros Bouchet, Maria Isabel Martin, Jean Michel Avila, José Kano, Makoto Yoshida, Kentaro Tsuruda, Takeshi Bai, Shandan Higuchi, Yuji Ozawa, Nobuki Kubo, Momoji Asensio, Maria C. Sci Rep Article The achievement of the superlubricity regime, with a friction coefficient below 0.01, is the Holy Grail of many tribological applications, with the potential to have a remarkable impact on economic and environmental issues. Based on a combined high-resolution photoemission and soft X-ray absorption study, we report that superlubricity can be realized for engineering applications in bearing steel coated with ultra-smooth tetrahedral amorphous carbon (ta-C) under oleic acid lubrication. The results show that tribochemical reactions promoted by the oil lubrication generate strong structural changes in the carbon hybridization of the ta-C hydrogen-free carbon, with initially high sp(3) content. Interestingly, the macroscopic superlow friction regime of moving mechanical assemblies coated with ta-C can be attributed to a few partially oxidized graphene-like sheets, with a thickness of not more than 1 nm, formed at the surface inside the wear scar. The sp(2) planar carbon and oxygen-derived species are the hallmark of these mesoscopic surface structures created on top of colliding asperities as a result of the tribochemical reactions induced by the oleic acid lubrication. Atomistic simulations elucidate the tribo-formation of such graphene-like structures, providing the link between the overall atomistic mechanism and the macroscopic experimental observations of green superlubricity in the investigated ta-C/oleic acid tribological systems. Nature Publishing Group 2017-04-12 /pmc/articles/PMC5388889/ /pubmed/28401962 http://dx.doi.org/10.1038/srep46394 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
De Barros Bouchet, Maria Isabel
Martin, Jean Michel
Avila, José
Kano, Makoto
Yoshida, Kentaro
Tsuruda, Takeshi
Bai, Shandan
Higuchi, Yuji
Ozawa, Nobuki
Kubo, Momoji
Asensio, Maria C.
Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction
title Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction
title_full Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction
title_fullStr Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction
title_full_unstemmed Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction
title_short Diamond-like carbon coating under oleic acid lubrication: Evidence for graphene oxide formation in superlow friction
title_sort diamond-like carbon coating under oleic acid lubrication: evidence for graphene oxide formation in superlow friction
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5388889/
https://www.ncbi.nlm.nih.gov/pubmed/28401962
http://dx.doi.org/10.1038/srep46394
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