TY - JOUR
T1 - A new gateway to ecofriendly self-healing amorphous carbon tribofilms from ancient oils
AU - Rouhani, Mehdi
AU - Hobley, Jonathan
AU - Ou, Hsin Hung
AU - Lee, Jian Ting
AU - Metla, Sai Bhavani Sravan
AU - Jeng, Yeau Ren
N1 - Funding Information:
This work was financially supported by the Ministry of Science and Technology of Taiwan (MOST 108-2221-E-006-228-MY3, 109-2923-E-006-005-MY3, 111-2222-E-006-007, and 110-2124-M-006-005) and Air Force Office of Science Research (AFOSR) under contract no. FA4869- 06-1-0056 AOARD 064053. Professor Yeau-Ren Jeng would like to acknowledge the Medical Device Innovation Center (MDIC) and Intelligent Manufacturing Research Center (iMRC) from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan and AC 2 T research GmbH (AC2T) in Austria (COMET InTribology, FFG-No.872176). Professor Jonathan Hobley is grateful to NCKU90 for providing his Distinguished Visiting Scholar Position at National Cheng Kung University. Author 1 and Author 2 contributed equally to this work.
Funding Information:
This work was financially supported by the Ministry of Science and Technology of Taiwan ( MOST 107-2923-M-006-003-MY3 , 108-2221-E-006-228-MY3 , 111-2222-E-006-007 and 110-2124-M-006-005 ).
Publisher Copyright:
© 2022 The Author(s)
PY - 2022/12
Y1 - 2022/12
N2 - Ecologically friendly, vegetable-oil-based, self-generating, self-healing amorphous carbon (a-C) tribofilms were spontaneously formed on steel using no harmful additives. a-C films are desirable for manufacturing, automotive, and aerospace applications because they reduce energy costs and prevent component wear. Self-forming a-C films adhered onto steel during reactions of vegetable oils at elevated temperatures and pressures. For the first time, a chemical mechanism for tribofilm formation has been established. The initial step forms poly(triacylglyceride) on the steel surface. Next, a hydrogenated amorphous carbon network (a-C:H) forms. Then, the network dehydrogenates to form a-C. And eventually, it forms nanocrystalline graphite (ncG) just before the oil catastrophically fails. By understanding the complete reaction mechanism, it has been possible to create a-C tribofilms from vegetable oils without toxic additives and without involving mineral oils in the formulations, opening the prospect of greener lubricant technologies for the future. In addition, the vegetable oil formulations matched and often outperformed their mineral-oil-based counterparts.
AB - Ecologically friendly, vegetable-oil-based, self-generating, self-healing amorphous carbon (a-C) tribofilms were spontaneously formed on steel using no harmful additives. a-C films are desirable for manufacturing, automotive, and aerospace applications because they reduce energy costs and prevent component wear. Self-forming a-C films adhered onto steel during reactions of vegetable oils at elevated temperatures and pressures. For the first time, a chemical mechanism for tribofilm formation has been established. The initial step forms poly(triacylglyceride) on the steel surface. Next, a hydrogenated amorphous carbon network (a-C:H) forms. Then, the network dehydrogenates to form a-C. And eventually, it forms nanocrystalline graphite (ncG) just before the oil catastrophically fails. By understanding the complete reaction mechanism, it has been possible to create a-C tribofilms from vegetable oils without toxic additives and without involving mineral oils in the formulations, opening the prospect of greener lubricant technologies for the future. In addition, the vegetable oil formulations matched and often outperformed their mineral-oil-based counterparts.
UR - http://www.scopus.com/inward/record.url?scp=85136148258&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85136148258&partnerID=8YFLogxK
U2 - 10.1016/j.apmt.2022.101616
DO - 10.1016/j.apmt.2022.101616
M3 - Article
AN - SCOPUS:85136148258
SN - 2352-9407
VL - 29
JO - Applied Materials Today
JF - Applied Materials Today
M1 - 101616
ER -