Tailoring the Nanostructure of Graphene as Oil-Based Additive: toward Synergistic Lubrication with Amorphous Carbon Film

Title
Tailoring the Nanostructure of Graphene as Oil-Based Additive: toward Synergistic Lubrication with Amorphous Carbon Film
Authors
이광렬리 샤오웨이장 데컨슈 샤오웨이
Issue Date
2020-09
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 12-43330
Abstract
Graphene exhibits great potential as a lubricant additive to enhance the antifriction capacity of moving mechanical components in synergism with amorphous carbon (a-C) as a solid lubricant. However, it is particularly challenging for experiments to accurately examine the friction dependence on the physical nanostructure of the graphene additive and the corresponding interfacial reactions because of the inevitable complexity of the graphene structure fabricated in experiments. Here, we address this puzzle regarding the coeffect of the size and content of the graphene additive at the a-C interface using reactive molecular dynamics simulations. Results reveal that the friction-reducing behavior is more sensitive to graphene size than content. For each graphene structure, with increasing content, the friction coefficient always decreases first and then increases, while the friction behavior exhibits significant dependence on the graphene size when the graphene content is fixed. In particular, the optimized size and content of the graphene additive are suggested, in which an excellent antifriction behavior or even superlubricity can be achieved. Analysis of the friction interface indicates that with increasing graphene size, the dominated low-friction mechanism transforms from the high mobilities of the base oil and graphene additive in synergism to the passivation and graphene-induced smoothing of the friction interface. These outcomes disclose the roadmap for developing a robust solid?liquid synergy lubricating system.
URI
http://pubs.kist.re.kr/handle/201004/73128
ISSN
1944-8244
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