Tribological performance investigation of a commercial engine oil incorporating reduced graphene oxide as additive

Hakan Kaleli, Selman Demirtaş, Veli Uysal, Ioannis Karnis, Minas M. Stylianakis, Spiros H. Anastasiadis, Dae Eun Kim

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated the tribological behavior of commercialized, fully synthetic engine oil upon the incorporation of reduced graphene oxide in seven different concentrations between 0.01 and 0.2 wt %. Stability of the prepared samples was assessed by turbidimetry and dynamic light scattering measurements, and their tribological properties through a reciprocating tribometer, using a steel ball on special cut steel blocks. The addition of 0.02 wt % of reduced graphene oxide led to an improvement of the tribological behavior compared to the pristine engine oil, by significantly lowering the friction coefficient by 5% in the boundary lubrication regime. Both the surfaces and the reduced graphene oxide additive were thoroughly characterized by microscopic and optical spectroscopy techniques. We also verified that a protective layer was formed between the worn surfaces, due to the presence of reduced graphene oxide. Carbon accumulation and various additive elements such as Ca, Zn, S and P were detected on the rubbing surfaces of both the ball and the block through energy-dispersive X-ray spectroscopy. Finally, it was shown that the wear scar diameter on the surface of the steel ball was lower by 3%, upon testing the engine oil sample containing reduced graphene oxide at concentration 0.02 wt %, compared to the control sample.

Original languageEnglish
Article number386
Pages (from-to)1-14
Number of pages14
JournalNanomaterials
Volume11
Issue number2
DOIs
Publication statusPublished - 2021

Bibliographical note

Funding Information:
This research was supported by the Research Fund of Research Projects Coordination Department of Yildiz Technical University. IRP Project Number: ID 3781, FBI-2019-3781.

Funding Information:
Funding: This research was supported by the Research Fund of Research Projects Coordination Department of Yildiz Technical University. IRP Project Number: ID 3781, FBI-2019-3781.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)

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