Table of Contents
ISRN Tribology
Volume 2013, Article ID 425809, 9 pages
http://dx.doi.org/10.5402/2013/425809
Research Article

Graphene Oxide Nanosheets as Effective Friction Modifier for Oil Lubricant: Materials, Methods, and Tribological Results

1Department of Industrial Engineering, University of Salerno, 84084 Fisciano, Salerno, Italy
2NANO_MATES Research Centre, University of Salerno, 84084 Fisciano, Salerno, Italy

Received 31 December 2012; Accepted 20 January 2013

Academic Editors: J. Antunes, J. H. Jang, Y. Lu, J. Mao, and P. Sahoo

Copyright © 2013 Adolfo Senatore et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The tribological behaviour of graphene oxide nanosheets in mineral oil was investigated under a wide spectrum of conditions, from boundary and mixed lubrication to elastohydrodynamic regimes. A ball-on-disc setup tribometer has been used to verify the friction reduction due to nanosheets prepared by a modified Hummers method and dispersed in mineral oil. Their good friction and antiwear properties may possibly be attributed to their small structure and extremely thin laminated structure, which offer lower shear stress and prevent interaction between metal interfaces. Furthermore, the results clearly prove that graphene platelets in oil easily form protective film to prevent the direct contact between steel surfaces and, thereby, improve the frictional behaviour of the base oil. This evidence is also related to the frictional coefficient trend in boundary regime.