Tribological properties of sodium dodecyl sulfate aqueous dispersion of graphite-derived carbon materials
Abstract
The graphene oxide nanosheets (GOS) and reduced graphene oxide nanosheets (RGOS) were dispersed in 0.1 wt% anionic surfactant sodium dodecyl sulfate (SDS) aqueous solution to be functionalized with surfactant layers. The tribological properties of GOS and RGOS in 0.1 wt% SDS aqueous solution were studied using a four-ball tribometer. The RGOS and GOS at optimal concentration in SDS aqueous solution improved the anti-wear and friction reduction properties of SDS aqueous solution. GOS show better friction reduction properties than RGOS. The outstanding lubrication performance of GOS could attribute to their stable dispersion, thin laminated graphitic structure with high-lubricity and nanosize characteristics which can enter the contact area easily. Our findings provide the opportunity to use graphene-related materials for water-based lubricant applications.
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