What does this research mean for the field?

Dispersing lubricating oil with graphene oxide nanoplatelets and silica nanoparticles effectively separates sliding surfaces and reduces both friction and wear in manipulator bearings under high-load, low-velocity conditions. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

The study aims to enhance the friction and wear resistance of bearings in manipulators using nanoparticle additives.

May 30, 2026Open Access

Enhancing the Tribological Properties of Bearings in Manipulators

Key Points

The study aims to enhance the friction and wear resistance of bearings in manipulators using nanoparticle additives.
Conducted experiments on lubricating oil with silica nanoparticles and graphene oxide nanoplatelets as additives.
Compared performance of nanoparticle-infused oil against traditional lubricants like ZDDP and MoS2.
Measured friction coefficients and wear resistance under varying loading conditions.
Silica nanoparticles and graphene oxide significantly reduced friction coefficient and wear in bearings.
Traditional additives like ZDDP and MoS2 resulted in higher friction values compared to nanoparticle additives.
Oil without additives showed the lowest friction values, which were not effective alone.

Abstract

The present work aims to enhance the friction and wear resistance of the bearings and joints in manipulator. The effect of dispersing lubricating oil by silica nanoparticles as well as graphene oxide nanoplatelets as antiwear and friction modifiers was discussed. The performance of the proposed additives was compared to that observed by the conventional ones such as zinc dialkyldithiophosphate (ZDDP), molybdenum disulphide (MoS2), graphite (C) and detergent additive (calcium sulphonate). The bearings of the manipulators are suffering from high friction coefficient due to the high load and the low surface velocity. In that condition, the contact between asperities is dominating so that friction and wear increase. It is necessary to separate the two surfaces and changes the lubrication regime into full-film lubrication. The effect of dispersing lubricating oil by the tested additives to decrease friction coefficient and wear is experimentally investigated. It was found that oil free of additives displayed the lowest friction values followed by detergent additives due to the high polarity of their molecules. ZDDP, MoS2 and C displayed higher friction values.Graphene oxide nanoplatelets and silica nanoparticles were able to separate the sliding surface and consequently they decreased both friction coefficient and wear.It is recommended to disperse lubricating oil of bearing in manipulators by graphene oxide nanoplatelets and silica nanoparticles to reduce friction and wear.

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