Tribological and thermophysical properties of engine oil using oleic acid-functionalized multi-walled carbon nanotubes

Document Type

Article

Publication Date

9-2026

Abstract

This work presents the application of multi-walled carbon nanotubes as lubricant additives. CVD-synthesized MWCNTs were purified and stabilized in the lubricant through dispersing agents to prevent agglomeration. The major highlights of the findings reveal that a significant improvement in lubricant attributes is identified. A reduction in the pour point by 4.92% to − 32 °C, and thus an increase in the lubricant’s properties at low temperatures are obtained. A rise in flash and fire points was 8 and 7.83%, respectively, to 243 and 248 °C, which means higher thermal stability. Thermal conductivity improved by 7.97% to 0.149 W/m·K, while viscosity reduced by 48% to 78 mPa·s. A reduction of 38.1% in friction coefficient shows a decrease in wear resulting from engine operation. These improvements are due to the protective surface film established by CNTs, a decrease in friction, and improved heat transfer by nanomaterials.

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