A comparison of tribological properties of nanolubricants containing carbon nanotori and additional additives

Estefany Tovar Sifuentes, Oxana V. Kharissova, Demófilo Maldonado-Cortés, Laura Peña-Parás, Remigiusz Michalczewski, Boris I. Kharisov*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


This work presents the effects of five inorganic nanoparticles as additives, i.e., CNp (carbon nanotori particles), TiO2, MoS2, MoO3, and HcNT (halloysite clay nanotubes), in three different lubricants (oil-based, grease, and water-based). Nanolubricants were prepared by adding 1 wt% particles into each type of lubricant. Tribological properties of nanolubricants were determined and compared under anti-wear (AW) and extreme pressure (EP) conditions. CNp showed a decrease in coefficient of friction (COF) by 22% when added to water-based lubricant. Additionally, CNp demonstrated an improvement in limiting pressure of seizure (poz) of 74%, 52%, and 1621% for oil-based lubricant, grease, and water-based lubricant, respectively. Comparing 1 wt% CNp added to water-based lubricant with oil-based lubricant and grease, the improvements become outstanding under EP conditions. An increase in poz by 2479% compared to oil-based lubricant, and 789% compared to grease, was observed. In addition, a decrease of 66–69% in average wear scar diameter (AWSD) was obtained in comparison to oil-based lubricant and grease. Tribological mechanisms of carbon nanotori provide a rolling/sliding effect under AW conditions, and a load-bearing effect under EP conditions.

Original languageEnglish
Article number124973
JournalMaterials Chemistry and Physics
Publication statusPublished - 1 Nov 2021

Bibliographical note

Funding Information:
This work was supported by FCFM-UANL , UDEM , and ITeE-PIB . Estefany Tovar Sifuentes gratefully acknowledges Conacyt-Mexico for the scholarship.

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics


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