Inorganic fullerene-like nanoparticles as new lubricant additives: A drug delivery mechanism

L. Joly-Pottuz, J. M. Martin, F. Dassenoy, C. Schuffenhauer, R. Tenne, N. Fleischer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

When dispersed in a synthetic polyalphaolefin (PAO) base oil, inorganic fullerene-like (IF-MS 2) nanoparticles of metal dichalcogenides (IF-MoS 2, IF-WS 2, IF-NbS 2) lead to a significant reduction of both friction and wear under boundary lubrication. The effect of the contact pressure on the tribological properties of IF nanoparticles is particularly interesting. Results show that the higher is the pressure, the lower is the friction coefficient. The effect of the concentration shows that, even used at a low concentration (0.1%wt), IF-MS 2 is able to decrease friction (0.05) compared to base oil only (0.08). A steady state friction coefficient of 0.04 was reached with IF-WS 2 at 1%wt in PAO. Friction-induced transformation of the IF-MS 2 nanoparticles into H-MS 2 single sheets was evidenced by High Resolution Transmission Electron Microscopy (HRTEM). Some of these superimposed sheets are found in incommensurate positions, thus possibly explaining the very low friction coefficient of 0.04 obtained with IF-WS 2. In-situ Raman spectroscopy was performed during a friction test to follow this structural modification. The lubrication mechanism of IF-MS 2 is very similar to a "drug delivery system". A very low concentration of additives is sufficient and the activation is obtained by the opening of the nested structure, like in certain micellar structures. Furthermore, no chemical reaction is required to obtain interesting properties. Thus, fullerene-like nanoparticles are active at the very beginning of the test and even at ambient and low temperature.

Original languageEnglish
Title of host publicationProceedings of the World Tribology Congress III - 2005
Pages613-614
Number of pages2
Publication statusPublished - 2005 Dec 1
Externally publishedYes
Event2005 World Tribology Congress III - Washington, D.C., United States
Duration: 2005 Sep 122005 Sep 16

Publication series

NameProceedings of the World Tribology Congress III - 2005

Other

Other2005 World Tribology Congress III
CountryUnited States
CityWashington, D.C.
Period05/9/1205/9/16

ASJC Scopus subject areas

  • Engineering(all)

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    Joly-Pottuz, L., Martin, J. M., Dassenoy, F., Schuffenhauer, C., Tenne, R., & Fleischer, N. (2005). Inorganic fullerene-like nanoparticles as new lubricant additives: A drug delivery mechanism. In Proceedings of the World Tribology Congress III - 2005 (pp. 613-614). (Proceedings of the World Tribology Congress III - 2005).