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Issue 42, 2014
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Total internal reflection Raman spectroscopy of poly(alpha-olefin) oils in a lubricated contact

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Abstract

The rheology of a poly(alpha-olefin) base oil (PAO) in a sliding point contact has been investigated by total internal reflection (TIR) Raman spectroscopy. TIR Raman has the sensitivity to analyse nanometer-thick lubricant films in a tribological contact. The Raman signal generated from the sliding contact was used to determine the lubricant film thickness. The experimentally obtained film thicknesses were compared with theoretical calculations and a transition from Newtonian to non-Newtonian behaviour was observed at high shear rates. The Raman spectra showed no significant changes in the conformation of the PAO chains under the applied conditions of pressure and shear, but the polarisation dependence of the spectra revealed a preferred orientation of the hydrocarbon side chains in the shear-thinned region. Monolayers formed by a boundary lubricant, arachidic acid, dissolved in the PAO could be detected on the surfaces in the elastohydrodynamic regime.

Graphical abstract: Total internal reflection Raman spectroscopy of poly(alpha-olefin) oils in a lubricated contact

  • This article is part of the themed collection: Tribology
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Publication details

The article was received on 14 Mar 2014, accepted on 09 May 2014 and first published on 09 May 2014


Article type: Paper
DOI: 10.1039/C4RA02261K
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2014,4, 22205-22213
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    Total internal reflection Raman spectroscopy of poly(alpha-olefin) oils in a lubricated contact

    M. Praveena, K. Guha, A. Ravishankar, S. K. Biswas, C. D. Bain and V. Jayaram, RSC Adv., 2014, 4, 22205
    DOI: 10.1039/C4RA02261K

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