NMR relaxometry analysis of lubricant oils degradation

The present work was undertaken in order to investigate lubricant oil degradation at the molecular level. Ageing effects, as reflected on the proton spin-lattice relaxation rate dispersion, were studied in two different lubricant engine oils. The proton field cycling technique was used to scan relax...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2005-10, Vol.38 (19), p.3746-3750
Main Authors: Ballari, M, Bonetto, F, Anoardo, E
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Friction, lubrication, and wear
Materials science
Physics
Treatment of materials and its effects on microstructure and properties
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Summary:The present work was undertaken in order to investigate lubricant oil degradation at the molecular level. Ageing effects, as reflected on the proton spin-lattice relaxation rate dispersion, were studied in two different lubricant engine oils. The proton field cycling technique was used to scan relaxation of new and aged samples of monograde and multigrade oils. Relaxation dispersions were interpreted in terms of self-diffusion and molecular rotations. Our study shows that proton could be very sensitive to degradation processes, especially at low Larmor frequencies. The analysis reveals a noticeable sensitivity of the involved correlation times. The pros and cons of the technique are also discussed.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/38/19/025