Artículos de revistas
NMR Relaxometry analysis of lubricant oils degradation
Fecha
2005-09Registro en:
Ballari, Maria de Los Milagros; Bonetto, Fernando Jose; Anoardo, Esteban; NMR Relaxometry analysis of lubricant oils degradation; IOP Publishing; Journal of Physics D: Applied Physics; 38; 19; 9-2005; 3746-3750
0022-3727
CONICET Digital
CONICET
Autor
Ballari, Maria de Los Milagros
Bonetto, Fernando Jose
Anoardo, Esteban
Resumen
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 (T −1 1 ) 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 T −1 1 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.