Premium
Molecular dynamics studies of a lubricant system by NMR spectroscopic techniques
Author(s) -
Sarpal A. S.,
Sastry M. I. S.,
Kapur G. S.,
Bansal V.,
Mehta A. K.,
Bhatnagar A. K.
Publication year - 2004
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010160405
Subject(s) - viscosity index , lubricant , viscosity , temperature dependence of liquid viscosity , base oil , diffusion , base (topology) , relative viscosity , thermodynamics , activation energy , chemistry , inherent viscosity , intrinsic viscosity , materials science , analytical chemistry (journal) , organic chemistry , polymer , composite material , physics , scanning electron microscope , mathematical analysis , mathematics
The present studies highlight the applications of NMR spectroscopic techniques for unravelling the unique structural features present in base oils responsible for imparting lubricant properties. The viscosity—temperature and viscosity—pressure properties of base oils of API groups I—IV, such as viscosity, viscosity index, pour point, elastohydrodynamic film thickness, and pressure—viscosity coefficient, have been correlated with the detailed hydrocarbon composition of base oils with an emphasis on the various types of methyl branched structures. Molecular dynamics parameters, such as diffusion coefficient and energy of activation, estimated from the NMR spectral studies have provided evidence of the factors responsible for the different viscosity—temperature or viscosity—pressure characteristics of base oils.