Journal Article10.1002/LS.3010160405
Molecular dynamics studies of a lubricant system by NMR spectroscopic techniques
A. S. Sarpal,M. I. S. Sastry,Gurpreet Singh Kapur,V. Bansal,A. K. Mehta,Akhilesh Kumar Bhatnagar +5 more
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TL;DR: In this paper, the authors highlight the applications of NMR spectroscopic techniques for unravelling the unique structural features present in base oils responsible for imparting lubricant properties.
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Abstract: 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.
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TL;DR: In this article, the authors measured the traction and film-forming properties of a wide range of base oil types at realistic engine oil temperatures in order to both explore the extent of this correlation and to determine the dependence of EHD lubricant properties on base oil compositions.
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Hydrocarbon characterization of hydrocracked base stocks by one- and two-dimensional n.m.r. spectroscopy
A. S. Sarpal,Gurpreet Singh Kapur,Anju Chopra,S. K. Jain,S. P. Srivastava,Akhilesh Kumar Bhatnagar +5 more
TL;DR: In this article, a number of unconventional catalytically hydrogenated base stocks of low aromatic content and high viscosity index is discussed in terms of hydrocarbon types, with emphasis on isoparaffinic structural analysis.
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The influence of molecular structure on the frictional behaviour of lubricating fluids
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