Materials Degradation and Fatigue Under Extreme Conditions SAD - A 2 8 2 9

I& ABSTRACT (Mnu/vm 290 word) As outlined in the original proposal our work deals with NMR and laser Raman scattering experiments on highly viscous liquids, including lubricants, both in bulk and confined geometries, over a wide range of pressures and temperatures. In a general sense we focus on the relationship between molecular level properties as obtained from our experiments and the macroscopic properties of the fluid studied, including fluids at the fluid-solid interface. As continuation of our systematic efforts to improve the understanding of the dynamic behavior of confined fluids we carried out NMR relaxation experiments on a number of molecular fluids including model lubricants. Of particular interest are the unique experiments dealing with pressure effects on confined liquids. As far as the development of new instrumentation is concerned we designed and fabricated NMR probes and pressure generating systems which allow measurements up to lOkbar pressures. DTIS QUALITY INSPECTED 5