Accession Number : ADA320662

Title :   Molecular Optical Probes of Tribological Chemistry Under High Pressure, Temperature and Shear.

Descriptive Note : Final rept. 1992-1995,

Corporate Author : PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY

Personal Author(s) : Ben-Amotz, Dor

PDF Url : ADA320662

Report Date : JAN 1997

Pagination or Media Count : 5

Abstract : Fundamental molecular, mechanical, and rheological variables driving tribo-chemical processes have been investigated using laser spectroscopic and theoretical modeling studies. These include the use of molecular-optical techniques to probe fluids under high pressure, temperature and shear conditions typical of those encountered in elastohydrodynamic (EHD) lubrication of bearings. In particular, Raman scattering has been used to perform simultaneous in situ measurements of fluid film thickness, temperature, viscosity, and pressure in a model bearing contact. In addition, in order to develop improved models for tribo-chemical phenomena, theoretical (computer simulation and analytical statistical mechanics) and experimental (Raman, fluorescence and picosecond pump-probe) studies have been used to quantitate the effects of high pressure and temperature on molecular rotation, vibration, solvation, isomerization and dissociation.

Descriptors :   *OPTICAL EQUIPMENT, *PROBES, *TEMPERATURE, *FLUORESCENCE, *HIGH PRESSURE, *CHEMISTRY, *SHEAR STRESSES, *FLUIDS, *MOLECULAR ROTATION, *RAMAN SPECTRA, *TRIBOLOGY, COMPUTERIZED SIMULATION, LIGHT SCATTERING, THICKNESS, SCATTERING, MECHANICAL PROPERTIES, VIBRATION, MODELS, SPECTROSCOPY, MOLECULES, ELASTIC PROPERTIES, FILMS, VARIABLES, LASER APPLICATIONS, RHEOLOGY, BEARINGS, SOLVATION, STATISTICAL MECHANICS, VISCOSITY, DISSOCIATION, HYDRODYNAMICS, LUBRICATION, ISOMERIZATION.

Subject Categories : Fluid Mechanics
      Physical Chemistry
      Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE