Thin Film Rheology of Boundary Lubricating Surface Films. Part 3

摘要

The principal objective of the program is to obtain a more fundamental understanding of the chemistry and physics of thin films of liquids in contact with solid substrates and the application of this understanding to the development of more systematic methods for the solution of boundary lubrication problems encountered in modern aeropropulsion technology. The report discusses the experimental techniques for the study of order in such films. Frustrated multiple internal reflection infrared spectroscopy (FMIR) and high resolution fourier transform nuclear magnetic resonance (NMR) were applied. In the first of these techniques, the film to be studied is formed on the surface of a prism, infrared radiation is sent into the prism, is multiply reflected and a spectrum is obtained that is characteristic of the liquid near the surface of the prism. Experiments performed on hexadecane films formed on germanium prism at various polarizations of the incident radiation showed conclusively that order must be present in hexadecane films. In addition, NMR experiments were performed on 1-octadecene films. In addition to the experimental work, an improved theory of the role of van der Waals forces in monolayer lubrication was developed. (Author Modified Abstract)