Infrared Spectroscopic Analysis of Sub-Monolayer Perfluoropolyether Z-Tetraol Films Used in Boundary Lubrication

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Abstract:

Infrared specular reflection spectra of Z-Tetraol on a gold substrate was simulated and studied experimentally. The simulated spectra were obtained using a classical dispersion analysis coupled with solutions of Maxwell's equations for transmission and reflection of electromagnetic radiation. The simulated spectra, which are based on a randomly oriented sample, provide excellent fits for Z-Tetraol over a wide film thickness range. Spectroscopic data are provided for the Z-Tetraol ‐(CF2O)p‐(CF2CF2O)q‐ main chain. The differences in the transverse and longitudinal optical infrared spectra are discussed for off-normal reflection spectra in the thin film limit. Corrections to the infrared reflection spectra for sub-monolayer coverage using effective medium theory are also discussed.

Keywords: Boundary lubricants; Perfluoropolyethers; Reflection infrared spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/13-07229

Affiliations: HGST/Western Digital Company, 5601 Great Oaks Parkway, San Jose, CA 95119 USA

Publication date: May 1, 2014

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