Infrared Spectroscopic Analysis of Sub-Monolayer Perfluoropolyether Films Based on the —[(CF2)nO]– Monomer Unit for n = 2, 3 and 4

Infrared specular reflection spectra of the TA-30, D-4OH and C4-4OH perfluoropolyether liquid films on gold substrates are simulated and studied experimentally. The simulated spectra were obtained using a classical dispersion analysis coupled with solutions of Maxwell's equations for transmissi...

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Bibliographic Details
Published inTribology Online Vol. 9; no. 2; pp. 51 - 62
Main Author Waltman, Robert J.
Format Journal Article
LanguageEnglish
Published Japanese Society of Tribologists 2014
Subjects
ab initio computational chemistry
boundary lubricants
dispersion analysis
Film thickness
Infrared spectroscopy
Maxwell's equations
Monomers
perfluoropolyethers
Reflection
Simulation
Spectra
specular reflection
Tantalum
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Summary:Infrared specular reflection spectra of the TA-30, D-4OH and C4-4OH perfluoropolyether liquid films on gold substrates are 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 the perfluoropolyethers over a wide film thickness range. Spectroscopic data are provided for TA-30, D-4OH and C4-4OH. The differences in the transverse and longitudinal optical IR spectra are discussed for off-normal reflection spectra in the thin film limit. Corrections to the IR reflection spectra for sub-monolayer coverage using effective medium theory are also discussed.
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ISSN:1881-2198
DOI:10.2474/trol.9.51