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 transm...
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| Format: | article |
| Language: | EN |
| Published: |
Japanese Society of Tribologists
2014
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| Subjects: | |
| Online Access: | https://doaj.org/article/fd6419d83a1d4a6492d8877d8987650e |
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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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