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A spectroscopic study of a copper surface under boundary lubrication: I. Chemisorbed stearic acid multilayers
Author(s) -
Hu ZuShao,
Wang Pu Sen,
Hsu Stephen M.
Publication year - 1995
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010070402
Subject(s) - stearic acid , chemisorption , fourier transform infrared spectroscopy , auger electron spectroscopy , copper , analytical chemistry (journal) , chemistry , infrared spectroscopy , x ray photoelectron spectroscopy , materials science , chemical engineering , organic chemistry , adsorption , physics , nuclear physics , engineering
The thickness of chemisorbed stearic acid films on copper surfaces was deduced by Fourier transform infrared (FTIR) spectroscopy and Auger electron spectroscopy (AES). The chemisorption was detected by FTIR from the carboxyl (COO) asymmetric stretching band at 1585 cm −1 . Multilayer growth was observed by monitoring the intensity increase in the asymmetric CH 2 stretching mode at 2915 cm −1 . The growth of the chemisorbed layer was found to depend on the concentration of the stearic acid/hexadecane solution. The chemisorption kinetic profile had a step‐function due to the change in the number of layers. High carbon concentration in Auger spectroscopic characterisation indicated that the surface was coated with a stearic acid film. AES depth profiling analysis supports this step‐function model and agrees well with the FTIR results.