Infrared Study of Adsorption 'in situ' at the Liquid-Solid Interface. V. Adsorption of Octadecanol, Octadecylamine, and Octadecanedioic Acid on Silica, and a Criterion for Considering Competitive Adsorption.
NEW YORK UNIV N Y DEPT OF CHEMISTRY
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Infrared spectra were recorded in situ of octadecanol A, octadecylamine B, and octadecanedioic acid C adsorbed from CCl4 solutions onto highly degassed silica. Adsorbed A interacted with silanols and caused a shift of the OH group of the silanol band. B interacted extensively and strongly with silanols and some B was chemisorbed. In contrast, C adsorption was slight and the interaction with silanols weak apparently some C polymer chains were broken. As interactions with silanols cause a perturbation of the silanol band and the extent of the perturbation is a measure of the strength of the adsorption, it may be possible to use the shift of the OH group as criterion in considering competitive adsorption processes occurring on hydroxylated surfaces. Author
- Atomic and Molecular Physics and Spectroscopy