Add time:07/16/2019         Source:sciencedirect.com

Infrared spectra were recorded in situ of octadecanol (A), octadecylamine (B), and OCTADECANEDIOIC ACID (cas 871-70-5) (C) adsorbed from CC14 solutions onto highly degassed silica. Adsorbed A interacted with silanols and caused a shift, ΔvOH, of the silanol band of ∼275 cm−1; the data suggest that A dimers interacted with silanols but also adsorbed without such an interaction. B interacted extensively and strongly with silanols, causing a ΔvOH ∼ 750 cm−1. Also, some B was chemisorbed. In constrast, 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 ΔvOH as criterion in considering competitive adsorption processes occurring on hydroxylated surfaces.

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