The following is an abstract for the selected article. A PDF download of the full text of this article is available here. Members may download full texts at no charge. Non-members may be charged a small fee for certain articles.
Adsorption Density Calculations from In Situ FT-IR/IRS Data at Dilute Surfactant Concentrations
Volume 43, Number 8 (Dec. 1989) Page 1456-1459
Kellar, Jon J.; Cross, W.M.; Miller, J.D.
Adsorption densities of the surfactant oleate at the surface of a fluorite crystal have been calculated from in situ FT-IR internal reflection spectroscopic (IRS) data at very low surfactant concentrations. For the first time, a complete adsorption isotherm (5 × 10−7 to 5 × 10−4 M) has been calculated from the in situ spectral data with the use of internal reflection theory. It was found that monolayer coverage occurred at very low surfactant concentrations (<10−5 M), while at higher bulk concentrations, adsorption consists of multilayers of what appears to be surface-precipitated calcium dioleate. Calculated absorption densities by this in situ method agree quite well with those found previously by more traditional experimental techniques. These results provide considerable confidence that quantitative in situ FT-IR/IRS analysis of surfactant adsorption at the surface of reactive internal reflection elements is possible.