Abstract
In situ sum-frequency vibrational spectra have been recorded of monolayer films adsorbed onto a planar hydrophobic surface from mixed aqueous solutions of tri-n-alkylsulfotricarballylate (tri-chain) surfactants and dodecanol. The change in composition of the film with concentration is similar for all the tri-chain surfactants investigated. At very low tri-chain concentrations the monolayer spectra arise entirely from dodecanol. As the tri-chain concentration increases, adsorbed dodecanol is gradually displaced by the tri-chain surfactant. At a concentration of one third of the tri-chain critical micelle concentration (cmc), when the dodecanol coverage is approximately two-thirds of a full monolayer, the tri-chain has the same packing density as in the absence of dodecanol. Above the cmc, only the tri-chain adsorbs significantly which is explained by the uptake of dodecanol in bulk phase micelles. The structure of the tri-chain and dodecanol surfactants in the mixed film is similar to that in the pure tri-...
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