Adsorption of Sodium N-decylbenzenesulfonate onto Alumina: Relationships between Macro- and Microscopic Behavior
The adsorption of isomer-free sodiumn-decylbenzenesulfonate-d4onto a commercial γ-alumina sample was investigated in an aqueous solution. The prototype anionic surfactant and positively charged mineral oxide gave a characteristic sinusoidal adsorption isotherm with four discrete regions in the log equilibrium concentration-log adsorption amount plots. Deuterium NMR was applied to probe the molecular motion of the deuterated surfactant adsorbed on the surface. The results were not consistent with either the reverse orientation model or the bilayer model. An intermediate model between the two models was thus proposed for describing a partial occupation of the outer layer of the surfactant aggregates formed in a low concentration range.
K. Nagashima and F. D. Blum, "Adsorption of Sodium N-decylbenzenesulfonate onto Alumina: Relationships between Macro- and Microscopic Behavior," Journal of Colloid and Interface Science, Elsevier, Jun 1999.
The definitive version is available at https://doi.org/10.1006/jcis.1999.6202
National Science Foundation (U.S.)
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