Abstract
The surfactant layer formed on alumina by addition of lithium perfluorooctane sulfonate (LiFOS) was characterized in the water—dioxane system. Alumina exhibited a dispersion—flocculation—redispersion process by the addition of LiFOS as a result of the formation of a bilayer at low, but not high dioxane levels. The behavior was well correlated with zeta potential measurements and the amount of adsorbed LiFOS. Furthermore, fluorescence and electron spin resonance measurements indicate that the micropolarity and microviscosity of a LiFOS adsorbed layer on alumina are significantly altered on increasing the content of dioxane in solution.
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