Structures of Adsorbed Initial Layers of Stearic Acid at the Liquid/Solid Interface

概要

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The structures of stearic acid adsorbed initially on highly oriented pyrolytic graphite (HOPG) were examined at liquid/solid interfaces by scanning tunneling microscopy (STM). Depending on the concentrations of stearic acid in $n$-octylbenzene solutions, two structures were observed. For a saturated solution of stearic acid, the observed layer on HOPG was composed of large and stable domains under STM scanning, corresponding with the already reported structure ($\beta$-form). For low concentrations, molecular layers were also formed, but at the lowest concentration of 1.7 mM, the molecular layer became porous where an underlying layer with another structure ($\alpha$-form) was observed. It was concluded that the $\alpha$-form is the initially adsorbed layer and the second layer is formed as the $\beta$-form.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-07-15