Structures of Adsorbed Initial Layers of Stearic Acid at the Liquid/Solid Interface
Autor: | Takashi Nemoto, Daisuke Takajo, Seiji Isoda |
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Rok vydání: | 2004 |
Předmět: | |
Zdroj: | Japanese Journal of Applied Physics. 43:4667 |
ISSN: | 1347-4065 0021-4922 |
Popis: | 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 (β-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 (α-form) was observed. It was concluded that the α-form is the initially adsorbed layer and the second layer is formed as the β-form. |
Databáze: | OpenAIRE |
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