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• W1983928533 abstract "Abstract The system of 1-octanol-β-cyclodextrin in 0.5 M HClO4 at Pt electrodeposited on an Au/quartz crystal (Pt/Au/Q) has been studied by cyclic voltammetry (CV), the electrochemical quartz crystal microbalance (EQCM) and impedance measurements. β-Cyclodextrin (β-CD), a cyclic oligomer of seven α- d -glucopyranose units, was chosen for this study because it forms an inclusion complex with primary alcohols and because of its hydrophilic exterior. Previous cycling in 1-octanol profoundly affected (“aged”) the electrodeposited Pt, as is readily seen in subsequent CVs and mass curves in 0.5 M HClO4. Since adsorbed 1-octanol and β-CD would tend to render the Pt surface hydrophobic and hydrophilic, respectively, these opposite tendencies should be detectable by the EQCM. Effectively, in a positive potential scan, 1-octanol and β-CD added at −0.22 V produced a mass decrease and increase, respectively, of aged Pt/Au/Q, owing to a decrease and increase of the amount of adsorbed water and/or ions, which was attributed to physisorption of these compounds. With freshly deposited Pt/Au/Q, 1-octanol added at open circuit produced a mass decrease over the whole potential cycle, again evidence of adsorption of a hydrophobic compound. The potential at which the aged Pt/Au/Q electrode immersed in an 1-octanol solution was held while β-CD was added to the electrolyte crucially affected the subsequent voltammogram and mass curve. If β-CD and 1-octanol were added together at −0.22 V, the current in a subsequent positive scan was the same as in 1-octanol added at −0.22 V, but the mass was higher, both at −0.22 V and over the whole positive scan. This mass increase was probably due to physisorption (since the current was unaffected) of the inclusion complex, since β-CD alone did not affect the mass at −0.22 V. On the contrary, if β-CD was added at open circuit to an electrolyte already containing 1-octanol, also added at open circuit, both the H desorption and Pt oxidation currents were lower than in 1-octanol, indicating a strong interaction of β-CD with the Pt surface, and the mass was also lower over most of the positive scan. Most probably this strong interaction of β-CD involves adsorbed residues formed in the dissociative chemisorption of 1-octanol at open circuit." @default.
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• W1983928533 date "2004-08-01" @default.
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• W1983928533 title "Cyclic voltammetric, EQCM and impedance study of the 1-octanol-β-cyclodextrin-electrodeposited platinum system in perchloric medium" @default.
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• W1983928533 doi "https://doi.org/10.1016/j.jelechem.2004.03.011" @default.
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