On the Adsorption of Octanoic Acid at the Mercury/Electrolyte and Air/Water Interfaces

The adsorption of a purified solution of octanoic acid at the mercury/solution and air/water interfaces was studied. The equilibrium capacitance values were obtained by phase sensitive ac voltametry. From the concentration dependence of the capacitance and of the surface tension at 22 and 45°C, the...

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Veröffentlicht in:	Journal of colloid and interface science 1997-05, Vol.189 (2), p.229-235
Hauptverfasser:	Avranas, Antonis, Retter, Utz, Lunkenheimer, Klaus, Lohse, Heinz
Format:	Artikel
Sprache:	eng
Schlagworte:	adsorption isotherms Chemistry differential capacitance Exact sciences and technology Frumkin model of adsorption Gas-liquid interface and liquid-liquid interface General and physical chemistry octanoic acid Surface physical chemistry surface tension
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Zusammenfassung:	The adsorption of a purified solution of octanoic acid at the mercury/solution and air/water interfaces was studied. The equilibrium capacitance values were obtained by phase sensitive ac voltametry. From the concentration dependence of the capacitance and of the surface tension at 22 and 45°C, the adsorption isotherms were evaluated by applying the Frumkin isotherm. Adsorption energies, lateral interaction energies, and molecular surface areas obtained are compared for the two interfaces.
ISSN:	0021-9797 1095-7103
DOI:	10.1006/jcis.1997.4852