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Title: Voltammetric characterization of liquid/liquid interfaces modified with cetyl-trimethyl-ammonium bromide (CTAB)
Author: Gallegos-Covarrubias, B.
Estrada-Vargas, A.
Carreon-Gutierrez, C.A.
Barcena-Soto, M.
Casillas, N.
Issue Date: 2008
Abstract: In this paper a voltammetric study of a three-phase system modified with the surfactant CTAB in a liquid/liquid interface is presented. The three-phase system consists of a nitrobenzene microdroplet (1μL) with 0.1 M ferrocene, immobilized in a paraffin impregnated graphite electrode and immersed in a LiClO4 solution. Surfactant molecules present at the interface increase the ClO4 - ion transfer resistance at low concentrations, and the ferrocenium ion transfer at high concentrations. A current mapping of the ClO4 - ions around a nitrobenzene microdroplet using SECM is included. SECM results demonstrate that ionic transport takes place at the three-phase region, according to data published in the literature. Experimental data simulations using the finite element method qualitatively describe the system. ©The Electrochemical Society.
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