A gold-gold oil microtrench electrode for liquid-liquid anion transfer voltammetry.
Electrophoresis
; 34(14): 1979-84, 2013 Jul.
Article
en En
| MEDLINE
| ID: mdl-23670733
ABSTRACT
Two flat gold electrodes are placed vis-à-vis with an epoxy spacer layer that is etched out to give a ca. 100 µm-deep electrochemically active trench. A water-insoluble oil phase, here the redox system N,N-diethyl-N'N'-didodecyl-phenylenediamine (DDPD) in 4-(3-phenylpropyl)-pyridine (PPP), is immobilized into the trench to allow anion transfer upon oxidation of DDPD (oil) to DDP⺠(oil). In "mono-potentiostatic mode" quantitative transfer/expulsion of anions into the trench oil phase occurs. However, in "bi-potentiostatic mode" feedback currents dominated by rapid plate-to-plate diffusion normal to the electrode surfaces are observed. Comparison of "normal" diffusion and "lateral" diffusion shows that the rate of diffusion-migration charge transport across the oil film is anion hydrophobicity dependent.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Fenilendiaminas
/
Piridinas
/
Aceites
/
Técnicas Electroquímicas
/
Oro
Idioma:
En
Revista:
Electrophoresis
Año:
2013
Tipo del documento:
Article
País de afiliación:
Reino Unido