Ion transfer across the liquid|liquid interface studied with membrane-modified screen-printed electrodes

Olga S. Fedotova ,  Mikhail Y. Vagin ,  Arkady A. Karyakin 

Chemistry Department, Moscow State University, Leninskie Gory, 1-3, Moscow 119992, Russian Federation

Abstract

The interface between two immiscible liquids attracts the attention as for fundamental studies as for possible applications. Thus it can be considered as a model of a half of living cell membrane. That is why particles transfer processes, including ion transfer, across the interface have a fundamental importance in nature and in case of sensor systems development.

The main goal of present work was to research ion transfer across the interface between two liquids.

Screen-printed electrodes modified by membranes of polyvinylchloride plasticized by water-immiscible organic solvent was utilized as a disposable electrode setup with the interface between two immiscible liquids. Hydrophobic redox probe (erbium bis(tetratert-butylphthalocyaninato)) was inside membrane phase. The redox process was accompanied with the ion transfer across liquid-liquid interface. The formal potential of observed redox activity depended on nature of background electrolyte: more hydrophobic ions transfer on more less potentials that more hydrophilic ones. In present work dependence of ion transfer from nature and concentration of background electrolyte were studies. It was shown that increasing of ions concentration promotes decreasing of transfer energy.

This electrode system was used for biomolecules registration.
 

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Presentation: Poster at SMCBS'2009 International Workshop, by Olga S. Fedotova
See On-line Journal of SMCBS'2009 International Workshop

Submitted: 2009-08-31 20:02
Revised:   2009-08-31 21:00